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$688+ Cheap flights from St. Louis (STL) to Belfast

This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 8/19. Fares are subject to change and may not be available on all flights or dates of travel.
STL — BHD
Mar 14 — Mar 211
Sat 3/14
Sat 3/21
1 adult, Economy
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Cheap flight deals from St. Louis to Belfast

Cheapest flights from St. Louis to Belfast
Explore the most affordable flight options available from St. Louis to Belfast. Find the lowest fares from popular airlines and budget airlines, with prices last updated on February 12, 2026.

This oojo deal was found by Cheapflights users on 2/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/191:30 pm
STL
-
BHD
2 stops18h 05m
British Airways
Wed 8/2610:05 am
BHD
-
STL
2 stops19h 37m
British Airways
Deal found 2/9$688
This British Airways deal was found by Cheapflights users on 2/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure British Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/189:35 pm
STL
-
BHD
1 stop14h 00m
British Airways
Tue 8/251:45 pm
BHD
-
STL
1 stop11h 45m
British Airways
Deal found 2/9$690
This British Airways deal was found by Cheapflights users on 2/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure British Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/169:40 pm
STL
-
BHD
1 stop16h 55m
British Airways
Mon 8/246:30 pm
BHD
-
STL
1 stop31h 00m
British Airways
Deal found 2/9$701
This FlightHub deal was found by Cheapflights users on 2/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/189:35 pm
STL
-
BHD
1 stop11h 45m
British Airways
Wed 8/2611:35 am
BHD
-
STL
2 stops18h 16m
British Airways
Deal found 2/9$715
This Delta deal was found by Cheapflights users on 2/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/92:18 pm
STL
-
BHD
2 stops20h 32m
Delta
Thu 11/195:20 pm
BHD
-
STL
2 stops29h 46m
Delta
Deal found 2/9$718
This British Airways deal was found by Cheapflights users on 2/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure British Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/199:35 pm
STL
-
BHD
1 stop16h 15m
British Airways
Tue 8/259:40 am
BHD
-
STL
1 stop15h 50m
British Airways
Deal found 2/9$731
This British Airways deal was found by Cheapflights users on 2/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure British Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/219:35 pm
STL
-
BHD
1 stop14h 35m
British Airways
Mon 8/247:35 pm
BHD
-
STL
1 stop29h 55m
British Airways
Deal found 2/9$740
This Delta deal was found by Cheapflights users on 2/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/175:45 pm
STL
-
BHD
2 stops17h 10m
Delta
Fri 8/289:50 am
BHD
-
STL
2 stops19h 47m
Delta
Deal found 2/9$751
This Booking.com deal was found by Cheapflights users on 2/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 3/284:05 pm
STL
-
BFS
3 stops21h 35m
Multiple Airlines
Sat 4/48:20 am
BFS
-
STL
2 stops35h 05m
Multiple Airlines
Deal found 2/11$1,907
This Mytrip deal was found by Cheapflights users on 2/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 3/264:05 pm
STL
-
BFS
2 stops16h 35m
Multiple Airlines
Thu 4/28:20 am
BFS
-
STL
3 stops20h 42m
Multiple Airlines
Deal found 2/9$2,654
This Mytrip deal was found by Cheapflights users on 2/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/234:05 pm
STL
-
BFS
2 stops24h 35m
Multiple Airlines
Sat 3/287:25 pm
BFS
-
STL
2 stops23h 00m
Multiple Airlines
Deal found 2/11$3,492

Find flight deals from St. Louis to Belfast

Discover tips and strategies to find the most affordable flight options for your journey from St. Louis (STL) to Belfast (BF1). 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 February 12, 2026.

Round-trip from

$965
(KAYAK)
From Lambert-St Louis to Belfast
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from St. Louis to Belfast 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 2,558,603 searches. Data last updated February 12, 2026.
Use the filters below to find and compare flights from St. Louis to Belfast that are best for you.

Fly from

St. Louis

Fly to

Belfast

Route

Depart

Return

Price

St. LouisBelfast

STL - BHD

STLBHD

Lambert-St Louis

Mon 3/23

1:34 pm-10:40 am

2 stops16h 06m

Belfast City

Sat 3/28

3:05 pm-6:07 pm

2 stops32h 02m

$965

St. LouisBelfast

STL - BHD

STLBHD

Lambert-St Louis

Wed 2/25

11:59 am-2:15 pm

2 stops20h 16m

Belfast City

Sun 3/1

12:10 pm-11:48 pm

2 stops17h 38m

$1,088

St. LouisBelfast

STL - BFS

STLBFS

Lambert-St Louis

Sat 3/28

4:05 pm-6:40 pm

3 stops21h 35m

Belfast Intl

Sat 4/4

8:20 am-1:25 pm

2 stops35h 05m

$1,907

St. LouisBelfast

STL - BFS

STLBFS

Lambert-St Louis

Thu 3/26

4:05 pm-1:40 pm

2 stops16h 35m

Belfast Intl

Thu 4/2

8:20 am-11:02 pm

3 stops20h 42m

$2,654

St. LouisBelfast

STL - BFS

STLBFS

Lambert-St Louis

Mon 3/23

4:05 pm-9:40 pm

2 stops24h 35m

Belfast Intl

Sat 3/28

7:25 pm-1:25 pm

2 stops23h 00m

$3,492

Flights are sorted by cheapest round-trip flights first.

Deals found on 2/11

Best time to book a flight from St. Louis to Belfast

Have a flexible travel schedule? Discover the best time to fly to Belfast from St. Louis with our price prediction graph.
Estimated round-trip 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.

Cheapflights Insights

Everything you need to know about your flight from St. Louis to Belfast
No data available for this route at this time. Please check back soon.

Related info for your journey

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

  • What airport do you fly from for flights from St. Louis to Belfast?

    Located just 12.7 mi from the city center, Lambert-St Louis is the airport most travelers will use when flying to Belfast from St. Louis. Booking flights from Lambert-St Louis (STL) to Belfast should be relatively easy as there are 0 daily outbound flights to Belfast from 0 different airlines.

  • How long is the flight from St. Louis to Belfast?

    Departing from St. Louis to Belfast will take you 16h 06m. The distance between St. Louis and Belfast is about 3893 mi.

  • Can I find deals for flights from St. Louis to Belfast that include hotel bookings?

    Yes. In addition to deals on St. Louis to Belfast flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from St. Louis to Belfast?

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

  • Can I find deals for business class flights from St. Louis to Belfast?

    Yes. Cheapflights offers flight deals from St. Louis to Belfast by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

See more FAQs

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