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INVESTMENTS IN SUBSIDIARIES (Details 2) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of subsidiaries [line items]      
Total $ 91,147 $ 88,644  
Lan Peru S.A. [Member]      
Disclosure of subsidiaries [line items]      
Tax No . Foreign    
Country of origin Peru Peru  
Percentage of equity ownwrship 70.00% 70.00% 70.00%
Lan Cargo S.A. [Member]      
Disclosure of subsidiaries [line items]      
Tax No . 93.383.000-4    
Country of origin Chile Chile  
Percentage of equity ownwrship 99.898% 99.898% 99.898%
Lan Argentina S.A. [Member]      
Disclosure of subsidiaries [line items]      
Country of origin Argentina Argentina  
Percentage of equity ownwrship 99.8656% 99.8656%  
Aerolane Lineas Aereas Nacionales del Ecuador S.A. [Member]      
Disclosure of subsidiaries [line items]      
Country of origin Ecuador Ecuador  
Percentage of equity ownwrship 100.00% 100.00%  
Non-Controlling Interest [Member]      
Disclosure of subsidiaries [line items]      
Total $ 91,147 $ 88,644  
Non-Controlling Interest [Member] | Lan Peru S.A. [Member]      
Disclosure of subsidiaries [line items]      
Tax No . 0 - E 0 - E 0 - E
Country of origin Peru Peru Peru
Percentage of equity ownwrship 30.00% 30.00%  
Total $ 3,722 $ 3,360  
Non-Controlling Interest [Member] | Lan Cargo S.A. [Member]      
Disclosure of subsidiaries [line items]      
Tax No . 93.383.000 - 4 93.383.000 - 4 93.383.000 - 4
Country of origin Chile Chile Chile
Percentage of equity ownwrship 0.10196% 0.10196%  
Total $ 849 $ 957  
Non-Controlling Interest [Member] | Promotora Aerea Latinoamericana S.A. and Subsidiaries [Member]      
Disclosure of subsidiaries [line items]      
Tax No . 0 - E 0 - E 0 - E
Country of origin Mexico Mexico Mexico
Percentage of equity ownwrship 51.00% 51.00%  
Total $ 4,578 $ 3,162  
Non-Controlling Interest [Member] | Inversora Cordillera S.A. and Subsidiaries [Member]      
Disclosure of subsidiaries [line items]      
Tax No . 0 - E 0 - E 0 - E
Country of origin Argentina Argentina Argentina
Percentage of equity ownwrship 0.1394% 70.422%  
Total $ 3,502 $ 515  
Non-Controlling Interest [Member] | Lan Argentina S.A. [Member]      
Disclosure of subsidiaries [line items]      
Tax No . 0 - E 0 - E 0 - E
Country of origin Argentina Argentina Argentina
Percentage of equity ownwrship 0.02842% 0.1344%  
Total $ 79 $ (311)  
Non-Controlling Interest [Member] | Americonsult de Guatemala S.A. [Member]      
Disclosure of subsidiaries [line items]      
Tax No . 0 - E 0 - E 0 - E
Country of origin Guatemala Guatemala Guatemala
Percentage of equity ownwrship 1.00% 1.00%  
Total $ 1 $ 1  
Non-Controlling Interest [Member] | Americonsult Costa Rica S.A. [Member]      
Disclosure of subsidiaries [line items]      
Tax No . 0 - E 0 - E 0 - E
Country of origin Costa Rica Costa Rica Costa Rica
Percentage of equity ownwrship 1.00% 1.00%  
Total $ 12 $ 12  
Non-Controlling Interest [Member] | Linea Aerea Carguera de Colombiana S.A. [Mmeber]      
Disclosure of subsidiaries [line items]      
Tax No . 0 - E 0 - E 0 - E
Country of origin Colombia Colombia Colombia
Percentage of equity ownwrship 10.00% 10.00%  
Total $ (520) $ (905)  
Non-Controlling Interest [Member] | Aerolane Lineas Aereas Nacionales del Ecuador S.A. [Member]      
Disclosure of subsidiaries [line items]      
Tax No . 0 - E 0 - E  
Country of origin Colombia Colombia  
Percentage of equity ownwrship 0.8094% 0.8094%  
Total $ 461 $ 436  
Non-Controlling Interest [Member] | Transportes Aereos del Mercosur S.A. [Member]      
Disclosure of subsidiaries [line items]      
Tax No . 0 - E 0 - E 0 - E
Country of origin Paraguay Paraguay Paraguay
Percentage of equity ownwrship 5.02% 5.02%  
Total $ 1,324 $ 1,104  
Non-Controlling Interest [Member] | Multiplus S.A. [Member]      
Disclosure of subsidiaries [line items]      
Tax No . 0 - E 0 - E 0 - E
Country of origin Brazil Brazil Brazil
Percentage of equity ownwrship 27.26% 27.26%  
Total $ 77,139 $ 80,313