UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C.  20549

FORM 6-K

REPORT OF FOREIGN PRIVATE ISSUER

Pursuant to Rule 13a-16 or 15d-16 of the

Securities Exchange Act of 1934

For the month of August 2025

Commission File Number: 001-36059

Controladora Vuela Compañía de Aviación,S.A.B. de C.V.

(Name of Registrant)

Av. Antonio Dovalí Jaime No. 70, 13 Floor,Tower B

Colonia Zedec Santa Fe

United Mexican States, Mexico City 01210

+(52) 55-5261-6400

 (Address of principal executive offices)

Indicate by check mark whetherthe registrant files or will file annual reports under cover Form 20-F or Form 40-F.

Form20-F  x                                            Form40-F  o

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

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

EXPLANATORY NOTE

On August 7, 2025, Controladora Vuela Compañía de Aviación,S.A.B. de C.V. (NYSE: VLRS) issued a press release titled “Volaris Reports July 2025 Traffic Results: Load Factor of 85%”

A copy of this press release is attached to this Form 6-K as Exhibit 99.1

SIGNATURES

Pursuant to the requirementsof the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereuntoduly authorized.

EXHIBIT INDEX

Volaris Reports July 2025Traffic Results:

Load Factor of 85%

Mexico City, Mexico, August 7, 2025– Controladora Vuela Compañía de Aviación, S.A.B. de C.V. (NYSE: VLRS and BMV: VOLAR) (“Volaris”or “the Company”), the ultra-low-cost carrier (ULCC) serving Mexico, the United States,Central and South America, reports its July 2025 preliminary traffic results.

In July, Volaris’ ASM capacity increased6.0%, while RPMs for the month remained essentialy flat. Mexican domestic RPMs declined 0.4%, while international RPMs increased 1.0%.Consolidated load factor decreased by 5.0 percentage points year-over-year to 84.9%. During the month, Volaris transported 2.8 millionpassengers.

EnriqueBeltranena, Volaris’ President and CEO, said: “The third quarteris performing in line with our expectations, and we are on track to meet our quarterly guidance. In July, our domestic network delivereda strong load factor, underscoring steady demand across Mexico. International load factor declined year-over-year, as expected, drivenby our tactical focus on prioritizing yields and ancillary revenues. This result also reflects year-over-year ASM restoration, includingthe recent addition of capacity in July, which will continue maturing throughout the second half of the year in both the U.S. and CentralAmerica. The market continues to gradually stabilize, with reduced industry capacity aligned with current passenger demand patterns.”

The information included in thisreport has not been audited and does not provide information on the Company’s future performance. Volaris’ future performancedepends on several factors. It cannot be inferred that any period’s performance or its comparison year-over-year will indicate asimilar performance in the future. Figures are rounded for convenience purposes.

Glossary

Revenue passenger miles (RPMs): Numberof seats booked by passengers multiplied by the number of miles flown.

Available seat miles (ASMs): Numberof seats available for passengers multiplied by the number of miles flown.

Load factor: RPMs dividedby ASMs and expressed as a percentage.

Passengers: The totalnumber of passengers booked on all flight segments.

InvestorRelations Contact

Ricardo Martínez/ ir@volaris.com

MediaContact

Israel Álvarez/ ialvarez@gcya.net

About Volaris

*Controladora Vuela Compañíade Aviación, S.A.B. de C.V. (“Volaris” or “the Company”) (NYSE: VLRS and BMV: VOLAR) is an ultra-low-costcarrier, with point-to-point operations, serving Mexico, the United States, Central, and South America. Volaris offers low base faresto build its market, providing quality service and extensive customer choice. Since the beginning of operations in March 2006, Volarishas increased its routes from 5 to more than 219 and its fleet from 4 to 151 aircraft. Volaris offers around 500 daily flight segmentson routes that connect 44 cities in Mexico and 29 cities in the United States, Central, and South America, with one of the youngest fleetsin Mexico. Volaris targets passengers who are visiting friends and relatives, cost-conscious business and leisure travelers in Mexico,the United States, Central, and South America. For more information, please visit ir.volaris.com. Volaris routinely posts informationthat may be important to investors on its investor relations website. The Company encourages investors and potential investors to consultthe Volaris website regularly for important information about Volaris.