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Leases - Carrying amounts of right-of use assets (Details)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2019
USD ($)
Dec. 31, 2019
MXN ($)
Dec. 31, 2018
MXN ($)
Dec. 31, 2017
MXN ($)
Disclosure of quantitative information about right-of-use assets [line items]        
Balance at the beginning   $ 31,882,053 $ 24,893,882 $ 23,500,081
Additions   6,949,684 11,031,862 4,831,704
Depreciation on right of use assets $ (249,558) (4,702,971) (4,043,691) (3,437,903)
Balance at the end $ 1,811,006 34,128,766 31,882,053 24,893,882
Flight equipment        
Disclosure of quantitative information about right-of-use assets [line items]        
Balance at the beginning   31,126,169 24,406,960 23,047,879
Additions   6,676,492 10,585,188 4,665,330
Depreciation on right of use assets   (4,490,572) (3,865,979) (3,306,249)
Balance at the end   33,312,089 31,126,169 24,406,960
Aircraft spare engines        
Disclosure of quantitative information about right-of-use assets [line items]        
Balance at the beginning   579,696 300,029 220,554
Additions   230,200 387,480 157,225
Depreciation on right of use assets   (132,698) (107,813) (77,750)
Balance at the end   677,198 579,696 300,029
Land and buildings        
Disclosure of quantitative information about right-of-use assets [line items]        
Balance at the beginning   176,188 186,893 231,648
Additions   42,992 59,194 9,149
Depreciation on right of use assets   (79,701) (69,899) (53,904)
Balance at the end   $ 139,479 $ 176,188 $ 186,893