UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20546

FORM 6-K

REPORTOF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16

UNDERTHE SECURITIES EXCHANGE ACT OF 1934

For the monthof August, 2025

Commission File Number: 333-221916

CorporaciónAmérica Airports S.A.

(Name of Registrant)

128, Boulevard de la Pétrusse
L-2330 Luxembourg

Tel: +35226258274

(Address of Principal ExecutiveOffice)

Indicate by check mark whether the registrant filesor will file annual reports under cover of Form 20-F or Form 40-F.

Form 20-F x     Form40-F ¨

Indicate by check mark if the registrant is submittingthe Form 6-K in paper as permitted by Regulation S-T Rule 101(b)(1): ¨

Note: Regulation S-T Rule 101(b)(1) only permitsthe submission in paper of a Form 6-K if submitted solely to provide an attached annual report to security holders.

Indicate by check mark if the registrant is submittingthe Form 6-K in paper as permitted by Regulation S-T Rule 101(b)(7): ¨

Note: Regulation S-T Rule 101(b)(7) only permitsthe submission in paper of a Form 6-K if submitted to furnish a report or other document that the registrant foreign private issuer mustfurnish and make public under the laws of the jurisdiction in which the registrant is incorporated, domiciled or legally organized (theregistrant’s “home country”), or under the rules of the home country exchange on which the registrant’s securitiesare traded, as long as the report or other document is not a press release, is not required to be and has not been distributed to theregistrant’s security holders, and, if discussing a material event, has already been the subject of a Form 6-K submission or otherCommission filing on EDGAR.

SIGNATURES

Pursuantto the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by theundersigned, thereunto duly authorized.

Date: August 20, 2025

Exhibit Index

Exhibit 99.1

CORPORACION AMERICA AIRPORTSREPORTS SECOND QUARTER 2025 RESULTS

Solid traffic performance drove double-digit revenuegrowth and Adjusted EBITDA expansion

Argentina delivered second-quarter record passengertraffic with international traffic up 18.5% YoY

Cash & Cash Equivalentsat $497 million with Net Debt to LTM Adjusted EBITDA of 1.0x

Luxembourg,August 20, 2025— Corporación América Airports S.A. (NYSE: CAAP), (“CAAP” or the “Company”)one of the leading private airport operators in the world, reported today its unaudited, consolidated results for the three and six-monthperiod ended June 30, 2025. Financial results are expressed in millions of U.S. dollars and are prepared in accordance with InternationalFinancial Reporting Standards (IFRS) as issued by the International Accounting Standards Board (“IASB”).

Commencing 3Q18, the Companybegan reporting results of its Argentinean subsidiaries applying Hyperinflation Accounting, in accordance with IFRS rule IAS 29(“IAS 29”), as detailed in Section “Hyperinflation Accounting in Argentina” on page 23.

Second Quarter 2025 Highlights

CEO Message

Commenting on the results forthe quarter Mr. Martín Eurnekian, CEO of Corporación América Airports, noted: “We delivered a strongsecond quarter, with broad-based traffic growth, double-digit increases in revenue and Adjusted EBITDA, and meaningful EBITDA marginexpansion, reflecting the strength of our diversified portfolio and disciplined execution. Total traffic increased nearly 14% year-over-year,reaching close to 21 million passengers. Argentina led the performance, reaching a second-quarter record with double-digit increasesin both international and domestic travel, supported by sustained demand recovery and multiple route additions. Brazil delivered double-digitgrowth, while Italy, Uruguay and Armenia also posted solid gains, and Ecuador remained broadly stable.

Revenues ex-IFRIC12 increasednearly 19% year-over-year, well ahead of traffic growth, driven by aeronautical revenues in line with traffic trends and continued strengthin commercial revenues. Adjusted EBITDA ex-IFRIC12 rose 23% with margin expansion of 140 basis points to 38.6%, supported by operatingleverage and disciplined cost control in key markets. Argentina, Armenia, Italy and Uruguay all posted strong EBITDA gains, as didBrazil when excluding a one-time item from 2Q24.

We continue to advance ourcommercial initiatives, aimed at growing non-aeronautical revenues and enhancing the passenger experience. In Argentina, we inauguratedthe expanded duty-free arrivals area at Ezeiza Airport in May, increasing space from 700 to 1,100 square meters. In Brazil, constructionof the shopping mall at Brasília Airport is progressing on schedule, with opening targeted for April 2026, alongside otherreal estate initiatives.

On the strategic front, ourpriority is to create long-term value through targeted investments and growth opportunities. In Argentina, we are progressing with theAA2000 concession economic re-equilibrium process, while in Italy we secured environmental approval from the Region of Tuscany for theFlorence Airport Master Plan in April, an important milestone ahead of execution. In Armenia, we are moving forward with the Capex programapprovals to expand Yerevan Airport.

On the new business front,we are waiting official resolution from the government of Montenegro and are actively pursuing opportunities in Latin America, Iraq,Angola, and M&A initiatives, among others.

Lookingahead, we expect positive traffic momentum in Argentina to continue, while strong summer seasons are anticipated in both Italy and Armenia.”

Operating & FinancialHighlights

(In millions of U.S. dollars,unless otherwise noted)

Note: Figures in historical dollars (excludingIAS29) are included for comparison purposes.

Operating & FinancialHighlights

(In millions of U.S. dollars,unless otherwise noted)

Note: Figures in historical dollars (excludingIAS29) are included for comparison purposes.

2Q25 Operating Performance

Passenger Traffic

Total passenger traffic increasedby 13.7% YoY to 20.7 million passengers, improving from the 7.3% YoY growth reported in 1Q25. Domestic traffic rose by 14.5% YoY, primarilydriven by a recovery in demand in Argentina and Brazil and, to a lesser extent, Italy. Meanwhile, international traffic increasedby 11.8% YoY, with all operating countries contributing positively, except Ecuador, with particularly strong results in Argentina, Italy,and Uruguay. Notably, Argentina accounted for over 60% of the total YoY traffic increase during the quarter.

In Argentina, passengertraffic grew by 17.3% YoY, up from the 12.5% increase recorded in 1Q25. The recovery was primarily driven by a sustained rebound in domestictraffic, which began toward the end of last year, coupled with continued growth in international travel. Domestic traffic growth acceleratedto 16.4% YoY, up from 9.0% growth in the prior quarter. JetSMART added a new Airbus A320neo in June, bringing its fleet to a total of16 aircraft, and launched several new routes including Aeroparque–Resistencia and Aeroparque–Trelew. Aerolíneas Argentinasalso resumed multiple domestic routes, including Salta–Rosario, Neuquén–Rosario, and Córdoba–Posadas.Notably, a one-day strike by Aerolíneas Argentinas workers in June weighed on domestic traffic. International passenger trafficrose by 18.5% YoY, slightly decelerating from the 21.0% increase recorded in 1Q25, supported by increased frequencies and new routesfrom carriers including JetSMART, GOL, SKY, Azul, and LATAM. Avianca began operating the Córdoba–Bogotá route withthree weekly frequencies, while Air Europa expanded its Córdoba–Madrid service from three to four weekly frequencies.

In Italy, passenger trafficrose by 9.4% YoY, driven by growth in both international and domestic traffic. International traffic, which accounted for 81% of totaltraffic, grew by 9.0% YoY, driven by increases of 13.4% at Florence Airport and 6.0% at Pisa Airport. Meanwhile, domestic passenger trafficincreased by 11.3% YoY, supported by growth of 19.9% at Pisa Airport, reflecting increased flight frequencies from Ryanair, althoughpartially offset by a decline at Florence Airport.

In Brazil, total passengertraffic increased by 15.2% YoY, reflecting improved traffic trends despite persistent challenges in the aviation sector and limited aircraftavailability in the country. Domestic traffic, which accounted for nearly 60% of total traffic, grew by 13.7% YoY, while transit passengersrose by 14.7% YoY. Notably, international traffic, which accounted for only 5% of the mix, expanded by a robust 41.2% YoY, with routesto the US reaching record highs.

In Uruguay, where airtraffic is predominantly international, total passenger traffic rose by 8.5% YoY, supported by increased activity during the Easter holidayin April. Azul Linhas Aéreas announced a new direct Montevideo–Campinas route, with five weekly flights, that began operatingin July. This new connection is expected to strengthen ties between Uruguay and Brazil, enhancing connectivity and promoting the developmentof new commercial and tourism opportunities.

In Armenia, traffic increasedby 8.2% YoY to 1.4 million passengers, driven by the introduction of new airlines and additional flight frequencies. Several carriersbegan operations at Yerevan’s Zvartnots Airport in the early months of 2025, including China Southern, Air Cairo, Salam Air, andSky Express. Additionally, Wizz Air recently announced the opening of a new base at Zvartnots Airport, deploying two aircraft and launchingeight new direct routes to Europe.

In Ecuador, where securityconcerns persist, passenger traffic declined by 0.5% YoY. International traffic fell by 1.6% YoY, mainly due to reduced operations tothe U.S., while domestic traffic increased by 1.0% YoY, although elevated airfares continued to weigh on travel demand.

Cargo Volume

Cargo volume increased by 2.2%YoY, with positive YoY contributions from all countries of operations, except Italy, Ecuador and Brazil: Armenia (+11.2%), Uruguay (+4.5%),Argentina (+2.7%), Brazil (-0.6%), Italy (-3.2%), and Ecuador (-3.4%). Argentina, Brazil, and Ecuador together accounted for almost80% of the total cargo volume in the quarter.

Aircraft Movements

Total aircraft movements increasedby 10.2% YoY, with positive YoY contributions from all countries of operations: Uruguay (+13.2%), Argentina (+12.3%), Brazil (+9.1%),Armenia (+8.9%), Italy (+7.2%), and Ecuador (+4.6%). Argentina, Brazil, and Italy accounted for more than 80% of total aircraftmovements in the quarter.

Tables with detailed passengertraffic, cargo volume and aircraft movement information for each airport can be found on page 36 of this report.

Operational Statistics: PassengerTraffic, Cargo Volume and Aircraft Movements

Review of Consolidated Results

Results for ECOGAL, which operatesthe Galapagos Airport in Ecuador, are accounted for under the equity method.

Revenues

Consolidated revenues increasedby 14.6% YoY to $476.8 million. Excluding Construction Services and the impact of IAS 29, revenues rose by 20.7% YoY to $438.5 million,outpacing the 13.7% growth in passenger traffic. This performance reflected positive contributions from all countries of operation, notablyArgentina, Armenia, Italy, and Uruguay. Both commercial and aeronautical revenue growth supported the overall increase.

The following table shows revenue performance by country.More detail on the performance of CAAP´s countries of operations can be found on page 11.

Revenuesby Segment (in US$ million)

1 Only includes Guayaquil Airport.

2 Excluding ConstructionService revenue, ‘As reported’ revenues increased 23.6% in Argentina (or 27.3% excluding IAS29), 21.5% in Armenia, 19.2%in Italy, 14.1% in Uruguay, 3.9% in Brazil and 0.8% in Ecuador.

RevenueBreakdown (in US$ million)

1 Construction Servicerevenue equals the construction or upgrade costs plus a reasonable margin.

2 Excludes ConstructionService revenue.

AeronauticalRevenues accounted for 46.8% of total revenues, increasing by 15.1% YoY to $222.9 million, or by 16.4% to $225.0 million whenexcluding the impact of IAS 29. This performance was supported by a 13.7% increase in passenger traffic and was mainly driven by growthin Argentina, with contributions from all countries of operation except Ecuador. In Argentina, aeronautical revenues grew by 20.7%, orby 23.2% excluding IAS 29, primarily reflecting an 18.5% increase in international traffic. In Armenia, Uruguay, Italy, and Brazil,aeronautical revenues rose by 14.6%, 11.1%, 10.5%, and 9.5%, respectively, in line with passenger traffic growth. In contrast, Ecuadorreported a 2.2% YoY decline in aeronautical revenues due to a slight decrease in passenger traffic during the second quarter.

Non-AeronauticalRevenues represented 53.2% of total revenues, increasing by 14.1% YoY to $253.9 million, or by 17.2% YoY to $256.5 millionwhen excluding the impact of IAS 29. Commercial revenues grew by 22.0% YoY, or by 24.4% excluding IAS 29, mainly driven by highercontributions from cargo revenues, as well as improved performance in parking facilities, VIP lounges, duty-free stores, and other passenger-relatedrevenue streams. Growth in fuel-related revenues, primarily in Armenia, also contributed to this performance. Meanwhile, Constructionservice revenue declined by 17.0% YoY, or 11.8% excluding IAS 29, reflecting lower levels of capital expenditures during the period.

Operating Costs and Expenses

In2Q25, Total costs and expenses, excluding construction service costs, increased by 16.8% YoY, or 16.4% to $299.4 million whenexcluding the impact of IAS 29. This increase, which remained below revenue growth, was mainly driven by higher Concession fees and Maintenanceexpenses, primarily in Argentina, along with increased Fuel costs in Armenia and higher Salaries and social security contributions. SG&Aexpenses also contributed to the overall costs increases.

Costof Services increased 8.7% YoY, or 8.6% to $283.8 million when excluding IAS29, mainly as a result of the following increases:

These increases were partiallyoffset by an 18.3% reduction in Construction service costs, reflecting lower capital expenditures. Excluding Construction service costs,Cost of services increased by 15.4% YoY, or 14.8% to $244.2 million when excluding the impact of IAS 29, primarily due to higher Concessionfees, Maintenance expenses, and Fuel costs.

Selling,General, and Administrative Expenses (“SG&A”) increased by 21.6% YoY to $53.3 million in 2Q25. Excluding theimpact of IAS 29, SG&A expenses rose by 21.9% to $52.9 million, largely due to higher Salaries and social security contributions,driven by inflation rates significantly outpacing currency depreciation in Argentina, along with increased Services and fees, Maintenanceexpenses, and Taxes.

Otherexpenses totaled $2.3 million in 2Q25, compared to $1.0 million in 2Q24.

Costs and Expenses (in US$ million)

Adjusted EBITDA and Adjusted EBITDA excluding ConstructionService

In 2Q25, CAAP reported AdjustedEBITDA of $171.2 million and Adjusted EBITDA ex-IFRIC 12 of $167.9 million, increasing 23.3% from $136.2 million in 2Q24. Excluding theimpact of IAS 29 in Argentina, Adjusted EBITDA ex-IFRIC 12 increased by 25.2% YoY to $168.5 million, supported by YoY increases of 38.6%in Argentina, 27.1% in Uruguay, 19.7% in Armenia, and 1.8% in Italy. These gains were partially offset by YoY declines in Ecuador andBrazil.

The Adjusted EBITDA margin ex-IFRIC12 expanded by 1.4 percentage points to 38.6%, up from 37.2% in 2Q24. Excluding the impact of IAS 29 in Argentina, the margin rose from37.0% in 2Q24 to 38.4% in 2Q25, reflecting improved profitability in Argentina and Uruguay.

Adjusted EBITDA by Segment (in US$ million)

Adjusted EBITDA Reconciliationto Income from Continuing Operations (in US$ million)

Financial Income and Loss

CAAP reported a Net financialloss of $55.1 million in 2Q25, compared to net financial income of $7.3 million in 2Q24. This result was primarily driven by foreignexchange losses in Argentina during the second quarter of this year, reflecting the impact of a higher devaluation rate relative to inflationon the net monetary liability position. This contrasts with 2Q24, when foreign exchange gains were recorded due to inflation significantlyoutpacing the devaluation rate. Had IAS 29 not been applied, CAAP would have reported a net financial loss of $81.3 million in 2Q25,compared to a loss of $62.5 million in the same period last year.

See “Use of Non-IFRS FinancialMeasures” on page 23.

Income Tax Expense

During 2Q25, the Company reportedan Income Tax Expense of $10.1 million versus an expense of $45.6 million in 2Q24. Excluding the impact of IAS 29, CAAP reportedan income tax benefit of $2.7 million in 2Q25, compared to a tax benefit of $10.7 million in the year-ago quarter.

Net Income and Net Income Attributable to Ownersof the Parent

During 2Q25, CAAP reported NetIncome of $51.5 million, compared to $54.5 million in 2Q24. The 5.5% year-over-year decrease was primarily driven by the previouslymentioned negative variation in foreign exchange results on the net monetary liability position in Argentina, which more than offsethigher operating income and lower income tax expense.

In 2Q25, the Company reportedNet Income Attributed to Owners of the Parent of $49.3 million and earnings per common share of $0.30, compared with Net IncomeAttributable to Owners of the Parent of $50.2 million in 2Q24, equivalent to earnings per common share of $0.31.

Consolidated Financial Position

As of June 30, 2025, Cashand cash equivalents totaled $496.8 million, increasing 10.7% from the $448.6 million reported as of March 31, 2025, and 13.0% fromthe $439.8 million reported as of December 31, 2024. Total liquidity, which includes cash and cash equivalents as well as othercurrent financial assets, totaled $595.2 million, up from $523.5 million as of March 31, 2025, and $525.9 million as of December 31,2024.

Total Debt at the close of 2Q25decreased 1.6%, or $18.4 million, to $1,139.7 million, from $1,158.1 million as of December 31, 2024, primarily driven by debtreductions in Argentina, Uruguay and Ecuador. A total of $834.1 million, or 73.2% of total debt is denominated in U.S. dollars,while $174.1 million, or 15.3% is denominated in Brazilian Reals, and $131.5 million, or 11.5%, is in Euros.

The Net Debt to LTM AdjustedEBITDA ratio stood at 1.0x as of June 30, 2025, down from the 1.1x recorded as of December 31, 2024. The decrease in the leverageratio was driven by lower net debt, reflecting both reduced gross debt and higher cash balances, while LTM Adjusted EBITDA remained largelyunchanged. No impairment of intangible assets was recorded over the past twelve months. As a result, the Net Debt to LTM Adjusted EBITDAratio excluding intangible assets also remained at 1.0x. As of June 30, 2025, all CAAP subsidiaries remained in compliance withtheir financial covenants.

ConsolidatedDebt Indicators (in US$ million)

1The Total Debt to EBITDA Ratio is calculated as CAAP’s interest-bearing liabilities divided by its EBITDA.

2 The Total Net Debt to EBITDA Ratio is calculatedas CAAP’s interest-bearing liabilities minus Cash & Cash Equivalents, divided by its EBITDA.

3 The Total Net Debt is calculated as Total Debtminus Cash & Cash Equivalents.

4 LTM Adjusted EBITDA as of June 30, 2025was $624.9 million.

5 LTM Adjusted EBITDA excludingimpairment of intangible assets as of June 30, 2025 was $624.9 million.

Total Debt by Segment (in US$ million)

¹Of which approximately $114.0 million remain at Toscana Aeroporti level.

²Of which approximately $244.0 million remain at ACI Airport Sudamérica SAU.

Maturity of borrowings:

¹ Theamounts disclosed in the table are undiscounted cash flows of principal and estimated interest. Variable interest rate cash flowshave been estimated using variable interest rates applicable at the end of the reporting period.

Maturityof borrowings – Breakdown by segment (in USD) as of June 30, 2025:

Cash & Cash Equivalent by Segment (in US$ million)  

¹At Inframérica Concessionaria do Aeroporto de Brasilia level.

CAPEX

During 2Q25, CAAP made capitalexpenditures of $47.9 million, a 15.9% YoY decrease from $57.0 million in 2Q24. Excluding IAS 29, capital expenditures amounted to $49.4million in the quarter, with Argentina, Uruguay and Italy accounting for 55%, 22% and 13%, respectively.

Review of Segment Results

Argentina

Startingin 3Q18, reported numbers are presented applying Hyperinflation accounting for the Company’s Argentinean subsidiaries, in accordancewith IAS 29, as explained above. The following table presents the impact from Hyperinflation accounting under the column ‘IAS 29’,while the columns indicated with “ex IAS 29” present results calculated without the impact from Hyperinflation accounting.The impact of IAS 29 is presented only for Aeropuertos Argentina (AA), the Company’s largest subsidiary in Argentina, whichaccounted for over 95% of passenger traffic, revenues and Adjusted EBITDA of the Argentina segment in 2Q25.