$237 Find Cheap Flights from Washington Dulles Airport to 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 Dulles Intl to the United Kingdom departing on 9/3. 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 Dulles Intl to the United Kingdom

Cheapest round-trip prices found by our users on KAYAK in the last 72 hours
London
London2 stops$603
Edinburgh
Edinburgh2 stops$705
Manchester
Manchester1 stop$573
Birmingham
Birmingham1 stop$653
Belfast
Belfast2 stops$686
Inverness
Inverness1 stop$647
Bristol
Bristol2 stops$707
Aberdeen
Aberdeen1 stop$685
Leeds
Leeds1 stop$734
Liverpool
Liverpool2 stops$694
Cardiff
Cardiff2 stops$825
Newquay
Newquay1 stop$915
Exeter
Exeter2 stops$865
Kirkwall
Kirkwall2 stops$844
London
London2 stops$603
Edinburgh
Edinburgh2 stops$705
Manchester
Manchester1 stop$573
Birmingham
Birmingham1 stop$653
Belfast
Belfast2 stops$686
Inverness
Inverness1 stop$647
Bristol
Bristol2 stops$707
Aberdeen
Aberdeen1 stop$685
Leeds
Leeds1 stop$734
Liverpool
Liverpool2 stops$694
Cardiff
Cardiff2 stops$825
Newquay
Newquay1 stop$915
Exeter
Exeter2 stops$865
Kirkwall
Kirkwall2 stops$844

Book Cheap Dulles Intl 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 Dulles Intl 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 Dulles Intl to the United Kingdom

Sat, Apr 18 - Mon, May 4
TAP AIR PORTUGAL Logo
10:35 pm - 10:05 am
IAD
-
MAN
30h 30m
1 stop
TAP AIR PORTUGAL Logo
5:55 pm - 3:10 pm
MAN
-
IAD
26h 15m
1 stop
$573TAP AIR PORTUGAL
Mon, Apr 27 - Tue, May 12
Icelandair Logo
8:30 pm - 1:25 pm
IAD
-
GLA
11h 55m
1 stop
Icelandair Logo
2:20 pm - 7:20 pm
GLA
-
IAD
10h 00m
1 stop
$585Icelandair
Mon, Apr 27 - Fri, May 8
Icelandair Logo
8:30 pm - 1:25 pm
IAD
-
GLA
11h 55m
1 stop
Icelandair Logo
2:30 pm - 7:20 pm
GLA
-
IAD
9h 50m
1 stop
$598Icelandair
Fri, Aug 21 - Mon, Sep 7
Icelandair Logo
11:20 pm - 1:25 pm
IAD
-
GLA
9h 05m
1 stop
Icelandair Logo
2:20 pm - 7:20 pm
GLA
-
IAD
10h 00m
1 stop
$601Icelandair
Sun, Apr 26 - Sun, May 3
Scandinavian Airlines Logo
8:20 pm - 4:00 pm
IAD
-
LHR
14h 40m
1 stop
Scandinavian Airlines Logo
6:40 am - 5:00 pm
LHR
-
IAD
39h 20m
2 stops
$604Scandinavian Airlines
Mon, Apr 13 - Fri, Apr 24
Scandinavian Airlines Logo
8:20 pm - 4:25 pm
IAD
-
LHR
15h 05m
2 stops
Scandinavian Airlines Logo
10:20 am - 5:00 pm
LHR
-
IAD
11h 40m
1 stop
$606Scandinavian Airlines
Fri, Apr 3 - Thu, Apr 9
Delta Logo
5:40 pm - 8:45 am
IAD
-
SOU
10h 05m
1 stop
Delta Logo
9:05 am - 3:35 pm
SOU
-
IAD
11h 30m
1 stop
$908Delta
Mon, Aug 24 - Mon, Sep 7
KLM Logo
6:10 pm - 8:45 am
IAD
-
SOU
9h 35m
1 stop
KLM Logo
5:20 pm - 3:35 pm
SOU
-
IAD
27h 15m
1 stop
$909KLM
Thu, Apr 2 - Wed, Apr 8
Delta Logo
5:40 pm - 8:35 am
IAD
-
SOU
9h 55m
1 stop
Delta Logo
9:05 am - 3:35 pm
SOU
-
IAD
11h 30m
1 stop
$910Delta
Wed, Apr 29 - Wed, May 6
Aer Lingus Logo
5:15 pm - 8:40 am
IAD
-
SOU
10h 25m
1 stop
Aer Lingus Logo
9:20 am - 7:25 pm
SOU
-
IAD
15h 05m
1 stop
$913Aer Lingus
Booking Insights

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

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

What is the cheapest Washington, D.C. Dulles Intl Airport 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 Washington, D.C. Dulles Intl Airport found in the last 72 hours was to London, at $613 round-trip. The most popular route is from Washington, D.C. Dulles Intl Airport (IAD) to London Heathrow Airport (LHR), and the cheapest round-trip airline ticket found on this route in the last 72 hours was $613.

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

The average price for all round-trip flights from Washington, D.C. Dulles Intl Airport 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 evening, when round-trip flights cost $799 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 $807.

Can I save money by flying with a layover from Washington, D.C. Dulles Intl Airport 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 $921, prices are generally cheapest when you fly direct.

What is the cheapest month to fly from Washington, D.C. Dulles Intl Airport 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 Washington, D.C. Dulles Intl Airport 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 Washington, D.C. Dulles Intl Airport to the United Kingdom is September, when tickets cost $629 (return) on average. On the other hand, the most expensive months are June and December, when the average cost of round-trip tickets is $989 and $909 respectively.

What’s the cheapest day of the week to fly from Washington Dulles Airport to United Kingdom?

The average price of all round-trip flights from Washington, D.C. Dulles Intl Airport to the United Kingdom clicked on KAYAK for each day over the last 12 months.

If you are looking for a flight deal from Washington Dulles Airport to United Kingdom, look for departures on Wednesdays and avoid leaving on a Saturday, as it's usually the priciest day. When flying back from United Kingdom, Thursday is the cheapest day to fly and Tuesday is the most expensive.

How far in advance should I book a flight from Washington, D.C. Dulles Intl Airport 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 Washington, D.C. Dulles Intl Airport 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 Washington, D.C. Dulles Intl Airport to the United Kingdom, you should book around 3 weeks before departure, which saves you about 23% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 5 weeks before departure.

Good to know

Low seasonFebruary
Cheapest flight$237
Best time to beat the crowds with an average 17% drop in price.
Most popular time to fly with an average 12% increase in price.
Flight from Washington Dulles Airport to Manchester

Flights from Dulles Intl to the United Kingdom: the best tips from KAYAK users

Insights shared by verified travelers who flew the route from Dulles Intl to the United Kingdom 
DeeFlew with United Airlines
IAD
-
LHR
Feb 2025
For me the best route to LHR is the late night departure on UAL. The flight is often roughly 6.5 hours so I skip dinner, use an eye mask and earplugs and try to sleep.
EllenFlew with British Airways
IAD
-
LHR
Oct 2024
Do not check your bag if at all possible, especially if you have a connecting flight. Your bag will not make it.
CraigFlew with United Airlines
IAD
-
LHR
Jun 2024
Get to beginning of boarding group early. Bring as little on board as possible due to small overhead bin space.

FAQs - booking United Kingdom flights

  • How does KAYAK find such low prices on flights from Washington Dulles Airport to 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 Washington Dulles Airport to United Kingdom.

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

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight from Washington Dulles Airport to 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 Washington Dulles Airport to 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 Washington Dulles Airport to 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 Washington Dulles Airport to 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 Washington Dulles Airport to 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 Washington Dulles Airport to the following destinations at these prices or less: London $418 one-way - $723 round-trip

Reviews of the top 5 airlines serving from Dulles Intl to the United Kingdom

 
Need help choosing which airline to fly with from Dulles Intl 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.
7.4
United AirlinesOverall score based on 9431 reviews
7.3Comfort
7.1Entertainment
7.7Boarding
6.6Food
8.1Crew
Airline reviews

The flight was delayed so we were dead tired, and after that the turbulence was horrible. I was very scared.

4.0 OkayOlga, Mar 2026
IAD - TYS
Read more United Airlines reviews

The flight was delayed so we were dead tired, and after that the turbulence was horrible. I was very scared.

Wifi took a while to kick in and we had a maintenance issue that took over 40 mins at the gate in Washington before pulling back

Very good. Because of the delays with my previous flight, I missed my connection, but I was able to book another flight through the United app easily.

Was happy we finally got upgraded in 1st class. The seat getting old. The cushiness need some improvement.

Ineffective communication with United resulted in lost baggage. Their Baggage Tracing counter at MUC was shut down from 11:00-14:15 on my arrival. Undertrained, underinformed staff had me Running all over MUC to find someone to help me to no avail. Staff was rude, unhelpful, and unable to effectively use the systems they did have operational. They refused to contact United in any way or provide any accommodation or other resources while I waited for my luggage. This has destroyed my downstream itinerary. If they had even the slightest visibility I may have been able to reschedule/plan, but again, their staff provided nothing, and did nothing more than their website, which doesn’t even work on a standard phone browser. Miserable failure at all levels that weren’t associated with the operation of the aircraft.

Sat next to a one year old. She crawled all over the place and made me laugh.

The Crew and the food was the worst I ever had in Business Class. First they told us there were no space for carry on. It was plenty of space over our 2 row seats, we had to ask to let us travel with it which was accepted. They were aware that we had to run for the connection due to the previous flight delay. Have us one hour waiting for more customers and not even offer a glass of water. Then started the service and they started to serve other passengers drinks in business and did not offer any drinks until they serve our pre ordered meal and I ask for something to drink. I had to wait until they finished to serve all passengers until Inget something. The crew was the worts I ever had for Business Class in my life.

Not great experience - we were super late boarding due to issues with aircraft. Then when we finally all got onboard and seated and they started taxiing out to the runway they just stopped then turned around and went back to the airport. Apparently the crew “ran out of time” to legally fly us. They mentioned that they were about 2 minutes away from taking off. I understand the rules and safety but kinda wonder why they would have bothered boarding us in the first place? Had to go all the way back and de plane and then wait in a HUGE line to get a hotel (this is somewhere around 2:30am) finally got to hotel by Uber (no shuttle after 20min so gave up) and they ended up putting us all back on the same aircraft at 10am next morning so got about 2.5 hours sleep. They did give us. $250 credit, but it was a São Paulo Brazil flight out of Dulles. The flight and everything was fine.

Starlink wifi on the Embraer E175 is an excellent experience. I was able to connect and work from IAD all the way to approach into BTV.

7 hours delayed due to operational issues on United’s end. Basically laziness.

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!

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.

Flight delay for mechanical. Inbound arrived on time. No one said why mechanical delay.

Flight boarded, departed and landed on time. Excellent service from flight attendant in FIRST

This was one of the most frustrating travel experiences I've had to date. I had changed my flight day of to this one as it was slated to depart on time. It ended up being so delayed that my original flight took off before this one did. The boarding process began but eventually stopped and everyone had to get off the plane as a problem was identified. The person at the front desk just tried to laugh it off as if this wasn't already a huge inconvenience. From there, we eventually got to board only to sit at the gate for an additional hour because of some additional issue. This was extremely frustrating and caused a lot of stress.

My flight to London from Philadelphia was cancelled due to weather.

It was a little concerning to hear the ground crew arguing with the flight crew over baggage space. Instead of taking them and checking them, they started checking for space in the first class cabin moving items around like the flight crew didn't know what they were doing. I was embarrassed for them.

delayed due to weather. Could not communicate with family since the wifi was broken

I got sick nothing contagious but distressing and the care I received by Kayla? Keighly the flight attendant will be memorable for ever. Thank You

We were told the flight was delayed 5 times, then it was moved to the next day.

Flight delay was communicated before leaving for airport which caused it to be a non-event. Great flight and crew!

The flight attendant, a black woman with curly hair who sat near Row 21, was wonderful and kind.

Nice, quick flight. There were lots of empty seats so they told me I could sit next to the emergency exit where I would have more legroom.

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.

The customer service was unbeatable from the wheelchair assist team to the flight attendants. The pilot also did an excellent job managing the turbulence.

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!

Having been prepared for paying for everything on board other than water, coffee and tea the service was OK. Food and drink is expensive but the food was OK if limited in scope. Plane was clean and obviously well serviced. After complaining about having to walk in wind and rain to a get a bus to the airport the same thing happened at Portland. I’m sure you could get a terminal gate flight, complimentary food and drink for not much more money without traipsing through rain and slush in Reykjavik. Not bad but not great.

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.

The boarding process seem to take longer than necessary, resulting in a 20+ minute delay

Very please with the seating that the Kayak staff booked for us!

Worth every penny to upgrade to BC. Treated and felt more like First Class

Good service, food and comfort in World Traveller Plus. Entertainment was poor - no wifi on the way out and barely working on the way back. Not a great choice of entertainment on the seat back tv.

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.

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

Information on your arrival and departure airports