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

Return flights

02 Jun - 09 Jun	Icelandair
13 Jun - 20 Jun	Icelandair
06 Jun - 26 Jul	Icelandair
04 Jun - 27 Jun	Icelandair
01 Jun - 27 Jun	Icelandair
27 Jun - 05 Jul	Alaska Airlines
17 Jun - 11 Jul	Icelandair
05 Jun - 27 Jun	Alaska Airlines
23 Jun - 30 Jun	Icelandair
26 Jun - 04 Jul	Alaska Airlines
14 Jun - 04 Jul	Alaska Airlines
19 Jun - 11 Jul	Alaska Airlines
25 Jun - 18 Jul	Alaska Airlines
22 Jun - 18 Jul	WestJet
21 Jun - 11 Jul	Icelandair

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 $729

Return flights