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

Return flights

11 Jun - 18 Jun	Icelandair
02 Jun - 09 Jun	Icelandair
10 Jun - 30 Jun	Icelandair
05 Jun - 13 Jun	Icelandair
14 Jun - 24 Jun	Icelandair
05 Jun - 08 Jun	Scandinavian Airlines
15 Jun - 18 Jun	SWISS
25 Jun - 02 Jul	Icelandair
07 Jun - 20 Jun	Icelandair
20 Jun - 29 Jun	Icelandair
01 Jun - 29 Jun	Icelandair
29 Jun - 13 Jul	Icelandair
04 Jun - 04 Jul	WestJet
22 Jun - 01 Jul	SWISS
12 Jun - 28 Jul	Icelandair
24 Jun - 08 Jul	Icelandair
19 Jun - 03 Jul	Finnair
24 Jun - 09 Jul	Icelandair
26 Jun - 18 Jul	Aer Lingus
26 Jun - 03 Jul	Air Canada

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

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 June from $713

Return flights