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

Return flights

16 Sep - 24 Sep	Delta
17 Sep - 24 Sep	Delta
11 Sep - 18 Sep	Virgin Atlantic
10 Sep - 18 Sep	Virgin Atlantic
08 Sep - 18 Sep	Virgin Atlantic
29 Sep - 06 Oct	Delta
15 Sep - 06 Oct	Virgin Atlantic
17 Sep - 26 Sep	Delta
03 Sep - 08 Sep	Virgin Atlantic
03 Sep - 12 Sep	Virgin Atlantic
10 Sep - 17 Sep	Virgin Atlantic
11 Sep - 16 Sep	Virgin Atlantic
26 Sep - 28 Oct	SWISS
26 Sep - 04 Oct	SWISS
24 Sep - 08 Oct	British Airways
24 Sep - 01 Oct	British Airways
09 Sep - 02 Oct	British Airways
27 Sep - 17 Oct	Delta
23 Sep - 07 Oct	British Airways
24 Sep - 07 Oct	British Airways

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 $808

Return flights