Cheapest return flights from Seattle to London in April from 555€

Best time to book flights for Seattle (SEA) to London (LGW) flights at AirHint

AirHint found the following cheapest return flights from Seattle (SEA) to London (LGW) in April 2025 (see full year).

Return flights

29 Apr - 07 May Spirit Airlines
22 Apr - 30 Apr Icelandair
01 Apr - 15 Apr Icelandair
01 Apr - 07 Apr Frontier Airlines
25 Apr - 09 May Icelandair
25 Apr - 02 May Icelandair
26 Apr - 04 May Icelandair
24 Apr - 27 Apr Icelandair
25 Apr - 03 May Icelandair
25 Apr - 04 May Icelandair
16 Apr - 30 Apr Icelandair
09 Apr - 15 Apr Lufthansa
02 Apr - 10 Apr Icelandair
29 Apr - 24 May Icelandair
13 Apr - 20 Apr Icelandair
05 Apr - 12 Apr Air Canada
16 Apr - 18 Apr Icelandair

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.

Book a cheap hotel in London

Cheap car rent in London