Cheapest return flights from Seattle to London in April from 512€

AirHint found the following cheapest return flights from Seattle (SEA) to London (LHR) in April 2026 (see full year).

Return flights

29 Apr - 13 May Air Canada
01 Apr - 10 Apr Lufthansa
05 Apr - 12 Apr Lufthansa
01 Apr - 10 Apr Air France direct
09 Apr - 18 Apr Icelandair
08 Apr - 18 Apr Lufthansa
05 Apr - 12 Apr Air France direct
08 Apr - 18 Apr Delta direct
03 Apr - 11 Apr Air Canada
09 Apr - 18 Apr Delta direct
03 Apr - 11 Apr Air France direct

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.

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