Find cheap flights from Washington Dulles Airport to London

IAD - LON

Find cheap flights from Washington Dulles Airport to London

Round-trip
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Washington (IAD)
London All airports
Fri 10/23
Fri 10/30
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Good to know

Low season

February Best time to beat the crowds with an average 21% drop in price.

High season

June Most popular time to fly with an average 29% increase in price.

Average price of a round-trip

$688 (avg. price over the last 2 weeks)

Good deal for a round-trip

$646 or less

When to book flights from Washington Dulles Intl to London

Estimated round-trip price
Average price per month
Flight prices as travel date approaches
-1 day
-2 days

Top tips for finding a cheap flight

  • Looking for a cheap flight? 25% of our users found flights on this route for $566 or less.
  • The cheapest flight from Washington Dulles Airport to London was found 44 days before departure, on average.
  • Book at least 3 weeks before departure in order to get a below-average price.
  • High season is considered to be May, June and July. The cheapest month to fly is February.
  • Morning departure is around 49% cheaper than an evening flight, on average*.
*Average of the lowest prices shown in KAYAK’s search results for departures within the next 30 days

FAQs for booking Washington Dulles Airport to London flights

Which airlines have a flexible cancellation policy for flights from Washington Dulles Intl to London due to COVID-19?

Which airlines apply social distancing measures on flights from Washington Dulles Intl to London due to COVID-19?

Are there London travel restrictions currently due to Coronavirus?

How long does a flight from Washington Dulles Airport to London take?

How many flights are there between Washington Dulles Airport and London?

Which airlines provide the cheapest flights from Washington Dulles Airport to London?

Do I need a passport to fly between Washington Dulles Airport and London?

Which airlines fly most frequently between Washington Dulles Airport and London?

What’s the cheapest day of the week to fly Washington Dulles Airport to London?

How does KAYAK find such low prices on flights from Washington Dulles Airport to London?

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

What is the Hacker Fare option on flights from Washington Dulles Airport to London?

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

Top airline flying Washington Dulles Intl to London

Scores according to KAYAK customer reviews

7.2
TAP AIR PORTUGAL
Overall score based on 5,344 reviews
7.2
Boarding
7.2
Comfort
7.9
Crew
6.6
Entertainment
6.9
Food
Airline reviews

Pros: "Smooth flight"
Cons: "More food, more water"

Pros: "The crew were very nice overall but one flight attendant in particular was incredible. I didn’t get a name but he was friendly, welcoming, and kind."
Cons: "I sat in an emergency row with an empty seat to my left and really did not like how the passenger in the row behind me kept getting up and walking into my row to get his stuff from the bins."

Pros: "Sleeping and being left alone"
Cons: "Food, Service by cabin crew because they never smiled"

Pros: "The flat bed"
Cons: "The Captain made loud announcements waking you up"

Pros: "Amazing punctuality, both on the way out to Lisbon and on the return to London."
Cons: "Cannot really think of anything that needed attention on these flights."

Pros: "I didn’t like a thing. The crew from the gate all the way to the end was rude and nasty. The crew scanning people to get on the plane were so rude at the beginning it was the worst and I fly for my work and I’ll never fly TAP air Portugal again."
Cons: "Train the staff to be nice and pleasant"

Pros: "Super friendly"
Cons: "Maybe a hot meal?"

Cons: "Too cold on plane"

Cons: "Probably the most uncomfortable flight I have taken in a very very long time. The ride was smooth but the seat was so terribly uncomfortable. I was in pain on arrival."

Cons: "We had to pay $120 for a checked bag because it “weighed too much”. The lady at the check in counter said they were weighing everyone’s at the gate so there was no way to get around it This however was a lie and they were not checking weight and people got on without having to pay the outrageous fee"

Cons: "So many delays, no real info provided. When we had to stay overnight they didn’t mention it would take 4 hours to get our bags which actually never came. Airline industry sucks and deltas one of the worst."

Pros: "The only salvation was the entertainment choices. ."
Cons: "The planes need to upgrade the seats. When we were served food if the person push their seat back your food tray would flip like two did on our flight. Staff was jaded and sarcastic. I'm glad I had a discounted flight. I'd be angry if I paid full price. Poor staff, seat architecture, and poor food."

Cons: "Not cancelling it"

Pros: "Cod fish meal was nice! Lots of movie options, and the staff were nice."
Cons: "Foot rests would have been great to have. The boarding process was exhausting. A long line for another passport check (after the immigration check point) and the long bus ride to the aircraft."

Pros: "flight was more than 4 hours late!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!"
Cons: "flight was more than 4 hours late!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!"

Cons: "Passport control in Lisbon was awful and many people missed their flight in spite of them being made aware of the issue."

Pros: "clean and fast"
Cons: "use airport finger in Lisbon airport"

Cons: "We didn't select our meal option for vegetarian because the last time we did we ended up with a horrible, horrible, hockey puck like dry food option. We assumed there would be a cheese pasta option, as there usually is, well we were completely wrong. Both options were meat, even the salad had meat in it. So we got a roll with butter, a tiny fruit, and a disgusting wet dessert. Even the breakfast was meat and cheese. I got online to select our meal option for our return trip, and the options are out of control. We have a lacto-ovo-vegetarian option, whatever that is"

Pros: "I did like that the flight wasnt full"
Cons: "Website was not intuitive with regard to baggage fees. Paid $100++ for ONE bag ans then they failed to transfer my bags to the connecting flight. Still waiting on the status of my belongings."

Pros: "Nothing"
Cons: "Everything"

Pros: "Surprised and delighted to be served a tasty sandwich and fruit drink plus glass of wine on a 3 pm 2 + hr flight from Lisbon to London"
Cons: "Seats uncomfortable"

Pros: "Not much"
Cons: "When TAP couldn’t get me to Lisbon in time to make my connection they added a flight to Madrid where I waited until 16:00 to fly to Seville. I talked to several TAP representatives and none were helpful or apologetic and they offered me nothing for the problems they caused. I missed my only day in Seville due to this. This trip turned out to be a disaster."

Pros: "The entertainment was good and the food was better than I expected."
Cons: "Bags restrictions without us knowing. Delayed flight but we still manage to get to our destination on time. The same did not happen before where I had to wait until 2am for my tap flight that was supposed to leave at 11:30pm. I have been flighting TAP for many years now and it used to be one of my favorite airlines. No longer is the case. Over the years there has been a decline on service."

Pros: "Clean modern aircraft"
Cons: "Left 35 minutes late; had to take a bus to the plane in Lisbon (no gate)"

Pros: "Prompt and courteous"
Cons: "Not enough leg room, just not enough space al the way around to be comfortable."

Pros: "Excelent fly! No deley! Excelent crew! Good food!"

Cons: "Flight was over an hour late, and they would not let us take our carry-on luggage on the flight even though there was plenty of room in the overhead compartments, which caused us to miss our return flight home overseas. No customer service desk at the airport. Ended up costing hundreds of dollars more to book another flight home."

Cons: "The fact that the airline only gave us a 18Euro voucher good enough for one meal. A thievery."

Pros: "The crew did a great job."
Cons: "The boarding process was nutz. We had to take a bus away from the terminal to board the plane. The flight was delayed. I was not very happy to have to spend $92 to check 2 bags."

Pros: "Flight on time and safe Crew very pleasant"
Cons: "Cramped seating Boarding dreadfully slow"

Cons: "My flight to Miami was delayed due to weather. I missed my connection to LHR, therefore missed my TAP flight to Portugal. I called TAP (before the flight) and they would not change the flight because I went through a travel site. My $240 ticket was lost, and I had to pay over $900 for a new one. I doubt I will use an internet site again because I will unlikely get a refund and it was impossible to change the ticket. Feel awful!"

Cons: "We booked flight several months ago and it included seating assignment, so we choose our seats. Then when we check-in they had changed them to the last row of the plane. We had received a couple of emails asking for us for option to pay for advance seating. Assume they had changed their policy and now were charging. We had a close connection at LHR and being last off, we almost missed connection. Horrible"

Cons: "The terminals they use have no express lanes for biz travel. Very stressful particularly if short layover time."

Cons: "The delay on the take off"

Cons: "We had to postpone our first leg from London to Lisbon by a day and then they cancelled our return flight without telling us!!! So, we were trapped in Lisbon with no flight to return home. We called them and they said, "we cancelled your tickets and only have business class seats available for you and your toddler." We said no thank you. If we were going to spend 1k on a return flight, we were going to take British Airways. TAP, never again."

Cons: "The service was below average, nobody seems to be eager to assist. The food that was offered on the flight was below expectations. The company should work on improving customer care"

Pros: "Crew friendliness and attention"
Cons: "They ran out of diet coke and coke zero literally right after takeoff which is a joke!"

Cons: "The sizing device is much smaller than it needs to be for carry on roller bags. My bag was forced to be checked by the ground crew on this Tap flight. My bag is a normal sized carry on bag that has always fit on all flights. There was plenty of space on the aircraft for it. The ground crew also let others on with larger bags so they dont even apply their policy in a consistent manner. I will do my best to avoid TAP from now on."

Cons: "The lady changed my 11H seat for another seat (29B) when I claim that this is not fear , a man said to me that if I insist in this matter he will not let me in Or flight , for me this was an abuse"

Pros: "Excellent service on board and at the ground... Very convenient United conection in the US :)"

Cons: "I found it very frustrating that we were told at the ticket counter the boarding would begin at 11:15am for a 12:45pm flight time. I arrived at the airport over two hrs in advance and then had to run a significant distance through the airport and sweat and be unnecessarily anxious waiting on the customs line only to arrive at the gate at 11:20am, to have my bags checked for a second time and then be unable to get any food or coffee before a flight that did not begin boarding for another 40 minutes. I did and still do not see the need for that additional luggage/security check and then being held at the gate for almost an extra hour for seemingly no reason at all."

Pros: "Everything was perfect! The staff was friendly and the food was nice. I found that there was more leg room than on other airlines."
Cons: "I used TAP to depart beautiful Portugal."

Pros: "Exceptional service and professionalism of crew. Food was delicious...Aircraft was clean. Left on time...landed half hour early. It was a perfect flight."
Cons: "My husbands snoring. LOL."

Pros: "Not much. Lunch"
Cons: "We paid to check the bag In and when we arrived the girl could not see this. We showed her clearly the paper then she charged ya and realised she had made a mistake but couldn't refund us. Terrible experience. Don't use the."

Pros: "Flights were on-time, planes were clean/newer, snacks were good."

Pros: "The flight was fine, no issues. Plane was fine, no WIFI or entertainment. Served a small meal. For the price, excellent trip."
Cons: "All was good."

Pros: "The service was excellent. The help on board was extremely professional and polite. There was plenty of leg room and the bathrooms were fairly large too."
Cons: "Na"

Pros: "Ask persons for veg or non veg snacks before u served please."

Pros: "Lots of flight options."
Cons: "Both outbound and inbound flights late, no real explanation for inbound. Boarding on inbound was chaotic."

Read more about TAP AIR PORTUGAL
COVID-19 information

Safety measures for airlines flying from Washington to London

Airlines flying from Washington to London have enacted additional safety measures and adjusted policies to better accommodate travelers. Policies vary by airline.

Heightened sanitation

Daily cleaning, installation of cabin HEPA filters

Mandatory masks

Masks required on board, masks provided

Social distancing seating

Middle seats unavailable to book

Pre-flight testing

Testing for antibodies, testing for symptoms

Book cheap flights from Washington Dulles Airport to London

Recent round-trip flight deals

11/12
Thu
2 stops
Multiple Airlines
20h 05m
IAD - LGW
11/18
Wed
2 stops
Multiple Airlines
19h 35m
LGW - IAD
10/27
Tue
1 stop
TAP AIR PORTUGAL
11h 45m
IAD - LHR
11/2
Mon
1 stop
TAP AIR PORTUGAL
14h 40m
LHR - IAD
11/12
Thu
2 stops
Multiple Airlines
20h 45m
IAD - STN
11/18
Wed
2 stops
Multiple Airlines
19h 55m
STN - IAD
3/2
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Aer Lingus
12h 05m
IAD - LCY
3/12
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1 stop
Aer Lingus
11h 30m
LCY - IAD
12/28
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1 stop
Delta
9h 25m
IAD - LCY
1/11
Mon
1 stop
Delta
11h 25m
LCY - IAD
11/3
Tue
2 stops
Multiple Airlines
20h 10m
IAD - LGW
11/9
Mon
2 stops
Multiple Airlines
19h 10m
LGW - IAD
10/27
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1 stop
TAP AIR PORTUGAL
16h 35m
IAD - LHR
11/1
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1 stop
TAP AIR PORTUGAL
32h 25m
LHR - IAD
2/2
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1 stop
SWISS
18h 00m
IAD - LCY
2/17
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SWISS
27h 00m
LCY - IAD
11/12
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Multiple Airlines
20h 45m
IAD - STN
11/18
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Multiple Airlines
19h 55m
STN - IAD
12/21
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1 stop
KLM
9h 25m
IAD - LCY
12/28
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1 stop
KLM
12h 05m
LCY - IAD
12/21
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Virgin Atlantic
9h 25m
IAD - LCY
1/8
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Virgin Atlantic
11h 25m
LCY - IAD
1/11
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Lufthansa
17h 40m
IAD - LCY
1/18
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Lufthansa
13h 10m
LCY - IAD
10/31
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TAP AIR PORTUGAL
11h 45m
IAD - LHR
11/16
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TAP AIR PORTUGAL
22h 20m
LHR - IAD
11/7
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2 stops
Multiple Airlines
20h 10m
IAD - LGW
11/18
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2 stops
Multiple Airlines
19h 35m
LGW - IAD
10/27
Tue
1 stop
TAP AIR PORTUGAL
16h 35m
IAD - LHR
5/20
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TAP AIR PORTUGAL
13h 50m
LHR - IAD
11/7
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2 stops
Multiple Airlines
17h 55m
IAD - LGW
11/9
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2 stops
Multiple Airlines
19h 10m
LGW - IAD
11/19
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TAP AIR PORTUGAL
16h 35m
IAD - LHR
11/26
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1 stop
TAP AIR PORTUGAL
33h 50m
LHR - IAD
10/27
Tue
2 stops
Multiple Airlines
20h 45m
IAD - STN
11/6
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2 stops
Multiple Airlines
19h 55m
STN - IAD
11/7
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1 stop
TAP AIR PORTUGAL
11h 45m
IAD - LHR
11/9
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1 stop
TAP AIR PORTUGAL
14h 40m
LHR - IAD
11/3
Tue
2 stops
Multiple Airlines
20h 10m
IAD - LGW
11/6
Fri
2 stops
Multiple Airlines
19h 20m
LGW - IAD
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Recent one-way flight deals

10/27
Tue
1 stop
TAP AIR PORTUGAL
16h 35m
IAD - LHR
11/12
Thu
2 stops
Multiple Airlines
20h 45m
IAD - STN
11/7
Sat
1 stop
TAP AIR PORTUGAL
11h 45m
IAD - LHR
10/27
Tue
1 stop
TAP AIR PORTUGAL
11h 45m
IAD - LHR
10/31
Sat
1 stop
TAP AIR PORTUGAL
11h 45m
IAD - LHR
1/3
Sun
nonstop
Iberia
7h 05m
IAD - LHR
11/5
Thu
2 stops
Multiple Airlines
20h 45m
IAD - STN
11/19
Thu
1 stop
TAP AIR PORTUGAL
11h 45m
IAD - LHR
11/7
Sat
2 stops
Multiple Airlines
17h 55m
IAD - LGW
1/4
Mon
1 stop
Virgin Atlantic
9h 25m
IAD - LCY
11/26
Thu
1 stop
TAP AIR PORTUGAL
11h 45m
IAD - LHR
11/21
Sat
3 stops
Multiple Airlines
46h 40m
IAD - STN
1/6
Wed
1 stop
KLM
10h 45m
IAD - LCY
1/8
Fri
1 stop
Icelandair
10h 15m
IAD - LGW
11/26
Thu
1 stop
Turkish Airlines
29h 00m
IAD - LGW
1/12
Tue
1 stop
Lufthansa
18h 10m
IAD - LCY
11/21
Sat
3 stops
Multiple Airlines
46h 15m
IAD - STN
10/31
Sat
1 stop
TAP AIR PORTUGAL
11h 45m
IAD - LHR
11/5
Thu
2 stops
Multiple Airlines
17h 50m
IAD - LGW
10/31
Sat
1 stop
TAP AIR PORTUGAL
11h 45m
IAD - LHR
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