AirHint found the following cheapest return flights from Denver (DEN) to London (LHR) in October 2025 (see full year).

Return flights

24 Oct - 02 Nov	Icelandair
24 Oct - 31 Oct	Icelandair
27 Oct - 03 Nov	Icelandair
25 Oct - 04 Nov	Air Canada
15 Oct - 22 Oct	Lufthansa
05 Oct - 15 Oct	Lufthansa
05 Oct - 17 Oct	Lufthansa
15 Oct - 21 Oct	Air Canada
24 Oct - 29 Oct	Icelandair
14 Oct - 08 Nov	Icelandair
05 Oct - 14 Oct	Lufthansa	direct
05 Oct - 16 Oct	Lufthansa	direct
17 Oct - 29 Oct	Icelandair
22 Oct - 06 Nov	Icelandair
05 Oct - 13 Oct	Virgin Atlantic
07 Oct - 01 Nov	Icelandair
30 Oct - 06 Nov	Icelandair
22 Oct - 06 Nov	British Airways	direct
20 Oct - 05 Nov	British Airways	direct
27 Oct - 07 Nov	Delta

Also check the deals for one-way flights from Denver to London in October.

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 Denver to London in October from 436€

Return flights