Cheapest return flights from Seattle to London in May from $617
AirHint found the following cheapest return flights from Seattle (SEA) to London (LHR) in May 2025 (see full year).
Return flights
Also check the deals for one-way flights from Seattle to London in May.
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.
