Cheapest return flights from Denver to London in April from $519

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
30 Apr - 07 May Icelandair
30 Apr - 08 May Icelandair
16 Apr - 14 May Icelandair
17 Apr - 20 Apr Air Canada
23 Apr - 04 May Icelandair
23 Apr - 30 Apr Icelandair
02 Apr - 09 Apr Icelandair
01 Apr - 07 Apr Air Canada
15 Apr - 22 Apr Air Canada
19 Apr - 27 Apr Air Canada
01 Apr - 07 Apr Finnair direct
05 Apr - 16 Apr Finnair direct
14 Apr - 24 Apr Finnair
08 Apr - 06 May United
15 Apr - 05 May United
26 Apr - 03 May Finnair
30 Apr - 07 May American Airlines direct
30 Apr - 08 May American Airlines direct
26 Apr - 03 May American Airlines direct

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

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