How far in advance should I book tickets for a flight with British Airways from Washington, D.C. Dulles Intl Airport to London Heathrow Airport?

Generally, when trying to get a below average price for your ticket, try to book around 4 days before departure. For the cheapest possible price, our data suggests booking 72 days before departure.

Is British Airways the cheapest airline to fly with from Washington, D.C. Dulles Intl Airport to London Heathrow Airport?

With an average price of $768 return, British Airways is not the cheapest airline to fly from Washington, D.C. Dulles Intl Airport to London Heathrow Airport with. Instead, for the lowest price, our data suggests flying with TAP AIR PORTUGAL, where a return flight costs $566 on average.

Does British Airways fly direct to London Heathrow Airport from Washington, D.C. Dulles Intl Airport?

Yes, British Airways does offer direct flights for the route, with around 14 flights per week.

$372 Cheap British Airways Flights from Washington, D.C. Dulles Intl Airport to London Heathrow Airport

IAD - LHR

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Cheap British Airways Flight Deals from Washington, D.C. Dulles Intl Airport to London Heathrow Airport

Here are some of the best deals found on KAYAK recently from British Airways for round-trip flights from Washington, D.C. Dulles Intl Airport to London Heathrow Airport 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.

Round-trip

One-way

Last minute

Direct

Recent round-trip British Airways flight deals from Washington, D.C. Dulles Intl Airport to London Heathrow Airport

Tue, Dec 30 - Tue, Jan 13

9:45 pm - 10:00 am

IAD

LHR

7h 15mnonstop

12:10 pm - 3:35 pm

LHR

IAD

8h 25mnonstop

$612British Airways

Wed, Dec 31 - Wed, Jan 14

9:45 pm - 10:00 am

IAD

LHR

7h 15mnonstop

12:10 pm - 3:35 pm

LHR

IAD

8h 25mnonstop

$613British Airways

Fri, Jan 23 - Tue, Jan 27

6:20 pm - 6:30 am

IAD

LHR

7h 10mnonstop

12:10 pm - 3:35 pm

LHR

IAD

8h 25mnonstop

$619British Airways

Thu, Mar 5 - Mon, Mar 9

9:45 pm - 10:00 am

IAD

LHR

7h 15mnonstop

12:10 pm - 4:35 pm

LHR

IAD

8h 25mnonstop

$620British Airways

Wed, Mar 18 - Thu, Mar 26

7:20 pm - 6:30 am

IAD

LHR

7h 10mnonstop

4:25 pm - 8:55 pm

LHR

IAD

8h 30mnonstop

$624British Airways

Sun, Jan 11 - Wed, Jan 21

9:45 pm - 10:00 am

IAD

LHR

7h 15mnonstop

4:25 pm - 7:55 pm

LHR

IAD

8h 30mnonstop

$627British Airways

Thu, Jan 29 - Sun, Feb 1

9:45 pm - 10:00 am

IAD

LHR

7h 15mnonstop

4:25 pm - 7:55 pm

LHR

IAD

8h 30mnonstop

$628British Airways

Thu, Jan 15 - Sun, Feb 15

6:20 pm - 6:30 am

IAD

LHR

7h 10mnonstop

12:10 pm - 3:35 pm

LHR

IAD

8h 25mnonstop

$631British Airways

Tue, Dec 30 - Thu, Jan 15

9:45 pm - 10:00 am

IAD

LHR

7h 15mnonstop

4:25 pm - 7:55 pm

LHR

IAD

8h 30mnonstop

$633British Airways

Fri, Jan 23 - Fri, May 15

9:45 pm - 10:00 am

IAD

LHR

7h 15mnonstop

2:00 pm - 5:25 pm

LHR

IAD

8h 25mnonstop

$634British Airways

Useful Info

Low season	February
High season	July
Cheapest flight	$372
Average price round-trip	$826

Best time to beat the crowds with an average 7% drop in price.

Most popular time to fly with an average 7% increase in price.

Flight from Washington Dulles Airport to London Heathrow Airport

(price for this month)

When to Book Flights with British Airways from Washington, D.C. Dulles Intl Airport to London Heathrow Airport

Average price per month

Flight prices as travel date approaches

How far in advance should I book tickets for a flight with British Airways from Washington, D.C. Dulles Intl Airport to London Heathrow Airport?
Generally, when trying to get a below average price for your ticket, try to book around 4 days before departure. For the cheapest possible price, our data suggests booking 72 days before departure.
Is British Airways the cheapest airline to fly with from Washington, D.C. Dulles Intl Airport to London Heathrow Airport?
With an average price of $768 return, British Airways is not the cheapest airline to fly from Washington, D.C. Dulles Intl Airport to London Heathrow Airport with. Instead, for the lowest price, our data suggests flying with TAP AIR PORTUGAL, where a return flight costs $566 on average.
What is the cheapest British Airways flight from Washington, D.C. Dulles Intl Airport to London Heathrow Airport?
In the last 3 days, the lowest price for a flight with British Airways from Washington, D.C. Dulles Intl Airport to London Heathrow Airport was $549 for a return flight and $350 for a one-way flight.
Does British Airways fly direct to London Heathrow Airport from Washington, D.C. Dulles Intl Airport?
Yes, British Airways does offer direct flights for the route, with around 14 flights per week.
What’s the cheapest day of the week to fly from Washington, D.C. Dulles Intl Airport to London Heathrow Airport with British Airways?
On average, the cheapest day of the week to fly from Washington, D.C. Dulles Intl Airport to London Heathrow Airport with British Airways is Monday, when prices are around $365. The most expensive day is generally Thursday, where the average price is around $443.
What’s the cheapest month to fly from Washington, D.C. Dulles Intl Airport to London Heathrow Airport with British Airways?
The cheapest month for British Airways flights to London Heathrow Airport from Washington, D.C. Dulles Intl Airport is generally March, where plane tickets cost $438 on average. If possible, try to avoid the most expensive months of April and June, where tickets cost $582 and $746 respectively.

6.7

Okay7,574 verified ratings

6.4Entertainment

6.4Food

6.9Boarding

7.6Crew

6.7Comfort

Pros +

Crew was super polite and attentive. (in 1072 reviews)

Cons -

Customer Service is Dead with British Airways! (in 284 reviews)

10.0 Wonderful

Tarig, Dec 2025

CAI

LHR

The update about flights and the terminal changes information was great.

10.0 Wonderful

Firuz, Dec 2025

FRA

LCY

I love FRA - LCY route. So much better compared to the FRA - LHR route and the price differential is ZERO

8.0 Very good

Firuz, Dec 2025

LHR

FRA

Good service and on time

8.0 Very good

Verified traveler, Dec 2025

LHR

DXB

Nice lounge but had a 5 hour layover which is a lot

8.0 Very good

Verified traveler, Dec 2025

SFO

LHR

Check in was was and the agent was very friendly and helpful The lounge was nice...boarding was straight from the lounge Everything worked at our seats, and video entertainment was good ..food was mediocre

10.0 Wonderful

Tarig, Dec 2025

LHR

CAI

British American airline

10.0 Wonderful

Tarig, Dec 2025

DFW

LHR

Smooth and easy service was great

2.0 Poor

Verified traveler, Dec 2025

DFW

LHR

Delayed by 5.5 hours

8.0 Very good

Verified traveler, Dec 2025

LHR

JER

Flight on time and priority boarding worked. I travelled economy although business was available as no flights are cheap these days and at least with BA loyalty card I get a baggage allowance for nothing. That made the flight comparable or even cheaper than the ‘budget’ alternative. As for catering and entertainment - not on a BA short haul economy ! At least we were offered biscuits and water! Catering for economy short haul has been reduced to the minimum - no tea or coffee or other drinks than water (from a large bottle with a paper cup on offer). They will say this is better for the environment, which it is, but proper waste management is still needed for empty packets etc. so actually it’s a money saver.

10.0 Wonderful

Tony, Dec 2025

PHX

LHR

The flight was excellent in World Travellor plus. Well worth the extra money. Boarding at Phoenix was the usual poorly organized event. Very stressful.

Everything you need to know for your flight from Washington, D.C. Dulles Intl Airport to London Heathrow Airport

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Delta flights from Washington, D.C. Dulles Intl Airport to London Heathrow Airport

IAD - LHR

$372 Find Cheap British Airways Flights from Washington, D.C. Dulles Intl Airport to London Heathrow Airport

Search hundreds of travel sites at once for deals on British Airways flights from Washington, D.C. Dulles Intl Airport to London Heathrow Airport

Cheap British Airways Flight Deals from Washington, D.C. Dulles Intl Airport to London Heathrow Airport

Recent round-trip British Airways flight deals from Washington, D.C. Dulles Intl Airport to London Heathrow Airport

Recent one-way British Airways flight deals from Washington, D.C. Dulles Intl Airport to London Heathrow Airport

Recent last minute British Airways flight deals from Washington, D.C. Dulles Intl Airport to London Heathrow Airport

Recent direct British Airways flight deals from Washington, D.C. Dulles Intl Airport to London Heathrow Airport

Good to know

When to Book Flights with British Airways from Washington, D.C. Dulles Intl Airport to London Heathrow Airport

FAQs for flying to London Heathrow Airport with British Airways

How far in advance should I book tickets for a flight with British Airways from Washington, D.C. Dulles Intl Airport to London Heathrow Airport?

Generally, when trying to get a below average price for your ticket, try to book around 4 days before departure. For the cheapest possible price, our data suggests booking 72 days before departure.

Is British Airways the cheapest airline to fly with from Washington, D.C. Dulles Intl Airport to London Heathrow Airport?

With an average price of $768 return, British Airways is not the cheapest airline to fly from Washington, D.C. Dulles Intl Airport to London Heathrow Airport with. Instead, for the lowest price, our data suggests flying with TAP AIR PORTUGAL, where a return flight costs $566 on average.

What is the cheapest British Airways flight from Washington, D.C. Dulles Intl Airport to London Heathrow Airport?

In the last 3 days, the lowest price for a flight with British Airways from Washington, D.C. Dulles Intl Airport to London Heathrow Airport was $549 for a return flight and $350 for a one-way flight.

Does British Airways fly direct to London Heathrow Airport from Washington, D.C. Dulles Intl Airport?

Yes, British Airways does offer direct flights for the route, with around 14 flights per week.

What’s the cheapest day of the week to fly from Washington, D.C. Dulles Intl Airport to London Heathrow Airport with British Airways?

On average, the cheapest day of the week to fly from Washington, D.C. Dulles Intl Airport to London Heathrow Airport with British Airways is Monday, when prices are around $365. The most expensive day is generally Thursday, where the average price is around $443.

What’s the cheapest month to fly from Washington, D.C. Dulles Intl Airport to London Heathrow Airport with British Airways?

The cheapest month for British Airways flights to London Heathrow Airport from Washington, D.C. Dulles Intl Airport is generally March, where plane tickets cost $438 on average. If possible, try to avoid the most expensive months of April and June, where tickets cost $582 and $746 respectively.

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Everything you need to know for your flight from Washington, D.C. Dulles Intl Airport to London Heathrow Airport

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Top British Airways flights

The most popular destinations for flights with British Airways according to clicks from KAYAK users. Prices are the lowest found on KAYAK over the last 7 days. Price and availability is not guaranteed.

Cabin class types available on flights to London Heathrow Airport

Cabin classes available on flights to Washington, D.C. Dulles Intl Airport. Prices are the lowest found on KAYAK over the last 7 days. Price and availability is not guaranteed.

Complete your trip to London Heathrow Airport with a hotel stay or car rental

Flights to other popular destinations

The most popular flights on KAYAK according to clicks in the last 2 weeks. Prices are the lowest found on KAYAK over the last 7 days. Price and availability is not guaranteed.

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