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

Return flights

19 Sep - 29 Sep	TUI	direct
18 Sep - 28 Sep	TUI	direct
16 Sep - 30 Sep	TUI	direct
19 Sep - 30 Sep	TUI	direct
16 Sep - 23 Sep	TUI	direct
19 Sep - 26 Sep	TUI	direct
18 Sep - 29 Sep	TUI	direct
18 Sep - 25 Sep	TUI	direct
19 Sep - 03 Oct	TUI	direct
18 Sep - 02 Oct	TUI	direct
22 Sep - 29 Sep	TUI	direct
23 Sep - 30 Sep	TUI	direct
30 Sep - 07 Oct	TUI	direct
25 Sep - 09 Oct	TUI	direct
29 Sep - 06 Oct	TUI	direct
25 Sep - 02 Oct	TUI	direct
26 Sep - 03 Oct	TUI	direct
25 Sep - 05 Oct	TUI	direct
28 Sep - 05 Oct	TUI	direct
26 Sep - 10 Oct	TUI	direct

Also check the deals for one-way flights from London to Cancun 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 London to Cancun in September from $407

Return flights