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Components of other comprehensive income (loss) (Details)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2019
USD ($)
Dec. 31, 2019
MXN ($)
Dec. 31, 2018
MXN ($)
Dec. 31, 2017
MXN ($)
Derivative financial instruments:        
Reclassification of call options and forwards during the year to profit or loss (Note 4)     $ (455,009) $ 52,097
Net gain (loss) on cash flow hedges $ 13,982 $ 263,495 (283,691) (42,148)
Jet fuel Asian call options        
Derivative financial instruments:        
Gains (losses) on cash flow hedges, before tax   11,148 227,509 (81,182)
Net gain (loss) on cash flow hedges   11,148 (174,984) (54,202)
Jet fuel Zero cost collars        
Derivative financial instruments:        
Gains (losses) on cash flow hedges, before tax   256,515 (122,948)  
Net gain (loss) on cash flow hedges   256,515 (122,948)  
Foreign currency forward contract        
Derivative financial instruments:        
Gains (losses) on cash flow hedges, before tax   (14,241) $ 66,757 (13,380)
Interest rate swap contracts        
Derivative financial instruments:        
Gains (losses) on cash flow hedges, before tax       317
Net gain (loss) on cash flow hedges       $ 14,144
Loss of the interest rate Cap        
Derivative financial instruments:        
Gains (losses) on cash flow hedges, before tax   (4,023)    
Net gain (loss) on cash flow hedges   (4,023)    
Non derivative financial instruments        
Derivative financial instruments:        
Gains (losses) on cash flow hedges, before tax   $ 14,096