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Cheap flights from Washington, D.C. Dulles Intl Airport to Belfast from $645

This is the cheapest round-trip flight price found by a momondo user in the last 72 hours by searching for a flight from Washington, D.C. Dulles Intl Airport to Belfast departing on 10/13. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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0 bags

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Find the cheapest flights from Washington, D.C. Dulles Intl Airport to Belfast

Cheap round-trip flights

Multiple Airlines Logo
5:45 pm - 11:45 pmIAD-BFS
25h 00m3 stops
Multiple Airlines Logo
9:00 pm - 3:20 pmBFS-IAD
47h 20m3 stops
$645Multiple Airlines
Find Deal
Mon, Oct 13 - Mon, Oct 20
Multiple Airlines Logo
10:20 pm - 11:00 pmIAD-BFS
19h 40m2 stops
Multiple Airlines Logo
9:00 pm - 3:20 pmBFS-IAD
47h 20m3 stops
$696Multiple Airlines
Find Deal
Mon, Oct 13 - Mon, Oct 20
Multiple Airlines Logo
10:00 pm - 10:00 pmIAD-BFS
20h 00m2 stops
Multiple Airlines Logo
8:05 am - 7:30 pmBFS-IAD
16h 25m2 stops
$713Multiple Airlines
Find Deal
Fri, Oct 31 - Fri, Nov 7
Multiple Airlines Logo
8:40 pm - 8:40 pmIAD-BFS
20h 00m2 stops
Multiple Airlines Logo
7:20 am - 6:30 pmBFS-IAD
16h 10m2 stops
$747Multiple Airlines
Find Deal
Wed, Oct 29 - Wed, Nov 5
Multiple Airlines Logo
6:30 pm - 5:35 pmIAD-BFS
19h 05m3 stops
Multiple Airlines Logo
8:15 am - 9:00 pmBFS-IAD
41h 45m3 stops
$769Multiple Airlines
Find Deal
Thu, Oct 30 - Thu, Nov 6
Multiple Airlines Logo
8:40 pm - 10:20 pmIAD-BFS
21h 40m2 stops
Multiple Airlines Logo
6:30 am - 6:30 pmBFS-IAD
17h 00m2 stops
$771Multiple Airlines
Find Deal
Thu, Oct 30 - Thu, Nov 6
Multiple Airlines Logo
9:45 am - 4:10 pmIAD-BFS
26h 25m3 stops
Multiple Airlines Logo
12:20 pm - 3:15 pmBFS-IAD
31h 55m3 stops
$809Multiple Airlines
Find Deal
Wed, Oct 29 - Wed, Nov 5
Multiple Airlines Logo
11:30 pm - 7:35 pmIAD-BFS
16h 05m2 stops
Multiple Airlines Logo
7:55 am - 3:15 pmBFS-IAD
36h 20m3 stops
$811Multiple Airlines
Find Deal
Wed, Oct 29 - Wed, Nov 5
Multiple Airlines Logo
6:30 pm - 10:20 pmIAD-BFS
23h 50m2 stops
Multiple Airlines Logo
8:15 am - 9:00 pmBFS-IAD
41h 45m3 stops
$834Multiple Airlines
Find Deal
Thu, Oct 30 - Thu, Nov 6
Multiple Airlines Logo
9:30 pm - 10:00 pmIAD-BFS
20h 30m2 stops
Multiple Airlines Logo
8:05 am - 3:15 pmBFS-IAD
36h 10m3 stops
$869Multiple Airlines
Find Deal
Fri, Oct 31 - Fri, Nov 7

momondo Fare Finder

 
Customize your flight search to find flights from Washington, D.C. Dulles Intl Airport to Belfast Intl Airport 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, momondo users made 832,500 searches. Data last updated September 16, 2025.
Use the filters below to find and compare flights from Washington, D.C. Dulles Intl Airport to Belfast Intl Airport that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Washington, D.C.Belfast

IAD - BFS

IADBFS

Washington, D.C. Dulles Intl

Mon 10/13

5:45 pm-11:45 pm

3 stops25h 00m

Belfast Intl

Mon 10/20

9:00 pm-3:20 pm

3 stops47h 20m

$645

Washington, D.C.Belfast

IAD - BFS

IADBFS

Washington, D.C. Dulles Intl

Mon 10/13

10:20 pm-11:00 pm

2 stops19h 40m

Belfast Intl

Mon 10/20

9:00 pm-3:20 pm

3 stops47h 20m

$696

Washington, D.C.Belfast

IAD - BFS

IADBFS

Washington, D.C. Dulles Intl

Fri 10/31

10:00 pm-10:00 pm

2 stops20h 00m

Belfast Intl

Fri 11/7

8:05 am-7:30 pm

2 stops16h 25m

$713

Washington, D.C.Belfast

IAD - BFS

IADBFS

Washington, D.C. Dulles Intl

Wed 10/29

8:40 pm-8:40 pm

2 stops20h 00m

Belfast Intl

Wed 11/5

7:20 am-6:30 pm

2 stops16h 10m

$747

Washington, D.C.Belfast

IAD - BFS

IADBFS

Washington, D.C. Dulles Intl

Thu 10/30

6:30 pm-5:35 pm

3 stops19h 05m

Belfast Intl

Thu 11/6

8:15 am-9:00 pm

3 stops41h 45m

$769

Washington, D.C.Belfast

IAD - BFS

IADBFS

Washington, D.C. Dulles Intl

Thu 10/30

8:40 pm-10:20 pm

2 stops21h 40m

Belfast Intl

Thu 11/6

6:30 am-6:30 pm

2 stops17h 00m

$771

Washington, D.C.Belfast

IAD - BFS

IADBFS

Washington, D.C. Dulles Intl

Wed 10/29

9:45 am-4:10 pm

3 stops26h 25m

Belfast Intl

Wed 11/5

12:20 pm-3:15 pm

3 stops31h 55m

$809

Washington, D.C.Belfast

IAD - BFS

IADBFS

Washington, D.C. Dulles Intl

Wed 10/29

11:30 pm-7:35 pm

2 stops16h 05m

Belfast Intl

Wed 11/5

7:55 am-3:15 pm

3 stops36h 20m

$811

Washington, D.C.Belfast

IAD - BFS

IADBFS

Washington, D.C. Dulles Intl

Thu 10/30

6:30 pm-10:20 pm

2 stops23h 50m

Belfast Intl

Thu 11/6

8:15 am-9:00 pm

3 stops41h 45m

$834

Washington, D.C.Belfast

IAD - BFS

IADBFS

Washington, D.C. Dulles Intl

Fri 10/31

9:30 pm-10:00 pm

2 stops20h 30m

Belfast Intl

Fri 11/7

8:05 am-3:15 pm

3 stops36h 10m

$869

Flights are sorted by cheapest round-trip flights first.

Sorted by cheapest first

See travel insights to Belfast from

How to get the cheapest flight ticket from Washington, D.C. Dulles Intl Airport to Belfast Intl Airport

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the cheapest day to depart on your flight to Belfast Intl Airport?

The cheapest day to depart on your flight to Belfast Intl Airport is on a Tuesday when prices can be found for as low as $680. This is often the case because there is less demand to fly during this day of the week. When flying out on a Friday, the most expensive travel day of the week, you can expect to see flight prices from Washington, D.C. Dulles Intl Airport to Belfast Intl Airport for around $884.

What is the cheapest time of day to depart on your flight to Belfast Intl Airport?

In the evening is the cheapest time of day to fly from Washington, D.C. Dulles Intl Airport to Belfast Intl Airport when you can find flight prices for as low as $683. Flying to Belfast Intl Airport in the evening is an ideal time because this is during off-peak travel hours. In contrast, the most expensive time of day to depart to Belfast Intl Airport is in the afternoon when prices are around $762.

When to book flights from Washington, D.C. Dulles Intl Airport to Belfast Intl Airport

Are you open to changing your travel dates? Check out the ideal times to fly from Washington, D.C. Dulles Intl Airport to Belfast Intl Airport according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

Cheap Washington, D.C. Dulles Intl Airport to Belfast Intl Airport (IAD to BFS) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Washington, D.C. Dulles Intl Airport to Belfast Intl Airport

Direct flights

None
There are no direct flights from Washington, D.C. Dulles Intl Airport to Belfast Intl Airport. There are no popular flight routes from Washington, D.C. Dulles Intl Airport to Belfast Intl Airport.
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  • How far is Washington, D.C. Dulles Intl to Belfast Intl by plane?

    Belfast Intl is 3375.6 mi away from Washington, D.C. Dulles Intl. By plane, this route typically takes 15h 50m.

  • When did momondo last update prices for flights from Washington, D.C. Dulles Intl Airport to Belfast Intl Airport?

    Prices for flights from Washington, D.C. Dulles Intl Airport to Belfast Intl Airport are refreshed on a daily basis.

  • How many operators does momondo search for flights from Washington, D.C. Dulles Intl Airport to Belfast Intl Airport?

  • How old do you have to be to fly from Washington, D.C. Dulles Intl Airport to Belfast Intl Airport?

    The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from Washington, D.C. Dulles Intl Airport to Belfast Intl Airport.

  • What documentation or ID do you need to fly to Belfast Intl Airport?

    The travel and health documents you'll need for your trip to Belfast Intl Airport may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at Belfast Intl Airport. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

  • What is the most popular airline from Washington, D.C. Dulles Intl Airport to Belfast Intl Airport?

Best airlines flying from Washington, D.C. Dulles Intl Airport to Belfast Intl Airport

Compare and see reviews for airlines that fly from Washington, D.C. Dulles Intl Airport to Belfast Intl Airport with momondo
Airline
Rating
Free Cancellation
Price
British AirwaysPriceFrom $627Free CancellationRating
6.7
7,363 reviews
Search British Airways flights

Traveling to a place near Belfast?

Book flights to Belfast if you plan to visit one of these locations
Newry
Armagh
Cookstown
Dungannon

Why use momondo?

Why should I use momondo to find a flight deal from Washington, D.C. to Belfast?

To find the flight that best suits your needs, momondo gathers a range of flights from a large pool of different airlines and agents; you can then use our insights and filters to find and book the right flight to Belfast from Washington, D.C..

Can I find flights from Washington, D.C. to Belfast with flexible booking policies on momondo?

Flights from Washington, D.C. to Belfast with flexible booking policies can be found by using the search form above and then selecting our dedicated flexible booking filter, which will highlight only the flights where this policy is applied.

How can momondo help me find flights from Washington, D.C. to Belfast?

Once you have performed a search in the form on the page, momondo provides useful filters and insights. We can show you the cheapest days and times to fly as well as help filter your options to help you make an informed choice when booking flights to Belfast from Washington, D.C..

I’m not ready to book a flight from Washington, D.C. to Belfast right now. Can momondo alert me if prices change?

Of course. momondo tracks the price of Washington, D.C. to Belfast flights. All you need is a valid email address and we will do the rest; it is that quick and easy.

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