AirHint found the following cheapest return flights from London (LCY) to Cancun (CUN) in September 2026 (see full year).

Return flights

30 Sep - 11 Oct	Air Dolomiti
29 Sep - 11 Oct	Iberia
23 Sep - 07 Oct	Iberia
04 Sep - 19 Sep	SWISS
02 Sep - 16 Sep	Iberia
21 Sep - 24 Sep	Iberia
09 Sep - 15 Sep	Iberia
20 Sep - 27 Sep	Iberia
07 Sep - 14 Sep	Iberia
26 Sep - 06 Oct	SWISS
18 Sep - 29 Sep	SWISS
19 Sep - 26 Sep	SWISS
29 Sep - 05 Oct	Iberia
28 Sep - 11 Oct	Iberia
26 Sep - 03 Oct	SWISS
13 Sep - 20 Sep	British Airways
06 Sep - 13 Sep	British Airways
27 Sep - 10 Oct	KLM
29 Sep - 13 Oct	Aer Lingus

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 690€

Return flights