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

Return flights

30 Aug - 06 Sep	easyJet
29 Aug - 06 Sep	easyJet
15 Aug - 18 Aug	easyJet
07 Aug - 18 Aug	easyJet
28 Aug - 06 Sep	easyJet
08 Aug - 18 Aug	easyJet
23 Aug - 06 Sep	easyJet
11 Aug - 18 Aug	easyJet
06 Aug - 09 Aug	Ryanair
11 Aug - 01 Sep	easyJet
30 Aug - 02 Sep	easyJet
02 Aug - 27 Aug	Ryanair
01 Aug - 17 Aug	easyJet
11 Aug - 16 Aug	easyJet
26 Aug - 02 Sep	easyJet
01 Aug - 09 Aug	easyJet
20 Aug - 02 Sep	Ryanair
21 Aug - 28 Aug	easyJet
27 Aug - 01 Sep	easyJet

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 858€

Return flights