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

Return flights

19 Apr - 28 Apr	Air Canada
13 Apr - 20 Apr	Icelandair
23 Apr - 30 Apr	Icelandair
01 Apr - 10 Apr	Air Canada
03 Apr - 10 Apr	British Airways	direct
13 Apr - 20 Apr	British Airways	direct
23 Apr - 30 Apr	British Airways	direct
15 Apr - 09 May	British Airways	direct
03 Apr - 25 Apr	United
03 Apr - 25 Apr	British Airways	direct
01 Apr - 10 Apr	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 468€

Return flights