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

Currently, January is the cheapest month in which you can book a flight from Belfast Intl Airport to Washington, D.C. Dulles Intl Airport (average of £599). Flying from Belfast Intl Airport to Washington, D.C. Dulles Intl Airport in July is currently the most expensive (average of £947). 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 day to fly from Belfast Intl Airport to Washington, D.C. Dulles Intl Airport?

Travellers seeking maximum savings on their Belfast Intl Airport to Washington, D.C. Dulles Intl Airport flight should consider departing on Friday at midday when fares are most often at their lowest. Friday at midday flights should be avoided if possible as fares are typically the most expensive at this time.

In terms of precipitation, rainfall in Washington, D.C. Dulles Intl Airport ranges from 66.0 - 102.0 inches per month. May is typically the wettest month, when rainfall can reach 102.0 mm. February is typically the driest time to visit Washington, D.C. Dulles Intl Airport when rainfall is around 66.0 mm.

If weather is an important factor for your trip to Washington, D.C. Dulles Intl Airport, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 27.0 C. Travellers hoping to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 2.0 C).

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

When flying from Belfast Intl Airport to Washington, D.C. Dulles Intl Airport, the time of day you fly usually plays a role in the price. Save by searching for a flight at midday, which can drop the price by up to 11% versus a flight in the morning.

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

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

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

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

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

Yes. Cheapflights offers flight deals from Belfast Intl 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.

£284+ Flights from Belfast Intl Airport to Washington, D.C. Dulles Intl Airport

Cheap flight deals from Belfast Intl to Dulles Intl

Round-trip from	£578
One-way from	£284

30/10-6/11
5 total stops
57h 35m total
Belfast to Washington, D.C.

Search Deals

14/10
3 total stops
46h 55m total
Belfast to Washington, D.C.

Search Deals

Find flight deals from Belfast Intl to Dulles Intl

Cheapest flights from Belfast Intl to Dulles Intl
Explore the most affordable flight options available from Belfast Intl to Dulles Intl. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 17 September 2025.

Thu 30/1016:15BFS - IAD

3 stops33h 45mMultiple Airlines

Thu 6/1117:30IAD - BFS

2 stops23h 50mMultiple Airlines

Deal found 14/9£578

Fri 10/1006:05BFS - IAD

2 stops21h 05mMultiple Airlines

Sun 12/1020:30IAD - BFS

2 stops18h 50mMultiple Airlines

Deal found 15/9£581

Best flights from Belfast Intl to Dulles Intl
Discover carefully curated flight deals from Belfast Intl to Dulles Intl that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 17 September 2025.

Thu 30/1016:15BFS - IAD

3 stops33h 45mMultiple Airlines

Thu 6/1117:30IAD - BFS

2 stops23h 50mMultiple Airlines

Deal found 14/9£578

Fri 10/1006:05BFS - IAD

2 stops21h 05mMultiple Airlines

Sun 12/1020:30IAD - BFS

2 stops18h 50mMultiple Airlines

Deal found 15/9£581

Last-minute flights from Belfast Intl to Dulles Intl
Discover last-minute flight deals from Belfast Intl to Dulles Intl. Data last updated 17 September 2025 and is based on user searches.

Fri 10/1006:05BFS - IAD

2 stops21h 05mMultiple Airlines

Sun 12/1020:30IAD - BFS

2 stops18h 50mMultiple Airlines

Deal found 15/9£581

Thu 30/1016:15BFS - IAD

3 stops33h 45mMultiple Airlines

Thu 6/1117:30IAD - BFS

2 stops23h 50mMultiple Airlines

Deal found 14/9£578

Cheapflights Fare Finder

Use the filters below to find and compare flights from Belfast Intl Airport to Washington, D.C. Dulles Intl Airport that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

BelfastWashington, D.C.

BFS - IAD

BFSIAD

Belfast Intl

Thu 30/10

16:15-22:00

3 stops33h 45m

Washington, D.C. Dulles Intl

Thu 6/11

17:30-22:20

2 stops23h 50m

£578

BelfastWashington, D.C.

BFS - IAD

BFSIAD

Belfast Intl

Fri 10/10

06:05-22:10

2 stops21h 05m

Washington, D.C. Dulles Intl

Sun 12/10

20:30-20:20

2 stops18h 50m

£581

BelfastWashington, D.C.

BFS - IAD

BFSIAD

Belfast Intl

Tue 14/10

21:25-15:20

3 stops46h 55m

£284

Flights are sorted by cheapest return flights first.

Deals found on 14/9

Best time to book a flight from Belfast Intl to Dulles Intl

Have a flexible travel schedule? Discover the best time to fly to Dulles Intl from Belfast Intl 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.

Related info for your journey

Can I find deals for flights from Belfast Intl to Dulles Intl that include hotel bookings?
Yes. In addition to deals on Belfast Intl to Dulles Intl flights, Cheapflights offers holiday packages that include both flights and hotel.
How can I find direct flights from Belfast Intl to Dulles Intl?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Belfast Intl to Dulles Intl.
Can I find deals for business class flights from Belfast Intl to Dulles Intl?
Yes. Cheapflights offers flight deals from Belfast Intl 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 Belfast Intl Airport to Washington, D.C. Dulles Intl Airport?
Currently, January is the cheapest month in which you can book a flight from Belfast Intl Airport to Washington, D.C. Dulles Intl Airport (average of £599). Flying from Belfast Intl Airport to Washington, D.C. Dulles Intl Airport in July is currently the most expensive (average of £947). 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.

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

Cheapflights helps you find that perfect flight to Dulles Intl from Belfast Intl 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 Belfast Intl to Dulles Intl with no change fees?

Need flexible booking options for your flight to Dulles Intl from Belfast Intl? Don’t worry, Cheapflights have you covered. Use our search filter to only show flights with no change fees.

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

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Cheap flights from Belfast Intl Airport to Washington, D.C. Dulles Intl Airport from £284

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 14/10. Fares are subject to change and may not be available on all flights or dates of travel.

Cheap flight deals from Belfast Intl to Dulles Intl

Round-trip from

One-way from

Find flight deals from Belfast Intl to Dulles Intl

Cheapest flights from Belfast Intl to Dulles IntlExplore the most affordable flight options available from Belfast Intl to Dulles Intl. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 17 September 2025.

Explore the most affordable flight options available from Belfast Intl to Dulles Intl. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 17 September 2025.

Cheapflights Fare Finder

Use the filters below to find and compare flights from Belfast Intl Airport to Washington, D.C. Dulles Intl Airport that are best for you.

Best time to book a flight from Belfast Intl to Dulles Intl

Have a flexible travel schedule? Discover the best time to fly to Dulles Intl from Belfast Intl with our price prediction graph.

Related info for your journey

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

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

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

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

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

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

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Alternative routes for Belfast Intl to Dulles Intl

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

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

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

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

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Cheapest flights from Belfast Intl to Dulles Intl
Explore the most affordable flight options available from Belfast Intl to Dulles Intl. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 17 September 2025.