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

Return flights

17 Sep - 24 Sep	Delta
29 Sep - 13 Oct	Delta
10 Sep - 24 Sep	Virgin Atlantic
10 Sep - 15 Sep	Virgin Atlantic
03 Sep - 17 Sep	Virgin Atlantic
10 Sep - 17 Sep	Virgin Atlantic
29 Sep - 06 Oct	Delta
22 Sep - 06 Oct	Virgin Atlantic
05 Sep - 12 Sep	Virgin Atlantic
02 Sep - 16 Sep	KLM
03 Sep - 08 Sep	Virgin Atlantic
06 Sep - 17 Sep	Virgin Atlantic
03 Sep - 10 Sep	British Airways
17 Sep - 15 Oct	British Airways
10 Sep - 02 Oct	British Airways
01 Sep - 08 Oct	Virgin Atlantic
24 Sep - 16 Oct	Lufthansa
12 Sep - 11 Oct	SWISS
10 Sep - 04 Oct	Virgin Atlantic
15 Sep - 04 Oct	Virgin Atlantic

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 $804

Return flights