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Cheap flights from Seattle to Belfast from $599

This is the cheapest round-trip flight price found by a momondo user in the last 72 hours by searching for a flight from Seattle to Belfast departing on 2/1. 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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Find the cheapest flights from Seattle to Belfast

Cheap round-trip flights

Enter your travel dates to find the best prices.
British Airways Logo
6:50 pm - 4:50 pm
SEA
-
BHD
14h 00m1 stop
British Airways Logo
11:30 am - 4:55 pm
BHD
-
SEA
13h 25m1 stop
$599British Airways
Sun, Feb 1 - Mon, Feb 9
British Airways Logo
1:35 pm - 2:15 pm
SEA
-
BHD
16h 40m1 stop
British Airways Logo
12:25 pm - 5:55 pm
BHD
-
SEA
12h 30m1 stop
$603British Airways
Sat, Mar 7 - Wed, Mar 18
British Airways Logo
7:15 am - 2:15 pm
SEA
-
BHD
23h 00m2 stops
British Airways Logo
9:15 am - 5:55 pm
BHD
-
SEA
15h 40m1 stop
$619British Airways
Sat, Mar 7 - Wed, Mar 18
British Airways Logo
7:15 am - 2:15 pm
SEA
-
BHD
23h 00m2 stops
British Airways Logo
6:35 am - 9:54 pm
BHD
-
SEA
22h 19m2 stops
$622British Airways
Sat, Mar 7 - Wed, Mar 18
British Airways Logo
6:12 am - 10:20 am
SEA
-
BHD
20h 08m2 stops
British Airways Logo
6:35 am - 10:20 pm
BHD
-
SEA
23h 45m2 stops
$623British Airways
Sun, Feb 1 - Mon, Feb 9
British Airways Logo
6:50 pm - 5:15 pm
SEA
-
BHD
14h 25m1 stop
British Airways Logo
6:35 am - 11:30 am
BHD
-
SEA
12h 55m1 stop
$624British Airways
Fri, Jan 30 - Tue, Feb 3
Delta Logo
7:10 am - 4:50 pm
SEA
-
BHD
25h 40m2 stops
Delta Logo
6:30 am - 12:35 pm
BHD
-
SEA
13h 05m1 stop
$650Delta
Sat, Mar 7 - Tue, Mar 17
Delta Logo
7:10 am - 4:50 pm
SEA
-
BHD
25h 40m2 stops
Delta Logo
6:30 am - 7:04 pm
BHD
-
SEA
19h 34m2 stops
$660Delta
Sat, Mar 7 - Tue, Mar 17
British Airways Logo
8:20 pm - 4:25 pm
SEA
-
BHD
12h 05m1 stop
British Airways Logo
7:10 pm - 11:35 am
BHD
-
SEA
24h 25m1 stop
$689British Airways
Tue, Apr 14 - Sun, Apr 26
British Airways Logo
1:33 pm - 3:30 pm
SEA
-
BHD
17h 57m2 stops
British Airways Logo
9:50 am - 6:25 pm
BHD
-
SEA
16h 35m1 stop
$706British Airways
Thu, Apr 16 - Mon, Apr 27

British Airways flights from Seattle to Belfast City Airport

Our best British Airways deals on Seattle to Belfast City Airport flight tickets
British Airways
Feb 1
SEA6:50 pmSeattle/Tacoma Intl
14h 00m
1 stop
BHD4:50 pmBelfast City
Feb 9
BHD11:30 amBelfast City
13h 25m
1 stop
SEA4:55 pmSeattle/Tacoma Intl
$599
Find similar
British Airways
Mar 7
SEA1:35 pmSeattle/Tacoma Intl
16h 40m
1 stop
BHD2:15 pmBelfast City
Mar 18
BHD12:25 pmBelfast City
12h 30m
1 stop
SEA5:55 pmSeattle/Tacoma Intl
$603
Find similar
British Airways
Mar 7
SEA7:15 amSeattle/Tacoma Intl
23h 00m
2 stops
BHD2:15 pmBelfast City
Mar 18
BHD9:15 amBelfast City
15h 40m
1 stop
SEA5:55 pmSeattle/Tacoma Intl
$619
Find similar

Delta flights from Seattle to Belfast City Airport

Our best Delta deals on Seattle to Belfast City Airport flight tickets
Delta
Mar 7
SEA7:10 amSeattle/Tacoma Intl
25h 40m
2 stops
BHD4:50 pmBelfast City
Mar 17
BHD6:30 amBelfast City
13h 05m
1 stop
SEA12:35 pmSeattle/Tacoma Intl
$650
Find similar
Delta
Mar 7
SEA7:10 amSeattle/Tacoma Intl
25h 40m
2 stops
BHD4:50 pmBelfast City
Mar 17
BHD6:30 amBelfast City
19h 34m
2 stops
SEA7:04 pmSeattle/Tacoma Intl
$660
Find similar
Delta
Mar 17
SEA5:30 amSeattle/Tacoma Intl
32h 30m
2 stops
BHD9:00 pmBelfast City
Mar 31
BHD5:30 pmBelfast City
30h 20m
1 stop
SEA3:50 pmSeattle/Tacoma Intl
$790
Find similar

momondo Fare Finder

 
Customize your flight search to find flights from Seattle to Belfast City 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 December 10, 2025.
Use the filters below to find and compare flights from Seattle to Belfast City Airport that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Sun 2/1

6:50 pm-4:50 pm

1 stop14h 00m

Belfast City

Mon 2/9

11:30 am-4:55 pm

1 stop13h 25m

$599

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Sat 3/7

1:35 pm-2:15 pm

1 stop16h 40m

Belfast City

Wed 3/18

12:25 pm-5:55 pm

1 stop12h 30m

$603

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Sat 3/7

7:15 am-2:15 pm

2 stops23h 00m

Belfast City

Wed 3/18

9:15 am-5:55 pm

1 stop15h 40m

$619

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Sat 3/7

7:15 am-2:15 pm

2 stops23h 00m

Belfast City

Wed 3/18

6:35 am-9:54 pm

2 stops22h 19m

$622

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Sun 2/1

6:12 am-10:20 am

2 stops20h 08m

Belfast City

Mon 2/9

6:35 am-10:20 pm

2 stops23h 45m

$623

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Fri 1/30

6:50 pm-5:15 pm

1 stop14h 25m

Belfast City

Tue 2/3

6:35 am-11:30 am

1 stop12h 55m

$624

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Sat 3/7

7:10 am-4:50 pm

2 stops25h 40m

Belfast City

Tue 3/17

6:30 am-12:35 pm

1 stop13h 05m

$650

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Sat 3/7

7:10 am-4:50 pm

2 stops25h 40m

Belfast City

Tue 3/17

6:30 am-7:04 pm

2 stops19h 34m

$660

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Tue 4/14

8:20 pm-4:25 pm

1 stop12h 05m

Belfast City

Sun 4/26

7:10 pm-11:35 am

1 stop24h 25m

$689

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Thu 4/16

1:33 pm-3:30 pm

2 stops17h 57m

Belfast City

Mon 4/27

9:50 am-6:25 pm

1 stop16h 35m

$706

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 Seattle to Belfast City 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 City Airport?

On average, the least expensive day to fly to Belfast City Airport from Seattle is on a Thursday. momondo users have found tickets for Thursday departures for as low as $782. However, this price may fluctuate depending on the airline, the season, and holidays. On the other hand, Friday is the most expensive day to depart from Seattle because it is more convenient for both business and leisure travelers. As a result, prices tend to be around $794.

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

According to our data, the cheapest time of day to fly to Belfast City Airport is in the evening. momondo users have found flights departing from Seattle to Belfast City Airport in the evening for as low as $772. Keep in mind that these prices may fluctuate based on what airline you choose and the time of year you plan to travel. Flights at noon are often more expensive with an average ticket price of $782.

When to book flights from Seattle to Belfast City Airport

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

Cheap Seattle to Belfast City Airport (SEA to BHD) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Seattle to Belfast City Airport

Fastest flight time

12h 35m

Direct flights

None
The fastest flight from Seattle to Belfast City Airport takes 12h 35m
There are no direct flights from Seattle to Belfast City Airport. There are no popular flight routes from Seattle to Belfast City Airport.
Search flight deals

  • How far is Seattle/Tacoma Intl to Belfast City by plane?

    Belfast City is 4463.4 mi away from Seattle/Tacoma Intl. In terms of flight time, this usually takes a little over 12h 35m.

  • When did momondo last update prices for flights from Seattle/Tacoma Intl Airport to Belfast City Airport?

    Prices for flights from Seattle/Tacoma Intl Airport to Belfast City Airport are refreshed on a daily basis.

  • How old do you have to be to fly from Seattle/Tacoma Intl Airport to Belfast City 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 Seattle/Tacoma Intl Airport to Belfast City Airport.

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

    The travel and health documents required for your trip to Belfast City Airport can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at Belfast City Airport. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

Traveling to a place near Belfast?

Book flights to Belfast if you plan to visit one of these locations
Newcastle
Bangor

Why use momondo?

Why should I use momondo to find a flight deal from Seattle to Belfast?

momondo collates all your flight options in one place and lets you filter them to find the perfect flight from Seattle to Belfast. momondo saves you time and could save you money on your trip.

Can I find flights from Seattle to Belfast with flexible booking policies on momondo?

Yes. momondo enables you to select and highlight flights to Belfast from Seattle with this policy.

How can momondo help me find flights from Seattle to Belfast?

momondo provides multiple filters to help you find the best flight to Belfast from Seattle. Filter by price, airline, airports, cabin, aircraft, payment method, number of stops and more.

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

Price alerts on flights to Belfast from Seattle are quick and easy to set up on momondo. Simply perform a search and select the price alert feature. It is as simple as that.

An easier way to manage your Belfast City Airport trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.
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