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

Return flights

13 Apr - 20 Apr	Icelandair
25 Apr - 30 Apr	Icelandair
28 Apr - 06 May	Icelandair
18 Apr - 16 May	Icelandair
23 Apr - 30 Apr	Icelandair
29 Apr - 14 May	Air Canada
15 Apr - 05 May	Air Canada
01 Apr - 09 Apr	United
01 Apr - 10 Apr	United
01 Apr - 08 Apr	United
05 Apr - 16 Apr	United
14 Apr - 24 Apr	United
07 Apr - 21 Apr	United
08 Apr - 06 May	United
08 Apr - 18 Apr	Lufthansa
29 Apr - 14 May	Lufthansa	direct
15 Apr - 05 May	Lufthansa	direct
26 Apr - 03 May	United
28 Apr - 06 May	British Airways	direct
18 Apr - 16 May	British Airways	direct

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

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 April from 437€

Return flights