Cheapest return flights from Seattle to London in April from 532€

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

23 Apr - 30 Apr Icelandair
07 Apr - 28 Apr Icelandair
01 Apr - 23 Apr Icelandair
08 Apr - 28 Apr Frontier Airlines
08 Apr - 22 Apr Frontier Airlines
01 Apr - 09 Apr Icelandair
29 Apr - 05 May Hawaiian Airlines
24 Apr - 03 May Icelandair
11 Apr - 21 Apr Frontier Airlines
17 Apr - 27 Apr Icelandair
17 Apr - 24 Apr Icelandair
02 Apr - 09 Apr Lufthansa

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