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Cash and cash equivalents: - Restricted cash (Details) - MXN ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Nov. 17, 2022
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Disclosure of geographical areas [line items] |  |  |  |
Restricted cash and cash equivalents used for passenger facility charge authorized by FAA | $ 579,093 | $ 360,880 |  |
Mexico |  |  |  |
Disclosure of geographical areas [line items] |  |  |  |
Restricted Cash and Cash Equivalents | 0 | 94,820 |  |
Restricted Cash Under Master Development Program | 0 | 94,820 | $ 148,621 | $ 148,621
Puerto Rico (Aerostar) |  |  |  |
Disclosure of geographical areas [line items] |  |  |  |
Restricted Cash and Cash Equivalents | $ 1,464,532 | $ 1,159,700 |  |

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- Definition Amount of restricted cash and cash equivalents used for passenger facility charge authorized by FAA. + References No definition available. + Details
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Namespace Prefix: | asurb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Amount of restricted cash under master development program. + References No definition available. + Details
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Namespace Prefix: | asurb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table. + References No definition available. + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The amount of cash and cash equivalents whose use or withdrawal is restricted. [Refer: Cash and cash equivalents] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2023-01-01 -Paragraph 55 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_55&doctype=Standard -URIDate 2023-03-23 + Details
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Namespace Prefix: | ifrs-full_
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Balance Type: | debit
Period Type: | instant

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- Details
Name: | ifrs-full_GeographicalAreasAxis=country_MX
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |