Cheapest one-way flights from Seattle to London in May from $247

AirHint found the following cheapest one-way flights from Seattle (SEA) to London (LTN) in May 2026 (see full year).

One-Way flights

16 May Icelandair
15 May Icelandair
10 May Icelandair
19 May Air Canada
03 May Icelandair
14 May Icelandair
21 May Icelandair
22 May Icelandair
25 May Icelandair

Also check the deals for return flights from Seattle to London in May.

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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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