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

Return flights

29 Jul - 22 Aug	British Airways	direct
08 Jul - 22 Jul	Air Canada
08 Jul - 22 Jul	British Airways	direct
07 Jul - 15 Jul	British Airways	direct
15 Jul - 02 Aug	Lufthansa
18 Jul - 02 Aug	SWISS
02 Jul - 12 Jul	Scandinavian Airlines
21 Jul - 02 Aug	Lufthansa
02 Jul - 12 Jul	British Airways	direct
15 Jul - 02 Aug	Air France	direct
21 Jul - 02 Aug	Air France	direct
18 Jul - 02 Aug	Air France	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 609€

Return flights