AirHint found the following cheapest return flights from Cancun (CUN) to London (STN) in September 2025 (see full year).

Return flights

19 Sep - 22 Sep	TUI fly Belgium
20 Sep - 27 Sep	Flair Airlines
25 Sep - 02 Oct	Flair Airlines
21 Sep - 28 Sep	TUI.nl
25 Sep - 13 Oct	Flair Airlines
17 Sep - 17 Oct	TUI
30 Sep - 07 Oct	TUI.nl
30 Sep - 26 Oct	TUI.nl
23 Sep - 30 Sep	TUI.nl
25 Sep - 07 Oct	Flair Airlines
19 Sep - 29 Sep	TUI
27 Sep - 01 Oct	TUI
19 Sep - 09 Oct	WestJet
27 Sep - 04 Oct	TUI
20 Sep - 21 Sep	TUI
19 Sep - 27 Sep	TUI fly Belgium
21 Sep - 05 Oct	WestJet
19 Sep - 21 Sep	TUI fly Belgium
18 Sep - 30 Sep	TUI
20 Sep - 29 Sep	WORLD2FLY

Also check the deals for one-way flights from Cancun 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 Cancun to London in September from $786

Return flights