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Cheap flights from Boston to Washington, D.C. Dulles Intl Airport from £66

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 7/6. Fares are subject to change and may not be available on all flights or dates of travel.
BOS — IAD
24 May — 31 May1
1 adult
1 adult, Economy, 0 bags
Cheapflights Tip: The best prices from Boston Logan Intl to Washington, D.C. Dulles Intl are usually found in December or January, booked 68 days in advance, depart on a Tuesday or Monday and return on a Monday

Cheap flight deals from Boston to Dulles Intl

Enter your travel dates to find the best prices.

Cheapest flights from Boston to Dulles Intl
Explore the most affordable flight options available from Boston to Dulles Intl. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 24 April 2026.

Tue 26/519:00
BOS
-
IAD
1 stop4h 19m
United Airlines
Thu 28/522:10
IAD
-
BOS
Nonstop1h 49m
United Airlines
Deal found 23/4£125
Wed 13/505:45
BOS
-
IAD
Nonstop1h 39m
United Airlines
Tue 19/508:35
IAD
-
BOS
Nonstop1h 43m
United Airlines
Deal found 20/4£130
Tue 19/505:45
BOS
-
IAD
Nonstop1h 39m
United Airlines
Fri 29/522:10
IAD
-
BOS
Nonstop1h 49m
United Airlines
Deal found 23/4£130
Thu 7/505:45
BOS
-
IAD
Nonstop1h 39m
United Airlines
Mon 11/522:15
IAD
-
BOS
Nonstop1h 44m
United Airlines
Deal found 19/4£131
Tue 2/606:00
BOS
-
IAD
1 stop5h 28m
United Airlines
Tue 2/622:10
IAD
-
BOS
Nonstop1h 49m
United Airlines
Deal found 22/4£132
Fri 8/505:45
BOS
-
IAD
Nonstop1h 39m
United Airlines
Tue 12/508:35
IAD
-
BOS
Nonstop1h 43m
United Airlines
Deal found 20/4£137
Fri 8/505:45
BOS
-
IAD
Nonstop1h 39m
United Airlines
Mon 11/522:15
IAD
-
BOS
Nonstop1h 44m
United Airlines
Deal found 20/4£138
Tue 5/519:26
BOS
-
IAD
1 stop3h 59m
United Airlines
Wed 6/517:10
IAD
-
BOS
Nonstop1h 54m
United Airlines
Deal found 20/4£139
Thu 28/509:30
BOS
-
IAD
Nonstop1h 42m
United Airlines
Mon 1/622:10
IAD
-
BOS
Nonstop1h 49m
United Airlines
Deal found 20/4£139
Sat 9/505:45
BOS
-
IAD
Nonstop1h 39m
United Airlines
Mon 18/522:15
IAD
-
BOS
Nonstop1h 44m
United Airlines
Deal found 23/4£140
Wed 13/505:45
BOS
-
IAD
Nonstop1h 39m
United Airlines
Mon 18/522:15
IAD
-
BOS
Nonstop1h 44m
United Airlines
Deal found 20/4£141

Find flight deals from Boston to Dulles Intl

Discover tips and strategies to find the most affordable flight options for your journey from Boston (BOS) to Dulles Intl (IAD). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated 24 April 2026.

Round-trip from

£125

One-way from

£66

Popular in

June

Cheapest in

December

Average price

£242
United Airlines
  • United Airlines
  • 26/5-28/5
  • 1 total stop
  • 6h 08m total
  • Boston to Washington, D.C.
Search Deals
United Airlines
  • United Airlines
  • 10/5
  • Nonstop
  • 1h 39m total
  • Boston to Washington, D.C.
Search Deals
Highest demand for flights based on searches. 1% potential increase in price (£3 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease (£3 potential savings vs. average return price).
Search Deals
Average for round-trip flights in April 2026
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Cheapflights Fare Finder

 
Customise your flight search to find flights from Boston to Dulles Intl that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 858,174 searches. Data last updated 24 April 2026.
Use the filters below to find and compare flights from Boston to Washington, D.C. Dulles Intl Airport that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

BostonWashington, D.C.

BOS - IAD

BOSIAD

Boston Logan Intl

Tue 2/6

11:00-16:32

1 stop5h 32m

Washington, D.C. Dulles Intl

Sun 7/6

22:10-23:59

Nonstop1h 49m

£125

BostonWashington, D.C.

BOS - IAD

BOSIAD

Boston Logan Intl

Tue 12/5

11:27-16:27

1 stop5h 00m

Washington, D.C. Dulles Intl

Wed 13/5

08:35-10:18

Nonstop1h 43m

£139
Fastest return journey

BostonWashington, D.C.

BOS - IAD

BOSIAD

Boston Logan Intl

Fri 15/5

19:26-23:25

1 stop3h 59m

Washington, D.C. Dulles Intl

Mon 18/5

22:15-23:59

Nonstop1h 44m

£149

BostonWashington, D.C.

BOS - IAD

BOSIAD

Boston Logan Intl

Thu 23/7

10:58-16:32

1 stop5h 34m

Washington, D.C. Dulles Intl

Sun 26/7

22:10-23:59

Nonstop1h 49m

£168

BostonWashington, D.C.

BOS - IAD

BOSIAD

Boston Logan Intl

Fri 7/8

06:00-11:28

1 stop5h 28m

Washington, D.C. Dulles Intl

Sat 8/8

22:10-23:59

Nonstop1h 49m

£168

BostonWashington, D.C.

BOS - IAD

BOSIAD

Boston Logan Intl

Sun 19/7

05:45-07:23

Nonstop1h 38m

Washington, D.C. Dulles Intl

Sun 26/7

06:33-11:16

1 stop4h 43m

£168

BostonWashington, D.C.

BOS - IAD

BOSIAD

Boston Logan Intl

Sat 25/7

06:00-11:28

1 stop5h 28m

Washington, D.C. Dulles Intl

Wed 29/7

08:25-13:16

1 stop4h 51m

£176

BostonWashington, D.C.

BOS - IAD

BOSIAD

Boston Logan Intl

Fri 15/5

19:26-23:25

1 stop3h 59m

Washington, D.C. Dulles Intl

Sat 16/5

22:15-23:59

Nonstop1h 44m

£176

BostonWashington, D.C.

BOS - IAD

BOSIAD

Boston Logan Intl

Fri 8/5

06:00-12:18

1 stop6h 18m

Washington, D.C. Dulles Intl

Fri 8/5

19:33-23:37

1 stop4h 04m

£191

BostonWashington, D.C.

BOS - IAD

BOSIAD

Boston Logan Intl

Wed 27/5

07:30-11:28

1 stop3h 58m

Washington, D.C. Dulles Intl

Mon 1/6

22:10-23:59

Nonstop1h 49m

£191

Flights are sorted by cheapest return flights first.

Deals found on 20/4

Showing 1-10 of 23 resultsSorted by cheapest first
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Best time to book a flight from Boston to Dulles Intl

Have a flexible travel schedule? Discover the best time to fly to Dulles Intl from Boston with our price prediction graph.
Estimated return price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from Boston to Washington, D.C. Dulles Intl Airport

How far ahead should I book a flight from Boston to Washington, D.C. Dulles Intl Airport?

To ensure you get the cheapest price possible for a flight from Boston to Washington, D.C. Dulles Intl Airport, you should look to book at least 67 days in advance of your intended travel date. The price of your flight may increase if you delay and leave booking until a week or so before departure.

What is the cheapest month to book a flight from Boston to Washington, D.C. Dulles Intl Airport?

Currently, December is the cheapest month in which you can book a flight from Boston to Washington, D.C. Dulles Intl Airport (average of £183). Flying from Boston to Washington, D.C. Dulles Intl Airport in June is currently the most expensive (average of £250). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from BOS to IAD?

Find hourly flight availability from Boston to Dulles Intl. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 24 April 2026.

When flying from Boston to Washington, D.C. Dulles Intl Airport, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

How much does it cost for a return flight from Boston to Washington, D.C. Dulles Intl Airport?

Related info for your journey

Find useful and relevant information for your journey from Boston to Dulles Intl. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly from for flights from Boston to Washington, D.C. Dulles Intl?

    Boston Logan Intl (BOS) is the airport you will fly out of if you book a flight from Boston to Washington, D.C. Dulles Intl. You should not have trouble finding flights to Washington, D.C. Dulles Intl from Logan Intl; the airport handles an average of 16 outbound flights to Washington, D.C. Dulles Intl per day. You should also have plenty of airline options to choose from since 0 airlines have flights from the Boston airport to Washington, D.C. Dulles Intl. It is only a 2.6 mi journey to Logan Intl (BOS) from Boston’s city center.

  • How long is the flight from Boston to Washington, D.C. Dulles Intl Airport?

    There are many flights that can get you from Boston to Washington, D.C. Dulles Intl Airport in 5h 32m. Fly via United Airlines to get the fastest option. There are 411 mi between Boston and Washington, D.C. Dulles Intl Airport.

  • What are the most reliable airlines from Boston to Washington, D.C. Dulles Intl Airport?

    The top 3 most reliable airlines when flying from Boston to Washington, D.C. Dulles Intl Airport are Ethiopian Air (91%), Egyptair (91%) and ANA (89%).

  • Can I find deals for flights from Boston to Dulles Intl that include hotel bookings?

    Yes. In addition to deals on Boston to Dulles Intl flights, Cheapflights offers holiday packages that include both flights and hotel.

  • How can I find direct flights from Boston to Dulles Intl?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Boston to Dulles Intl.

  • Can I find deals for business class flights from Boston to Dulles Intl?

    Yes. Cheapflights offers flight deals from Boston to Dulles Intl by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from Boston to Washington, D.C. Dulles Intl Airport?

    Currently, December is the cheapest month in which you can book a flight from Boston to Washington, D.C. Dulles Intl Airport (average of £183). Flying from Boston to Washington, D.C. Dulles Intl Airport in June is currently the most expensive (average of £250). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Travelling to a place near Washington, D.C. Dulles Intl Airport?

Book flights to Washington, D.C. Dulles Intl Airport if you plan to visit one of these locations
Silver Spring
Hanover
Oxon Hill
Gaithersburg
Woodbridge
Arlington
Alexandria
Sterling

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Alternative routes for Boston to Dulles Intl

See prices for flight routes from nearby airports that may be better suited for you.
Boston to Reagan-National flights

Fly with Cheapflights

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How does Cheapflights help users find flights from Boston to Dulles Intl?

Cheapflights goes through 900+ travel sites to look for the best flight deals for flights from Boston to Dulles Intl. Too many options? Cheapflights also provides filters for things like airlines, price ranges, and number of stops to help you make a decision easily.

Why should you use Cheapflights to find cheap flight tickets from Boston to Dulles Intl?

Cheapflights helps you find that perfect flight to Dulles Intl from Boston by searching from hundreds of airlines and agencies you know and love. We are also free to use, in case you were wondering!

Can Cheapflights find flights from Boston to Dulles Intl with no change fees?

Yes, we can. To see specific flights from Boston to Dulles Intl with no change fees, users can toggle flexible booking options after using the search form above to find flights.

Can Cheapflights notify me if prices for flights from Boston to Dulles Intl become cheaper?

Yes, Cheapflights has a feature called Price Alert, which notifies users when flight prices change. Track prices for your flight to Dulles Intl from Boston today and book when prices fit your budget.

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