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

Return flights

14 Apr - 29 Apr	Icelandair
14 Apr - 30 Apr	Frontier Airlines
03 Apr - 11 Apr	Icelandair
02 Apr - 07 Apr	Lufthansa
05 Apr - 16 Apr	Frontier Airlines
02 Apr - 05 Apr	Icelandair
01 Apr - 08 Apr	Lufthansa
17 Apr - 19 Apr	Lufthansa
01 Apr - 12 Apr	Lufthansa
15 Apr - 05 May	Air Canada
29 Apr - 04 May	Aer Lingus
01 Apr - 14 Apr	Hawaiian Airlines

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 485€

Return flights