HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Belfast

$299+ Cheap flights from Dulles Intl (IAD) to Belfast

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 10/17. Fares are subject to change and may not be available on all flights or dates of travel.
IAD — BHD
Oct 11 — Oct 181
Sat 10/11
Sat 10/18
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Dulles Intl to Belfast with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

Cheap flight deals from Dulles Intl to Belfast

Discover tips and strategies to find the most affordable flight options for your journey from Dulles Intl (IAD) to Belfast (BF1). 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 September 11, 2025.

Round-trip from

$665
(Ticket)

One-way from

$299
(Kiwi.com)

Popular in

June

Cheapest in

February

Average price

$633
From Washington, D.C. Dulles Intl to Belfast
Search Deals
One-way flight from Washington, D.C. Dulles Intl to Belfast
Search Deals
Highest demand for flights based on searches. 22% potential increase in price ($217 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 6% potential price decrease ($43 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in September 2025
Search Deals

Find flight deals from Dulles Intl to Belfast

Cheapest flights from Dulles Intl to Belfast
Explore the most affordable flight options available from Dulles Intl to Belfast. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 11, 2025.

This Ticket deal was found by Cheapflights users on 9/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Ticket is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/265:25 pmIAD - BHD
1 stop18h 30mVirgin Atlantic
Thu 10/95:25 pmBHD - IAD
1 stop27h 10mVirgin Atlantic
Deal found 9/11$665
This Ticket deal was found by Cheapflights users on 9/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Ticket is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/268:17 pmIAD - BHD
2 stops15h 38mKLM
Thu 10/96:30 amBHD - IAD
1 stop14h 05mKLM
Deal found 9/11$693
This Delta deal was found by Cheapflights users on 9/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/125:03 pmIAD - BHD
2 stops22h 57mDelta
Sun 11/165:20 pmBHD - IAD
1 stop27h 45mDelta
Deal found 9/10$712
This Booking.com deal was found by Cheapflights users on 9/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/1010:45 pmIAD - BHD
1 stop17h 00mBritish Airways
Tue 10/148:20 pmBHD - IAD
1 stop28h 55mBritish Airways
Deal found 9/9$734
This British Airways deal was found by Cheapflights users on 9/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure British Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/126:20 pmIAD - BHD
1 stop10h 55mBritish Airways
Sun 11/1610:40 amBHD - IAD
1 stop14h 15mBritish Airways
Deal found 9/9$747
This Mytrip deal was found by Cheapflights users on 9/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/105:00 pmIAD - BFS
2 stops25h 05mMultiple Airlines
Tue 10/147:25 amBFS - IAD
3 stops36h 55mMultiple Airlines
Deal found 9/9$792
This Delta deal was found by Cheapflights users on 9/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/105:25 pmIAD - BHD
1 stop22h 50mDelta
Tue 10/146:30 amBHD - IAD
2 stops21h 30mDelta
Deal found 9/9$793
This Mytrip deal was found by Cheapflights users on 9/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/269:45 amIAD - BFS
3 stops29h 10mMultiple Airlines
Sun 11/25:45 amBFS - IAD
3 stops38h 30mMultiple Airlines
Deal found 9/11$848
This American Airlines deal was found by Cheapflights users on 9/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/108:25 pmIAD - BHD
2 stops14h 05mAmerican Airlines
Tue 10/149:35 amBHD - IAD
2 stops14h 55mAmerican Airlines
Deal found 9/9$855
This Kiwi.com deal was found by Cheapflights users on 9/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/265:50 pmIAD - BFS
1 stop14h 40mMultiple Airlines
Thu 10/97:10 amBFS - IAD
2 stops18h 40mMultiple Airlines
Deal found 9/10$1,016
This Mytrip deal was found by Cheapflights users on 9/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/1011:15 pmIAD - BHD
3 stops33h 05mMultiple Airlines
Tue 10/146:00 pmBHD - IAD
3 stops30h 20mMultiple Airlines
Deal found 9/9$1,032

Cheapflights Fare Finder

 
Customize your flight search to find flights from Dulles Intl to Belfast 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 2,558,603 searches. Data last updated September 11, 2025.
Use the filters below to find and compare flights from Washington, D.C. Dulles Intl Airport to Belfast that are best for you.

Fly from

Dulles Intl

Fly to

Belfast

Route

Depart

Return

Price

Washington, D.C.Belfast

IAD - BHD

IADBHD

Washington, D.C. Dulles Intl

Fri 9/26

5:25 pm-4:55 pm

1 stop18h 30m

Belfast City

Thu 10/9

5:25 pm-3:35 pm

1 stop27h 10m

$665

Washington, D.C.Belfast

IAD - BHD

IADBHD

Washington, D.C. Dulles Intl

Fri 9/26

8:17 pm-4:55 pm

2 stops15h 38m

Belfast City

Thu 10/9

6:30 am-3:35 pm

1 stop14h 05m

$693

Washington, D.C.Belfast

IAD - BHD

IADBHD

Washington, D.C. Dulles Intl

Wed 11/12

6:05 pm-4:50 pm

1 stop17h 45m

Belfast City

Sun 11/16

6:30 am-4:05 pm

1 stop14h 35m

$708

Washington, D.C.Belfast

IAD - BHD

IADBHD

Washington, D.C. Dulles Intl

Wed 11/12

11:05 am-9:00 pm

2 stops28h 55m

Belfast City

Sun 11/16

6:30 am-4:05 pm

1 stop14h 35m

$712

Washington, D.C.Belfast

IAD - BHD

IADBHD

Washington, D.C. Dulles Intl

Fri 10/10

10:45 pm-8:45 pm

1 stop17h 00m

Belfast City

Tue 10/14

8:20 pm-8:15 pm

1 stop28h 55m

$734

Washington, D.C.Belfast

IAD - BHD

IADBHD

Washington, D.C. Dulles Intl

Wed 11/12

6:20 pm-10:15 am

1 stop10h 55m

Belfast City

Sun 11/16

10:40 am-7:55 pm

1 stop14h 15m

$747

Washington, D.C.Belfast

IAD - BFS

IADBFS

Washington, D.C. Dulles Intl

Sun 10/26

11:30 pm-8:10 pm

2 stops16h 40m

Belfast Intl

Sun 11/2

5:45 am-4:15 pm

3 stops38h 30m

$792

Washington, D.C.Belfast

IAD - BFS

IADBFS

Washington, D.C. Dulles Intl

Fri 10/10

5:00 pm-11:05 pm

2 stops25h 05m

Belfast Intl

Tue 10/14

7:25 am-3:20 pm

3 stops36h 55m

$792

Washington, D.C.Belfast

IAD - BFS

IADBFS

Washington, D.C. Dulles Intl

Fri 9/26

5:50 pm-1:30 pm

1 stop14h 40m

Belfast Intl

Thu 10/9

7:10 am-8:50 pm

2 stops18h 40m

$1,016

Washington, D.C.Belfast

IAD - BFS

IADBFS

Washington, D.C. Dulles Intl

Fri 10/17

10:20 pm-8:00 am

2 stops28h 40m

$299

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/10

Showing 1-10 of 12 results
1
2

Best time to book a flight from Dulles Intl to Belfast

Have a flexible travel schedule? Discover the best time to fly to Belfast from Dulles Intl with our price prediction graph.
Estimated round-trip 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 Washington, D.C. Dulles Intl Airport to Belfast
No data available for this route at this time. Please check back soon.

Reviews of airlines servicing Belfast

Get insights into the airlines that provide service to Belfast. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Belfast. Reviews last updated September 11, 2025.
Read through reviews of airlines operating flights from Washington, D.C. Dulles Intl Airport to Belfast, such as British Airways. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
British Airways
6.7
Okay
7,361 reviews

Food

6.3

Boarding

6.9

Overall

6.7

Entertainment

6.4

Crew

7.6

Comfort

6.7

Reviews

1 / 20
8.0
Excellent

Anonymous,Aug 2025

IAD - LHR

The plane had to load and unload passengers not through a jet way but out on the tarmac at Heathrow. The steps were steep. We weren't expecting to have to carry our luggage up and down stairs.
British Airways
6.7
Okay
7,361 reviews
British Airways
6.7
Okay
7,361 reviews

Food

6.3

Boarding

6.9

Overall

6.7

Entertainment

6.4

Crew

7.6

Comfort

6.7

Reviews

1 / 20
8.0
Excellent

Anonymous,Aug 2025

IAD - LHR

The plane had to load and unload passengers not through a jet way but out on the tarmac at Heathrow. The steps were steep. We weren't expecting to have to carry our luggage up and down stairs.

Related info for your journey

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

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

    For as low as $693, Virgin Atlantic can have you in Belfast from Washington, D.C. Dulles Intl Airport in 15h 38m. There are 3390 mi between Washington, D.C. Dulles Intl Airport and Belfast. Both multi-stop and nonstop flights can be found to your destination and back.

  • What is the cheapest airline to fly from Washington, D.C. Dulles Intl Airport to Belfast round-trip?

    Flying on British Airways is currently your cheapest option to Belfast, with prices starting at $620.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from Dulles Intl to Belfast 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 Washington, D.C. Dulles Intl Airport to Belfast?

    Currently, February is the cheapest month in which you can book a flight from Washington, D.C. Dulles Intl Airport to Belfast (average of $657). Flying from Washington, D.C. Dulles Intl Airport to Belfast in June is currently the most expensive (average of $1,189). 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

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Top airline flying from Dulles Intl to Belfast

Discover the top airline that operate flights from Dulles Intl to Belfast. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated September 11, 2025.
AirlineCheapestAverageFlexibilityOn-time
British AirwaysCheapest$620Average$847FlexibilityNo cancel feeOn-time70%

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.