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

Return flights

18 Jan - 25 Jan	Icelandair
07 Jan - 14 Jan	Icelandair
06 Jan - 11 Jan	Icelandair
13 Jan - 27 Jan	Air Canada
07 Jan - 14 Jan	British Airways	direct
13 Jan - 20 Jan	British Airways
28 Jan - 04 Feb	British Airways
08 Jan - 15 Jan	British Airways	direct
18 Jan - 25 Jan	British Airways	direct
23 Jan - 30 Jan	British Airways	direct
03 Jan - 17 Jan	Delta

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 $525

Return flights