Cheapest return flights from Seattle to London in March from $495

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

Return flights

16 Mar - 20 Mar Icelandair
05 Mar - 12 Mar Icelandair
16 Mar - 11 Apr Icelandair
05 Mar - 12 Mar British Airways direct
21 Mar - 29 Mar Air Canada
16 Mar - 11 Apr British Airways direct
20 Mar - 28 Mar Icelandair
20 Mar - 28 Mar American Airlines direct
21 Mar - 30 Mar British Airways direct
14 Mar - 04 Apr Icelandair
14 Mar - 04 Apr British Airways direct
11 Mar - 20 Mar Aer Lingus direct
21 Mar - 29 Mar Virgin Atlantic direct
28 Mar - 11 Apr Aer Lingus direct
16 Mar - 20 Mar British Airways direct

Also check the deals for one-way flights from Seattle to London in March.

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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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