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

Return flights

16 Sep - 21 Sep	Air Canada
16 Sep - 23 Sep	Air Canada
19 Sep - 06 Oct	Air Canada
16 Sep - 06 Oct	Air Canada
25 Sep - 04 Oct	Air Canada
19 Sep - 23 Sep	Air Canada
09 Sep - 14 Sep	Air Canada
17 Sep - 21 Sep	Air Canada
18 Sep - 23 Sep	Air Canada
09 Sep - 29 Sep	Air Canada
24 Sep - 30 Sep	Air Canada
26 Sep - 29 Sep	Air Canada
09 Sep - 16 Sep	Air Canada
26 Sep - 09 Oct	Air Canada
26 Sep - 06 Oct	Air Canada
24 Sep - 02 Oct	Air Canada
18 Sep - 16 Oct	Air Canada
23 Sep - 14 Oct	Air Canada
17 Sep - 13 Oct	Air Canada
24 Sep - 14 Oct	Air Canada

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 551€

Return flights