China Southern Airlines Company Limited (CHKIF) 6-KCurrent report (foreign)

Exhibit 99.1

Hong Kong Exchanges and Clearing Limited and The Stock Exchange of Hong Kong Limited take no responsibility for the contents of this announcement, make no representation as to its accuracy or completeness and expressly disclaim any liability whatsoever for any loss howsoever arising from or in reliance upon the whole or any part of the contents of this announcement.

(a joint stock limited company incorporated in the People’s Republic of China with limited liability)

(Stock Code: 1055)

ANNOUNCEMENT ON KEY OPERATING DATA

This announcement is made based on the operating data for May 2023 of China Southern Airlines Company Limited (the “Company”) and its subsidiaries (collectively, the “Group”) to be published on the Shanghai Stock Exchange, and pursuant to Rules 13.09 and 13.10B of the Rules Governing the Listing of Securities on The Stock Exchange of Hong Kong Limited (the “Listing Rules”) and the Inside Information Provisions (as defined in the Listing Rules) under Part XIVA of the Securities and Futures Ordinance (Chapter 571 of the Laws of Hong Kong).

In May 2023, passenger capacity (measured by available seat kilometres (“ASK”)) of the Group increased by 181.36% as compared with the same period last year (a year-on-year (“YoY”) basis), of which, passenger capacity for domestic routes, regional routes and international routes increased by 158.46%, 1957.33% and 526.45%, respectively, as compared with the same period last year. Compared with the same period last year, passenger traffic (measured by revenue passenger kilometres (“RPK”)) increased by 248.04%, of which, passenger traffic for domestic routes, regional routes and international routes increased by 220.85%, 3031.56% and 614.07%, respectively, as compared with the same period last year. The passenger load factor was 75.25%, representing an increase of 14.42 percentage points as compared with the same period last year, of which, the passenger load factor for domestic routes, regional routes and international routes increased by 14.59, 25.67 and 9.40 percentage points, respectively, as compared with the same period last year.

1

In terms of cargo operations, in May 2023, cargo capacity (measured by available tonne kilometers (“ATK”) - Cargo and Mail) increased by 24.76% as compared with the same period last year. Cargo and mail traffic (measured by revenue tonne kilometres (“RTK”) - Cargo and Mail) decreased by 3.91% as compared with the same period last year. The cargo and mail load factor was 49.15%, representing a decrease of 14.67 percentage points as compared with the same period last year.

In May 2023, the Group has newly launched the following major route: Chongqing – Kuala Lumpur – Chongqing (being four flights a week).

In May 2023, the Group introduced three aircrafts (including one A321NEO aircraft, one ARJ21 aircraft and one B777F aircraft). As of the end of May 2023, the Group operated a fleet of 892 commercial aircrafts as set out below:

2

KEY OPERATING DATA OF MAY 2023

3

Notes:

The key operating data above was calculated based on the internal preliminary statistics of the Group, which may be subsequently adjusted or differ from the data disclosed in the relevant periodic reports. Investors are hereby reminded of the risks which may result from inappropriate reliance upon or utilization of the information given above.

4

Guangzhou, the People’s Republic of China

15 June 2023

As at the date of this announcement, the Directors include Ma Xu Lun, Han Wen Sheng and Luo Lai Jun as executive Directors; and Liu Chang Le, Gu Hui Zhong, Guo Wei and Cai Hong Ping as independent non-executive Directors.

5