Cheapest one-way flights from Seattle to London in April from $260

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

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

One-Way flights

23 Apr Icelandair
28 Apr Icelandair
01 Apr Icelandair
15 Apr WestJet
24 Apr Icelandair
26 Apr Icelandair
16 Apr Icelandair
16 Apr British Airways direct
01 Apr Virgin Atlantic direct
28 Apr Virgin Atlantic direct

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.

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