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

Return flights

28 Jul - 11 Aug	Air Canada
29 Jul - 03 Aug	British Airways	direct
15 Jul - 29 Jul	British Airways	direct
20 Jul - 03 Aug	British Airways	direct
09 Jul - 23 Jul	British Airways	direct
01 Jul - 01 Aug	Finnair
01 Jul - 01 Aug	British Airways	direct

Also check the deals for one-way flights from Seattle to London in July.

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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Cheapest return flights from Seattle to London in July from 551€

Return flights