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

Return flights

27 Feb - 06 Mar	Icelandair
25 Feb - 03 Mar	Icelandair
09 Feb - 23 Feb	Icelandair
09 Feb - 02 Mar	Icelandair
28 Feb - 08 Mar	Air Canada
18 Feb - 27 Feb	SWISS
25 Feb - 03 Mar	British Airways	direct
24 Feb - 07 Mar	Delta
11 Feb - 18 Feb	Lufthansa
07 Feb - 24 Feb	Air Canada
11 Feb - 19 Feb	KLM
08 Feb - 15 Feb	Lufthansa
11 Feb - 17 Feb	Lufthansa
07 Feb - 16 Feb	Air Canada
18 Feb - 27 Feb	British Airways	direct
15 Feb - 23 Feb	Air Canada
16 Feb - 16 Mar	Aer Lingus
09 Feb - 02 Mar	KLM	direct
28 Feb - 08 Mar	KLM	direct

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

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 February from 471€

Return flights