Find Cheap Flights from London to Washington Dulles Intl (LON - IAD)

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Good to Know

Low Season:
February
Best time to beat the crowds
3%
expected price decrease
High Season:
July
Most popular time to fly
14%
expected price increase
Average Price:
$910
(avg. price over the last 2 weeks)
Good Deal:
$725
or less (round trip)

When to Book Flights from London to Washington Dulles Intl

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 $724 or less.
The cheapest flight from London to Washington Dulles Intl was found 90 days before departure, on average.
Book at least 7 weeks before departure in order to get a below-average price.
High season is considered to be June, July and August. The cheapest month to fly is February.
Morning departure is around 7% 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 London to Washington Dulles Intl Flights

How long does a flight from London to Washington Dulles Intl take?
An average nonstop flight takes 8h 20m, covering a distance of 3680 miles.
How many flights are there between London and Washington Dulles Intl?
There are 422 (nonstop) flights between London and Washington Dulles Intl per week, averaging 60 per day.
Which airlines provide the cheapest flights from London to Washington Dulles Intl?
In the past 3 days, the cheapest round-trip tickets were found on Multiple Airlines ($540), KLM ($552) and United ($562).
Do I need a passport to fly between London and Washington Dulles Intl?
Yes.
Which airlines fly most frequently between London and Washington Dulles Intl?
American Airlines (5 times daily), Air Canada (5 times daily), Austrian Airlines (5 times daily) are the most frequent flyers on this route.
What’s the cheapest day of the week to fly London to Washington Dulles Intl?
For London to Washington Dulles Intl, Thursday is the cheapest day to fly on average and Monday is the most expensive. Flying from Washington Dulles Intl back to London, the best deals are generally found on Wednesday, with Wednesday being the most expensive.

Book cheap flights from London to Washington Dulles Intl (round-trip)

Airports
Origin
London
$552
only
$552
$588
only
$588
$572
only
$572
$540
only
$540
Destination
Washington
$540
only
$540
Thu, May 3
STN
IAD
24h 55m
Sat, May 12
IAD
STN
18h 00m
Trip: 10 days
Overall 0.0 Poor
Based on 0 reviews
Wed, Mar 21
LHR
IAD
12h 10m
Tue, Mar 27
IAD
LHR
12h 05m
Trip: 7 days
7.8GoodShow reviews
Overall 7.8 Good
Based on 1746 reviews
Overall
8.0
Boarding
8.0
Comfort
7.7
Crew
8.5
Entertainment
7.1
Food
7.4
AMS
MAN
Good 7.0

The flight attendants could not do enough for you.

Business class was pretty empty but again I was not allowed to change my seat selection online. Pathetic check-in.

AMS
CPT
Good 6.3

Excellent experience with the cabin crew.

Seats on the 777 were too narrow. This 777 had a 3-4-3 seating arraignment, it would have been better with a 3-3-3, similar to a 787 configuration. With the current layout, even with an aisle seat, I was sitting in the aisle. And I am not a large person! The flight was full, so use the 787 and two daily non-stops. For a twelve hour flight, the food was only Okay, could have been better and with a better selection. Meal timing was poor.

AMS
BLL
Good 6.5

Nice seats, comfortable.

Again, no aisle seat for SkyTeam Gold member. Also, my baggage was lost. First bag arrived a day late, second after I had left Billund and it was six days before the bag with my clothes reached me. I was told I will have 100 euro credit for clothing, but in the winter and for 6 days, this was not even close to the amount I needed for clothing and necessities, to have my time here.

AMS
HUY
Excellent 8.6

The last two times we connected in Amsterdam to Humberside our luggage was delayed. This time it wasn’t. The simple things give the greatest satisfaction

LAX
AMS
Mediocre 2.0

My bagage broke

I paid extra fee for extra bagage which was tv and i paid insurance my tv broke and no one responces for it

Sat, May 12
LHR
IAD
18h 21m
Sun, May 13
IAD
LHR
7h 25m
Trip: 2 days
7.9GoodShow reviews
Overall 7.9 Good
Based on 84 reviews
Overall
7.2
Boarding
7.4
Comfort
7.0
Crew
7.7
Entertainment
6.5
Food
6.4
LHR
IAD
Excellent 10.0

Meal, snack, water and a glass of wine...the entertainment monitor functioned...brought my own ear phones but airline offered them...lotion in the toilet...friendly service...the small comforts make a HUGE difference...not being nickel and dimmed to death...really MATTERS...especially when you are crammed in.

It is difficult to sit for 7+ hours in such tight quarters...but...for the price...I'd do it again. Also I had very considerate seat mates.

LHR
IAD
Good 6.0

I discovered it was was a united airlines flight, causing some confusion. This was false advertising.

You sold me a Lufthansa flight but I got United Airlines one.

LHR
IAD
Excellent 10.0

Comfortable seats, the complimentary wine and beer, the service, the movies!

The flights was delayed, but it worked OK for our schedule this time.

LHR
IAD
Good 6.0

getting off the plane is faster than i'd expect it to be

-kayak, priceline, lufthansa, united!?!?!? the booking was not clear -please provide free wifi w/o jacking up the costs somewhere else -the entertainment system's touch screen is rather clumsy

LHR
IAD
Excellent 10.0

Flight crew was very attentive and made every effort that passengers were comfortable. I will never fly BA again!

Tue, Mar 20
LCY
IAD
23h 00m
Fri, Mar 30
IAD
LCY
10h 45m
Trip: 11 days
8.1ExcellentShow reviews
Overall 8.1 Excellent
Based on 5982 reviews
Overall
8.3
Boarding
8.3
Comfort
7.9
Crew
8.7
Entertainment
7.8
Food
8.0
EWR
ZRH
Excellent 8.6

Everything except the seats.

BOM
ZRH
Excellent 9.3

I was very happy with the overall experience

The crew could have been a little more helpful

ZRH
TLV
Excellent 10.0

The new plane with private screens

BCN
ZRH
Excellent 10.0

100% the best flight experience I've ever had flying. Wish I flew to Europe more so I could fly with Swiss more often. Thanks!

BOS
ZRH
Good 7.3

on time performance; friendly flight attendants

bought a seat reservation in premium economy and was the last group to board. No extra leg room in "premium" economy.

Wed, Jun 6
LHR
IAD
12h 30m
Mon, Jun 11
IAD
LHR
7h 25m
Trip: 6 days
7.3GoodShow reviews
Overall 7.3 Good
Based on 14 reviews
Overall
8.2
Boarding
8.2
Comfort
8.0
Crew
8.5
Entertainment
7.4
Food
7.5
LHR
IAD
Good 6.0

My ability to manage my reservation on United's app as great. I am a Mileage Plus member and thought it would be difficult since I had booked through a third party.

I made special meal requests on Austrian's website under manage my reservation after my booking. Those requests weren't transferred over.

VIE
IAD
Good 6.0

clean airplane. staff friendly and helpful. good movie selection

austrian and lufthansa have the worst seats in the industry. good for seating for about 30 minutes ONLY. so tough that make the trip feel even longer. a charger is needed in economy (at least one every two seats). wifi has not made it to this long haul flight yet.

SOF
VIE
Okay 5.6

Food is appauling!

BRU
VIE
Good 7.2

We were almost three hours late on arrival. Being at VIE airport after midnight with no buses going home is no fun.

LHR
IAD
Excellent 10.0

The crew worked so hard and were always ready to do more for any problem that arose, be it, mothers with babies, the elderly and infirm, the less than gracious occasional passenger, or younger children. The entertaining things on the individual screens also helped make the long periods of sitting more manageable for young and old.

I didn't like how the passengers in general, left the cabin of the plane in such a mess! The crew came through several times for refuse, so I couldn't understand. Leaving pillows and blankets should be the only thing to clear out. Maybe a note on the TV screen could say, "a tidy plane helps flights be on time :-)"

Thu, Mar 1
LGW
IAD
12h 10m
Tue, Mar 6
IAD
LGW
13h 45m
Trip: 6 days
7.4GoodShow reviews
Overall 7.4 Good
Based on 4246 reviews
Overall
7.6
Boarding
7.7
Comfort
7.3
Crew
8.0
Entertainment
7.0
Food
6.9
DUB
LHR
Excellent 8.0

Could not check in on-line from Dublin on either Air canada or Aer Linguis websites. Time to sort out this long-standing problem

DUB
HAM
Okay 5.6

The plane was just fantastic: comfortable, elegant, quiet. Gets the best note!

A free coffee - which was excellent by the way - and a little roll would have been nice.

DUB
JFK
Excellent 10.0

All worked smoothly

Service and friendliness

LHR
DUB
Excellent 8.0

Staff and service

YYZ
DUB
Excellent 8.3

I flew overnight from Toronto, Canada to Dublin and had a relatively pleasant experience. The food and drink trolleys came by quite quickly and frequently, and the food exceeded my expectations. The crew was friendly, for the most part. Boarding certainly could've been smoother... But overall, I'd fly Aer Lingus again for an overseas trip.

Wed, Aug 29
STN
IAD
8h 55m
Sat, Sep 8
IAD
STN
7h 30m
Trip: 11 days
Overall 6.9 Good
Based on 5 reviews
Boarding
6.0
Comfort
6.4
Crew
8.0
Entertainment
6.0
Food
7.3
Sat, Feb 24
STN
IAD
12h 15m
Tue, Feb 27
IAD
STN
20h 05m
Trip: 4 days
8.0ExcellentShow reviews
Overall 8.0 Excellent
Based on 18841 reviews
Overall
8.2
Boarding
8.1
Comfort
7.9
Crew
8.5
Entertainment
7.8
Food
7.7
DEN
MUC
Excellent 10.0

The service was excellent along with the flight being very comfortable.

A little more options in entertainment in the hindi language would be much better for people who do not like to watch English entertainment. Along with that free wifi would be kind of good to have for people who need to work on the flight or check out important emails.

BOS
FRA
Good 7.6

Crew

FRA
LAX
Mediocre 2.0

Had to take a United flight to a different destination. No compensation for something I had no control over. When I am at an airport and have the opportunity to catch an earlier flight you have room on, you charge me. When this kind of thing happens - I pay with my time. Sucks

MUC
FCO
Mediocre 2.0

Nothing good to say

Expect to be delayed if it snows a bit in Munich. Delayed for more than 7 hours total. 3 of those on the plane in Munich. Horrible!

BOS
MUC
Okay 4.0

Worst food ever. Stewardess could not figure out where my seat was . Seemed unfamiliar with the plane.

Thu, Apr 12
LHR
IAD
8h 20m
Sun, Apr 22
IAD
LHR
7h 25m
Trip: 11 days
9.1ExcellentShow reviews
Overall 9.1 Excellent
Based on 22 reviews
Overall
8.1
Boarding
8.2
Comfort
7.7
Crew
8.5
Entertainment
8.0
Food
7.7
BNE
POM
Okay 5.3

Plane was about 30% full so plenty of room to stretch out. Friendly crew.

Flight left 50 minutes late because they'd lost the paperwork and had to get new copies.... not very professional! I can understand a delay due to weather or technical issues but losing paperwork shouldn't happen. The food portion was very small for an international flight.

LAX
BNE
Good 7.0

I never expect airline food to be any good but I’m always hoping it’s edible. This was not the case, as the egg breakfast made me physically ill.

LAX
MEL
Excellent 10.0

Talk about an awesome experience. I loved the friendly staff and the accommodations were superb. I could ask for no better. Even the food was excellent.

I have nothing but praise.

LHR
IAD
Excellent 10.0

The food and service was excellent. Love it!

BNE
LAX
Good 7.6

For oversea traveling, food could and should be better. For our flight from AKL to BNE, we had to pay for our soft drink!!!

Fri, Apr 13
LGW
IAD
11h 00m
Sat, Apr 28
IAD
LGW
10h 10m
Trip: 16 days
7.4GoodShow reviews
Overall 7.4 Good
Based on 6710 reviews
Overall
7.6
Boarding
7.3
Comfort
7.4
Crew
8.1
Entertainment
7.7
Food
6.3
SEA
KEF
Excellent 8.0

Blankets and pillows at each seat

Only one drink service on a very long flight. very expensive food choices.

BOS
KEF
Good 7.6

They provided a pillow and blanket which was very nice, and the crew were helpful in finding space for items during take-off and landing. The boarding and exiting were fairly quick.

Everything on board costs extra, including basic drinks and snacks, but that's to be expected on cheaper flights. I assumed that the inflight movies cost money as well, although I didn't watch any because I didn't have headphones.

KEF
OSL
Excellent 8.0

We were ahead of schedule, which was nice

BRU
KEF
Excellent 10.0

My exit aisle seat was just great, with no one on either side of me !!!!! Very kind airplane staff. I had a great sleep.

nothing

KEF
EWR
Mediocre 2.8

My entertainment system stopped working 1/2 way through the flight and there was very little leg room that caused back pain

Mon, Jul 2
LHR
IAD
30h 00m
Mon, Jul 16
IAD
LHR
29h 50m
Trip: 15 days
8.0ExcellentShow reviews
Overall 8.0 Excellent
Based on 18051 reviews
Overall
8.0
Boarding
7.9
Comfort
7.8
Crew
8.3
Entertainment
8.1
Food
7.9
ATL
IST
Excellent 10.0

New airplane good service good flight attendant depart on time

IST
BOS
Mediocre 3.3

Priority boarding was messed-up - no queue discipline was even attempted by the gate staff. The business class seats were uncomfortable and not comfortable to sleep in. The footrest was not long enough and the feet were dangling in the air. The blanket and bedding was provided almost 3 hours after take-off Worst of all was baggage handling. Our luggage was severely damaged. The handle to the suitcases was torn off. In addition the bags and the contents were wet when we received them in Boston. IT had been raining in Istanbul and it seems the bags were left out in the open. I've been trying to get Turkish to repair the torn-off handles but I'm constantly hitting a wall. I have filed a claim but the support staff sends extremely brief denials with no explanation.

ORD
IST
Excellent 10.0

2nd time with Turkish Airlines; no concerns. Everything handled timely and professionally.

JFK
IST
Excellent 8.3

I did like the food, very nice stuff.

I order some to help to find my gate for a another international flight,but no one came. For such long flight, definitely need to have sits with more space. Very hard to flight in such tight space

IST
ORD
Excellent 9.6

The flight itself was very nice quality again. Crew was very friendly, priority boarding for international business. pod seating was super comfortable.

No alcohol beverage service before take off. One of the only airlines that does this. Also flight was delayed again in Istanbul. We were delayed on our layover in, and out of Istanbul. Both times stuck on the tarmac. I see this as a common problem

Thu, Mar 1
STN
IAD
25h 05m
Sun, Mar 4
IAD
STN
20h 05m
Trip: 4 days
Overall 0.0 Poor
Based on 0 reviews
Tue, Apr 10
LHR
IAD
10h 45m
Mon, Apr 16
IAD
LHR
10h 20m
Trip: 7 days
7.8GoodShow reviews
Overall 7.8 Good
Based on 1746 reviews
Overall
8.0
Boarding
8.0
Comfort
7.7
Crew
8.5
Entertainment
7.1
Food
7.4
AMS
LAX
Okay 4.0

The cabin crew were pretty good. That's about all that was good.

I paid almost $400 for upgraded seats. When I got to the airport-- no seats-- both ways!! i didn't even have regular seat assignments. I had to choose from the last few seats available. The ticket agent, the gate agent and the cabin crew all did nothing to make up for the fact that their system screwed up and stuck me in a cramped coach seat in the back of the plane for 11 hours-- TWICE! Beyond that, KLM must have one of the oldest fleets in the sky. Both ways LAX->AMS->LAX, I was on a 30-35 year old 747 with no wifi, no power and a ten-year-old entertainment system. Never again.

LAX
AMS
Mediocre 2.0

My bagage broke

I paid extra fee for extra bagage which was tv and i paid insurance my tv broke and no one responces for it

AMS
NCL
Good 7.6

Pretty basic one hour flight so there's not much to complain about or praise about. I got some sleep which was good.

The crew had their general Dutch aloofness on form. Chatted to one of the stewardesses in Dutch up until she saw I had a British passport then she decided she could only speak English to me.

AMS
BLL
Good 6.5

Nice seats, comfortable.

Again, no aisle seat for SkyTeam Gold member. Also, my baggage was lost. First bag arrived a day late, second after I had left Billund and it was six days before the bag with my clothes reached me. I was told I will have 100 euro credit for clothing, but in the winter and for 6 days, this was not even close to the amount I needed for clothing and necessities, to have my time here.

AMS
TPE
Excellent 9.3

Service impeccable!

They have one line of executive class after the kitchen and toilet, is very noisy.

Wed, Apr 18
STN
IAD
33h 34m
Tue, May 1
IAD
STN
39h 05m
Trip: 14 days
Overall 0.0 Poor
Based on 0 reviews
Thu, Mar 1
LHR
IAD
10h 45m
Tue, Mar 6
IAD
LHR
9h 35m
Trip: 6 days
7.4GoodShow reviews
Overall 7.4 Good
Based on 4246 reviews
Overall
7.6
Boarding
7.7
Comfort
7.3
Crew
8.0
Entertainment
7.0
Food
6.9
LHR
DUB
Excellent 8.0

Staff and service

BOS
DUB
Okay 5.3

AER LINGUS complimentary water not offered . seats small padding marginal.food offerings compared to other air lines LOW QUALITY

DUB
YYZ
Okay 4.0

Having had bad experiences with Aer Lingus before, I was hesitant to book with Aer Lingus again. But sadly, I was booking this flight last minute and had no other option. The route was Dublin to Calgary, via Toronto. I left myself plenty of time im Toronto to clear customs as I know it can take a while. The day of, the flight ended up being 1.5 hours longer than usual due to headwinds, leaving me with only 2.5 hours in Toronto. I ended up waiting 2 hours and 15 minutes for my bag and missing my connecting flight (my sister who was also on the same flight received hers in 30 mins and made the flight). Westjet was wonderful and put me on a later flight but Aer Lingus didn't have any assistance for me.

Aer Lingus lost my sister's luggage going to Ireland and never contacted my sister once the luggage was found. She only received it the day we flew back to Calgary. Poor customer service when inquiring about the bag, no compensation for necessities purchased.

YYZ
DUB
Excellent 8.3

I flew overnight from Toronto, Canada to Dublin and had a relatively pleasant experience. The food and drink trolleys came by quite quickly and frequently, and the food exceeded my expectations. The crew was friendly, for the most part. Boarding certainly could've been smoother... But overall, I'd fly Aer Lingus again for an overseas trip.

BOS
DUB
Excellent 9.6

Girl sitting beside me!

Guy sitting behind me!

Tue, Apr 10
LCY
IAD
10h 40m
Mon, Apr 16
IAD
LCY
10h 50m
Trip: 7 days
7.8GoodShow reviews
Overall 7.8 Good
Based on 1746 reviews
Overall
8.0
Boarding
8.0
Comfort
7.7
Crew
8.5
Entertainment
7.1
Food
7.4
AMS
BLL
Good 6.5

Nice seats, comfortable.

Again, no aisle seat for SkyTeam Gold member. Also, my baggage was lost. First bag arrived a day late, second after I had left Billund and it was six days before the bag with my clothes reached me. I was told I will have 100 euro credit for clothing, but in the winter and for 6 days, this was not even close to the amount I needed for clothing and necessities, to have my time here.

AMS
HUY
Excellent 8.6

The last two times we connected in Amsterdam to Humberside our luggage was delayed. This time it wasn’t. The simple things give the greatest satisfaction

DMM
AMS
Okay 5.6

Tiny old cramped plane.

IAD
AMS
Good 7.3

787 is a great airplane. The 3-3-3 seat configuration leaves enough seat width to be just comfortable in coach.

LAX
AMS
Mediocre 2.0

My bagage broke

I paid extra fee for extra bagage which was tv and i paid insurance my tv broke and no one responces for it

Fri, Aug 31
LGW
IAD
11h 00m
Mon, Sep 3
IAD
LGW
10h 05m
Trip: 4 days
7.4GoodShow reviews
Overall 7.4 Good
Based on 6710 reviews
Overall
7.6
Boarding
7.3
Comfort
7.4
Crew
8.1
Entertainment
7.7
Food
6.3
BOS
KEF
Good 7.6

They provided a pillow and blanket which was very nice, and the crew were helpful in finding space for items during take-off and landing. The boarding and exiting were fairly quick.

Everything on board costs extra, including basic drinks and snacks, but that's to be expected on cheaper flights. I assumed that the inflight movies cost money as well, although I didn't watch any because I didn't have headphones.

SEA
KEF
Excellent 8.0

Blankets and pillows at each seat

Only one drink service on a very long flight. very expensive food choices.

KEF
EWR
Mediocre 2.8

My entertainment system stopped working 1/2 way through the flight and there was very little leg room that caused back pain

CDG
KEF
Excellent 9.3

Food options

KEF
BOS
Excellent 8.6

Crew was friendly, like the bigger plane and direct flight.

Luggage fees!!!

Wed, Feb 21
LHR
IAD
28h 25m
Sat, Feb 24
IAD
LHR
35h 56m
Trip: 4 days
9.1ExcellentShow reviews
Overall 9.1 Excellent
Based on 6 reviews
Overall
8.2
Boarding
8.1
Comfort
7.9
Crew
8.5
Entertainment
7.8
Food
7.7
BOS
FRA
Excellent 10.0

Room to stretch out in, the benefit of extra space on the tray; relaxed crew, and quiet co-travelers.

Nothing to not like. Wish all flights would be like that.

BOS
FRA
Good 7.6

Crew

BOM
FRA
Excellent 8.3

Smooth and comfortable flight . Awesome service by the crew

SEA
FRA
Excellent 8.3

On time Boarding was convenient

Food Seats

BOS
MUC
Okay 4.0

Worst food ever. Stewardess could not figure out where my seat was . Seemed unfamiliar with the plane.

Fri, May 18
LGW
IAD
12h 21m
Tue, Jun 5
IAD
LGW
11h 40m
Trip: 19 days
Overall 0.0 Poor
Based on 0 reviews
Mon, Feb 26
LGW
IAD
11h 35m
Sun, Mar 4
IAD
LGW
9h 55m
Trip: 7 days
7.4GoodShow reviews
Overall 7.4 Good
Based on 4246 reviews
Overall
7.6
Boarding
7.7
Comfort
7.3
Crew
8.0
Entertainment
7.0
Food
6.9
DUB
GVA
Good 6.0

NO COMPLIMENTARY WATER OR COFFEE. SEATS larger and MORE COMFORTABLE

BCN
DUB
Good 7.0

Crew nice. Space was better than most. Felt like Jet Blue.

No snack on 3 he flight ok I guess but....Lack of free beverage?

DUB
JFK
Excellent 10.0

All worked smoothly

Service and friendliness

BOS
DUB
Excellent 9.6

Girl sitting beside me!

Guy sitting behind me!

DUB
BOS
Good 7.0

Pleasant crew and good food/snack service almost forgotten as I stood at the baggage carousel for 40 minutes.

Baggage claim very frustrating (40 minutes) particularly after 12 hours of airports and airplanes. Messed up our ground transportation plans for no apparent reason. Totally unexplained!

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London to Washington Dulles Intl Flight Information

Avg. Flight Duration 8h 02m
Flights Arrive in Washington Dulles Intl
Flights Depart from London
Flight Price $540
Distance 3680 miles
Airlines KLM, United, SWISS, Austrian Airlines, Aer Lingus, Primera Air Scandinavia, Lufthansa, Virgin Atlantic, Icelandair, Turkish Airlines
*
Prices are per person and are for e–tickets and include all taxes & fees in USD.

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The fares displayed include all taxes and fees for economy class travel and were found by the provider in the last 72 hours. Seats are limited and may not be available on all flights and days. Fares are subject to change and may not be available on all flights or dates of travel. Some carriers charge additional fees for extra checked bags. Please check the carriers' sites.