Cheapest one-way flights from Seattle to London in May from $345

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

One-Way flights

02 May Alaska Airlines
03 May Alaska Airlines
18 May Icelandair
30 May Air Canada
08 May jetBlue
17 May Icelandair
31 May Alaska Airlines
07 May WestJet
15 May Icelandair
13 May British Airways direct

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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