£146 Find Cheap Flights from Seattle to the United Kingdom

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Seattle to the United Kingdom departing on 19/5. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult
1 adult, Economy, 0 bags

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Cheap Flights from Seattle to the United Kingdom

Cheapest return prices found by our users on KAYAK in the last 72 hours
London
London1 stop£404
Manchester
Manchester1 stop£370
Edinburgh
Edinburgh1 stop£402
Birmingham
Birmingham2 stops£456
Bristol
Bristol1 stop£714
Aberdeen
Aberdeen2 stops£523
Liverpool
Liverpool1 stop£626
Leeds
Leeds1 stop£487
Inverness
Inverness2 stops£423
London
London1 stop£404
Manchester
Manchester1 stop£370
Edinburgh
Edinburgh1 stop£402
Birmingham
Birmingham2 stops£456
Bristol
Bristol1 stop£714
Aberdeen
Aberdeen2 stops£523
Liverpool
Liverpool1 stop£626
Leeds
Leeds1 stop£487
Inverness
Inverness2 stops£423

Book Cheap Seattle to the United Kingdom Plane Tickets

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for return flights from Seattle to the United Kingdom that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent return flight deals from Seattle to the United Kingdom

Tue, 7 Apr - Tue, 28 Apr
Icelandair Logo
19:00 - 13:25
SEA
-
GLA
10h 25m
1 stop
Icelandair Logo
14:20 - 20:40
GLA
-
SEA
14h 20m
1 stop
£367Icelandair
Mon, 20 Apr - Mon, 27 Apr
Icelandair Logo
19:00 - 13:25
SEA
-
GLA
10h 25m
1 stop
Icelandair Logo
14:20 - 20:40
GLA
-
SEA
14h 20m
1 stop
£368Icelandair
Tue, 21 Apr - Tue, 28 Apr
Multiple Airlines Logo
15:40 - 11:40
SEA
-
MAN
12h 00m
1 stop
Multiple Airlines Logo
22:45 - 19:23
MAN
-
SEA
28h 38m
2 stops
£370Multiple Airlines
Tue, 21 Apr - Tue, 28 Apr
Multiple Airlines Logo
15:40 - 11:40
SEA
-
MAN
12h 00m
1 stop
Multiple Airlines Logo
22:45 - 09:35
MAN
-
SEA
42h 50m
3 stops
£390Multiple Airlines
Sun, 19 Apr - Thu, 30 Apr
British Airways Logo
20:20 - 18:00
SEA
-
EDI
13h 40m
1 stop
British Airways Logo
11:25 - 21:23
EDI
-
SEA
17h 58m
1 stop
£461British Airways
Tue, 24 Mar - Tue, 31 Mar
KLM Logo
16:05 - 16:35
SEA
-
MAN
17h 30m
1 stop
KLM Logo
20:50 - 16:30
MAN
-
SEA
27h 40m
1 stop
£468KLM
Mon, 30 Mar - Wed, 8 Apr
KLM Logo
13:45 - 09:30
SEA
-
LCY
11h 45m
1 stop
KLM Logo
10:00 - 16:30
LCY
-
SEA
14h 30m
1 stop
£495KLM
Tue, 21 Apr - Tue, 28 Apr
Virgin Atlantic Logo
13:45 - 16:40
SEA
-
LCY
18h 55m
1 stop
Virgin Atlantic Logo
09:20 - 20:25
LCY
-
SEA
19h 05m
2 stops
£504Virgin Atlantic
Mon, 30 Mar - Wed, 8 Apr
Virgin Atlantic Logo
13:45 - 17:20
SEA
-
LCY
19h 35m
1 stop
Virgin Atlantic Logo
10:00 - 22:10
LCY
-
SEA
20h 10m
2 stops
£505Virgin Atlantic
Thu, 16 Apr - Sun, 26 Apr
British Airways Logo
13:35 - 10:10
SEA
-
BHD
12h 35m
1 stop
British Airways Logo
06:30 - 11:35
BHD
-
SEA
13h 05m
1 stop
£546British Airways
Booking Insights

KAYAK's insights & trends for Seattle to the United Kingdom flights

Get data-powered insights and trends into flights from Seattle to the United Kingdom to help you find the cheapest flights, the best time to fly and much more.

What is the cheapest Seattle to the United Kingdom flight route?

Data is based on round-trip flight searches on KAYAK over the past month.

The cheapest ticket to the United Kingdom from Seattle found in the last 72 hours was to London, at £451 return. The most popular route is from Seattle (SEA) to London Heathrow Airport (LHR), and the cheapest round-trip airline ticket found on this route in the last 72 hours was £451.

Can I save money by flying with a stopover from Seattle to the United Kingdom?

The average return price for all direct flights, flights with one stopover, and flights with two stopovers for the route found by users searching on KAYAK in the last 2 weeks.

No, with an average price for the route of £584, prices are generally cheapest when you fly direct.

What is the cheapest month to fly from Seattle to the United Kingdom?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from Seattle to the United Kingdom, removes the top 0.1% to account for outliers, and then takes the median of all values for each month.

The cheapest month for flights from Seattle to the United Kingdom is January, when tickets cost £476 (return) on average. On the other hand, the most expensive months are June and December, when the average cost of return tickets is £734 and £720 respectively.

What’s the cheapest day of the week to fly from Seattle to United Kingdom?

The average price of all round-trip flights from Seattle to the United Kingdom clicked on KAYAK for each day over the last 12 months.

If your flying dates are flexible, you should consider flying to United Kingdom on a Tuesday, as we generally find the cheapest rates on that day for this route. On the other hand, Sunday is the most expensive day to fly from Seattle to United Kingdom. For your return ticket, we recommend flying on a Wednesday and avoiding Sundays for the best deals.

How far in advance should I book a flight from Seattle to the United Kingdom?

To calculate weekly average prices, KAYAK takes all prices for each week before departure over the last year for round-trip flights from Seattle to the United Kingdom, removes the top 0.1% to account for outliers, and then takes the average of all the values for each week.

To get a below-average price on a flight from Seattle to the United Kingdom, you should book around 2 weeks before departure, which saves you about 15% compared to booking last-minute. For the absolute cheapest price, our data suggests you should book 5 weeks before departure.

Good to know - Cheap tickets from Seattle to the United Kingdom

Low seasonJanuary
Cheapest flight£146
Best time to beat the crowds (12% less expensive on average)
Most popular time to fly and prices are also 4% lower on average.
Flight from Seattle to Manchester

Flights from Seattle to the United Kingdom: the best tips from KAYAK users

Insights shared by verified travellers who flew the route from Seattle to the United Kingdom 
Verified travelerFlew with British Airways
SEA
-
LHR
Apr 2025
Make sure you have plenty of time between flights if you are delayed.
Verified travelerFlew with British Airways
SEA
-
LHR
Feb 2025
Don’t take a flight if you sick, or if you have no choice prepare to stay covered with mask throughout the flight
Verified travelerFlew with British Airways
SEA
-
LHR
Apr 2024
Bring a sack lunch -- airport food was very expensive.

FAQs - booking United Kingdom flights

  • How does KAYAK find such low prices on flights from Seattle to the United Kingdom?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Seattle to the United Kingdom.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Seattle to the United Kingdom?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight from Seattle to the United Kingdom is likely to change within 7 days, so travellers know whether to wait or book now.

  • What is the Hacker Fare option on flights from Seattle to the United Kingdom?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional return ticket. You could then fly from Seattle to the United Kingdom with an airline and back with another airline.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Seattle to the United Kingdom?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying from Seattle to the United Kingdom up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

  • What is the cheapest time of day to fly to the United Kingdom?

    The cheapest time of day to fly to the United Kingdom is generally in the afternoon, when retur flights cost £528 on average. Morning departures are around 100% cheaper than evening flights, on average. The most expensive time of day to fly to the United Kingdom is generally in the evening, which is peak travel time and where the average cost of a ticket is £609.

Top tips for finding a cheap flight from Seattle to the United Kingdom

  • Looking for a cheap flight from Seattle to the United Kingdom? 25% of our users found tickets from Seattle to the United Kingdom for the following prices or less: London £329 one-way - £492 round-trip

Reviews of the top 5 airlines flying from Seattle to the United Kingdom

 
Need help choosing which airline to fly with from Seattle to the United Kingdom? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
7.7
KLMOverall score based on 1457 reviews
7.8Boarding
7.3Food
7.6Comfort
8.4Crew
7.1Entertainment
Airline reviews

Empty seats next to me - wish it had been for a longer flight!!

8.0 ExcellentAnonymous, Feb 2026
AMS - NCL
Read more KLM reviews

Empty seats next to me - wish it had been for a longer flight!!

I’m grateful for the KLM Air France shuttle bus service to Ottawa. However due to construction and other issues related to the chaotic Uber pickup system at YUL, it’s a challenge to find the Kelios bus service to Ottawa. The signs are not clear or even available. No staff to guide passengers. It’s a stressful experience.

They forgot to serve food and the crew was very unfriendly. Never experienced such a bad KLM flight. Usually fly from Toronto. New York was different.

Couldn’t get boarding pass in SLC even with help from a redcoat, so had to find a desk in AMS to get boarding pass. Technical problems so not sure why. Very inconvenient. The KLM app is not as user friendly as most apps. Also had to wait almost an hour on the tarmac for a fuel truck, which caused us to miss a connecting bus in LUX.

The immigration hall in Amsterdam was understaffed, so passport checking was slower than it should be for a major airport. They need to get the automatic readers up and running for non EU passport holders. Waiting in line after a long flight feels a bit abusive.

Over 1 Hr delay. No APU so no AC on ground. Plane was hot during boarding and then they closed the doors over 20 minutes before engine start so interior of plane was steamy hot and stuffy. Could have been helped by opening doors until ready to depart.

First of all we couldn’t check in online, then we learn at the airport we were on stand by for KLM’s mistake of overbooking. The seats were not comfy at all. Our luggage got lost.

Ad experience - been flying many years with them but they are losing out to other carriers with their service and bagage / seating policy. My 2 12-yo kids were not placed with the parent. Absurdity.

KLM remains a quality flag carrier airline which maintains its standards whilst all their competitors are lowering theirs.

My flight was delayed by 6 hours then I missed BOTH of my connecting flights, I then had to stay in the AIRPORT at JFK because soooooo many people also suffered from missing flights and there was no hotels available. I would like to be compensated for this experience! I had to stay in the airport for over 16 hours!

Food has been disappointing in both legs of flight to india

Great staff great experience, made a 2 hour delay very bearable

Great staff, great experience, made a 2 hour delay very bearable

Food was the worst I’ve had on a VA flight. Normally it’s a lot better

I was my pleasure to fly virgin on my birthday for my first solo trip ever 🫶🏼

These are one of the older seat arrangements facing away from the windows! Not particularly convenient sets. No storage spaces. NO COAT HANGING HOOKS. Inconvenient business class seat compared to any other airlines of similar class. Staff are excellent! Extremely professional, friendly. Food is good too.

Overall, flight was excellent but check in was very slow for Premium Economy. Economy queue was shorter but we weren't allowed to use it.

The staff was not very polite but the flight was very very nice and comfortable and the entertainment was great

Great crew - old style upper class seats on the older fleet now feels dated

Premium economy more comfortable than economy, but not by much. Did was awful, do not try the omelette. Flight crew were helpful. Flight was delayed by over an hour. Overall but bad, arrived safely and thank God.

Great. Has a problem with DOB. Fixed 4 us. Led to a 5 hour earlier flight to London!

Punctual, smooth flight. Crew excellent and cabin very clean. Paid for WiFi but once you close out you cannot get back in even if you paid for entire flight.

Flight crew was superb. Meal was one of the meals at altitude I’ve had

Canceled my flight couple hours before takeoff. They could not find a decent re-routing and refused to pay for when i subjected alternative with Lufthansa.

Seats a little to soft on the SFO DUB flight

Well, I think we left close to on time. Crew was “eh”.

Flight takeoff was delayed an hour, but arrival time was not updated at the same time as departure time, so those picking me up at the other end were not alerted to the change in my arrival.

Seats are terribly cramped. I’m only 5’2” and my knees were practically in my face. No room to put a normal size bag under the seat and when the person in front of you reclined their seat your tray table was in your lap. This is the airline’s way of cramming more seats into the plane to make more money. I’ll think twice about taking Aer Lingus again since there are a few other options from Boston to the Emerald Isle.

Couldn’t check In online, message was couldn’t check in until Sunday morning though plane left Saturday night. Checked in okay at airport but caused slot if stress.

Fast and sensible boarding was absolutely amazing. But extortionate wifi and seats that barely moved, making me unable to sleep, didn't do a lot of favors.

The staff was kind and helpful. There was no food, and you needed to bring your own earphones to use the entertainment, which I didn’t know.

They wouldn’t check in my luggage even though I had one checked bag prepaid. So I took my bag to the gate and tried to check it in there and two employees scolded me for bringing a large bag to the gate. I told them I was trying to check it in and that it was prepaid, and they said they couldn’t guarantee that it would arrive at my destination but they finally let me drop it off when boarding the plane and pick it up right after exiting the plane. There was no food, and there was no entertainment.

Overall satisfied and would fly with them again. They could improve the check-in efficiency at BOS, we got backed up because it seemed there were passengers requiring much more time for check in.

Delays at check-in, seemed like they were short ground staff at the time and some passengers needed extra processing.

Problems checking in both on the laptop and on the app. No free seating available at check-in as advertised - must pay for EVERY seat between $23 and $75. No way to cancel seat choice. App menus and site menus are not responsive, and some items are impossible to find. Crew and mobile assistance are friendly and helpful.

Food - Non-Existent. You pay for everything. It is strictly Pay-to-Play!

If there was a disclaimer regarding food service or lack thereof, l missed it. If l had known l would have prepared better. Same with transferring at Reykjavik. No information about disembarking via stairs into rain, slush and puddles deep enough to swallow a foot. After being treated to haute cuisine restaurants and warm inviting environment during the flight, the airport is, let’s be kind, disappointing. Plane was comfortable, Airbus, staff were welcoming enough. I would likely try the route again. Maybe have a night and day in Iceland. Maybe not.

Iceland air transfer was bad. They lost my luggage and I just received it 11/1

It was too cold in the plane my feet froze

Handling our luggage was the biggest issue - they lost it and we got it almost 3 days later. Really threw off the beginning of our trip and we really had to change our itinerary accordingly.

They had us seating down for one hour just waiting on the plane

Flying with BA is always a good experience—even in economy class. It is better if in business and first class. Timely, breeze through security and timely connections

We waited at BOS at the gate for an hour and couldn’t get a drink or anything. Once in the air the service, food and ride was excellent.

My enetertainmnet screen was broken. Lost my bags. Almost missed my flight do to connection issues with (despite a request) ZERO help from crew. Food was edible. Potatoes pretty good even

The issue was not with BA it was with the link yoiu sent fopr booking the flight

Loved the boarding option from Business class lounge, experience on flight was excellent, plenty of good food choices

The airline was not clear about a new departure time so we got to the airport early anyway. The flight left early which was great because of weather. The check in process was very easy and staff were friendly and helpful. The crew was great and our flight was very good.

Awful it always is unfortunately is the only way to fly direct to london

I travelled in business class and was disappointed by lack of service, curt and borderline rude time of the crew and to top it off, all of my luggage was delayed. It was like pulling teeth to even report the missing luggage and recover it the next day from the airport.

Boarding was poor. All groups called immediately one after the other resulting in a long queue in the jetty/jet bridge. Seats were very hard and and did not recline on a 4.5 hour flight. No food was available. Plane was cold. There was no entertainment.

Everything you need to know for your flight from Seattle to the United Kingdom

Information on your arrival and departure airports