LHR - SEA

$527 Find Cheap Flights from London Heathrow Airport to Seattle

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Heathrow to Seattle departing on 1/31. 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

KAYAK searches hundreds of travel sites at once for deals on flights to Seattle

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from London to Seattle, as well as popular online travel agencies
These are the airlines KAYAK users have selected most often from within our search results in flight searches from London to Seattle, as well as popular online travel agencies
Travelers love KAYAK
41.299.237 searches in the past 7 days on KAYAK

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Everything you should know

Cheapest round-trip
$600
Typical prices: $605-$818
Icelandair
Sun 2/1Sun 3/8
LHR - SEA • 1 stop
Cheapest non-stop
$666
Typical prices: $667-$905
Virgin Atlantic
Thu 3/5Tue 3/10
LHR - SEA • Non-stop
Our travelers' advice
AI-powered summary based on content written by travel experts. AI can make mistakes.
Virgin's Economy Delight includes extra legroom.
Heathrow can be overcrowded, so arrive early.
Expert advice
Expert advice
Expert advice
Expert advice
When to book
4 weeks
in advance
Our data shows that travelers who book at least 4 weeks in advance save around 21% compared to booking last minute.
Insights
Insights
Insights
Insights
When to travel
February
Cheapest • 19% price drop
August
Most popular
Good to know
Good to know
+1
+1
Good to know
Good to know
+1
Start a new search
KAYAK searches 100s of sites at once to find you the best travel deals.
We hope you love your trip to Seattle!
Flight Deals
Booking Insights
Expert advice
Flight Deals

Cheap Flights from Heathrow to Seattle (LHR-SEA)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Heathrow to Seattle 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 Heathrow to Seattle

Sun, Feb 1 - Sun, Mar 8
Icelandair Logo
12:15 pm - 5:00 pm
LHR
-
SEA
12h 45m1 stop
Icelandair Logo
3:35 pm - 10:50 am
SEA
-
LHR
12h 15m1 stop
$600Icelandair
Fri, Mar 20 - Wed, Apr 15
Icelandair Logo
12:15 pm - 6:00 pm
LHR
-
SEA
12h 45m1 stop
Icelandair Logo
3:40 pm - 11:55 am
SEA
-
LHR
12h 15m1 stop
$604Icelandair
Tue, Apr 7 - Thu, Apr 30
Icelandair Logo
9:25 pm - 8:40 pm
LHR
-
SEA
31h 15m1 stop
Icelandair Logo
7:00 pm - 8:20 pm
SEA
-
LHR
17h 20m1 stop
$611Icelandair
Wed, Feb 4 - Mon, Mar 2
Icelandair Logo
12:15 pm - 5:00 pm
LHR
-
SEA
12h 45m1 stop
Icelandair Logo
2:35 pm - 10:50 am
SEA
-
LHR
12h 15m1 stop
$612Icelandair
Wed, Feb 4 - Wed, Mar 4
Icelandair Logo
8:35 pm - 5:00 pm
LHR
-
SEA
28h 25m1 stop
Icelandair Logo
2:35 pm - 7:30 pm
SEA
-
LHR
20h 55m1 stop
$613Icelandair
Wed, Feb 11 - Thu, Feb 19
Icelandair Logo
12:15 pm - 5:00 pm
LHR
-
SEA
12h 45m1 stop
Icelandair Logo
2:35 pm - 10:50 am
SEA
-
LHR
12h 15m1 stop
$618Icelandair
Tue, Feb 10 - Thu, Feb 19
Icelandair Logo
12:15 pm - 5:00 pm
LHR
-
SEA
12h 45m1 stop
Icelandair Logo
2:35 pm - 10:50 am
SEA
-
LHR
12h 15m1 stop
$620Icelandair
Sat, Jan 17 - Fri, Jan 23
WestJet Logo
2:50 pm - 10:22 am
LHR
-
SEA
27h 32m2 stops
WestJet Logo
3:10 pm - 12:50 pm
SEA
-
LHR
13h 40m1 stop
$621WestJet
Thu, Feb 12 - Thu, Feb 19
Icelandair Logo
8:35 pm - 5:00 pm
LHR
-
SEA
28h 25m1 stop
Icelandair Logo
2:35 pm - 10:50 am
SEA
-
LHR
12h 15m1 stop
$622Icelandair
Wed, Apr 8 - Wed, Apr 15
Icelandair Logo
1:05 pm - 5:55 pm
LHR
-
SEA
12h 50m1 stop
Icelandair Logo
3:40 pm - 8:20 pm
SEA
-
LHR
20h 40m1 stop
$624Icelandair
Booking Insights

KAYAK's insights & trends for Heathrow to Seattle flights

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

How much is a round-trip flight from London Heathrow Airport to Seattle?

This analysis is based on the cheapest round-trip price found on KAYAK in the last 12 months by searching for a flight from London Heathrow Airport to Seattle departing in February.

What’s the cheapest day of the week to fly from London Heathrow Airport to Seattle?

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

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

What is the cheapest month to fly from London Heathrow Airport to Seattle?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from London Heathrow Airport to Seattle, 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 London Heathrow Airport to Seattle is February, where tickets cost $615 (return) on average. On the other hand, the most expensive months are July and December, where the average cost of round-trip tickets is $956 and $937 respectively.

Can I save money by flying with a layover from London Heathrow Airport to Seattle?

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.

Yes, flying with a layover may cost you more time, but you can also save money on the route, with a 2 stops layover the cheapest option at $826 on average.

How far in advance should I book a flight from London Heathrow Airport to Seattle?

To calculate weekly average prices, KAYAK takes all prices for each week before departure over the last year for round-trip flights from London Heathrow Airport to Seattle, 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 London Heathrow Airport to Seattle, you should book around 4 weeks before departure, which saves you about 21% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 9 weeks before departure.

Expert advice

Expert advice for your flight from Heathrow to Seattle

 
AI-powered summary based on content written by travel experts. AI can make mistakes.
KAYAK teamed up with top travel experts to share the best tips for your journey.
Airlines
Iberia

Iberia's business class offers all-aisle access and Wi-Fi for connectivity.


Iberia's Premium Economy offers 37-inch seat pitch and USB power outlets.

British Airways

Upgrade to premium economy for more space, priority boarding, and a bigger baggage allowance.


BA's premium economy offers seven extra inches of legroom, ideal for taller travelers.

Delta

Delta One Suites offer privacy with sliding doors, ideal for long-haul comfort.


Delta's Premium Select offers 38 inches of pitch and memory foam pillows.

Virgin Atlantic

Virgin's Upper Class offers fully flat beds and exclusive lounge access.


Virgin's Economy Delight includes extra legroom and priority boarding.

American Airlines

AA's Main Cabin Extra offers early boarding and complimentary drinks.


AA's Premium Economy includes upgraded seats and complimentary meals.

Airports
LHR

Heathrow can be overcrowded. Arrive two hours early for carry-on and longer if checking bags. Avoid peak times for a smoother experience.

SEA

Use the Link light rail for a cost-effective 40-minute trip from SEA to downtown Seattle, avoiding high ride-hailing fares.

Our travel experts
Marisa Garcia

Marisa Garcia

Expert on Iberia

Marisa Garcia

Marisa Garcia

Marisa knows planes inside and out, spending 16 years working on aircraft in hangars at airports around the world. She is an aviation industry expert, specialized in airline interiors and regulations. Ten years ago, she pivoted to journalism. She shares her insights in leading aviation, travel, and business publications and on her site FlightChic.

Read more
Duncan Madden

Duncan Madden

Expert on British Airways and LHR

Duncan Madden

Duncan Madden

Duncan is a freelance travel writer, copywriter and book author in constant search of travel stories and the perpetual sensation of being on holiday. He’s never happier than when on a dusty trail in search of empty waves or ducking under the piste tape in search of snowbound solitude. British born, living in Germany, but happiest heading for the horizon. His first book, Found in Translation, explores the etymologies and stories of country names around the world and is out now.

Read more
Stefanie Waldek

Stefanie Waldek

Expert on Delta

Stefanie Waldek

Stefanie Waldek

Stefanie Waldek is a freelance space, travel, and design writer based in Saratoga Springs, NY. Her words have appeared in Space.com, Travel + Leisure, Condé Nast Traveler, Architectural Digest, and House Beautiful, among other publications. An expert in aviation and expedition cruising, Stefanie is frequently up in the air or on the sea, likely en route to Antarctica or the Arctic.

Read more
Laura Ratliff

Laura Ratliff

Expert on Virgin Atlantic

Laura Ratliff

Laura Ratliff

Laura Ratliff is a New York-based writer and editor. She lives in downtown Brooklyn with her husband and their beloved dogs. Originally from Texas, she now considers New York City her home. She typically spends more than 200,000 miles on a plane each year and stays in plenty of hotels.

Read more
Harriet Baskas

Harriet Baskas

Expert on American Airlines and SEA

Harriet Baskas

Harriet Baskas

Harriet is an award-winning journalist who is happiest in an airport or an unusual museum. Her stories about airports, air travel, and the business of travel have appeared on NBC News, CNBC, USA TODAY, The Points Guy and other outlets. She is the creator of the StuckatTheAirport.com blog and the author of nine books. When not out on the road or exploring the latest airport amenities, she’s home in Seattle getting ready for the next adventure.

Read more

Good to know

Low seasonJanuary
Cheapest flight$527
Best time to beat the crowds with an average 9% drop in price.
Most popular time to fly with an average 14% increase in price.
Flight from London Heathrow Airport to Seattle

When to book flights from Heathrow to Seattle

Are your dates flexible? Find out the best times to travel from Heathrow to Seattle based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated round-trip price
KAYAK looks at all historical flight data for each date to provide a predicted price for one-way trips or round-trips with a duration up to 40 days. While we try to provide actual minimum prices for each date, some prices are predictions and actual prices may differ.

FAQs for booking London Heathrow Airport to Seattle flights

  • What is the cheapest flight from London Heathrow Airport to Seattle?

    In the last 3 days, the lowest price for a flight from London Heathrow Airport to Seattle was $527 for a one-way ticket and $600 for a round-trip.

  • Do I need a passport to fly between London Heathrow Airport and Seattle?

    Yes

  • Which airports will I be using when flying from London Heathrow Airport to Seattle?

    When flying out of London Heathrow Airport you will be using London Heathrow. You will be landing at Seattle, also known as Seattle/Tacoma Intl.

  • Which airlines offer Wi-Fi service onboard planes from London Heathrow Airport to Seattle?

    Air France, KLM, Delta, and Virgin Atlantic offer inflight Wi-Fi service on the London Heathrow Airport to Seattle flight route.

  • Which aircraft models fly most regularly from London Heathrow Airport to Seattle?

    The Boeing 787-9 Dreamliner is the aircraft model that flies most regularly on the London Heathrow Airport to Seattle flight route.

  • Which airline alliances offer flights from London Heathrow Airport to Seattle?

    SkyTeam, and oneworld are the airline alliances operating flights between London Heathrow Airport and Seattle, with SkyTeam being the most commonly used for this route.

  • On which days can I fly direct from London Heathrow Airport to Seattle?

    There are nonstop flights from London Heathrow Airport to Seattle on a daily basis.

  • Which is the best airline for flights from London to Seattle, Delta or Virgin Atlantic?

    The two airlines most popular with KAYAK users for flights from London to Seattle are Delta and Virgin Atlantic. With an average price for the route of $828 and an overall rating of 7.9, Delta is the most popular choice. Virgin Atlantic is also a great choice for the route, with an average price of $772 and an overall rating of 7.5.

  • How does KAYAK find such low prices on flights from London Heathrow Airport to Seattle?

    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 London Heathrow Airport to Seattle.

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

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Seattle from London Heathrow Airport 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 London Heathrow Airport to Seattle?

    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 to Seattle with an airline and back to London Heathrow Airport with another airline. Booking your flights between London Heathrow Airport and SEA can sometimes prove cheaper using this method.

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

    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 to Seattle from London Heathrow Airport up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

KAYAK’s top tips for finding a cheap flight from London Heathrow Airport to Seattle

  • Looking for a cheap flight? 25% of our users found flights on this route for $662 or less one-way and $763 or less round-trip.

Prefer to fly direct from London Heathrow Airport to Seattle?

 
Direct data is based off flight results for the next 60 days. Find direct flights from all airlines flying direct from London Heathrow to Seattle/Tacoma Intl.
Find which airlines fly direct from London Heathrow Airport to Seattle/Tacoma Intl Airport, which days they fly and book direct flights.

Direct departures

London Heathrow to Seattle/Tacoma Intl

Monday

British Airways, Delta, Virgin Atlantic

British Airways, Delta, +1 more

Tuesday

British Airways, Delta, Virgin Atlantic

British Airways, Delta, +1 more

Wednesday

British Airways, Delta

British Airways, Delta

Thursday

British Airways, Delta, Virgin Atlantic

British Airways, Delta, +1 more

Friday

British Airways, Delta

British Airways, Delta

Saturday

British Airways, Delta, Virgin Atlantic

British Airways, Delta, +1 more

Sunday

British Airways, Delta

British Airways, Delta

See more direct flights

Direct returns

Seattle/Tacoma Intl to London Heathrow

Monday

British Airways, Delta, Virgin Atlantic

British Airways, Delta, +1 more

Tuesday

British Airways, Delta, Virgin Atlantic

British Airways, Delta, +1 more

Wednesday

British Airways, Delta

British Airways, Delta

Thursday

British Airways, Delta, Virgin Atlantic

British Airways, Delta, +1 more

Friday

British Airways, Delta

British Airways, Delta

Saturday

British Airways, Delta, Virgin Atlantic

British Airways, Delta, +1 more

Sunday

British Airways, Delta

British Airways, Delta

See more direct flights

Reviews of the top 4 airlines serving from Heathrow to Seattle

 
See real verified KAYAK customer reviews for airlines flying from London to Seattle. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with from Heathrow to Seattle? 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.
7.9
DeltaOverall score based on 8010 reviews
8.1Boarding
7.3Food
7.9Comfort
7.9Entertainment
8.5Crew
Airline reviews

Original flight was cancelled and when i was rebooked by the airline, they couldn't seat me in the same type of seat as I had originally booked (went from window/aisle to middle/middle and one was a bulkhead seat, and other wasn't in the same class)

6.0 GoodJeff, Dec 2025
JFK - MIA
Read more Delta reviews

Original flight was cancelled and when i was rebooked by the airline, they couldn't seat me in the same type of seat as I had originally booked (went from window/aisle to middle/middle and one was a bulkhead seat, and other wasn't in the same class)

Lady Pilot was perfect in every way wheels up to wheels down communication, professionalism, excellent on time departure and on time arrival, excellent communication! Fantastic job with Superb attitude!!

The food is terrible. The staff is wonderful. Comfort is good.

For some reason, I couldn't choose my seat. The airline gave me a seat when I got there. Not happy about that. Otherwise, everything else was great!

Left on time, a bit delayed due to headwinds most of the trip.

I fly Delta all the time, have Platinum Medallion status. But this route seems to have major problems with delays and seems to never leave on time! Have only taken it twice in the last two weeks, and each time it had delays of more than 1 hour... very disappointed!!!!

Good seats in Main cabin, excellent service and excellent landing

My flight was cancelled with no explanation after I had already cleared security. I was given 4 options to rebook, only one being non-stop like I had paid for. I grabbed it. It was 4 plus hours later and then took off even later. Biggest complaint is that I booked early and had an aisle seat. They gave me a "window" seat in front of the exit row, so the seat did not decline. I weigh all of 103 #s and it was tight for me! For what I paid, I feel I was kind of ripped off. I think they should have given me the empty comfort seat for the inconvenience. There was no apology nor any explanation as to why the flight was cancelled. My guess is it benefitted Delta in some way.

DELTA does a terrific job making sure you are well taken care of during the flight, gives you assurance before the flight through numerous email notifications about your upcoming flight & lastly good follow up after the flight making sure your needs were mat. It has been, is & will continue to be my carrier of choice in all my future travels. Good Job DELTA

The customer service before board was very rude and when I expressed my concerns about making the connecting flight she laughed and told me I bought the wrong ticket. I explained once it showed the flight was delayed it no longer let me change seats or anything. I was trying to upgrade to make sure I would get to the next gate on time.

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.

Flight was delayed because of a bird strike. They had another plane available within 45 minutes.

The business class seats are dated and uncomfortable. The space is bare minimum and there is absolutely no privacy. For $4K, this is not what I expect.

Flight, food and crew were all good, friendly and very satisfactory.

Lost luggage after 2 days no word leaving on cruise no stuff or clothes

Staff's did their best to make everyone comfortable and I appreciate them for it

Pathetic check in experience once again. Not enough staff scheduled at bag drop or for special assistance at LHR. Really need to rethink the whole self check in procedure. The crew was good. A very decent selection of special meals in this leg as compared to the JFK-LHR leg.

Very clean and comfortable cabin. Amazing Mediterranean salad for lunch before landing. Great range of films to watch. Really quiet and easy to sleep on the flight also. The initial food was a bit weird: odd fried chicken pieces in some weird white gloop, but that would be my lack of cultural knowledge on the grub. Salad more than made up for it at the other end. Staff were super attentive and helpful. Great and easy flight

I flew Business Class. Rory, one of the Cabin stewards, was attentive, explained the menu, provided appropriate drinks. was

The flight crew were friendly and attentive. Food was good and they passed out ice cream and drinks awhile after Lunch was done. The ice cream was a nice treat! I found several movies to watch during the flight. There was many movies and tv shows to choose from. We flew Premium economy and there was enough leg room to be comfortable. The seats were also comfortable. I would fly AA again if the airfare isn’t expensive.

Gate check bags that had to be gate checked because of first flight being a small flight are missing. British airways lost the luggage and haven’t met up with them yet!

I was in a bulkhead seat and my tray table wasn't level. Eating was difficult.

Audi visual not working for a whole group of seats in first class. How does a plane leave the main hub in such poor condition? How much that we can’t see so immediately is also compromised?

main meals are horrible but then you dont fly for the food

It was good. Couldn’t Check in online and select seats

It was great. Enough space and room for legs . Great service to.

⭐ British Airways Review — A Journey of Highs, Lows, and Lessons ⭐ I recently flew Business Class round-trip from Boston to Mumbai with British Airways, and my experience was a tale of two extremes — from disappointment to exceptional service, and then back to inconsistency. Boston → London: A Surprisingly Poor Start My journey began on a disappointing note. On a 6-hour Business Class flight, I was surprised to discover that there wasn’t a single proper vegetarian meal option available. I was offered a few bakery items only after repeatedly requesting something to eat. The flight attendant shrugged, offered no solution, and eventually — quite literally — threw some bread at me after much delay. This was not only disheartening, it was extremely surprising given my wonderful Business Class experience with BA last year. I stepped off that flight genuinely hungry and had to make a mad dash to the lounge just to get a proper meal. London → Mumbai: A Complete Turnaround The next sector restored my faith in British Airways. The entire crew was warm, welcoming, attentive, and genuinely caring. A special shoutout to Phiroze and the entire team serving the Business Class cabin — their professionalism, hospitality, and thoughtful service were extraordinary. They truly embodied what makes British Airways a global leader, and I am deeply grateful for the experience they provided. This is the BA I know and love. Mumbai → London: A Strange Meal Schedule This sector was generally fine, but the meal timing was puzzling. Lunch at 10:30 AM — for a Business cabin — felt unusual, and most passengers, including myself, barely touched it. The rest of the service was smooth, but the scheduling definitely needs a rethink. London → Boston: Mixed Experience Again The flight itself was decent, but the Business Lounge at Heathrow for this leg was a letdown. Arrived during lunch hours: no hot vegetarian options available Lounge area: dirty dishes everywhere Even after politely alerting the staff, the dishes were ignored and left uncleared For a premium cabin passenger — and at one of the world’s busiest international hubs — this was disappointing. Overall Impression My journey with British Airways felt inconsistent — two great sectors sandwiched between two that fell short of the BA standard. When BA is good, it is world-class. When it misses, the gap is noticeable. I genuinely hope the airline takes this feedback as constructive insight. I continue to believe in British Airways, and I commend the outstanding crew on the London → Mumbai sector — they were the highlight of my entire trip. With a little more focus on vegetarian meal availability, lounge service, and consistency across crews, BA can ensure every Business Class passenger experiences the premium journey they promise.

We were in business class and I had seat # 1. This was a night flight and after dinner was served, lights were dimmed and I went to sleep. The crew were loud and noisy so I didn’t get much sleep. I expect the crew to enjoy themselves but would Appreciate some decency in staying quiet while the passengers sleep

Have travelled business class with other airlines who profess to be the best in the world. They can however not beat the service and comfort that BA provide.

Great on board entertainment Tasty food Cattle class obviously crammed but not as bad as shorter hall flights

Logan gate staff was unhelpful. Arrived early, come to find out the airbus scheduled was reassigned and I did not have a seat. The desk agent spoke to his supervisor who instructed him to give me a boarding pass to get up to gate area, he was polite. At the gate the fellow was sitting to the side with two other BA staff . I asked him if he could help me, his answer was” we are on a break, we are closed” then turned his back. I am almost 70, drove 4 1/2 hours to Boston and had been looking forward to this trip for 5 months. I have worked in service many times in my life and this is not how it is done. I eventually (1/2 hr) before boarding was able to get a seat. The rest of the flight experience was unremarkable.

Everything you need to know for your flight from Heathrow to Seattle

Information on your arrival and departure airports