FINANCIAL RISK MANAGEMENT - Schedule of classification of financial instruments at fair value (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Financial Risk Management [Line Items]
Financial assets, at fair value		$ 5,470,625
Other financial liabilities, current
Financial Risk Management [Line Items]
Financial liabilities, at fair value	$ 1,544	0
Fair value of foreign currency derivatives
Financial Risk Management [Line Items]
Financial liabilities, at fair value	1,544	0
Cash and cash equivalents
Financial Risk Management [Line Items]
Financial assets, at fair value	89,706
Assets		95,452
Short-term mutual funds
Financial Risk Management [Line Items]
Financial assets, at fair value	89,706
Assets		95,452
Other financial assets, current
Financial Risk Management [Line Items]
Financial assets, at fair value	22,136
Assets		21,601
Fair value interest rate derivatives
Financial Risk Management [Line Items]
Financial assets, at fair value	0
Assets		8,816
Fair value of fuel derivatives
Financial Risk Management [Line Items]
Financial assets, at fair value	22,136
Assets		12,594
Fair value of foreign currency derivatives
Financial Risk Management [Line Items]
Financial assets, at fair value	0
Assets		191
Level I \| Other financial liabilities, current
Financial Risk Management [Line Items]
Liabilities	0	0
Level I \| Fair value of foreign currency derivatives
Financial Risk Management [Line Items]
Liabilities	0	0
Level I \| Cash and cash equivalents
Financial Risk Management [Line Items]
Assets	89,706	95,452
Level I \| Short-term mutual funds
Financial Risk Management [Line Items]
Assets	89,706	95,452
Level I \| Other financial assets, current
Financial Risk Management [Line Items]
Assets	0	0
Level I \| Fair value interest rate derivatives
Financial Risk Management [Line Items]
Assets	0	0
Level I \| Fair value of fuel derivatives
Financial Risk Management [Line Items]
Assets	0	0
Level I \| Fair value of foreign currency derivatives
Financial Risk Management [Line Items]
Assets	0	0
Level II \| Other financial liabilities, current
Financial Risk Management [Line Items]
Liabilities	1,544	0
Level II \| Fair value of foreign currency derivatives
Financial Risk Management [Line Items]
Liabilities	1,544	0
Level II \| Cash and cash equivalents
Financial Risk Management [Line Items]
Assets	0	0
Level II \| Short-term mutual funds
Financial Risk Management [Line Items]
Assets	0	0
Level II \| Other financial assets, current
Financial Risk Management [Line Items]
Assets	22,136	21,601
Level II \| Fair value interest rate derivatives
Financial Risk Management [Line Items]
Assets	0	8,816
Level II \| Fair value of fuel derivatives
Financial Risk Management [Line Items]
Assets	22,136	12,594
Level II \| Fair value of foreign currency derivatives
Financial Risk Management [Line Items]
Assets	0	191
Level III \| Other financial liabilities, current
Financial Risk Management [Line Items]
Liabilities	0	0
Level III \| Fair value of foreign currency derivatives
Financial Risk Management [Line Items]
Liabilities	0	0
Level III \| Cash and cash equivalents
Financial Risk Management [Line Items]
Assets	0	0
Level III \| Short-term mutual funds
Financial Risk Management [Line Items]
Assets	0	0
Level III \| Other financial assets, current
Financial Risk Management [Line Items]
Assets	0	0
Level III \| Fair value interest rate derivatives
Financial Risk Management [Line Items]
Assets	0	0
Level III \| Fair value of fuel derivatives
Financial Risk Management [Line Items]
Assets	0	0
Level III \| Fair value of foreign currency derivatives
Financial Risk Management [Line Items]
Assets	$ 0	$ 0

The amount of assets that are: (a) cash; (b) an equity instrument of another entity; (c) a contractual right: (i) to receive cash or another financial asset from another entity; or (ii) to exchange financial assets or financial liabilities with another entity under conditions that are potentially favourable to the entity; or (d) a contract that will, or may be, settled in the entity’s own equity instruments and is: (i) a non-derivative for which the entity is, or may be, obliged to receive a variable number of the entity’s own equity instruments; or (ii) a derivative that will, or may be, settled other than by the exchange of a fixed amount of cash or another financial asset for a fixed number of the entity’s own equity instruments. For this purpose the entity’s own equity instruments do not include puttable financial instruments classified as equity instruments in accordance with paragraphs 16A-16B of IAS 32, instruments that impose on the entity an obligation to deliver to another party a pro rata share of the net assets of the entity only on liquidation and are classified as equity instruments in accordance with paragraphs 16C-16D of IAS 32, or instruments that are contracts for the future receipt or delivery of the entity’s own equity instruments. [Refer: Financial instruments, class [member]; Financial liabilities]

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 7
-IssueDate 2023-01-01
-Paragraph 25
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2023-en-r&anchor=para_25&doctype=Standard
-URIDate 2023-03-23

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 7
-IssueDate 2023-01-01
-Paragraph 35H
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2023-en-r&anchor=para_35H&doctype=Standard
-URIDate 2023-03-23

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 7
-IssueDate 2023-01-01
-Paragraph 35M
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2023-en-r&anchor=para_35M&doctype=Standard
-URIDate 2023-03-23

Reference 4: http://www.xbrl.org/2003/role/exampleRef
-Name IFRS
-Number 7
-IssueDate 2023-01-01
-Paragraph 35N
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2023-en-r&anchor=para_35N&doctype=Standard
-URIDate 2023-03-23

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 7
-IssueDate 2023-01-01
-Paragraph 35I
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2023-en-r&anchor=para_35I&doctype=Standard
-URIDate 2023-03-23

+ Details

Name:	ifrs-full_FinancialAssets
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The fair value of financial assets. [Refer: At fair value [member]; Financial assets]

+ References

+ Details

Name:	ifrs-full_FinancialAssetsAtFairValue
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The amount of liabilities that are: (a) a contractual obligation: (i) to deliver cash or another financial asset to another entity; or (ii) to exchange financial assets or financial liabilities with another entity under conditions that are potentially unfavourable to the entity; or (b) a contract that will, or may be, settled in the entity’s own equity instruments and is: (i) a non-derivative for which the entity is, or may be, obliged to deliver a variable number of the entity’s own equity instruments; or (ii) a derivative that will, or may be, settled other than by the exchange of a fixed amount of cash or another financial asset for a fixed number of the entity’s own equity instruments. For this purpose, rights, options or warrants to acquire a fixed number of the entity’s own equity instruments for a fixed amount of any currency are equity instruments if the entity offers the rights, options or warrants pro rata to all of its existing owners of the same class of its own non-derivative equity instruments. Also, for those purposes the entity’s own equity instruments do not include puttable financial instruments that are classified as equity instruments in accordance with paragraphs 16A-16B of IAS 32, instruments that impose on the entity an obligation to deliver to another party a pro rata share of the net assets of the entity only on liquidation and are classified as equity instruments in accordance with paragraphs 16C-16D of IAS 32, or instruments that are contracts for the future receipt or delivery of the entity’s own equity instruments. As an exception, an instrument that meets the definition of a financial liability is classified as an equity instrument if it has all the features and meets the conditions in paragraphs 16A-16B or paragraphs 16C-16D of IAS 32. [Refer: Financial instruments, class [member]; Financial assets; Derivatives [member]]

+ References

+ Details

Name:	ifrs-full_FinancialLiabilities
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The fair value of financial liabilities. [Refer: At fair value [member]; Financial liabilities]

+ References

+ Details

Name:	ifrs-full_FinancialLiabilitiesAtFairValue
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Financial Risk Management

+ References

No definition available.

+ Details

Name:	ltm_FinancialRiskManagementLineItems
Namespace Prefix:	ltm_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	ifrs-full_ClassesOfFinancialLiabilitiesAxis=ltm_OtherFinancialLiabilitiesCurrentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_ClassesOfFinancialLiabilitiesAxis=ltm_FairValueOfForeignCurrencyDerivativesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_ClassesOfFinancialAssetsAxis=ltm_CashAndCashEquivalents1Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_ClassesOfFinancialAssetsAxis=ltm_ShortTermMutualFundsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_ClassesOfFinancialAssetsAxis=ltm_OtherFinancialAssetsCurrentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_ClassesOfFinancialAssetsAxis=ltm_FairValueInterestRateDerivativesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_ClassesOfFinancialAssetsAxis=ltm_FairValueOfFuelDerivativesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_ClassesOfFinancialAssetsAxis=ltm_FairValueOfForeignCurrencyDerivativeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_LevelsOfFairValueHierarchyAxis=ifrs-full_Level1OfFairValueHierarchyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_LevelsOfFairValueHierarchyAxis=ifrs-full_Level2OfFairValueHierarchyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_LevelsOfFairValueHierarchyAxis=ifrs-full_Level3OfFairValueHierarchyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: