Seattle to London
Seattle to London is cheapest from January through March, all at 316 €. September, the most expensive month we measured, costs about 465 € more.
Seattle to London is 7,702 km flown direct. Every fare we measured came from WS.
That comes from pricing 295 departure dates across 11 months. Every figure below is a fare we measured on the day shown, not a live quote. When we have nothing fresh to say about a route, its page stops existing.
What is a good price from Seattle to London?
Anything at or below the quarter mark beats three in four of the 295 one-way fares we measured here. Above the median, wait or move the date.
seen 26 Sep 2026
How far ahead do the cheap fares sit?
When we measured, the cheapest quarter of fares sat between 54 and 136 days before departure, closer in than the market as a whole. The cheap fares were on nearer dates, not months away, when we looked.
a snapshot of where the cheap seats sat, seen 26 Sep 2026
Which day of the week is cheapest?
On average, Wednesday departures came out lowest and Saturday highest, a spread of about 116 €. The day matters less than the month here: pick the month first, then the day.