Exhibit 99.1

Contacts:   ASUR Lic. Adolfo Castro +52-55-5284-0408 acastro@asur.com.mx   Lic. David Barlow +52-55-5284-0483 dbarlow@asur.com.mx

InspIR Group Susan Borinelli +1-646-330-5907 susan@inspirgroup.com

ASUR Announces Total Passenger Traffic for September 2026

Passenger traffic increased year-on-year by 5.7% in Colombia, 3.1% in Puerto Rico, 2.6% in Brazil, 1.7% in Ecuador, and decreased by 6.1% in Costa Rica, 0.9% in Curacao and 6.1% in Mexico

Mexico City, October 7, 2026 - Grupo Aeroportuario del Sureste, S.A.B. de C.V. (NYSE: ASR; BMV: ASUR), ASUR, a leading airport operator across the Americas, today announced that total passenger traffic for September 2026 reached 8.6 million passengers, unchanged compared to September 2025. Note that September figures include the first full month of operations in Brazil, Costa Rica, Curacao and Ecuador, totaling 3.9 million passengers, following the closing of the acquisition of CPC Aeroportos.

Passenger traffic showed year-on-year increases of 5.7% in Colombia, 3.1% in Puerto Rico, 2.6% in Brazil, and 1.7% in Ecuador, offset by decreases of 6.1% in Costa Rica, 0.9% in Curacao and 6.1% in Mexico.

In Colombia, there was an increase in domestic and international traffic of 5.9% and 4.9% respectively. Brazil saw an increase in domestic passenger traffic of 2.9%, partly offset by an 11.5% decrease in international traffic. International traffic increased by 3.2% in Ecuador and declined in Costa Rica by 6.4% and in Curacao by 1.6%, while domestic traffic, increased 16.3% in Costa Rica, 0.1% in Ecuador and 8.9% in Curacao. In Puerto Rico, domestic and international traffic increased by 3.4% and 1.1% respectively. Mexico showed decreases in domestic and international traffic of 3.7% and 9.8%, respectively.

All figures in this statement reflect comparisons between the period from September 1 to September 30, 2026, and from September 1 to September 30, 2025. Transit and general aviation passengers are excluded for Mexico and Colombia, while Brazil, Costa Rica, Ecuador and Curacao exclude transit passengers.

Note: Bage, Bacacheri and Pampulha are 100% general aviation airports.

About ASUR

Grupo Aeroportuario del Sureste, S.A.B. de C.V. (ASUR) is a leading international airport operator with a diversified portfolio of 36 airport concessions across the Americas and a commercial services platform in the U.S.

ASUR operates nine airports in southeastern Mexico, including Cancún Airport, the largest tourist gateway in Mexico, the Caribbean, and Latin America; and six airports in northern Colombia, including Medellin international airport (Rionegro), the second busiest in Colombia. The Company also holds a controlling 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 acquired 100% of CPC Aeroporto's stake to operate 17 airports in Brazil, Latin America’s largest aviation market by passenger traffic, as well as one airport each in Costa Rica, Curaçao, and Ecuador.

ASUR also operates a commercial services platform in the U.S. through ASUR Airports, which partners with airports and airlines to deliver enhanced retail and passenger experiences. ASUR Airports operates at major U.S. hubs, including Los Angeles International, Chicago O’Hare, and John F. Kennedy International.

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.

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