$222 Find Cheap Flights from Seattle to the United Kingdom - Compare and Save

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 7/14. 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.
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Cheap Flights from Seattle to the United Kingdom

Cheapest round-trip prices found by our users on KAYAK in the last 72 hours
London
London1 stop$690
Edinburgh
Edinburgh2 stops$611
Manchester
Manchester3 stops$647
Birmingham
Birmingham3 stops$737
Belfast
Belfast1 stop$885
Inverness
Inverness1 stop$810
Bristol
Bristol3 stops$747
Aberdeen
Aberdeen1 stop$871
Leeds
Leeds3 stops$940
Liverpool
Liverpool1 stop$818
Cardiff
Cardiff3 stops$975
Newquay
Newquay2 stops$998
Grimsby
Grimsby1 stop$1,119
London
London1 stop$690
Edinburgh
Edinburgh2 stops$611
Manchester
Manchester3 stops$647
Birmingham
Birmingham3 stops$737
Belfast
Belfast1 stop$885
Inverness
Inverness1 stop$810
Bristol
Bristol3 stops$747
Aberdeen
Aberdeen1 stop$871
Leeds
Leeds3 stops$940
Liverpool
Liverpool1 stop$818
Cardiff
Cardiff3 stops$975
Newquay
Newquay2 stops$998
Grimsby
Grimsby1 stop$1,119

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 round-trip 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 round-trip flight deals from Seattle to the United Kingdom

Sun, Aug 16 - Sun, Aug 23
Multiple Airlines Logo
3:40 pm - 12:25 am
SEA
-
EDI
24h 45m
2 stops
Multiple Airlines Logo
8:40 pm - 11:45 am
EDI
-
SEA
23h 05m
2 stops
$611Multiple Airlines
Mon, Aug 17 - Tue, Aug 25
Multiple Airlines Logo
11:25 pm - 12:35 am
SEA
-
EDI
17h 10m
2 stops
Multiple Airlines Logo
8:15 pm - 11:45 am
EDI
-
SEA
23h 30m
2 stops
$613Multiple Airlines
Sun, Dec 13 - Wed, Dec 30
Icelandair Logo
2:35 pm - 10:55 am
SEA
-
LGW
12h 20m
1 stop
Icelandair Logo
11:55 am - 5:00 pm
LGW
-
SEA
13h 05m
1 stop
$690Icelandair
Tue, Dec 8 - Tue, Dec 29
Icelandair Logo
2:35 pm - 10:55 am
SEA
-
LGW
12h 20m
1 stop
Icelandair Logo
11:55 am - 5:00 pm
LGW
-
SEA
13h 05m
1 stop
$696Icelandair
Tue, Sep 22 - Fri, Oct 9
British Airways Logo
1:30 pm - 2:25 pm
SEA
-
INV
16h 55m
1 stop
British Airways Logo
10:25 am - 6:25 pm
INV
-
SEA
16h 00m
1 stop
$810British Airways
Sun, Aug 16 - Wed, Aug 26
British Airways Logo
1:30 pm - 10:15 am
SEA
-
INV
12h 45m
1 stop
British Airways Logo
10:35 am - 6:25 pm
INV
-
SEA
15h 50m
1 stop
$811British Airways
Sun, Aug 16 - Mon, Aug 24
Aer Lingus Logo
7:10 pm - 7:30 pm
SEA
-
SOU
16h 20m
1 stop
Aer Lingus Logo
9:20 am - 5:10 pm
SOU
-
SEA
15h 50m
1 stop
$962Aer Lingus
Thu, Aug 13 - Thu, Aug 20
Aer Lingus Logo
7:10 pm - 7:30 pm
SEA
-
SOU
16h 20m
1 stop
Aer Lingus Logo
9:20 am - 5:10 pm
SOU
-
SEA
15h 50m
1 stop
$974Aer Lingus
Sun, Nov 29 - Tue, Dec 8
Delta Logo
2:35 pm - 8:10 am
SEA
-
SOU
33h 35m
1 stop
Delta Logo
5:30 pm - 11:50 am
SOU
-
SEA
26h 20m
1 stop
$1,028Delta
Mon, Nov 30 - Tue, Dec 8
Delta Logo
5:45 am - 5:00 pm
SEA
-
SOU
27h 15m
2 stops
Delta Logo
5:30 pm - 11:50 am
SOU
-
SEA
26h 20m
1 stop
$1,033Delta
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 5 days was to London, at $855 round-trip. 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 5 days was $855.

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

The average price for all round-trip flights from Seattle to the United Kingdom depending on the time of departure, clicked by users on KAYAK in the last 2 weeks.

The cheapest time of day to fly to the United Kingdom is generally in the afternoon, when round-trip flights cost $868 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 at night, which is peak travel time and where the average cost of a ticket is $898.

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

The average round-trip price for all non-stop flights, flights with one layover, and flights with two layovers for the route found by users searching on KAYAK in the last 2 weeks.

No, with an average price for the route of $1,022, 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 $320 (return) on average. On the other hand, the most expensive months are February and June, when the average cost of round-trip tickets is $2,535 and $1,226 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.

Your flight ticket price will generally be cheaper if you fly to United Kingdom on a Wednesday and more expensive on a Friday. On your return trip to Seattle, you should consider flying back on a Tuesday, and avoid Fridays for better 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 the flight from Seattle to the United Kingdom, you should book around 2 weeks before departure, which saves you about 16% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 10 weeks before departure.

Good to know

Low seasonJanuary
Cheapest flight$222
Best time to beat the crowds with an average 12% drop in price.
Most popular time to fly and prices are also 6% lower on average.
Flight from Seattle to Glasgow

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

Insights shared by verified travelers who flew the route from Seattle to the United Kingdom 
MichaelFlew with Delta
SEA
-
LHR
May 2026
We like Delta, Alaska and American. Be prepared for a bit of a trek from your arrival gate to Customs and outside services. Heathrow doesn't rank high on my list of major airports.
Verified travelerFlew with American Airlines
SEA
-
LHR
Apr 2026
Heathrow is too gigantic to have less than 2 hours of layover time.
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 travelers 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 round-trip 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.

Top tips for finding cheap flights to the United Kingdom

  • Looking for a cheap flight? 25% of our users found tickets from Seattle to the following destinations at these prices or less: London $408 one-way - $974 round-trip

Reviews of the top 5 airlines serving 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.
7.8
DeltaOverall score based on 8453 reviews
7.8Comfort
7.2Food
8.1Boarding
8.5Crew
7.8Entertainment
Airline reviews

My flight was delayed by 4 hours in 30 minute increments. The gate agents were amazing but the communication was not. We were told that there was a maintenance issue but they didn't know what it was. That didn't inspire confidence. Then they said they found it and it was fixed and the pilot just needed to sign off. Then the pilot needed to talk to the other pilot from the arriving flight and we'd be fine. Then we were waiting for the pilot to call back. Then the maintenance issue wasn't fixed. Then they decided we were getting a new plane (why didn't they decide this earlier??). Fine. But then they announced we were changing gates AND terminals. And we were boarding in 20 minutes. So we all had to run to the new terminal gate. We could have taken off at that time, but we then had to wait for all the people who rebooked on a different flight to book this flight again. That took 30+ minutes because there was only one gate agent. When everyone ditched this flight, I saw it as an opportunity to upgrade to comfort. Delta, the greedy jerks they are, charged me $121. After their delay, their fault, their issues, couldn't even discount an upgrade. They only handed out $12 meal vouchers for the delay. I can't even get a snack from starbucks for that.

2.0 MediocreBlake, Jun 2026
SEA - BOS
Read more Delta reviews

My flight was delayed by 4 hours in 30 minute increments. The gate agents were amazing but the communication was not. We were told that there was a maintenance issue but they didn't know what it was. That didn't inspire confidence. Then they said they found it and it was fixed and the pilot just needed to sign off. Then the pilot needed to talk to the other pilot from the arriving flight and we'd be fine. Then we were waiting for the pilot to call back. Then the maintenance issue wasn't fixed. Then they decided we were getting a new plane (why didn't they decide this earlier??). Fine. But then they announced we were changing gates AND terminals. And we were boarding in 20 minutes. So we all had to run to the new terminal gate. We could have taken off at that time, but we then had to wait for all the people who rebooked on a different flight to book this flight again. That took 30+ minutes because there was only one gate agent. When everyone ditched this flight, I saw it as an opportunity to upgrade to comfort. Delta, the greedy jerks they are, charged me $121. After their delay, their fault, their issues, couldn't even discount an upgrade. They only handed out $12 meal vouchers for the delay. I can't even get a snack from starbucks for that.

Love me some Delta. One of the few airlines to recognize and support veterans. Easy boarding, flight was on time and arrived early and the flight attendants were excellent on this flight.

We sat on the runway for over an hour before departure. That was unwelcome.

The Boarding process was great. Particularly since my wife and I require assistance. The flight attendants were amazing. We travel frequently; they honestly were a cut above. 😀

Crew was nice, meal was good. Entertainment had to be rebooted 3 times and still did not work. Turns out there was residue on screen, it needed to be cleaned to prevent the touchscreen buttons from continuously activating. I had entertainment for the last 45 minutes of a 5 hour 45 minute flight. Really unacceptable for first class. Flight attendent indicated your cleaning solution creates this problem. Seems as if this is widely known, you should be using a different product or cleaning better. Really really disappointing which simply added to the wi fi on your planes with reliably never ever works.

Snacks and included beverages were appreciated. Boarding went smoothly. Plenty of overhead bin space. Seats get very uncomfortable after a couple of hours. After waiting 10 painful minutes for my walker, a very nice Delta guest agent pushed me in a wheelchair to the gate. It was finally delivered to me after another 15 minutes . Our checked bag was on the carousel long b4 I was able to retrieve it. Fortunately it was still there but somewhere along the way the straps we used to secure it were removed and and were not reattached. Wish I had made note of the agents name.

The cabin temperature was nice and cool. The wifi was not working.

Could not get my connecting flight boarding pass until four hrs before departure! Ver annoying especially since the staff could not explain why!

First flight out and was 85 minutes delayed. Notification came out way too late

The crew members were great. The food was good. Entertainment was average - Could use a wider and better selections of movies and series.

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

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

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 crew was excellent as ever on Virgin. The special meal was poor unfortunately. More significantly when we arrived at Manchester Airport there was no air bridge provided and we had to exit the plane down a rickety stair case. This is unacceptable for a transatlantic flight. Whilst I understand that this is the airport’s fault at the end of the day the airline is responsible for our transportation and needs to do something.

Super friendly and helpful staff, from check-in desk to cabin crew.

Good overall. Cannot fault the airlines. I have had better entertainment systems before ie ice in Emirates but it was not too bad. Food was decent and staff were friendly.

Miami airport needs more thorough signage. It was a long walk from my transport point to the check in desk,

Flight took off an hour late. Had to stay on the tarmac for half an hour after landing. Both annoying.

The crew was very good. However, the equipment was a bit dated. Some of the electronics were not working. To top it, three bags didn’t arrive with me. Two of them were delivered a day later. I’m still waiting for the third bag, I was so looking forward to this virgin Atlantic flight, but, I am disappointed.

i saved my points for more than 10 years in anticipation of treating myself to an upper class fight to and from london on virgin atlantic. i was shocked to find what you consider “upper class” on the dreamliner. it was, at best, a mediocre business class accommodation. it was tight and not that comfortable, with nearly no personal storage. everything was cramped and just generally disappointing. once i lucked into a 1st class upgrade to europe on lufthansa - a magical experience that found me reluctant to sleep, lest i deprive myself the joy of their setup. i expected something similar from virgin atlantic, but i could not have been more wrong. it will be the same arrangement on my flight home, but at least i know what (not) to expect. to be clear, this is only in reaction to the physical accommodations. your people were, and always are fantastic.

Air Lingus was in no hurry to get us on the plane as sat at the gate a long time before they boarded us. Then they leave us on the tarmac for an hour. They were no help to let me know what I needed to do to get home. I had to navigate London Heathrow with 0 help from them.

There was a 6h delay with limited updates . When we got to Manchester the bus took ages to get to arrivals and we missed our train, dinner reservation. Basically lost a whole day due to arrivals Lingus!!

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

Amenity kits were never handed out. There was zero friendliness and assistance by crew. Food was uneatable. One drink was offered and no wine, with dinner or before or after. Cocktails and beverages were not encouraged and when I asked for water, none was given. Poorest, most cramped business class flight I’ve ever been on.

I fly to the USA every 6wks on Ave and 99% of the time I fly Aer Lingus. If I fly BA I’m always disappointed. My only criticism is the food. I’m vegan and over the last year it’s got slightly better these last couple of flights but on the whole it’s not good! Salad and fruit salad for breakfast and that’s also the starter and desert for the lunch/dinner and the main is usually rice with fried veg 😳the pasta is pretty good though. That’s been the last 2 meals…. Everything else is fantastic.

The flight was half full and I presume that the next few days are even less busy not sure why they are still charging a premium to change a flight.

Aer Lingus doesn't have plug ins for devices at each seat. They also did not give me a dairy free meal as requested and confirmed by staff. It was as if I had not requested anything. Otherwise, they were great!

Pretty darn good. Food was typical airline food. Not anyone’s favorite.

The family sitting beside me had a one year old constantly crying and another kid kicking my chair. I understand it’s nothing the airlines could do or it’s fault

The seating area was small and uncomfortable. The person in front of me put her seat back and my area got even smaller!!

Crew was very friendly. Need lay flat beds! More snacks

Good. Rxception is the Entertainment - movies and TV shows all out of date…

I had no idea that my ticket only paid for my right to get on the plane. They charged me $130 for my carry-on bag because it was 1 inch too big she claimed but it wasn’t! Then they wanted another fee for everything. I had no idea that Icelandair had changed to such a bargain basement airline. I was very disappointed.

Screen didn't work, and neither did the button to tilt the seat even though the seat was comfortable

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.

Seat was hard and uncomfortable and the temperature too warm and uncomfortable.

Everything was good. Only issue comes from being vegan and flying. The food options are super limited.

Overall good for an economy fare. IMO the movie selection could be improved. Great that you can now connect bluetooth headphones to the entertainment system.

7 hours 15 min flight from SEA to Iceland with no inflight entertainment and no power to charge your own devices, also no meal service, not even any snacks/cookies. You have to buy food and the options are extremely limited (i.e. ham and cheese sandwich and spicy cup noodles). I didn't think Iceland air was a budget airline, maybe I was wrong, the cost of the ticket didn't feel like it though.

Very nice flight, easy connections in Keflavík, and friendly crew.

Meh. Lived the seat. The entertainment unit did not work and had to be reset 3 times. Service was SLOW taking over 90 min to be served. Crew forgot about my meal. Chicken was dry and almost inedible.

Flying on the Boeing 787 from Seattle to London was everything that I expected. Every thing was great.

Moved me away from my family and refused to fix it.

Connection at Hethrow was horrible..We couldn't get out of the plane for an hour as they were buying people to the airport and there were not enough busses. We had 2 and half hf between flights so it was very tight. After departing plane we had to go thru security again. People with less time in between connections missed their flights

Captain sick. Unable to get replacement so delayed me 30 hours, many others delayed 54 hours. TOTALLY DESTROYED ALL MY PLANS, including lost my rental car which would now cost over 5 times what I paid so stuck with buses n trains... lost hotel reservations.... HORRIBLE!!!

The BA business class cabin is excellent,very comfortable for sleeping but the service could be improved.

The flight from Seattle was delayed, which made me miss my connection to Florence. I was re-booked NINE HOURS LATER!!! That’s basically a vacation day lost. British Airways needs to partner with other airlines when possible to get a more realistic travel time, if delays occur. I realize there aren’t many flights to Florence from London, so I would book differently were I to return. The actual flight from Seattle was very comfortable and the crew was great, no faults there. I enjoy British Airways, this was an anomaly.

Could have done with a 2nd round of drinks even if it was only to distribute bottled water

The second leg of my flight unexpectedly got canceled. I was stuck at the airport for the whole day and instead of flying out that morning I flew out in the evening. For some of my fellow passengers it was the second cancellation and their original flight was supposed to go out the day before. There was no reason given though getting rebooked was quick even though I would have preferred if I would have been on one of the earlier flights that day. Compensation was a £10 voucher for some food at the airport. I eventually arrived without further incident but but due to the cancellation, it was one of my more frustrating travels of my life.

Due to a cyber attack at the SeaTac airport ALL of the airport computers at the airport were down. This seriously impacted every airline at the airport and the resulted in our flight leaving a hour later than scheduled. This delay caused us to miss our connecting flight from Heathrow to Edinburgh. I was amazed to have British Airways staff meet us at the gate as we left our flight. They quickly provided us with new boarding passes for a flight going to Edinburgh later the same day. Problems sometimes happen but they handled the situation in first class style.

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

Information on your arrival and departure airports