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

Return flights

13 May - 20 May	Icelandair
05 May - 14 May	Icelandair
04 May - 14 May	Icelandair
05 May - 12 May	Icelandair
08 May - 22 May	Aer Lingus
01 May - 15 May	Aer Lingus
10 May - 17 May	Aer Lingus
12 May - 17 May	United
08 May - 21 May	United
04 May - 14 May	British Airways	direct
18 May - 02 Jun	Icelandair
17 May - 04 Jun	Delta
28 May - 02 Jun	Icelandair
28 May - 01 Jun	Icelandair
28 May - 04 Jun	Icelandair
26 May - 02 Jun	Icelandair
25 May - 11 Jun	Icelandair
29 May - 02 Jun	jetBlue
22 May - 01 Jun	Icelandair
25 May - 11 Jun	British Airways	direct

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

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 May from 476€

Return flights