Southeast Airport Group October traffic falls 0.9%

Q: How many passengers did ASR handle in October 2026?

ASR recorded 9,282,453 passengers in October 2026, down 0.9% from October 2025. Domestic traffic rose 0.4% to 6,785,493, while international traffic fell 4.4% to 2,496,960.

Q: Which ASR markets had passenger growth in October 2026?

October 2026 traffic increased by 4.8% in Puerto Rico, 2.8% in Colombia, 0.9% in Brazil and 0.2% in Ecuador. Those gains were offset by decreases of 5.4% in Mexico, 6.6% in Costa Rica and 3.5% in Curazao.

Year-over-year October gains in Puerto Rico and Colombia were offset by lower passenger traffic in Mexico, Costa Rica and Curazao.

Available on EDGAR 11/05/2026 - 04:42 PM EST Accepted by SEC EDGAR 11/05/2026 - 04:42 PM EST

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6-K

Rhea-AI Filing Summary

Southeast Airport Group (ASR) reported 9,282,453 passengers in October 2026, down 0.9% from October 2025. Domestic traffic was 6,785,493, up 0.4%, while international traffic was 2,496,960, down 4.4%. Year-to-date 2026 traffic totaled 66,433,574 passengers, down 0.7% from 2025.

October traffic increased in Puerto Rico (4.8%), Colombia (2.8%), Brazil (0.9%) and Ecuador (0.2%); declines in Mexico (5.4%), Costa Rica (6.6%) and Curazao (3.5%) offset those gains. Mexico handled 2,801,399 passengers, while Puerto Rico handled 897,121 and Colombia 1,546,129. At San Juan, domestic traffic rose 6.2% and international traffic declined 3.0%; in Mexico, domestic and international traffic fell 3.7% and 7.6%, respectively. These comparisons are year over year for October. Passengers in transit and general aviation are excluded for Mexico, Colombia, Brazil, Costa Rica, Ecuador and Curazao only.

Key Figures

Total passenger traffic: 9,282,453 passengers; down 0.9% Domestic traffic: 6,785,493 passengers; up 0.4% International traffic: 2,496,960 passengers; down 4.4% +4 more

7 metrics

Total passenger traffic 9,282,453 passengers; down 0.9% October 2026 compared with October 2025

Domestic traffic 6,785,493 passengers; up 0.4% October 2026 compared with October 2025

International traffic 2,496,960 passengers; down 4.4% October 2026 compared with October 2025

Year-to-date total traffic 66,433,574 passengers; down 0.7% 2026 compared with 2025

Mexico passenger traffic 2,801,399 passengers; down 5.4% October 2026 compared with October 2025

Colombia passenger traffic 1,546,129 passengers; up 2.8% October 2026 compared with October 2025

San Juan, Puerto Rico passenger traffic 897,121 passengers; up 4.8% October 2026 compared with October 2025

Key Terms

passengers in transit, general aviation, airport concessions, ADS

4 terms

passengers in transit technical

"Passengers in transit and general aviation are excluded"

general aviation technical

"Passengers in transit and general aviation are excluded"

General aviation covers all civil flying that isn’t part of scheduled airline service or military operations — think private planes, business jets, air taxis, flight schools, medical flights and aerial work like surveying or crop spraying. For investors, it signals demand for aircraft makers, maintenance firms, airports and fuel suppliers the way private cars indicate consumer mobility: stronger activity can boost sales and services, while regulation, safety or fuel costs can affect profitability.

airport concessions technical

"diversified portfolio of 36 airport concessions"

ADS financial

"One ADS represents ten (10) B-series shares"

Ads are paid promotional messages a company places across media — online, on TV, in print, or on social platforms — to attract customers, explain products, or shape public perception. For investors, ads matter because they drive sales growth, affect how much a company must spend to win customers, and influence brand strength and long-term value. Ads can also create regulatory or reputational risk if claims are misleading, which can affect profits and stock price.

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

How many passengers did ASR handle in October 2026?

ASR recorded 9,282,453 passengers in October 2026, down 0.9% from October 2025. Domestic traffic rose 0.4% to 6,785,493, while international traffic fell 4.4% to 2,496,960.

Which ASR markets had passenger growth in October 2026?

October 2026 traffic increased by 4.8% in Puerto Rico, 2.8% in Colombia, 0.9% in Brazil and 0.2% in Ecuador. Those gains were offset by decreases of 5.4% in Mexico, 6.6% in Costa Rica and 3.5% in Curazao.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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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 November 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: November 5, 2026

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 October 2026

Passenger traffic increased year on year by 4.8% in Puerto Rico, 2.8% in Colombia, 0.9% in Brazil, and 0.2% in Ecuador, offset by decreases of 5.4% in Mexico, 6.6% Costa Rica, and 3.5% in Curazao

Mexico City, November 5, 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 October 2026 reached 9.3 million passengers, a decline of 0.9% compared to October 2025.

In Colombia, domestic and international traffic increased 1.8% and 6.2%, respectively. In Puerto Rico, a 6.2% increase in domestic traffic was partially offset by a 3.0% decrease in international traffic. Brazil experienced a 1.0% increase in domestic passenger traffic, partially offset by a 3.5% decrease in international traffic. In Ecuador, a 5.9% increase in international traffic was practically offset by a 4.9% decline in domestic traffic.

Mexico experienced decreases in domestic and international traffic of 3.7% and 7.6%, respectively. In Costa Rica, a 6.9% increase in domestic passengers was more than offset by a 6.8% decrease in international traffic , while in Curazao, domestic traffic increased 16.8% while international traffic decreased 9.1%.

All figures in this statement reflect comparisons between the period from October 1 to 31, 2026, and from October 1 to 31, 2025. Passengers in transit and general aviation are excluded for Mexico and Colombia, Brazil, Costa Rica, Ecuador, and Curazao only.

Passenger Traffic Summary
	October		*% Chg*	Year to date		*% Chg*
	2025	2026	*% Chg*	2025	2026	*% Chg*
Mexico	2,962,147	2,801,399	(5.4)	33,443,544	32,335,518	(3.3)
Domestic Traffic	1,657,685	1,596,543	(3.7)	16,336,251	16,235,737	(0.6)
International Traffic	1,304,462	1,204,856	(7.6)	17,107,293	16,099,781	(5.9)
Brazil and Others	4,045,244	4,037,804	(0.2)	7,917,576	7,962,774	0.6
Domestic Traffic	3,200,709	3,224,673	0.7	6,189,422	6,296,380	1.7
International Traffic	844,535	813,131	(3.7)	1,728,154	1,666,394	(3.6)
San Juan, Puerto Rico	855,798	897,121	4.8	11,399,130	11,129,777	(2.4)
Domestic Traffic	729,237	774,301	6.2	9,949,889	9,707,001	(2.4)
International Traffic	126,561	122,820	(3.0)	1,449,241	1,422,776	(1.8)
Colombia	1,503,803	1,546,129	2.8	14,139,199	15,005,505	6.1
Domestic Traffic	1,168,412	1,189,976	1.8	10,799,735	11,542,874	6.9
International Traffic	335,391	356,153	6.2	3,339,464	3,462,631	3.7
Total Traffic	9,366,992	9,282,453	(0.9)	66,899,449	66,433,574	(0.7)
Domestic Traffic	6,756,043	6,785,493	0.4	43,275,297	43,781,992	1.2
International Traffic	2,610,949	2,496,960	(4.4)	23,624,152	22,651,582	(4.1)

ASUR Page 1 of 4

Mexico Passenger Traffic
		October		*% Chg*	Year to date		*% Chg*
		2025	2026	*% Chg*	2025	2026	*% Chg*
Domestic Traffic		1,657,685	1,596,543	(3.7)	16,336,251	16,235,737	(0.6)
CUN	Cancun	835,494	793,337	(5.0)	8,293,484	7,896,613	(4.8)
CZM	Cozumel	22,169	21,518	(2.9)	219,320	222,811	1.6
HUX	Huatulco	50,824	49,233	(3.1)	547,373	535,591	(2.2)
MID	Merida	302,046	299,199	(0.9)	2,883,772	3,039,013	5.4
MTT	Minatitlan	11,840	11,229	(5.2)	126,128	113,167	(10.3)
OAX	Oaxaca	136,458	130,656	(4.3)	1,309,834	1,308,010	(0.1)
TAP	Tapachula	36,625	38,830	6.0	408,449	423,577	3.7
VER	Veracruz	150,540	139,916	(7.1)	1,406,548	1,479,967	5.2
VSA	Villahermosa	111,689	112,625	0.8	1,141,343	1,216,988	6.6
International Traffic		1,304,462	1,204,856	(7.6)	17,107,293	16,099,781	(5.9)
CUN	Cancun	1,215,159	1,100,099	(9.5)	15,954,026	14,879,481	(6.7)
CZM	Cozumel	19,205	18,641	(2.9)	314,572	303,852	(3.4)
HUX	Huatulco	1,877	3,162	68.5	103,254	116,282	12.6
MID	Merida	28,279	33,043	16.8	323,027	343,902	6.5
MTT	Minatitlan	527	653	23.9	6,135	7,269	18.5
OAX	Oaxaca	22,067	21,849	(1.0)	219,563	196,823	(10.4)
TAP	Tapachula	1,669	6,600	295.4	20,043	48,748	143.2
VER	Veracruz	12,604	12,639	0.3	128,014	136,428	6.6
VSA	Villahermosa	3,075	8,170	165.7	38,659	66,996	73.3
Traffic Total Mexico		2,962,147	2,801,399	(5.4)	33,443,544	32,335,518	(3.3)
CUN	Cancun	2,050,653	1,893,436	(7.7)	24,247,510	22,776,094	(6.1)
CZM	Cozumel	41,374	40,159	(2.9)	533,892	526,663	(1.4)
HUX	Huatulco	52,701	52,395	(0.6)	650,627	651,873	0.2
MID	Merida	330,325	332,242	0.6	3,206,799	3,382,915	5.5
MTT	Minatitlan	12,367	11,882	(3.9)	132,263	120,436	(8.9)
OAX	Oaxaca	158,525	152,505	(3.8)	1,529,397	1,504,833	(1.6)
TAP	Tapachula	38,294	45,430	18.6	428,492	472,325	10.2
VER	Veracruz	163,144	152,555	(6.5)	1,534,562	1,616,395	5.3
VSA	Villahermosa	114,764	120,795	5.3	1,180,002	1,283,984	8.8

ASUR Page 2 of 4

Brazil and Others Passenger Traffic
		October		*% Chg*	Year to date		*% Chg*
		2025	2026	*% Chg*	2025	2026	*% Chg*
Total Domestic Traffic		3,200,709	3,224,673	0.7	6,189,422	6,296,380	1.7
*Others*		*287,694*	*283,105*	*(1.6)*	*521,361*	*519,306*	*(0.4)*
	San Jose, Costa Rica	5,538	5,922	6.9	12,719	14,274	12.2
	Curazao	40,973	47,848	16.8	52,767	60,695	15.0
	Quito, Ecuador	241,183	229,335	(4.9)	455,875	444,337	(2.5)
*Brazil*		*2,913,015*	*2,941,568*	*1.0*	*5,668,061*	*5,777,074*	*1.9*
BHA	Belo Horizonte	1,137,801	1,151,902	1.2	2,214,493	2,228,595	0.6
PLU	Pampulha	-	-	-	-	-	-
South Block		1,057,478	1,063,738	0.6	2,025,101	2,092,782	3.3
BHF	Bacacheri	-	-	-	-	-	-
BGX	Bagé	-	-	-	-	-	-
CWB	Curitiba	519,539	500,161	(3.7)	1,019,583	988,066	(3.1)
IGU	Foz do Iguacu	201,968	244,531	21.1	380,511	475,307	24.9
JOI	Joinvile	48,334	46,131	(4.6)	94,993	88,611	(6.7)
LDB	Londrina	61,417	67,890	10.5	115,894	134,654	16.2
NVT	Navegantes	216,610	196,231	(9.4)	395,773	389,805	(1.5)
PET	Pelotas	7,550	7,475	(1.0)	14,577	14,051	(3.6)
URG	Uruguaiana	2,060	1,319	(36.0)	3,770	2,288	(39.3)
Central Block		717,736	725,928	1.1	1,428,467	1,455,697	1.9
GYN	Goiana	338,181	307,434	(9.1)	667,794	609,881	(8.7)
IMP	Imperatriz	30,096	28,254	(6.1)	60,095	55,741	(7.2)
PMW	Palmas	61,776	69,314	12.2	123,637	138,938	12.4
PNZ	Petrolina	41,559	52,874	27.2	78,143	103,679	32.7
SLZ	Sao Luis	156,268	158,146	1.2	321,202	335,686	4.5
THE	Teresina	89,856	109,906	22.3	177,596	211,772	19.2
Total International Traffic		844,535	813,131	(3.7)	1,728,154	1,666,394	(3.6)
*Others*		*784,242*	*754,940*	*(3.7)*	*1,602,902*	*1,550,740*	*(3.3)*
	San Jose, Costa Rica	419,476	391,024	(6.8)	843,436	787,700	(6.6)
	Curazao	148,376	134,823	(9.1)	321,520	305,279	(5.1)
	Quito, Ecuador	216,390	229,093	5.9	437,946	457,761	4.5
*Brazil*		*60,293*	*58,191*	*(3.5)*	*125,252*	*115,654*	*(7.7)*
BHA	Belo Horizonte	44,101	38,483	(12.7)	89,939	76,507	(14.9)
PLU	Pampulha	-	-	-	-	-	-
South Block		16,192	19,254	18.9	35,313	38,693	9.6
BHF	Bacacheri	-	-	-	-	-	-
BGX	Bagé	-	-	-	-	-	-
CWB	Curitiba	13,540	16,404	21.2	29,303	31,951	9.0
IGU	Foz do Iguacu	2,652	2,850	7.5	6,010	6,742	12.2
JOI	Joinvile	-	-	-	-	-	-
LDB	Londrina	-	-	-	-	-	-
NVT	Navegantes	-	-	-	-	-	-
PET	Pelotas	-	-	-	-	-	-
URG	Uruguaiana	-	-	-	-	-	-
Central Block		-	454	-	-	454	-
GYN	Goiana	-	-	-	-	-	-
IMP	Imperatriz	-	-	-	-	-	-
PMW	Palmas	-	-	-	-	-	-
PNZ	Petrolina	-	-	-	-	-	-
SLZ	Sao Luis	-	454	-	-	454	-
THE	Teresina	-	-	-	-	-	-
Traffic Total Brazil and Others		4,045,244	4,037,804	(0.2)	7,917,576	7,962,774	0.6
*Others*		*1,071,936*	*1,038,045*	*(3.2)*	*2,124,263*	*2,070,046*	*(2.6)*
	San Jose, Costa Rica	425,014	396,946	(6.6)	856,155	801,974	(6.3)
	Curazao	189,349	182,671	(3.5)	374,287	365,974	(2.2)
	Quito, Ecuador	457,573	458,428	0.2	893,821	902,098	0.9
*Brazil*		*2,973,308*	*2,999,759*	*0.9*	*5,793,313*	*5,892,728*	*1.7*
BHA	Belo Horizonte	1,181,902	1,190,385	0.7	2,304,432	2,305,102	0.0
PLU	Pampulha	-	-	-	-	-	-
South Block		1,073,670	1,082,992	0.9	2,060,414	2,131,475	3.4
BHF	Bacacheri	-	-	-	-	-	-
BGX	Bagé	-	-	-	-	-	-
CWB	Curitiba	533,079	516,565	(3.1)	1,048,886	1,020,017	(2.8)
IGU	Foz do Iguacu	204,620	247,381	20.9	386,521	482,049	24.7
JOI	Joinvile	48,334	46,131	(4.6)	94,993	88,611	(6.7)
LDB	Londrina	61,417	67,890	10.5	115,894	134,654	16.2
NVT	Navegantes	216,610	196,231	(9.4)	395,773	389,805	(1.5)
PET	Pelotas	7,550	7,475	(1.0)	14,577	14,051	(3.6)
URG	Uruguaiana	2,060	1,319	(36.0)	3,770	2,288	(39.3)
Central Block		717,736	726,382	1.2	1,428,467	1,456,151	1.9
GYN	Goiana	338,181	307,434	(9.1)	667,794	609,881	(8.7)
IMP	Imperatriz	30,096	28,254	(6.1)	60,095	55,741	(7.2)
PMW	Palmas	61,776	69,314	12.2	123,637	138,938	12.4
PNZ	Petrolina	41,559	52,874	27.2	78,143	103,679	32.7
SLZ	Sao Luis	156,268	158,600	1.5	321,202	336,140	4.7
THE	Teresina	89,856	109,906	22.3	177,596	211,772	19.2

ASUR Page 3 of 4

US Passenger Traffic, San Juan Airport (LMM)
	October		*% Chg*	Year to date		*% Chg*
	2025	2026	*% Chg*	2025	2026	*% Chg*
SJU Total	855,798	897,121	4.8	11,399,130	11,129,777	(2.4)
Domestic Traffic	729,237	774,301	6.2	9,949,889	9,707,001	(2.4)
International Traffic	126,561	122,820	(3.0)	1,449,241	1,422,776	(1.8)

Colombia Passenger Traffic
		October		*% Chg*	Year to date		*% Chg*
		2025	2026	*% Chg*	2025	2026	*% Chg*
Domestic Traffic		1,168,412	1,189,976	1.8	10,799,735	11,542,874	6.9
MDE	Rionegro	881,315	886,067	0.5	8,164,692	8,680,902	6.3
EOH	Medellin	106,084	113,692	7.2	995,402	1,007,583	1.2
MTR	Monteria	123,566	139,447	12.9	1,150,424	1,365,811	18.7
APO	Carepa	17,411	15,483	(11.1)	150,434	151,923	1.0
UIB	Quibdo	34,495	32,788	(4.9)	293,484	312,971	6.6
CZU	Corozal	5,541	2,499	(54.9)	45,299	23,684	(47.7)
International Traffic		335,391	356,153	6.2	3,339,464	3,462,631	3.7
MDE	Rionegro	335,391	356,153	6.2	3,339,464	3,462,536	3.7
EOH	Medellin
MTR	Monteria	-			-	95	-
APO	Carepa	-	-		-	-
UIB	Quibdo	-	-		-	-
CZU	Corozal	-	-		-	-
Traffic Total Colombia		1,503,803	1,546,129	2.8	14,139,199	15,005,505	6.1
MDE	Rionegro	1,216,706	1,242,220	2.1	11,504,156	12,143,438	5.6
EOH	Medellin	106,084	113,692	7.2	995,402	1,007,583	1.2
MTR	Monteria	123,566	139,447	12.9	1,150,424	1,365,906	18.7
APO	Carepa	17,411	15,483	(11.1)	150,434	151,923	1.0
UIB	Quibdo	34,495	32,788	(4.9)	293,484	312,971	6.6
CZU	Corozal	5,541	2,499	(54.9)	45,299	23,684	(47.7)

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, Curazao, 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.

- END -

ASUR Page 4 of 4

Source: View Original Filing on SEC EDGAR

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