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Belfast Intl

$1,117+ Cheap flights from St. Louis (STL) to Belfast Intl (BFS)

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 10/26. Fares are subject to change and may not be available on all flights or dates of travel.
STL — BFS
Oct 11 — Oct 181
Sat 10/11
Sat 10/18
1 adult, Economy
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Cheap flight deals from St. Louis to Belfast Intl

Discover tips and strategies to find the most affordable flight options for your journey from St. Louis (STL) 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 September 11, 2025.

Round-trip from

$1,117
(Mytrip)
From Lambert-St Louis to Belfast Intl
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Find flight deals from St. Louis to Belfast Intl

Cheapest flights from St. Louis to Belfast Intl
Explore the most affordable flight options available from St. Louis to Belfast Intl. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 11, 2025.

This Mytrip deal was found by Cheapflights users on 9/11. 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.
Sun 10/264:50 pmSTL - BFS
3 stops24h 05mMultiple Airlines
Sun 11/25:45 amBFS - STL
3 stops24h 11mMultiple Airlines
Deal found 9/11$1,117
This Trip.com deal was found by Cheapflights users on 9/10. 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.
Fri 9/261:30 pmSTL - BFS
2 stops16h 25mMultiple Airlines
Sat 10/412:35 pmBFS - STL
2 stops30h 55mMultiple Airlines
Deal found 9/10$1,156
This Mytrip deal was found by Cheapflights users on 9/11. 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 10/274:05 pmSTL - BFS
3 stops25h 30mMultiple Airlines
Mon 11/38:40 amBFS - STL
3 stops21h 16mMultiple Airlines
Deal found 9/11$1,642
This Mytrip deal was found by Cheapflights users on 9/10. 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 9/294:05 pmSTL - BFS
2 stops18h 05mMultiple Airlines
Thu 10/29:55 pmBFS - STL
3 stops27h 43mMultiple Airlines
Deal found 9/10$1,826

Cheapflights Fare Finder

 
Customize your flight search to find flights from St. Louis 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 2,558,603 searches. Data last updated September 11, 2025.
Use the filters below to find and compare flights from St. Louis to Belfast Intl Airport that are best for you.

Fly from

St. Louis

Fly to

Belfast Intl

Route

Depart

Return

Price

St. LouisBelfast

STL - BFS

STLBFS

Lambert-St Louis

Sun 10/26

4:50 pm-9:55 pm

3 stops24h 05m

Belfast Intl

Sun 11/2

5:45 am-12:56 am

3 stops24h 11m

$1,117

St. LouisBelfast

STL - BFS

STLBFS

Lambert-St Louis

Fri 9/26

1:30 pm-11:55 am

2 stops16h 25m

Belfast Intl

Sat 10/4

12:35 pm-1:30 pm

2 stops30h 55m

$1,156

St. LouisBelfast

STL - BFS

STLBFS

Lambert-St Louis

Mon 10/27

4:05 pm-10:35 pm

3 stops25h 30m

Belfast Intl

Mon 11/3

8:40 am-11:56 pm

3 stops21h 16m

$1,642

St. LouisBelfast

STL - BFS

STLBFS

Lambert-St Louis

Mon 9/29

4:05 pm-4:10 pm

2 stops18h 05m

Belfast Intl

Thu 10/2

9:55 pm-7:38 pm

3 stops27h 43m

$1,826

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/11

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

Have a flexible travel schedule? Discover the best time to fly to Belfast Intl 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 Intl Airport

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

Find hourly flight availability from St. Louis to Belfast Intl. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated September 11, 2025.

When flying from St. Louis to Belfast Intl Airport, 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 Intl

Get insights into the airlines that provide service to Belfast Intl. 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 Intl. Reviews last updated September 11, 2025.
See what other customers who have flown with American Airlines from St. Louis to Belfast Intl Airport have to say. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
American Airlines
7.2
Good
10,000 reviews

Boarding

7.5

Entertainment

6.9

Comfort

7.2

Food

6.4

Crew

8.0

Overall

7.2

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

Boarding

7.5

Entertainment

6.9

Comfort

7.2

Food

6.4

Crew

8.0

Overall

7.2

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 Intl. 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 Intl?

    Lambert-St Louis (STL), located 12.7 mi from the city center, is the airport you fly out of when you book flights from St. Louis to Belfast Intl. 1 airline have flights from Lambert-St Louis to Belfast Intl on a regular basis. Booking flights from Lambert-St Louis to Belfast Intl should not be difficult; the airport handles an average of 0 outbound flights to Belfast Intl per day.

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

    According to our current data, American Airlines ($674), offers the cheapest pricing from St. Louis to Belfast Intl Airport.

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

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

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

    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 Intl.

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

    Yes. Cheapflights offers flight deals from St. Louis 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 St. Louis to Belfast Intl Airport?

    Currently, February is the cheapest month in which you can book a flight from St. Louis to Belfast Intl Airport (average of $657). Flying from St. Louis to Belfast Intl Airport 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

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Alternative routes for St. Louis to Belfast Intl

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 City flights

Top airline flying from St. Louis to Belfast Intl

Discover the top airline that operate flights from St. Louis to Belfast Intl. 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 September 11, 2025.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest$674Average$832FlexibilityNo cancel feeOn-time71%

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