AirHint found the following cheapest one-way flights from London (LON) to Cancun (CUN) in September 2025 (see full year).

One-Way flights

19 Sep	TUI	direct
23 Sep	easyJet
28 Sep	TUI	direct
30 Sep	TUI	direct
26 Sep	TUI	direct
25 Sep	TUI	direct
22 Sep	TUI	direct
22 Sep	easyJet
21 Sep	TUI	direct
23 Sep	TUI	direct

Also check the deals for return 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 one-way flights from London to Cancun in September from 254€

One-Way flights