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

Return flights

04 Jun - 11 Jun	Icelandair
09 Jun - 16 Jun	Icelandair
01 Jun - 15 Jun	Icelandair
25 Jun - 02 Jul	Icelandair
13 Jun - 27 Jun	Icelandair
18 Jun - 23 Jun	Icelandair
23 Jun - 30 Jun	Icelandair
19 Jun - 26 Jun	Icelandair
24 Jun - 01 Jul	Icelandair
03 Jun - 01 Jul	Icelandair
17 Jun - 22 Jun	Icelandair
24 Jun - 09 Jul	Aer Lingus
24 Jun - 08 Jul	Aer Lingus
09 Jun - 10 Jul	Aer Lingus
28 Jun - 05 Jul	Aer Lingus
27 Jun - 04 Jul	Scandinavian Airlines
26 Jun - 04 Jul	Scandinavian Airlines
09 Jun - 10 Jul	Virgin Atlantic	direct
04 Jun - 14 Jun	Delta
14 Jun - 21 Jun	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.

Book a cheap hotel in London

Cheap car rent in London

Cheapest return flights from Seattle to London in June from 705€

Return flights