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

Return flights

04 Jun - 15 Jun	Icelandair
06 Jun - 13 Jun	Icelandair
10 Jun - 17 Jun	Icelandair
02 Jun - 09 Jun	Icelandair
06 Jun - 20 Jun	Icelandair
09 Jun - 14 Jun	Icelandair
01 Jun - 30 Jun	Icelandair
23 Jun - 10 Jul	Icelandair
26 Jun - 05 Jul	Icelandair
09 Jun - 10 Jul	Icelandair
27 Jun - 04 Jul	Icelandair
05 Jun - 28 Jun	Icelandair
25 Jun - 03 Jul	Icelandair
22 Jun - 04 Jul	Icelandair
24 Jun - 09 Jul	Icelandair
24 Jun - 08 Jul	Icelandair
16 Jun - 22 Jun	Icelandair
30 Jun - 11 Jul	Icelandair
30 Jun - 18 Jul	Icelandair
09 Jun - 23 Jun	Iberia

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 $785

Return flights