$243 Cheap Flights from Washington (IAD) to London (LHR)

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Cheap Flights from Washington to London (IAD-LHR)

Prices were available within the past 7 days and start at $243 for one-way flights and $412 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

TAP Portugal
Sat, Nov 16 - Sat, Nov 23
IAD
Washington
LHR
London
$412 Roundtrip, just found
$412
Roundtrip
just found
Select TAP Portugal flight, departing Sat, Nov 16 from Washington to London, returning Sat, Nov 23, priced at $412 just found
Iberia
Sun, Sep 29 - Fri, Oct 11
IAD
Washington
LHR
London
$458 Roundtrip, found 2 hours ago
$458
Roundtrip
found 2 hours ago
Select Iberia flight, departing Sun, Sep 29 from Washington to London, returning Fri, Oct 11, priced at $458 found 2 hours ago
Scandinavian Airlines
Sat, Mar 1 - Sat, Mar 8
IAD
Washington
LHR
London
$461 Roundtrip, found 2 hours ago
$461
Roundtrip
found 2 hours ago
Select Scandinavian Airlines flight, departing Sat, Mar 1 from Washington to London, returning Sat, Mar 8, priced at $461 found 2 hours ago
Virgin Atlantic
Tue, Dec 31 - Wed, Jan 8
IAD
Washington
LHR
London
$469 Roundtrip, found 2 hours ago
$469
Roundtrip
found 2 hours ago
Select Virgin Atlantic flight, departing Tue, Dec 31 from Washington to London, returning Wed, Jan 8, priced at $469 found 2 hours ago
British Airways
Mon, Nov 25 - Wed, Dec 4
IAD
Washington
LHR
London
$476 Roundtrip, found 3 days ago
$476
Roundtrip
found 3 days ago
Select British Airways flight, departing Mon, Nov 25 from Washington to London, returning Wed, Dec 4, priced at $476 found 3 days ago
Air Canada
Sat, Mar 29 - Fri, Apr 11
IAD
Washington
LHR
London
$476 Roundtrip, found 5 hours ago
$476
Roundtrip
found 5 hours ago
Select Air Canada flight, departing Sat, Mar 29 from Washington to London, returning Fri, Apr 11, priced at $476 found 5 hours ago
Swiss International Air Lines
Sun, Sep 29 - Fri, Oct 11
IAD
Washington
LHR
London
$477 Roundtrip, found 2 hours ago
$477
Roundtrip
found 2 hours ago
Select Swiss International Air Lines flight, departing Sun, Sep 29 from Washington to London, returning Fri, Oct 11, priced at $477 found 2 hours ago
Lufthansa
Tue, Dec 3 - Tue, Dec 17
IAD
Washington
LHR
London
$482 Roundtrip, found 4 days ago
$482
Roundtrip
found 4 days ago
Select Lufthansa flight, departing Tue, Dec 3 from Washington to London, returning Tue, Dec 17, priced at $482 found 4 days ago
Austrian Airlines
Mon, Nov 4 - Wed, Nov 13
IAD
Washington
LHR
London
$487 Roundtrip, found 5 hours ago
$487
Roundtrip
found 5 hours ago
Select Austrian Airlines flight, departing Mon, Nov 4 from Washington to London, returning Wed, Nov 13, priced at $487 found 5 hours ago
Brussels Airlines
Tue, Aug 13 - Thu, Aug 29
IAD
Washington
LHR
London
$528 Roundtrip, found 2 hours ago
$528
Roundtrip
found 2 hours ago
Select Brussels Airlines flight, departing Tue, Aug 13 from Washington to London, returning Thu, Aug 29, priced at $528 found 2 hours ago
Flights from Washington (IAD) to London (LHR)
Origin airport
Washington Dulles Intl.
Destination airport
Heathrow
Airlines serving
Aer Lingus, Air Canada, Air France, American Airlines, Austrian Airlines, British Airways, Brussels Airlines, Delta, Finnair, Iberia, Icelandair, KLM, Lufthansa, Royal Air Maroc, Scandinavian Airlines, Swiss International Air Lines, TAP Portugal, Turkish Airlines, United, Virgin Atlantic
Roundtrip price
$411
Distance
3666 mi
Average flight time
12 hours 17 mins

Washington to London Flights

Whether you’re looking for a grand adventure or just want to get away for a last-minute break, flights from Washington to London offer the perfect respite. Not only does exploring London provide the chance to make some magical memories, dip into delectable dishes, and tour the local landmarks, but the cheap airfare means you won’t bust your budget. So no matter whether your ideal itinerary involves flying one way, non-stop, or round trip, you’re bound to find flights that match your schedule on Expedia, and at prices that won’t shock your wallet.

Bagging a cheap flight from Washington to London may mean more dollars to spend on for one-of-a-kind souvenirs when you arrive, but it doesn’t mean you have to skimp on your travel experience, as Expedia offers a sizzling selection of cheap airlines that’ll put you in your happy place on their planes, whether that’s getting lost in a hair-raising airport thriller, dreaming on the passing landscape over a glass of bubbly, or jotting down your vacation bucket list at 38,000 feet. There’s also bound to be plenty of opportunities to snap a few photos of the high life that will make your friends green with envy. After all, enjoying the journey is part of the fun.

With so many affordable flights and so many wonderful adventures awaiting you, there’s no reason to put off booking a fantastic flight from IAD to LHR today. So don’t leave it to the last minute to make your dream trip a reality: pack your bags with your go-to travel accessories, put together your list of must-see attractions and can’t-miss activities, and get ready to broaden your horizons – with Expedia, the wonders of London are only a plane trip away. Book your travel arrangements with us today!

If you would like to book flights to London more flexibly many prefer to purchase one-way tickets with options to take different airlines. A one way ticket to London is $243 now!

Frequently asked questions

How much is a one-way flight from IAD to LHR?
You can bag one-way Washington flights to London starting from only $259. This info is based on the lowest price found on Expedia for this route departing within the next three months and was last updated on May 20 2024 and has not changed since. This specific airfare is for an Icelandair service, departing from Washington Dulles Intl. Airport (IAD) on August 7 2024 and arriving at Heathrow Airport (LHR).
How long does it take to fly from IAD to Heathrow Airport?
With United Airlines, a direct flight takes approximately 7 hours and 20 minutes. Take the 5:35PM flight from Dulles Intl. Airport and come in to land at London Heathrow at 5:55AM. Get your hands on an epic deal on this route when you use Expedia to book your journey.
Is it cheaper to buy a plane ticket from IAD to LHR last minute?
When it’s time to book your flights, it pays to be prepared. While you may be able to score a deal on an IAD to LHR flight at the last minute, fares usually don’t get cheaper as the date of departure nears. Based on flight pricing and demand studies in 2022, we have found that the sweet spot to book a domestic flight is between 28 – 35 days ahead. For international flights it’s three to four months.
What is the cheapest airline flying from Dulles Intl. Airport to Heathrow Airport (LHR) in the next 90 days?
With fares starting from $259 for a flight from Washington to London, Icelandair is the cheapest airline found on Expedia. This price is based on airfares found on Expedia departing within the next 90 days and was updated on May 20 2024 and has not changed since. The flight takes off from Dulles Intl. Airport on August 7 2024 and arrives at LHR.
What's the cheapest price for a flight from Washington Dulles Intl. Airport (IAD) to London Heathrow next month?
The best price for a one-way flight from Washington to London within the next month is $459. If you plan to travel soon, lock in this fare before it’s gone. This price was found after looking at all available flights on Expedia departing within the next 30 days. This fare is for a one-way Air Canada flight journeying from Dulles Intl. Airport on May 21 2024 and touching down at Heathrow Airport (LHR). The price was last updated on May 20 2024 and has not changed since.
What airline has the least delays from IAD to LHR?
Depart with United Airlines from Dulles Intl. Airport to Heathrow Airport (LHR) and you’re more likely to land at the time found on your plane ticket. This airline clinches first place on this route, with 79% of services arriving on time. If there is a delay to your flight, the free Expedia App is a great way to stay in the loop. Download it and you’ll get real-time trip updates, from flight delays to gate number changes and which carousel to collect your luggage.
What airports do you fly into for London from Sterling?
From Sterling, you can travel to London via Heathrow Airport (LHR), London City Airport (LCY) and Gatwick Airport (LGW). Determine which terminal is more convenient for you before making your decision. If you go with Heathrow Airport (LHR), it’s approximately 14 mi west of the downtown area. Use the cash you save when booking your fare with Expedia to uncover the city’s popular attractions, such as Buckingham Palace and Big Ben.
What are the most popular departure times for flights from Dulles Intl. Airport to London Heathrow?
For Virgin Atlantic flights jetting from IAD to Heathrow Airport, the most popular departure times are between 6:00 PM - 7:00 PM. If you’d like to avoid any holdups, head out in the morning. This way you can avoid air traffic that builds up around airports in the afternoon and evening.
Can I change the date of my flight from IAD to Heathrow Airport (LHR)?
It’s a snap to make amendments to your IAD to Heathrow Airport (LHR) journey yourself. Just go to the Expedia Trips portal and hit “change flight.” Search for new flights and secure the one that works with your new plans. You’ll see an estimate of applicable flight change fees. You can also head to our Customer Service portal to chat to our Virtual Agent and get answers to your questions.
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