ASR 6-K

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 UNDER

THE SECURITIES EXCHANGE ACT OF 1934

For the month of August 2026

GRUPO AEROPORTUARIO DEL SURESTE, S.A.B. de C.V.

(SOUTHEAST AIRPORT GROUP)

(Translation of Registrant’s Name Into English)

México

(Jurisdiction of incorporation or organization)

Bosque de Alisos No. 47A– 4th Floor

Bosques de las Lomas

05120 México, D.F.

(Address of principal executive offices)

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

(Indicate by check mark whether the registrant by furnishing the information contained in this form is also thereby furnishing the information to the Commission pursuant to Rule 12g3-2(b) under the Securities Exchange Act of 1934.)

(If “Yes” is marked, indicate below the file number assigned to the registrant in connection with Rule 12g3-2(b): 82- .)

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

Date: August 5, 2026

Exhibit99.1

Contacts<br><br> <br><br><br> <br>ASUR<br><br> <br>Lic.<br> Adolfo Castro<br><br> <br>+52-55-5284-0408<br><br> <br>[email protected]<br><br> <br><br><br> <br>Lic.<br> David Barlow<br><br> <br>+52-55-5284-0483<br><br> <br>[email protected]		InspIR Group<br><br> <br>Susan<br> Borinelli<br><br> <br>+1-646-330-5907<br><br> <br>[email protected]

ASUR Announces Total Passenger Traffic for July 2026

Passenger traffic increased year-on-year by 5.8% in Colombia and decreased by 4.0% in Mexico and 5.1% Puerto Rico

MexicoCity, August 5, 2026 - Grupo Aeroportuario del Sureste, S.A.B. de C.V. (NYSE: ASR; BMV: ASUR), ASUR, a leading international airport group with operations in Mexico, the U.S. and Colombia, today announced that total passenger traffic for July 2026 reached 6.4 million passengers, a 1.9% decrease compared to July 2025.

Passenger traffic showed a year-on-year increase of 5.8% in Colombia and decreases of 4.0% in Mexico and 5.1% in Puerto Rico. In Colombia, domestic traffic increased 7.8% and international traffic remained flat . Mexico saw domestic traffic growth of 3.6% and a decrease of 11.5% in international traffic, while Puerto Rico experienced decreases in domestic and international traffic of 5.1% and 5.0%, respectively.

All figures in this statement reflect comparisons between the period from July 1 to July 31, 2026, and from July 1 to July 31, 2025. Transit and general aviation passengers are excluded only for Mexico and Colombia.

ASUR Page 1 of 3

ASUR Page 2 of 3

About ASUR

Grupo Aeroportuario del Sureste, S.A.B. de C.V. (ASUR) is a leading international airport operator with a portfolio of concessions to operate, maintain, and develop 16 airports across the Americas. The Company operates nine airports in southeastern Mexico, including Cancún Airport, the largest tourist gateway in Mexico, the Caribbean, and Latin America; as well as six airports in northern Colombia, including Medellin international airport (Rionegro), the second busiest in Colombia.

ASUR also holds a 60% interest in Aerostar Airport Holdings, LLC, operator of Luis Muñoz Marin International Airport in San Juan, the capital of Puerto Rico, the island’s primary international gateway. San Juan Airport was the first and remains the only major airport in the U.S. to have successfully completed a public–private partnership under the FAA Pilot Program. ASUR has recently expanded into airport commercial services through ASUR US Airports, which partners with airports and airlines to deliver enhanced retail and passenger experiences. ASUR US Airports operates at major U.S. hubs, including Los Angeles International, Chicago O’Hare, and John F. Kennedy International, and has historically shown competitive performance against U.S. commercial revenue benchmarks.

Headquartered in Mexico, ASUR is listed on both the Mexican Bolsa (BMV) under the symbol ASUR, and on the NYSE in the U.S., where it trades under the symbol ASR. One ADS represents ten (10) B-series shares. For further information, visit www.asur.com.mx.

ASUR Page 3 of 3