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Leases - Carrying amounts of right-of use assets (Details)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2020
USD ($)
Dec. 31, 2020
MXN ($)
Dec. 31, 2019
MXN ($)
Dec. 31, 2018
MXN ($)
Disclosure of quantitative information about right-of-use assets [line items]        
Balance at the beginning   $ 34,128,766 $ 31,882,053  
Additions   5,253,374 6,949,684  
Disposals   (17,742)    
Foreign exchange effect   795    
Depreciation on right of use assets $ (253,098) (5,048,976) (4,702,971) $ (4,043,691)
Balance at the end $ 1,720,223 34,316,217 34,128,766 31,882,053
Flight equipment        
Disclosure of quantitative information about right-of-use assets [line items]        
Balance at the beginning   33,312,089 31,126,169  
Additions   4,876,071 6,676,492  
Disposals   (17,742)    
Depreciation on right of use assets   (4,763,928) (4,490,572)  
Balance at the end   33,406,490 33,312,089 31,126,169
Aircraft Spare engines        
Disclosure of quantitative information about right-of-use assets [line items]        
Balance at the beginning   677,198 579,696  
Additions   362,081 230,200  
Depreciation on right of use assets   (210,079) (132,698)  
Balance at the end   829,200 677,198 579,696
Land and building leases        
Disclosure of quantitative information about right-of-use assets [line items]        
Balance at the beginning   139,479 176,188  
Additions   15,222 42,992  
Foreign exchange effect   795    
Depreciation on right of use assets   (74,969) (79,701)  
Balance at the end   $ 80,527 $ 139,479 $ 176,188