Passenger traffic shifts at ASUR (NYSE: ASR) in January 2026

Rhea-AI Filing Summary

Grupo Aeroportuario del Sureste (ASUR) reported that total passenger traffic for January 2026 reached 6.7 million passengers, a 3.6% increase compared to January 2025. This data covers operations in Mexico, Puerto Rico and Colombia, excluding transit and general aviation in Mexico and Colombia.

Traffic in Colombia grew strongly by 15.0%, with domestic passengers up 18.3% and international up 5.2%. Mexico traffic rose 0.9%, as a 2.5% increase in international passengers offset a 1.2% domestic decline. Puerto Rico traffic decreased 2.1%, with domestic down 2.6% and international up 1.8%.

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 February 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.)

Form 20-F x 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.)

Yes ¨ No x

(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.

Grupo Aeroportuario del Sureste, S.A.B. de C.V.
By:	/s/ ADOLFO CASTRO RIVAS
	Adolfo Castro Rivas
	Chief Executive Officer

Date: February 9, 2026

Exhibit 99.1

Contacts: ASUR Lic. Adolfo Castro +52-55-5284-0408		InspIR Group Susan Borinelli +1-646-330-5907
acastro@asur.com.mx		susan@inspirgroup.com

ASUR Announces Total Passenger Traffic for January 2026

Passenger traffic increased year-on-year by 15.0% in Colombia and 0.9% in México; decreased 2.1% in Puerto Rico

Mexico City, February 9, 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 passenger traffic for January 2026 reached a total of 6.7 million passengers, representing an increase of 3.6% compared to January 2025.

Passenger traffic showed year-on-year increases of 15.0% in Colombia and 0.9% in México, while it decreased 2.1% in Puerto Rico. Colombia's growth was driven by increases of 18.3% in domestic traffic and 5.2% in international traffic. Mexico experienced an increase of 2.5% in international traffic, while domestic traffic decreased by 1.2%. Puerto Rico saw a 1.8% increase in international traffic and a 2.6% decrease in domestic traffic.

All figures in this release reflect comparisons between January 1 to 31, 2026 and from January 1 to 31, 2025. Figures exclude transit and general aviation passengers in Mexico and Colombia.

Passenger Traffic Summary
	January		% Chg		Year to date		% Chg
	2025	2026			2024	2025
Mexico	3,714,152	3,748,437	0.9		3,714,152	3,748,437	0.9
Domestic Traffic	1,611,881	1,593,220	(1.2)		1,611,881	1,593,220	(1.2)
International Traffic	2,102,271	2,155,217	2.5		2,102,271	2,155,217	2.5
San Juan, Puerto Rico	1,216,168	1,190,578	(2.1)		1,216,168	1,190,578	(2.1)
Domestic Traffic	1,081,636	1,053,646	(2.6)		1,081,636	1,053,646	(2.6)
International Traffic	134,532	136,932	1.8		134,532	136,932	1.8
Colombia	1,495,926	1,719,734	15.0		1,495,926	1,719,734	15.0
Domestic Traffic	1,111,795	1,315,684	18.3		1,111,795	1,315,684	18.3
International Traffic	384,131	404,050	5.2		384,131	404,050	5.2
Total Traffic	6,426,246	6,658,749	3.6		6,426,246	6,658,749	3.6
Domestic Traffic	3,805,312	3,962,550	4.1		3,805,312	3,962,550	4.1
International Traffic	2,620,934	2,696,199	2.9		2,620,934	2,696,199	2.9

ASUR Page 1 of 3

Mexico Passenger Traffic
		January		% Chg		Year to date		% Chg
		2025	2026			2025	2026
Domestic Traffic		1,611,881	1,593,220	(1.2)		1,611,881	1,593,220	(1.2)
CUN	Cancun	813,464	743,606	(8.6)		813,464	743,606	(8.6)
CZM	Cozumel	20,079	21,411	6.6		20,079	21,411	6.6
HUX	Huatulco	57,193	54,648	(4.4)		57,193	54,648	(4.4)
MID	Merida	278,728	315,955	13.4		278,728	315,955	13.4
MTT	Minatitlan	12,697	11,373	(10.4)		12,697	11,373	(10.4)
OAX	Oaxaca	137,055	132,765	(3.1)		137,055	132,765	(3.1)
TAP	Tapachula	47,190	43,803	(7.2)		47,190	43,803	(7.2)
VER	Veracruz	126,840	143,015	12.8		126,840	143,015	12.8
VSA	Villahermosa	118,635	126,644	6.8		118,635	126,644	6.8
International Traffic		2,102,271	2,155,217	2.5		2,102,271	2,155,217	2.5
CUN	Cancun	1,945,595	1,988,889	2.2		1,945,595	1,988,889	2.2
CZM	Cozumel	46,539	46,550	0.0		46,539	46,550	0.0
HUX	Huatulco	26,897	30,694	14.1		26,897	30,694	14.1
MID	Merida	37,753	41,433	9.7		37,753	41,433	9.7
MTT	Minatitlan	825	848	2.8		825	848	2.8
OAX	Oaxaca	26,551	27,760	4.6		26,551	27,760	4.6
TAP	Tapachula	1,333	2,222	66.7		1,333	2,222	66.7
VER	Veracruz	13,685	13,479	(1.5)		13,685	13,479	(1.5)
VSA	Villahermosa	3,093	3,342	8.1		3,093	3,342	8.1
Traffic Total Mexico		3,714,152	3,748,437	0.9		3,714,152	3,748,437	0.9
CUN	Cancun	2,759,059	2,732,495	(1.0)		2,759,059	2,732,495	(1.0)
CZM	Cozumel	66,618	67,961	2.0		66,618	67,961	2.0
HUX	Huatulco	84,090	85,342	1.5		84,090	85,342	1.5
MID	Merida	316,481	357,388	12.9		316,481	357,388	12.9
MTT	Minatitlan	13,522	12,221	(9.6)		13,522	12,221	(9.6)
OAX	Oaxaca	163,606	160,525	(1.9)		163,606	160,525	(1.9)
TAP	Tapachula	48,523	46,025	(5.1)		48,523	46,025	(5.1)
VER	Veracruz	140,525	156,494	11.4		140,525	156,494	11.4
VSA	Villahermosa	121,728	129,986	6.8		121,728	129,986	6.8

US Passenger Traffic, San Juan Airport (LMM)
	January		% Chg		Year to date		% Chg
	2025	2026			2025	2026
SJU Total	1,216,168	1,190,578	(2.1)		1,216,168	1,190,578	(2.1)
Domestic Traffic	1,081,636	1,053,646	(2.6)		1,081,636	1,053,646	(2.6)
International Traffic	134,532	136,932	1.8		134,532	136,932	1.8

Colombia Passenger Traffic Airplan
		January		% Chg		Year to date		% Chg
		2025	2026			2025	2026
Domestic Traffic		1,111,795	1,315,684	18.3		1,111,795	1,315,684	18.3
MDE	Rionegro	830,333	1,007,953	21.4		830,333	1,007,953	21.4
EOH	Medellin	101,292	99,077	(2.2)		101,292	99,077	(2.2)
MTR	Monteria	134,917	159,326	18.1		134,917	159,326	18.1
APO	Carepa	12,303	14,750	19.9		12,303	14,750	19.9
UIB	Quibdo	27,781	31,877	14.7		27,781	31,877	14.7
CZU	Corozal	5,169	2,701	(47.7)		5,169	2,701	(47.7)
International Traffic		384,131	404,050	5.2		384,131	404,050	5.2
MDE	Rionegro	384,131	404,050	5.2		384,131	404,050	5.2
EOH	Medellin
MTR	Monteria	-	-			-	-
APO	Carepa	-	-			-	-
UIB	Quibdo	-	-			-	-
CZU	Corozal	-	-			-	-
Traffic Total Colombia		1,495,926	1,719,734	15.0		1,495,926	1,719,734	15.0
MDE	Rionegro	1,214,464	1,412,003	16.3		1,214,464	1,412,003	16.3
EOH	Medellin	101,292	99,077	(2.2)		101,292	99,077	(2.2)
MTR	Monteria	134,917	159,326	18.1		134,917	159,326	18.1
APO	Carepa	12,303	14,750	19.9		12,303	14,750	19.9
UIB	Quibdo	27,781	31,877	14.7		27,781	31,877	14.7
CZU	Corozal	5,169	2,701	(47.7)		5,169	2,701	(47.7)

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 southeast of 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, which partners with airports and airlines to deliver enhanced retail and passenger experiences. ASUR US operates at major U.S. hubs, including Los Angeles International, Chicago O’Hare, and John F. Kennedy International, and has a track record of outperforming 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.

- END -

ASUR Page 3 of 3

FAQ

How did ASR’s total passenger traffic change in January 2026?

ASUR’s total passenger traffic reached 6.7 million in January 2026, a 3.6% increase versus January 2025. The growth came from higher volumes in Colombia and modest gains in Mexico, partially offset by lower traffic in Puerto Rico.

What were ASR’s Mexico passenger traffic trends in January 2026?

In Mexico, passenger traffic grew 0.9% year-on-year to 3,748,437 passengers in January 2026. International traffic rose 2.5% to 2,155,217 passengers, while domestic traffic declined 1.2% to 1,593,220 passengers across airports including Cancún, Mérida, Veracruz and others.

How did ASR’s Colombia operations perform in January 2026?

Colombia passenger traffic for ASUR increased 15.0% year-on-year to 1,719,734 passengers in January 2026. Domestic traffic rose 18.3% to 1,315,684, and international traffic increased 5.2% to 404,050, led mainly by strong growth at Rionegro (MDE) airport.

What happened to passenger traffic in Puerto Rico for ASR in January 2026?

At San Juan airport in Puerto Rico, total passenger traffic fell 2.1% to 1,190,578 in January 2026. Domestic passengers declined 2.6% to 1,053,646, while international passengers increased 1.8% to 136,932 over the same period of the prior year.

How did domestic versus international traffic evolve overall for ASR?

Across all regions, ASUR’s domestic traffic increased 4.1% to 3,962,550 passengers in January 2026. International traffic rose 2.9% to 2,696,199 passengers, together driving a 3.6% increase in total passenger volumes compared with January 2025.

Which ASR markets showed the strongest passenger growth in January 2026?

ASUR’s strongest passenger growth came from Colombia, where traffic rose 15.0% year-on-year, driven by Rionegro and Monteria airports. Mexico saw modest 0.9% growth, while Puerto Rico’s San Juan airport experienced a 2.1% decline in total passenger traffic.

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