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$583+ 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 9/29. Fares are subject to change and may not be available on all flights or dates of travel.
STL — BHD
oct. 15 — oct. 221
mié. 10/15
mié. 10/22
1 adult, Economy
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Cheap 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 septiembre 15, 2025.

Round-trip from

$583
(Trip.com)
From Lambert-St Louis to Belfast
Search Deals

Find 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 septiembre 15, 2025.

This Trip.com deal was found by Cheapflights users on 9/15. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 9/291:26 pmSTL - BFS
2 stops27h 44mMultiple Airlines
mar. 10/76:45 amBFS - STL
2 stops21h 19mMultiple Airlines
Deal found 9/15$583
This American Airlines deal was found by Cheapflights users on 9/15. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 9/297:59 pmSTL - BHD
2 stops15h 31mAmerican Airlines
mar. 10/79:35 amBHD - STL
2 stops17h 54mAmerican Airlines
Deal found 9/15$706
This Mytrip deal was found by Cheapflights users on 9/12. 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.
mar. 10/284:05 pmSTL - BFS
3 stops27h 35mMultiple Airlines
mar. 11/49:35 amBFS - STL
3 stops34h 20mMultiple Airlines
Deal found 9/12$1,739
This Mytrip deal was found by Cheapflights users on 9/14. 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.
mié. 10/294:50 pmSTL - BFS
2 stops18h 20mMultiple Airlines
mié. 11/58:50 pmBFS - STL
3 stops47h 05mMultiple Airlines
Deal found 9/14$1,877
This Mytrip deal was found by Cheapflights users on 9/15. 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.
lun. 9/291:30 pmSTL - BHD
3 stops20h 55mMultiple Airlines
mar. 10/75:55 pmBHD - STL
3 stops31h 43mMultiple Airlines
Deal found 9/15$2,032
This Expedia deal was found by Cheapflights users on 9/12. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 9/261:03 pmSTL - BHD
2 stops23h 12mMultiple Airlines
vie. 10/36:35 amBHD - STL
2 stops20h 31mMultiple Airlines
Deal found 9/12$2,883
This Arangrant deal was found by Cheapflights users on 9/13. 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 Arangrant is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 12/261:59 pmSTL - BHD
2 stops14h 31mBritish Airways
vie. 1/96:45 amBHD - STL
2 stops19h 38mBritish Airways
Deal found 9/13$3,585
This Arangrant deal was found by Cheapflights users on 9/13. 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 Arangrant is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 12/276:35 pmSTL - BHD
2 stops16h 10mBritish Airways
vie. 1/911:30 amBHD - STL
2 stops18h 02mBritish Airways
Deal found 9/13$3,655
This Arangrant deal was found by Cheapflights users on 9/13. 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 Arangrant is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 12/252:00 pmSTL - BHD
2 stops14h 20mMultiple Airlines
vie. 1/96:45 amBHD - STL
2 stops19h 38mMultiple Airlines
Deal found 9/13$3,666
This American Airlines deal was found by Cheapflights users on 9/13. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
dom. 12/2810:01 amSTL - BHD
2 stops18h 19mAmerican Airlines
vie. 1/96:45 amBHD - STL
2 stops18h 22mAmerican Airlines
Deal found 9/13$3,705
This American Airlines deal was found by Cheapflights users on 9/13. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 12/245:11 pmSTL - BHD
2 stops35h 09mAmerican Airlines
vie. 1/911:30 amBHD - STL
2 stops18h 02mAmerican Airlines
Deal found 9/13$3,711

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 septiembre 15, 2025.
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 - BFS

STLBFS

Lambert-St Louis

lun. 9/29

1:26 pm-11:10 pm

2 stops27h 44m

Belfast Intl

mar. 10/7

6:45 am-10:04 pm

2 stops21h 19m

$583

St. LouisBelfast

STL - BHD

STLBHD

Lambert-St Louis

lun. 9/29

7:59 pm-5:30 pm

2 stops15h 31m

Belfast City

mar. 10/7

9:35 am-9:29 pm

2 stops17h 54m

$706

St. LouisBelfast

STL - BHD

STLBHD

Lambert-St Louis

dom. 3/1

11:51 am-4:50 pm

2 stops22h 59m

Belfast City

jue. 3/5

6:30 am-4:50 pm

2 stops16h 20m

$801

St. LouisBelfast

STL - BHD

STLBHD

Lambert-St Louis

dom. 3/1

10:45 am-9:00 pm

2 stops28h 15m

Belfast City

jue. 3/5

6:30 am-4:50 pm

2 stops16h 20m

$801

St. LouisBelfast

STL - BFS

STLBFS

Lambert-St Louis

mar. 10/28

4:05 pm-12:40 am

3 stops27h 35m

Belfast Intl

mar. 11/4

9:35 am-1:55 pm

3 stops34h 20m

$1,739

St. LouisBelfast

STL - BFS

STLBFS

Lambert-St Louis

mié. 10/29

4:50 pm-4:10 pm

2 stops18h 20m

Belfast Intl

mié. 11/5

8:50 pm-1:55 pm

3 stops47h 05m

$1,877

St. LouisBelfast

STL - BHD

STLBHD

Lambert-St Louis

lun. 9/29

1:30 pm-4:25 pm

3 stops20h 55m

Belfast City

mar. 10/7

5:55 pm-7:38 pm

3 stops31h 43m

$2,032

St. LouisBelfast

STL - BHD

STLBHD

Lambert-St Louis

vie. 9/26

1:03 pm-6:15 pm

2 stops23h 12m

Belfast City

vie. 10/3

6:35 am-9:06 pm

2 stops20h 31m

$2,883

St. LouisBelfast

STL - BHD

STLBHD

Lambert-St Louis

vie. 12/26

1:59 pm-10:30 am

2 stops14h 31m

Belfast City

vie. 1/9

6:45 am-8:23 pm

2 stops19h 38m

$3,585

St. LouisBelfast

STL - BHD

STLBHD

Lambert-St Louis

sáb. 12/27

6:35 pm-4:45 pm

2 stops16h 10m

Belfast City

vie. 1/9

11:30 am-11:32 pm

2 stops18h 02m

$3,655

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/15

Showing 1-10 of 13 results
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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

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

Find hourly flight availability from St. Louis to Belfast. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated septiembre 15, 2025.

When flying from St. Louis to Belfast, the time of day you fly usually plays a role in the price. Save by searching for a flight at noon, which can drop the price by up to 48% versus a flight in the morning.

Reviews of airlines servicing Belfast

Get insights into the airlines that provide service to Belfast. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Belfast. Reviews last updated septiembre 15, 2025.
Get a feel of what it's like to fly with American Airlines from St. Louis to Belfast by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
American Airlines
7.2
Good
10,000 reviews

Entertainment

6.9

Overall

7.2

Comfort

7.2

Boarding

7.5

Crew

8.0

Food

6.4

Reviews

1 / 20
2.0
Mediocre

Jeremy,Sep 2025

SAN - PHL

Terrible. Bad customer service and unacceptable delay on the tarmac
American Airlines
7.2
Good
10,000 reviews
American Airlines
7.2
Good
10,000 reviews

Entertainment

6.9

Overall

7.2

Comfort

7.2

Boarding

7.5

Crew

8.0

Food

6.4

Reviews

1 / 20
2.0
Mediocre

Jeremy,Sep 2025

SAN - PHL

Terrible. Bad customer service and unacceptable delay on the tarmac

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 1 airline.

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

    Departing from St. Louis to Belfast will take you 15h 31m. The distance between St. Louis and Belfast is about 3893 mi. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

  • What is the cheapest airline to fly from St. Louis to Belfast round-trip?

    Our cheapest airline available from St. Louis to Belfast is American Airlines. Our recent data shows that you can find tickets from as low as $674 on this airline.

  • 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.

  • What is the cheapest month to book a flight from St. Louis to Belfast?

    Currently, February is the cheapest month in which you can book a flight from St. Louis to Belfast (average of $657). Flying from St. Louis to Belfast in June is currently the most expensive (average of $1,189). 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

Browse thousands of different options on Cheapflights for your next trip

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Alternative routes for St. Louis to Belfast

See prices for flight routes from nearby airports that may be better suited for you.
Kansas City to Belfast City flights
St. Louis to Belfast Intl flights
St. Louis to Belfast City flights

Top airline flying from St. Louis to Belfast

Discover the top airline that operate flights from St. Louis to Belfast. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated septiembre 15, 2025.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest$674Average$832FlexibilityNo cancel feeOn-time71%

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