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Fair value measurements - Loss gain from financial instruments (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
USD ($)
$ / $
Dec. 31, 2020
MXN ($)
$ / $
Dec. 31, 2019
MXN ($)
$ / $
Dec. 31, 2018
MXN ($)
$ / $
Apr. 29, 2021
$ / $
Dec. 31, 2020
Q / $
Dec. 31, 2020
₡ / $
Dec. 31, 2020
USD ($)
Dec. 31, 2019
Q / $
Dec. 31, 2019
₡ / $
Dec. 31, 2019
USD ($)
Dec. 31, 2018
Q / $
Dec. 31, 2018
₡ / $
gain (loss) on financial instruments                          
Loss from derivatives financial instruments recognized in consolidated statements of operations   $ (1,306,557) $ (67,629) $ 455,009                  
Net (loss) gain on cash flow hedges recognized in consolidated statements of comprehensive income $ (87,609,000) $ (1,747,686) $ 263,495 $ (283,691)                  
Exchange rate 19.9487 19.9487 18.8452 19.6829 19.9785 7.8095 615.7800 19.9487 7.6988 573.4400 18.8452 7.7440 609.6100
Foreign currency forward contract                          
gain (loss) on financial instruments                          
Net (loss) gain on cash flow hedges recognized in consolidated statements of comprehensive income     $ (14,241) $ 14,241                  
Jet fuel Asian call options contracts                          
gain (loss) on financial instruments                          
Net (loss) gain on cash flow hedges recognized in consolidated statements of comprehensive income   $ (11,993) 11,148 (174,984)                  
Jet fuel Zero cost collars                          
gain (loss) on financial instruments                          
Net (loss) gain on cash flow hedges recognized in consolidated statements of comprehensive income   (143,224) 256,515 (122,948)                  
Interest rate Cap                          
gain (loss) on financial instruments                          
Net (loss) gain on cash flow hedges recognized in consolidated statements of comprehensive income   (900) (4,023)                    
Non derivative financial instruments                          
gain (loss) on financial instruments                          
Net (loss) gain on cash flow hedges recognized in consolidated statements of comprehensive income   (1,591,569) 14,096                    
Fuel cost | Jet fuel Asian call options contracts                          
gain (loss) on financial instruments                          
Loss from derivatives financial instruments recognized in consolidated statements of operations   (20,646) (61,069) 402,493                  
Fuel cost | Jet fuel Zero cost collars                          
gain (loss) on financial instruments                          
Loss from derivatives financial instruments recognized in consolidated statements of operations   (835,884) (9,477)                    
Finance cost | Jet fuel Asian call options contracts                          
gain (loss) on financial instruments                          
Loss from derivatives financial instruments recognized in consolidated statements of operations   (12,981)                      
Finance cost | Jet fuel Zero cost collars                          
gain (loss) on financial instruments                          
Loss from derivatives financial instruments recognized in consolidated statements of operations   (435,578)                      
Finance cost | Interest rate Cap                          
gain (loss) on financial instruments                          
Loss from derivatives financial instruments recognized in consolidated statements of operations   $ (1,468) (1,282)                    
Aircraft and engine rent expenses | Foreign currency forward contract                          
gain (loss) on financial instruments                          
Loss from derivatives financial instruments recognized in consolidated statements of operations     $ 4,199 $ 52,516