BOS - IAD

$74 Find Cheap Flights from Boston to Washington Dulles Airport

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Boston to Dulles Intl departing on 12/10. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult
1 adult, Economy, 0 bags

KAYAK searches hundreds of travel sites at once for deals on flights to Washington, D.C. Dulles Intl Airport

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Boston to Washington, D.C., as well as popular online travel agencies
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Boston to Washington, D.C., as well as popular online travel agencies
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Everything you should know

Cheapest round-trip
$141
Overall average: $277
United Airlines
Sun 12/7Tue 12/9
BOS - IAD • Non-stop
Cheapest non-stop
$142
Typical prices: $262-$426
United Airlines
Sun 11/23Thu 11/27
BOS - IAD • Non-stop
Our travelers' advice
AI-generated summary based on content written by travel experts
United's Economy Plus offers extra legroom on this route.
Use the FlyLogan app for a smoother Boston departure.
Expert advice
Expert advice
Expert advice
Expert advice
Video guide: How to find cheap flights to Dulles Intl
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Top airlines
United Airlines
Cheapest • from $141 (round-trip)
Delta
Best reviews • 7.9 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
When to book
3 weeks
in advance
Our data shows that travelers who book at least 3 weeks in advance save around 40% compared to booking last minute.
Insights
Insights
Insights
Insights
When to travel
January
Cheapest • 26% price drop
November
Most popular
Good to know
Good to know
+1
+1
Good to know
Good to know
+1
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We hope you love your trip to Dulles Intl!
Flight Deals
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Expert advice
Flight Deals

Cheap Flights from Boston to Dulles Intl (BOS-IAD)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Boston to Dulles Intl 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.

Recent round-trip flight deals from Boston to Dulles Intl

Sun, Dec 7 - Tue, Dec 9
United Airlines Logo
5:30 am - 7:14 amBOS-IAD
1h 44mnonstop
United Airlines Logo
5:19 pm - 9:33 pmIAD-BOS
4h 14m1 stop
$141United Airlines
Find Deal
Sun, Nov 23 - Thu, Nov 27
United Airlines Logo
5:30 am - 7:13 amBOS-IAD
1h 43mnonstop
United Airlines Logo
5:20 pm - 6:58 pmIAD-BOS
1h 38mnonstop
$142United Airlines
Find Deal
Thu, Dec 4 - Mon, Dec 8
Delta Logo
6:05 am - 11:39 amBOS-IAD
5h 34m1 stop
Delta Logo
11:06 am - 4:03 pmIAD-BOS
4h 57m1 stop
$143Delta
Find Deal
Wed, Dec 3 - Wed, Dec 10
United Airlines Logo
12:02 pm - 4:30 pmBOS-IAD
4h 28m1 stop
United Airlines Logo
10:06 pm - 11:41 pmIAD-BOS
1h 35mnonstop
$145United Airlines
Find Deal
Fri, Dec 5 - Fri, Dec 5
United Airlines Logo
5:30 am - 7:14 amBOS-IAD
1h 44mnonstop
United Airlines Logo
10:06 pm - 11:41 pmIAD-BOS
1h 35mnonstop
$147United Airlines
Find Deal
Thu, Dec 4 - Tue, Dec 9
Multiple Airlines Logo
11:28 am - 11:10 pmBOS-IAD
11h 42m1 stop
Multiple Airlines Logo
9:00 am - 11:56 pmIAD-BOS
14h 56m2 stops
$148Multiple Airlines
Find Deal
Sun, Nov 16 - Wed, Nov 19
United Airlines Logo
5:30 am - 7:13 amBOS-IAD
1h 43mnonstop
United Airlines Logo
10:07 pm - 11:42 pmIAD-BOS
1h 35mnonstop
$152United Airlines
Find Deal
Wed, Dec 3 - Sat, Dec 6
Multiple Airlines Logo
9:54 pm - 6:18 pmBOS-IAD
20h 24m1 stop
Multiple Airlines Logo
9:20 pm - 9:27 amIAD-BOS
12h 07m1 stop
$153Multiple Airlines
Find Deal
Thu, Dec 4 - Sun, Dec 7
Frontier Logo
11:28 am - 11:10 pmBOS-IAD
11h 42m1 stop
Frontier Logo
5:45 am - 7:33 amIAD-BOS
25h 48m2 stops
$161Frontier
Find Deal
Fri, Dec 5 - Sun, Dec 7
Frontier Logo
11:19 am - 8:24 pmBOS-IAD
33h 05m2 stops
Frontier Logo
5:26 pm - 10:22 amIAD-BOS
16h 56m1 stop
$165Frontier
Find Deal
Booking Insights

KAYAK's insights & trends for Boston to Dulles Intl flights

Get data-powered insights and trends into flights from Boston to Dulles Intl to help you find the cheapest flights, the best time to fly and much more.

Find cheap flights to Washington Dulles Airport
Find cheap flights to Washington Dulles Airport

Planning a trip from Boston to Dulles Intl? KAYAK’s data-powered insights will help you find cheap flights. Learn the best time to fly, how early to book your ticket, and other tips to secure great prices.

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

The average price of all round-trip flights from Boston to Washington, D.C. Dulles Intl Airport clicked on KAYAK for each day over the last 12 months.

For Boston to Washington Dulles Airport, Friday is the cheapest day to fly on average and Tuesday is the most expensive. Flying from Washington Dulles Airport back to Boston, the best deals are generally found on Wednesday, with Sunday being the most expensive.

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

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from Boston to Washington, D.C. Dulles Intl Airport, removes the top 0.1% to account for outliers, and then takes the median of all values for each month.

The cheapest month for flights from Boston to Washington, D.C. Dulles Intl Airport is January, where tickets cost $209 (return) on average. On the other hand, the most expensive months are June and October, where the average cost of round-trip tickets is $336 and $313 respectively.

Can I save money by flying with a layover from Boston to Washington, D.C. Dulles Intl Airport?

The average round-trip price for all non-stop flights, flights with one layover, and flights with two layovers for the route found by users searching on KAYAK in the last 2 weeks.

No, with an average price for the route of $237, prices are generally cheapest when you fly direct.

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

To calculate weekly average prices, KAYAK takes all prices for each week before departure over the last year for round-trip flights from Boston to Washington, D.C. Dulles Intl Airport, removes the top 0.1% to account for outliers, and then takes the average of all the values for each week.

To get a below average price on the flight from Boston to Washington, D.C. Dulles Intl Airport, you should book around 3 weeks before departure, which saves you about 40% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 20 weeks before departure.

Expert advice

Expert advice for your flight from Boston to Dulles Intl

 
Snippets provided in this section are AI-generated based on a summarization of KAYAK-commissioned articles. The articles are presented as-is, for general informational purposes only, and may not be up-to-date. The opinions contained in the articles are original to the author and reflect their authentic experience, which may vary significantly from the experience of others.
KAYAK teamed up with top travel experts to share the best tips for your journey.
Airlines
Ethiopian Air

Ethiopian Airlines offers generous baggage allowances: two pieces up to 50 pounds each in Economy.


Upgrade to Cloud Nine for priority boarding and increased baggage allowance.

Read more about Ethiopian Airby Jessica Macdonald
United Airlines

United offers Priority Boarding for Zone 2, reducing overhead bin space issues.


United's Economy Plus seats offer up to six inches more legroom than standard economy.

Airports
BOS

Consider using the FlyLogan app for gate info, flight status, and ordering ahead at airport restaurants, enhancing your departure experience from BOS.

Read more about BOSby Blane Bachelor
IAD

The Silver Line Metro now connects IAD to downtown D.C., offering a convenient 50-minute ride to the city center.

Read more about IADby Stefanie Waldek
Our travel experts
Jessica Macdonald

Jessica Macdonald

Expert on Ethiopian Air

Jessica Macdonald

Jessica Macdonald

Currently based in Scotland after living in South Africa and the United States, Jessica has been writing travel and aviation content for more than 10 years. She regularly contributes to Travel + Leisure and TripSavvy, and has had work published by Condé Nast Traveller and The Independent. She has traveled to more than 50 countries across six continents.

Read more
Stefanie Waldek

Stefanie Waldek

Expert on United Airlines and IAD

Stefanie Waldek

Stefanie Waldek

Stefanie Waldek is a freelance space, travel, and design writer based in Saratoga Springs, NY. Her words have appeared in Space.com, Travel + Leisure, Condé Nast Traveler, Architectural Digest, and House Beautiful, among other publications. An expert in aviation and expedition cruising, Stefanie is frequently up in the air or on the sea, likely en route to Antarctica or the Arctic.

Read more
Blane Bachelor

Blane Bachelor

Expert on BOS

Blane Bachelor

Blane Bachelor

Blane Bachelor is a journalist and editor specializing in travel and aviation who writes regularly for top global outlets. Born and raised in Florida, Blane has worked and lived in four countries, including the Netherlands, where she’s currently based with her family. Her favorite way to get to know a new destination is by running or riding a bike around town – or hearing a spooky ghost story about local history. She will always choose the window seat.

Read more

Good to know

Low seasonFebruary
Cheapest flight$74
Best time to beat the crowds with an average 6% drop in price.
Most popular time to fly with an average 3% increase in price.
Flight from Boston to Washington Dulles Airport

When to book flights from Boston to Dulles Intl

Are your dates flexible? Find out the best times to travel from Boston to Dulles Intl based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated round-trip price
KAYAK looks at all historical flight data for each date to provide a predicted price for one-way trips or round-trips with a duration up to 40 days. While we try to provide actual minimum prices for each date, some prices are predictions and actual prices may differ.

FAQs for booking Boston to Washington Dulles Airport flights

  • Where should I park my car if I drive to BOS?

    BOS is home to several parking garages. It is also surrounded by several off-site garages. If you want to park your car at a parking garage near this airport, you should consider parking it in one of its off-site garages. This is because off-site garages charge lower rates than on-site ones.

  • Apart from IAD, which other airports serve Washington?

    Washington is served by IAD, Ronald Reagan Washington National Airport (DCA), and Baltimore/Washington International Airport (BWI). If you don’t want to land at IAD, you should opt to land at DCA, as it is closer to Washington and its surroundings than BWI.

  • Is there an on-site hotel at IAD?

    If you would like to stay at a hotel near IAD, you can do so, as this Washington airport is home to Sleepbox Lounge. Found between Gates A6 and A14, near the AeroTrain in Concourse A, this hotel features elite amenities. This hotel’s rooms are relatively cheaper than most hotels near the airport, so staying in it would be economically wise.

  • Is it possible to rent a car at IAD?

    IAD is home to car rental agencies like Avis, Budget, Dollar, Enterprise, Hertz, and National. The counters for these car rentals are within the airport’s terminal complex. Given that all these car rentals are reliable, if you want to rent a car at IAD, you’ll have many agencies to hire from.

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

    In the last 3 days, the lowest price for a flight from Boston to Washington, D.C. Dulles Intl Airport was $74 for a one-way ticket and $141 for a round-trip.

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

    A passport is not required to fly from Boston to Washington Dulles Airport.

  • Which airlines offer Wi-Fi service onboard planes from Boston to Washington Dulles Airport?

    JetBlue, Delta, American Airlines, and Air France offer inflight Wi-Fi service on the Boston to Washington Dulles Airport flight route.

  • Which aircraft models fly most regularly from Boston to Washington Dulles Airport?

    The Boeing 737-900 is the aircraft model that flies most regularly on the Boston to Washington Dulles Airport flight route.

  • Which airline alliances offer flights from Boston to Washington Dulles Airport?

    SkyTeam, and Star Alliance are the airline alliances operating flights between Boston and Washington Dulles Airport, with SkyTeam being the most commonly used for this route.

  • On which days can I fly direct from Boston to Washington Dulles Airport?

    There are nonstop flights from Boston to Washington Dulles Airport on a daily basis.

  • Which is the best airline for flights from Boston to Washington, D.C., Delta or United Airlines?

    The two airlines most popular with KAYAK users for flights from Boston to Washington, D.C. are Delta and United Airlines. With an average price for the route of $277 and an overall rating of 7.9, Delta is the most popular choice. United Airlines is also a great choice for the route, with an average price of $281 and an overall rating of 7.4.

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

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Boston to Washington Dulles Airport.

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

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Washington Dulles Airport from Boston is likely to change within 7 days, so travelers know whether to wait or book now.

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

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to Washington Dulles Airport with an airline and back to Boston with another airline. Booking your flights between Boston and IAD can sometimes prove cheaper using this method.

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

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to Washington Dulles Airport from Boston up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

KAYAK’s top tips for finding a cheap flight from Boston to Washington, D.C. Dulles Intl Airport

  • Looking for a cheap flight? 25% of our users found flights on this route for $146 or less one-way and $243 or less round-trip.
  • Boston Logan International Airport (BOS) is one of the most used airports globally. As a result, you’ll likely encounter slow-moving traffic and long lines at its security checkpoints when entering this airport. To have enough time to navigate the traffic and be cleared at the checkpoints, you should reach this airport no less than 2h before your flight on the date you're set to fly from it.
  • If you are journeying from BOS to Dulles International Airport (IAD) with your kids, you should let them have fun in one of BOS’s children’s play areas. These playgrounds are near Gate 18 in Terminal A, Gate 30 in Terminal B, and Gate 25 in Terminal C. It’s worth stating that in any, your kids will have a good time, as they all feature several toys and child-proof playgrounds.
  • In case you’re traveling to Washington with your pet while waiting for your flight at BOS, you can let it relieve itself in one of the airport’s designated pet relief areas. The relief areas at this airport are on the Arrival level curb of every terminal and across Gate E7 in Terminal E.
  • If you’re in no rush to depart IAD, you should consider visiting Be Relax Spa. This spa, located near Gate A32, has dedicated staff and proper spa equipment. As it offers its services at pocket-friendly rates, you will enjoy quality service without incurring a hefty bill here.
  • You can pray, meditate, or reflect privately at IAD, as the airport features a chapel. This interfaith chapel, near Gate A32 on Concourse A, is normally open 24/7.

Prefer to fly direct from Boston to Washington Dulles Airport?

 
Direct data is based off flight results for the next 60 days. Find direct flights from all airlines flying direct from Boston Logan Intl to Washington, D.C. Dulles Intl.
Find which airlines fly direct from Boston Logan Intl Airport to Washington, D.C. Dulles Intl Airport, which days they fly and book direct flights.

Direct departures

Boston Logan Intl to Washington, D.C. Dulles Intl

Monday

United Airlines

United Airlines

Tuesday

United Airlines

United Airlines

Wednesday

United Airlines

United Airlines

Thursday

United Airlines

United Airlines

Friday

United Airlines

United Airlines

Saturday

United Airlines

United Airlines

Sunday

United Airlines

United Airlines

See more direct flights

Direct returns

Washington, D.C. Dulles Intl to Boston Logan Intl

Monday

United Airlines

United Airlines

Tuesday

United Airlines

United Airlines

Wednesday

United Airlines

United Airlines

Thursday

United Airlines

United Airlines

Friday

United Airlines

United Airlines

Saturday

United Airlines

United Airlines

Sunday

United Airlines

United Airlines

See more direct flights

Reviews of the top 4 airlines serving from Boston to Dulles Intl

 
See real verified KAYAK customer reviews for airlines flying from Boston to Washington, D.C.. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with from Boston to Dulles Intl? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
7.9
DeltaOverall score based on 8004 reviews
7.9Entertainment
7.3Food
7.9Comfort
8.5Crew
8.2Boarding
Airline reviews

I truly love flying with Delta. They have always treated me with the upmost respect

10.0 ExcellentMAYRA, Nov 2025JFK - MIA
Read more Delta reviews

I truly love flying with Delta. They have always treated me with the upmost respect

Our flight attendant in FIRST CLASS was one of the worst I’ve ever had. She was not at all pleasant, nor particularly good at her service.

Everything went well and was good. Nothing exceptional, but no complaints either. Cheap seats are pretty comfortable.

Staff were friendly and happy. Delta could make sure passengers that don't have the app know of changes. Without Kayak I would not have known about the change of gate or the delay. Kayak was faster to notify me.

They ended up paying for the bag twice, but the counter wouldn't take my baggage receipt. Left it to me to resolve. Not sure how to resolve the issue.

The customer service before board was very rude and when I expressed my concerns about making the connecting flight she laughed and told me I bought the wrong ticket. I explained once it showed the flight was delayed it no longer let me change seats or anything. I was trying to upgrade to make sure I would get to the next gate on time.

Non stop on long haul is the way to go. Great experience

The flight used a B767 with a very old interior from before 2014. The entertainment system did not work at all during the flight despite attempts to reset the system. It was like they flew this route just to be competitive.

They changed planes and the new plane couldn’t carry enough fuel to fly across the country so we had to stop in Kansas City to refuel. Flight was delayed .

Flight was too crowded and seats are too small, especially since passengrs are getting larger. Having a middle seat is ALWAYS tough! Woman on my left was large & kept creeping in to my space. Flight personnel were great! Have more savory rather than sweet snacks please.

Crew was dismissive. Snacks and refills not offered. Poor business class experience. Bed not comfortable compared to Emirates or BA.

Flight was delayed for 5 hours because crew didn’t have enough time to rest - this seems like it could have been avoided with better scheduling. Food was not good.

IAD with the archaic people movers is just a place to be avoided.

Overall, it was good. I was seating next to a wonderful lady and did not notice how time flew. Thanks

This is the best united airlines flight that I took. The crew was very friendly and the food was tasty!

It is clear that someone knew, and competent, is in charge of food at United Airlines at least for the international flights. I was flying in coach, but the choices of the dinner were excellent. Tasty, and appropriate size. I had the beef, which was a little bit like a shepherds pie, and it was good. Nothing comparable has been served on a United flight in years. It will not be confused with three star food, but it is very good for airline food. Even better was the breakfast choice between a cinnamon roll and a breakfast sandwich. I chose the breakfast sandwich which was absolutely delicious and which I would happily order again at my local Starbucks or Panera. It is clear that someone knew indifferent is in charge of the food and it’s about time.

Had one staff that was not pleasant. Seems they are stressed with too many people to care for.

I would have liked an opportunity to move to a different seat ( even would have checked in my hand luggage)as I had health issues where I didn't have to clamber over the passenger next to me to for toilet use/ movement [ She was a highly unpleasant neighbor to sit next to]. In addition, I found that my European phone plan had run out of data and so I was not receiving emails from yourselves on airport wifi to be able to check in online and verifications difficult as did not accept the ticket number I had. I asked for an extra blanket but was told there was none. Then I saw other passengers receiving them. I couldn't eat the food and asked for snacks : Stewardess said " on the way" but they did not bring. The best bit was the check in process in Lisbon. Very efficient. However, I did not understand why we had to collect our bags at Washington then go through customs again. It was not explained. I also with my leg and health issue had approximately mile walk to the gate ( which then changed) . There appeared to be no moving walkways or help provided.

The attendant were friendly. I suggest you have a medical attendant on board every flight so that in case someone is sick , he/she will help them.

We had a very long diversion and our food voucher didn’t work because the restaurants were closed

Checking In on JetBlue site was impossible. It hung up on REAL ID. Even my Global Entry did not help. Luckily, on Kayak site it was a breeze. Entire flight the temperature was COLD! Otherwise the crew was great!

The flight was two hours late due to a computer fault and resulting maintenance. Nothing was offered as compensation beyond bottles of water during the time we were deplaned and waiting in the terminal.

Very pleasant flight attendants. Gate crew rather loud chatting with each other.

Four plus hour flight delay in New York caused us to take off after 11:30pm. We didn’t arrive at our hotel until five hours after check in. Started the trip off feeling exhausted.

Plane was in bad shape. TV’s and WiFi didn’t work. Plane need a refresh. Not enough room for bags.

Everything was great. I liked the text updates so that I never miss a gate change & I have all the latest info.

I don’t usually fly budget airlines or airlines in the United States. It was as good as any other airline. The seats are comfortable and the airline attendants are not rude & surly. Very nice flight (s).

They have the most inexperienced / rude flight staff I’ve encountered

very difficult boarding process - aggressive passengers not the friendliest crew

WiFi was not eorkig (again) And the plane was from 1990 with the screens which were.not touch and most didn’t even work and if lucky could tune in tv

The Hawaiian lady that boarded me was rude and the one help me a the ticket counter was rude

My experience was terrible. They cancelled my flight twice. They kept delaying it and leading me on, acting like the flight was going to go when it never had a chance. I missed out on valuable family time because of spirit and I won’t be flying with them again.

Prices for bags are extremely expensive and if you go higher on weight, the charge is ridiculous.

The flight was cancelled at the last minute. Will never fly Spirit again. Without a doubt the worst airline around.

My flight was delayed several times and eventually cancelled. Then the re-booked flight for 8pm was delayed multiple times over, and eventually it would have forced me to be at the airport for 9 hours. I accepted a rebook for the following day, fortunately I was able to stay with my friend again in New York, but if I didn’t have him as a resource it would have been much more upsetting.

Horrible, delay after delay due to our plane needing fuel.

Rough landings but comfortable and affordable if you can pack light

the plane was not full so the flight attendant had me move to an empty row which made for a good flight. The software for logging on and booking and confirming the flight is much too cumbersome.

Always comes in handy when I want a quick weekend getaway.

For the price I could have taken a “name brand” airline. No drink no snack and constant emails trying to get addition money for EVERYTHING other airlines include in the price. It looks cheaper but it’s Judy bait and switch and emails non stop!

Everything you need to know for your flight from Boston to Dulles Intl

Information on your arrival and departure airports