Cheap Flights from Seattle to London
Compare indicative cheapest fares from Seattle (SEA) to London (LHR) — currently from $278. Check airlines, flight times and the cheapest days to fly, then book with our travel partner.
Search live Seattle → London faresFares from
$278
Fastest trip
12h 55m
Airlines
2+ carriers
Cheapest Seattle to London fares right now
Fares are indicative (updated periodically) and confirmed on our partner’s site. We may earn a commission when you book through our links, at no extra cost to you.
Airlines flying Seattle to London
On the Seattle to London route you will typically find fares from UA, AS. Comparing a few carriers is the surest way to catch the cheapest flights, since the lowest fare shifts between airlines by the day.
Tips for the cheapest Seattle–London fare
- • Fly mid-week — Tuesday and Wednesday departures are usually cheapest.
- • Our data shows lower fares around November — target that window if you can.
- • Book a few weeks to two months ahead rather than last-minute.
- • Set a price alert and compare non-stop vs one-stop options.
Seattle to London flights — FAQs
How much is a cheap flight from Seattle to London?
Indicative fares from Seattle to London start from around $278 one-way. Prices change with the season and how far ahead you book — the cheapest deals we have on record for Seattle (SEA) to London (LHR) currently sit near $278.
Which airlines fly from Seattle to London?
Carriers offering fares on the Seattle to London route include UA, AS. Availability changes daily, so compare the live options below before you book.
How long is the flight from Seattle to London?
The quickest itineraries we see on Seattle to London take about 12h 55m. Times vary by airline and number of stops.
When is the cheapest time to fly from Seattle to London?
Our data currently shows the lowest Seattle–London fares around November. As a rule, mid-week departures (Tuesday and Wednesday) and booking a few weeks to a couple of months ahead give you the cheapest flights on this route. Set a price alert and stay flexible on dates to save the most.
Where can I book cheap flights from Seattle to London?
Compare the indicative cheapest fares below, then tap "Book" to complete your Seattle to London booking on our trusted travel partner's site. Fares shown are indicative and confirmed at checkout.