Cheap flights from Washington Dulles to Belfast

Compare Washington Dulles to Belfast flight deals

Find the cheapest month or even day of the year to fly to Belfast

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Flight deals from Washington Dulles to Belfast

Looking for a cheap last-minute deal or the best round-trip flight from Washington Dulles Airport to Belfast? If you want to travel next month, round-trip fares start from $924. Find the lowest prices on one-way and round-trip tickets right here.

Belfast.$667 per passenger.Departing Mon, Aug 10, returning Mon, Aug 17.Round-trip flight with Breeze Airways and Ryanair.Outbound indirect flight with Breeze Airways, departing from Washington Dulles on Mon, Aug 10, arriving in Belfast International.Inbound indirect flight with Ryanair, departing from Belfast International on Mon, Aug 17, arriving in Washington Dulles.Price includes taxes and charges.From $667, select.

Belfast.$711 per passenger.Departing Fri, Sep 4, returning Tue, Sep 8.Round-trip flight with Icelandair and Ryanair.Outbound indirect flight with Icelandair, departing from Washington Dulles on Fri, Sep 4, arriving in Belfast International.Inbound indirect flight with Ryanair, departing from Belfast International on Tue, Sep 8, arriving in Washington Dulles.Price includes taxes and charges.From $711, select.

Belfast.$769 per passenger.Departing Fri, Oct 9, returning Sun, Oct 18.Round-trip flight with Icelandair and Ryanair.Outbound indirect flight with Icelandair, departing from Washington Dulles on Fri, Oct 9, arriving in Belfast International.Inbound indirect flight with Ryanair, departing from Belfast International on Sun, Oct 18, arriving in Washington Dulles.Price includes taxes and charges.From $769, select.

Belfast.$832 per passenger.Departing Wed, Jul 29, returning Tue, Aug 4.Round-trip flight with Frontier Airlines and easyJet.Outbound indirect flight with Frontier Airlines, departing from Washington Dulles on Wed, Jul 29, arriving in Belfast International.Inbound indirect flight with easyJet, departing from Belfast International on Tue, Aug 4, arriving in Washington Dulles.Price includes taxes and charges.From $832, select.

Belfast.$924 per passenger.Departing Wed, Jul 22, returning Tue, Jul 28.Round-trip flight with Icelandair and Ryanair.Outbound indirect flight with Icelandair, departing from Washington Dulles on Wed, Jul 22, arriving in Belfast International.Inbound indirect flight with Ryanair, departing from Belfast International on Tue, Jul 28, arriving in Washington Dulles.Price includes taxes and charges.From $924, select.

Belfast.$1,013 per passenger.Departing Tue, Dec 15, returning Fri, Dec 18.Round-trip flight with British Airways.Outbound indirect flight with British Airways, departing from Washington Dulles on Tue, Dec 15, arriving in Belfast City.Inbound indirect flight with British Airways, departing from Belfast City on Fri, Dec 18, arriving in Washington Dulles.Price includes taxes and charges.From $1,013, select.

Find the cheapest month to fly from Washington Dulles to Belfast

We’re always keeping an eye on fares, so you can find the best one in seconds. It looks like Washington Dulles to Belfast flights are currently cheapest in August.

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Alternative Washington Dulles to Belfast routes

Looking for the cheapest, fastest or easiest route from Washington Dulles to Belfast? You could fly into the following airports instead.

Belfast City

4km from central Belfast

Closest

from $802

Search flights

Belfast International

20km from central Belfast

Cheapest

from $667

Search flights

Washington, D.C. to Belfast: Flight information

The things to know before you go.

Cheapest flight found	$667
Cheapest month to fly	August

Finding cheap flights from Washington Dulles to Belfast: Frequently asked questions

How many airports are there in Belfast?

There are 2 airports in Belfast: Belfast City and Belfast International.

How much are round-trip flights from Washington Dulles to Belfast?

The best price we found for a round-trip flight from Washington Dulles to Belfast is $667. This is an estimate based on information collected from different airlines and travel providers over the last 4 days and is subject to change and availability.

Which airlines fly direct from Washington Dulles to Belfast?

Currently, there are no airlines that fly direct from Washington Dulles to Belfast. But we found flights with one or more stops from $667.

How many flights are there a week from Washington Dulles to Belfast?

There are no flights flying from Washington Dulles to Belfast, as of June 2026.

When is the cheapest time to fly from Washington Dulles to Belfast?

The cheapest month to fly from Washington Dulles to Belfast is usually August.

What's the cheapest airport to fly to in Belfast?

If you're flying from Washington Dulles Airport, the cheapest airport near Belfast is Belfast International – which is 19.7 km away from the center of Belfast. We've found flights to this airport from $667.

Which upcoming date is cheapest to fly from Washington Dulles Airport to Belfast on?

After crunching the numbers on our flight calendar, we found that it's currently cheapest to fly from Washington Dulles Airport to Belfast on Monday, August 10, 2026.

Can I get a direct flight from Washington Dulles Airport to Belfast?

No airlines currently offer direct flights between Washington Dulles Airport and Belfast. Most routes have one or more stops.

How can I get the best flight deal from Washington Dulles Airport to Belfast?

We show every price from over 1,200 airlines and travel agents, comparing them all so you don’t have to. If you know you want to fly to Belfast but you’re not ready to book, set up a Price Alert. We’ll track prices for you, and let you know when they rise or fall.

When is the best time to book flights to Belfast?

We crunched all the numbers in our flight calendar, and it looks like the cheapest time to book a flight to Belfast is around 40 days in advance, so don’t leave your flight to the last minute.

What’s the weather like in Belfast?

In June, the average temperature is usually around 12°C. August is typically the warmest month in Belfast, when it usually averages around 17°C. You can expect the least rain in May. The coldest month is January, with temperatures averaging 4°C. The rainiest month is October.

Which is the cheapest airline to fly with from Washington Dulles Airport to Belfast?

Currently, Breeze Airways offers the cheapest flight tickets to Belfast.

Flying from Washington Dulles International Airport (IAD) to Belfast: what you need to know

Washington Dulles International Airport is located in Washington DC. Following the UTC+0 timezone, Belfast is five hours ahead of Washington DC.
To avoid rushing for your IAD to Belfast flight, leave enough time to check in and find your gate. Arriving two hours before international departures and one hour before domestic flights is the standard rule.
During popular months like June, you'll want to get to the airport even earlier. Plan to arrive two hours before domestic departures and four hours ahead for an international flight whenever you're flying during peak periods in general.
A stopover is the ideal opportunity to take a break from traveling and maybe even visit a new city. When searching for plane tickets from IAD to Belfast, deselect the 'Direct flights only' box to see where you can visit along the way. Top options include:
- London Heathrow Airport (LHR)
- Amsterdam Schiphol Airport (AMS)
- Frankfurt Airport (FRA)
Located around 40 kilometers from the center of Washington DC, IAD can be reached in about 45 minutes by car, depending on traffic. The journey on public transport will take roughly 1 hour 10 minutes.
Want a relaxed start to your travels? Stay near IAD. Whether you're catching an early flight from Washington Dulles International Airport to Belfast or want to avoid feeling rushed, these hotels are just the thing:
Of all flights departing from Washington Dulles International Airport, 77% arrive on time at their destination.
IAD is located at 1 Saarinen Circle.

How to find the cheapest flights from Washington Dulles International Airport (IAD) to Belfast

$310 is currently the best price for a one-way Washington Dulles International Airport to Belfast flight. Return plane tickets start at $667. These prices may change depending on availability and demand.
To pick up cheap flights from IAD to Belfast, book early. Airlines usually offer the most competitive fares when flights first go on sale.
If you have flexibility with your trip dates, take advantage of the 'Whole month' search tool. It'll find the cheapest price across each month when searching for a Washington Dulles International Airport to Belfast ticket.
You don't need to check every day to find out if fares have dropped when you create a Price Alert. We'll let you know when there's an even better deal on cheap flights from IAD to Belfast.
Save money on your flight from Washington Dulles International Airport to Belfast with the help of our filters. Choose your ideal duration, number of stops and airlines, then sort the results by 'Cheapest' for the best deals.

Airports in Belfast

Belfast International Airport (BFS)

Belfast International Airport (BFS) to the center of Belfast takes around 25 minutes to reach by car. The center is roughly 19 kilometers away.
Traveling to the center by public transport takes around 45 minutes.
The last thing you want is a long journey to your hotel if you're getting in late on a flight from Washington Dulles International Airport to Belfast. Book one of these accommodation options near BFS instead:
Booking your ride from Belfast International Airport around three weeks before your flight from IAD to Belfast can help you secure the lowest rate.

George Best Belfast City Airport (BHD)

The center of Belfast is located around 5 kilometers from George Best Belfast City Airport (BHD). After your flight from Washington Dulles International Airport to Belfast has touched down and you've made your way out of the airport, expect a drive of around 15 minutes.
Traveling by public transport will take about 25 minutes.
Following your IAD to Belfast flight, kick back at a hotel close to BHD. These are some comfortable options that'll help you slip into relaxation mode:
Snap up the best price by reserving your ride from BHD two weeks in advance. You can also expect to have a wider range of vehicles.

Best time to go to Belfast

January is the quietest month for flights from Washington Dulles International Airport to Belfast, while September is the busiest. Choose the best time to go to Belfast based on whether you want a bustling atmosphere or a more laid-back vibe.
Lock in a Washington Dulles International Airport to Belfast plane ticket with a departure in July if you want to visit the city during its warmest month. Expect temperatures to range from 9ºC (48ºF) to 19ºC (66ºF).
If you'd rather travel in cooler conditions, search for a cheap ticket from IAD to Belfast in January when temperatures average between 1ºC (34ºF) and 8ºC (46ºF).

More about Belfast

When it comes to searching for somewhere to rest your head, you'll find the most popular stays in Belfast right here. Browse these options after you've booked your flight from Washington Dulles International Airport to Belfast:
All great vacations should include some sightseeing. Titanic People, Titanic Shipyard and Titanic Belfast are must-visits when exploring Belfast.

Explore more of the United Kingdom

You've visited Belfast, now it's time to discover other corners of the United Kingdom. Journey around 274 kilometers southeast to Manchester to check off its must-visit sights. From Manchester United Museum & Stadium Tour to The Homes of Football and Museum of Science and Industry, your itinerary will be busy.
Around 354 kilometers southeast of Belfast, Birmingham is another essential stop in the United Kingdom. Experience the best of this destination with a visit to Birmingham Museum & Art Gallery, Birmingham Hippodrome Theatre and Bournville Experience.