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Cover Page
 12 Months Ended
Dec. 31, 2023
shares
Entity Information [Line Items]  
Document Type 20-F
Document Registration Statement false
Document Annual Report true
Current Fiscal Year End Date --12-31
Document Period End Date Dec. 31, 2023
Document Transition Report false
Document Shell Company Report false
Entity File Number 001-38904
Entity Registrant Name FLEX LNG Ltd.
Entity Incorporation, State or Country Code D0
Entity Address, Address Line One Par-La-Ville Place
Entity Address, Address Line Two 14 Par-La-Ville Road
Entity Address, City or Town Hamilton
Entity Address, Postal Zip Code HM08
Entity Address, Country BM
Title of 12(b) Security Ordinary Shares, par value $0.10 per share
Trading Symbol FLNG
Security Exchange Name NYSE
Common Stock, Shares, Outstanding 53,736,318
Entity Well-known Seasoned Issuer No
Entity Voluntary Filers No
Entity Current Reporting Status Yes
Entity Interactive Data Current Yes
Entity Filer Category Large Accelerated Filer
Document Financial Statement Error Correction [Flag] false
ICFR Auditor Attestation Flag true
Document Accounting Standard U.S. GAAP
Entity Shell Company false
Entity Central Index Key 0001772253
Document Fiscal Year Focus 2023
Document Fiscal Period Focus FY
Amendment Flag false
Entity Emerging Growth Company false
Business Contact  
Entity Information [Line Items]  
Entity Address, Address Line One Par-La-Ville Place
Entity Address, Address Line Two 14 Par-La-Ville Road
Entity Address, City or Town Hamilton
Entity Address, Postal Zip Code HM08
Entity Address, Country BM
Contact Personnel Name James Ayers, Company Secretary
City Area Code 441
Local Phone Number 295 69 35
Contact Personnel Fax Number 295 3494