| Cover | 12 Months Ended |
| Dec. 31, 2022 shares |
| Document Information [Line Items] | |
| Document Type | 20-F/A |
| Amendment Flag | true |
| Document Period End Date | Dec. 31, 2022 |
| Document Fiscal Year Focus | 2022 |
| Document Fiscal Period Focus | FY |
| Entity Registrant Name | CHINA SOUTHERN AIRLINES COMPANY LIMITED |
| Entity Central Index Key | 0001041668 |
| Current Fiscal Year End Date | --12-31 |
| Entity Well-known Seasoned Issuer | No |
| Entity Current Reporting Status | Yes |
| Entity Filer Category | Large Accelerated Filer |
| Entity Shell Company | false |
| Entity Emerging Growth Company | false |
| Entity Voluntary Filers | No |
| Entity Interactive Data Current | Yes |
| Document Accounting Standard | International Financial Reporting Standards |
| Document Annual Report | true |
| Entity Address, Country | CN |
| Document Transition Report | false |
| Document Shell Company Report | false |
| Document Registration Statement | false |
| Title of 12(g) Security | Ordinary H Shares of par valueRMB1.00 per sharerepresented by AmericanDepositary Shares |
| Entity Incorporation, State or Country Code | F4 |
| ICFR Auditor Attestation Flag | true |
| Entity Address, Address Line One | 68 QI XIN ROAD |
| Entity Address, City or Town | GUANGZHOU |
| Entity File Number | 001-14660 |
| Entity Address, Postal Zip Code | 510403 |
| Auditor Name | KPMG Huazhen LLP |
| Auditor Firm ID | 1186 |
| Auditor Location | Guangzhou, China |
| No Trading Symbol Flag | true |
| Amendment Description | China Southern Airlines Company Limited (the “Company”) is filing this Amendment No. 1 (this “Amendment No. 1” or “Form 20-F/A”) to its Annual Report on Form 20-F for the fiscal year ended December 31, 2022, as originally filed with the U.S. Securities and Exchange Commission (the “SEC”) on April 27, 2023 (the “Original Annual Report”), to address certain comments from the Staff of the SEC in relation to the Original Annual Report. Accordingly, the Company is restating in their entirety the following sections of the Original Annual Report: (1) “Part II - Item 16I. Disclosure Regarding Foreign Jurisdictions That Prevent Inspections” and (2) “Part III - Item 19. Exhibits” in this Amendment No. 1. This Amendment No. 1 speaks as of the date of the Original Annual Report. Other than as set forth above, this Amendment No. 1 does not, and does not purport to, amend, update or restate in any way the financial statements or any other item contained in the Original Annual Report as originally filed with the SEC (including the cover page hereto). As a result, this Amendment No. 1 does not reflect any events that may have occurred after the filing of the Original Annual Report on April 27, 2023. Accordingly, this Amendment No. 1 should be read in conjunction with the Original Annual Report and the Company’s other filings with, and reports furnished to, the SEC subsequent to April 27, 2023. As required by Rule 12b-15 of the Securities Exchange Act of 1934, as amended, new certifications required under Section 302 of the Sarbanes-Oxley Act of 2002 are filed herewith as exhibits to this Amendment No. 1. |
| Document Financial Statement Error Correction [Flag] | false |
| Business Contact [Member] | |
| Document Information [Line Items] | |
| Entity Address, Country | CN |
| Contact Personnel Name | Mr. Chen Weihua |
| Contact Personnel Email Address | ir@csair.com |
| Contact Personnel Fax Number | 86 20 86659040 |
| Entity Address, Address Line One | 68 QI XIN ROAD |
| Entity Address, City or Town | GUANGZHOU |
| City Area Code | 86 20 |
| Local Phone Number | 86112480 |
| Entity Address, Postal Zip Code | 510403 |
| A Shares (par value RMB1.00 per share) [member] | |
| Document Information [Line Items] | |
| Entity Common Stock, Shares Outstanding | 13,476,895,402 |
| H Shares (par value RMB1.00 per share) [member] | |
| Document Information [Line Items] | |
| Entity Common Stock, Shares Outstanding | 4,643,997,308 |
