AirHint found the following cheapest return flights from Denver (DEN) to London (LGW) in January 2026 (see full year).

Return flights

30 Jan - 02 Feb	Frontier Airlines
18 Jan - 25 Jan	Frontier Airlines
11 Jan - 27 Jan	Frontier Airlines
11 Jan - 17 Jan	Frontier Airlines
19 Jan - 29 Jan	Icelandair
14 Jan - 25 Jan	Icelandair
06 Jan - 13 Jan	Icelandair
15 Jan - 27 Jan	Frontier Airlines
15 Jan - 24 Jan	Frontier Airlines
01 Jan - 08 Jan	Turkish Airlines
02 Jan - 08 Jan	Turkish Airlines

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

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 January from 419€

Return flights