Cheapest return flights from Seattle to London in April from 410€

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

Return flights

22 Apr - 29 Apr Lufthansa
22 Apr - 29 Apr British Airways direct
15 Apr - 22 Apr British Airways direct
17 Apr - 05 May Air Canada
17 Apr - 05 May Virgin Atlantic direct
01 Apr - 12 Apr Air Canada
03 Apr - 17 Apr Lufthansa
11 Apr - 18 Apr Icelandair
24 Apr - 03 May Icelandair
25 Apr - 02 May Icelandair
24 Apr - 03 May Finnair direct
25 Apr - 02 May British Airways direct
02 Apr - 25 Apr Finnair
11 Apr - 18 Apr Air France direct
04 Apr - 11 Apr Air Canada
05 Apr - 12 Apr British Airways direct
23 Apr - 31 May British Airways direct
30 Apr - 31 May British Airways direct

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

Skyscanner

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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