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

Return flights

26 Aug - 09 Sep	Air France
29 Aug - 09 Sep	Lufthansa
30 Aug - 09 Sep	Lufthansa
31 Aug - 14 Sep	Lufthansa
29 Aug - 10 Sep	Lufthansa
31 Aug - 11 Sep	Air France
31 Aug - 10 Sep	Air France
22 Aug - 10 Sep	Lufthansa
31 Aug - 09 Sep	Air France
24 Aug - 11 Sep	Air France
18 Aug - 25 Aug	Finnair
21 Aug - 25 Aug	United
22 Aug - 25 Aug	United
23 Aug - 25 Aug	United
21 Aug - 24 Aug	Delta
17 Aug - 24 Aug	Delta
07 Aug - 12 Aug	Delta
07 Aug - 14 Aug	Delta
20 Aug - 24 Aug	Finnair
08 Aug - 16 Aug	United

Also check the deals for one-way flights from London to Cancun in August.

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 August from $729

Return flights