Cheapest one-way flights from Seattle to London in April from 226€

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

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

One-Way flights

08 Apr Frontier Airlines
30 Apr Spirit Airlines
01 Apr Frontier Airlines
03 Apr Frontier Airlines
06 Apr Frontier Airlines
07 Apr Frontier Airlines
05 Apr Frontier Airlines
15 Apr Frontier Airlines
24 Apr Icelandair
22 Apr Alaska Airlines

Also check the deals for return 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