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

Return flights

01 Feb - 08 Feb	Icelandair
03 Feb - 07 Feb	Icelandair
03 Feb - 10 Feb	Icelandair
17 Feb - 24 Feb	Icelandair
24 Feb - 03 Mar	Icelandair
27 Feb - 06 Mar	Icelandair
16 Feb - 02 Mar	Icelandair
28 Feb - 17 Mar	Icelandair
07 Feb - 14 Feb	Icelandair
11 Feb - 18 Feb	Lufthansa
18 Feb - 27 Feb	Lufthansa
06 Feb - 14 Feb	Lufthansa
09 Feb - 16 Feb	Lufthansa
19 Feb - 28 Feb	Lufthansa
21 Feb - 07 Mar	Delta
28 Feb - 17 Mar	British Airways	direct
16 Feb - 02 Mar	Virgin Atlantic	direct
21 Feb - 07 Mar	British Airways	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 426€

Return flights