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Description of the business and summary of significant accounting policies - Additional details (Details)
$ in Thousands, $ in Thousands
 1 Months Ended 12 Months Ended
Dec. 31, 2020
USD ($)
May 31, 2020
Apr. 30, 2020
Dec. 31, 2020
USD ($)
item
Dec. 31, 2020
MXN ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2019
MXN ($)
Dec. 31, 2018
MXN ($)
Dec. 31, 2017
MXN ($)
IFRS Statement [Line Items]                  
Cash and cash equivalents. $ 506,468     $ 506,468 $ 10,103,385 $ 400,025 $ 7,979,972 $ 5,862,942 $ 6,950,879
Covid [Member]                  
IFRS Statement [Line Items]                  
Maximum Reduction in Available Seat Miles   90.00% 80.00%            
Percentage of Available Seat Miles 100.00%                
Number Of Suppliers With Whom The Entity Negotiated Cost Reductions | item       360          
Savings Through Cost Reductions And Deferral Agreements With Suppliers | $ $ 200,000     $ 200,000