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ACCOUNTING ESTIMATES AND JUDGMENTS (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Jan. 01, 2018
Dec. 31, 2017
Dec. 31, 2016
ACCOUNTING ESTIMATES AND JUDGMENTS (Details) [Line Items]          
Goodwill $ 2,209,576 $ 2,294,072   $ 2,672,550 $ 2,710,382
Deferred tax assets 235,583 273,529 $ 370,115 $ 370,564  
Recognize deferred tax assets for tax losses 110,933 137,761      
Deferred revenue $ 1,511,991 1,299,304      
Description of change in ticket usage A hypothetical change of one percentage point in passenger behavior with respect to use would result in an impact of up to ThUS$ 6,000 per month.        
Lease liabilities $ 105,000        
Airports Slots [Member] | Air Transport CGU [Member]          
ACCOUNTING ESTIMATES AND JUDGMENTS (Details) [Line Items]          
Intangible assets with indefinite useful life 845,959 828,969      
Airports Slots [Member] | Coalition and Loyalty Program Multiplus CGU [Member]          
ACCOUNTING ESTIMATES AND JUDGMENTS (Details) [Line Items]          
Intangible assets with indefinite useful life      
Loyalty Program [Member] | Air Transport CGU [Member]          
ACCOUNTING ESTIMATES AND JUDGMENTS (Details) [Line Items]          
Intangible assets with indefinite useful life 263,806      
Loyalty Program [Member] | Coalition and Loyalty Program Multiplus CGU [Member]          
ACCOUNTING ESTIMATES AND JUDGMENTS (Details) [Line Items]          
Intangible assets with indefinite useful life 274,420      
LATAM Pass Loyalty Program [Member]          
ACCOUNTING ESTIMATES AND JUDGMENTS (Details) [Line Items]          
Deferred revenue 1,332,173 1,324,635      
Probable change in deferred revenue 31,565 27,726      
LATAM Fidelidade and Multiplus Loyalty Program [Member]          
ACCOUNTING ESTIMATES AND JUDGMENTS (Details) [Line Items]          
Deferred revenue 354,847 293,831      
Probable change in deferred revenue 12,501 13,140      
Financial assets collectively assessed for credit losses [member] | Loyalty Program [Member] | Coalition and Loyalty Program Multiplus CGU [Member]          
ACCOUNTING ESTIMATES AND JUDGMENTS (Details) [Line Items]          
Intangible assets with indefinite useful life $ 263,806 $ 274,420