AirHint found the following cheapest return flights from Busan (PUS) to London (LHR) in September 2025 (see full year).

Return flights

17 Sep - 24 Sep	Air China
08 Sep - 15 Sep	Vietnam Airlines
08 Sep - 16 Sep	Vietnam Airlines
11 Sep - 18 Sep	Air China
08 Sep - 17 Sep	Air China
30 Sep - 14 Oct	Vietnam Airlines
02 Sep - 09 Sep	T'way Air
05 Sep - 17 Sep	Air China
18 Sep - 23 Sep	Air China
25 Sep - 13 Oct	China Airlines
18 Sep - 30 Sep	China Airlines
28 Sep - 06 Oct	China Airlines
28 Sep - 08 Oct	China Airlines
18 Sep - 25 Sep	Korean Air
29 Sep - 10 Oct	China Airlines
30 Sep - 11 Oct	China Airlines
02 Sep - 06 Oct	Korean Air
25 Sep - 09 Oct	Cathay Pacific
28 Sep - 09 Oct	Vietnam Airlines

Also check the deals for one-way flights from Busan to London in September.

The deals are updated regularly. The prices may go up as tickets are purchased by other travellers. Only the cheapest flights are offered. Select a price to book and secure these cheap prices.

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Cheapest return flights from Busan to London in September from $762

Return flights