Cheapest return flights from Seattle to London in April from 527€

Best time to book flights for Seattle (SEA) to London (LHR) flights at AirHint

AirHint found the following cheapest return flights from Seattle (SEA) to London (LHR) in April 2025 (see full year).

Return flights

25 Apr - 27 Apr United
07 Apr - 28 Apr Icelandair
25 Apr - 28 Apr Icelandair
01 Apr - 30 Apr Icelandair
08 Apr - 22 Apr Iberia direct
01 Apr - 29 Apr Iberia direct
20 Apr - 30 Apr Iberia direct
15 Apr - 24 Apr Iberia direct
15 Apr - 22 Apr Iberia direct
01 Apr - 30 Apr Iberia direct
25 Apr - 05 May Icelandair
24 Apr - 03 May Air Canada
22 Apr - 06 May Air France
29 Apr - 06 May Delta
30 Apr - 27 May Icelandair
24 Apr - 03 May Iberia direct
22 Apr - 30 May Delta
20 Apr - 28 May Delta
20 Apr - 28 May Virgin Atlantic direct

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

Skyscanner

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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