Cheapest return flights from Seattle to London in April from 573€

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

30 Apr - 07 May Spirit Airlines
30 Apr - 05 May Icelandair
29 Apr - 08 May Icelandair
01 Apr - 13 Apr Icelandair
22 Apr - 06 May Icelandair
25 Apr - 09 May Icelandair
14 Apr - 22 Apr Icelandair
25 Apr - 02 May Icelandair
07 Apr - 12 Apr Icelandair
21 Apr - 05 May Icelandair
09 Apr - 30 Apr Icelandair
19 Apr - 27 Apr Icelandair
18 Apr - 22 Apr Icelandair
12 Apr - 26 Apr Icelandair
10 Apr - 18 Apr Icelandair
17 Apr - 20 Apr Icelandair
05 Apr - 13 Apr Turkish Airlines

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