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Cheap flights from Washington to Belfast Intl Airport from £342

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 16/3. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — BFS
5 Feb — 12 Feb1
1 adult

Cheap flight deals from Washington to Belfast Intl

Discover tips and strategies to find the most affordable flight options for your journey from Washington (USWA) to Belfast Intl (BFS). 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 31 January 2025.

Round-trip from

£518

One-way from

£342

Popular in

June

Cheapest in

October

Average price

£764
19/3-26/3
  • 19/3-26/3
  • 4 total stops
  • 38h 40m total
  • Washington to Belfast
16/3
  • 16/3
  • 3 total stops
  • 37h 25m total
  • Washington to Belfast
Highest demand for flights based on searches. 15% potential increase in price (£113 potential increase over avg. return price).
Cheapest flight prices on average. 5% potential price decrease (£33 potential savings vs. average return price).
Average for round-trip flights in January 2025

Find flight deals from Washington to Belfast Intl

Cheapest flights from Washington to Belfast Intl
Explore the most affordable flight options available from Washington to Belfast Intl. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 31 January 2025.

Wed 19/315:35SEA - BFS
2 stops21h 35mMultiple Airlines
Wed 26/307:55BFS - SEA
2 stops17h 05mMultiple Airlines
Deal found 30/1£518
Sun 16/310:10PDX - BFS
3 stops28h 30mMultiple Airlines
Sun 23/306:35BFS - PDX
2 stops23h 03mMultiple Airlines
Deal found 30/1£1,368

Find flights from Washington to Belfast Intl within your budget

Customise your flight search to find flights from Washington to Belfast Intl 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 858,174 searches. Data last updated 31 January 2025.

Fly from

Any airport

Fly to

Any airport

Route

Depart

Return

Price

SeattleBelfast

SEA - BFS

SEABFS

Seattle/Tacoma Intl

Wed 19/3

15:35-20:10

2 stops21h 35m

Belfast Intl

Wed 26/3

07:55-18:00

2 stops17h 05m

£518

PortlandBelfast

PDX - BFS

PDXBFS

Portland

Sun 16/3

10:10-21:40

3 stops28h 30m

Belfast Intl

Sun 23/3

06:35-22:38

2 stops23h 03m

£1,368

SeattleBelfast

SEA - BFS

SEABFS

Seattle/Tacoma Intl

Sun 16/3

15:15-11:40

3 stops37h 25m

£342

Flights are sorted by cheapest return flights first.

Deals found on 30/1

Best time to book a flight from Washington to Belfast Intl

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

Travel insights for flights from Washington to Belfast Intl

Get recent, data-driven insights about flights from Washington to Belfast Intl including ideal travel times, pricing trends, and more.

Rainfall in Belfast Intl by month

Plan your trip to Belfast Intl by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Belfast Intl Airport ranges from 50.0 - 90.0 inches per month. October is typically the wettest month, when rainfall can reach 90.0 mm. April is typically the driest time to visit Belfast Intl Airport when rainfall is around 50.0 mm.

Temperature in Belfast Intl by month

Plan your trip to Belfast Intl by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Belfast 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 16.0 C. Travellers hoping to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 5.0 C).

Related info for your journey

Find useful and relevant information for your journey from Washington to Belfast 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 Washington to Belfast Intl that include hotel bookings?

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

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

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

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

    Yes. Cheapflights offers flight deals from Washington to Belfast 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 State of Washington to Belfast Intl Airport?

    Currently, January is the cheapest month in which you can book a flight from State of Washington to Belfast Intl Airport (average of £67). Flying from State of Washington to Belfast Intl Airport in July is currently the most expensive (average of £90). 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

Travelling to a place near Washington?

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

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Users can book flights with no change fees policies with our dedicated filters. Book flights from Washington to Belfast Intl flexibly with Cheapflights today.

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

Yes, Cheapflights offers price alerts on Washington to Belfast Intl flights so you can book your travel at the perfect time. Price Alerts can be enabled by clicking the bell icon next to the flight deals above and providing your email address where you want to receive the alerts.

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