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

Return flights

09 Feb - 17 Feb	Icelandair
10 Feb - 17 Feb	Icelandair
03 Feb - 10 Feb	Icelandair
25 Feb - 04 Mar	Icelandair
28 Feb - 07 Mar	Icelandair
17 Feb - 16 Mar	Icelandair
18 Feb - 27 Feb	Icelandair
15 Feb - 05 Mar	Lufthansa
11 Feb - 24 Feb	Lufthansa
11 Feb - 15 Feb	Lufthansa
07 Feb - 14 Feb	Delta
08 Feb - 17 Feb	Delta
08 Feb - 17 Feb	British Airways	direct
18 Feb - 27 Feb	British Airways	direct
22 Feb - 01 Mar	Icelandair

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 $518

Return flights