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Belfast Intl

$2,658+ 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 4/24. Fares are subject to change and may not be available on all flights or dates of travel.
STL — BFS
ene. 11 — ene. 181
dom. 1/11
dom. 1/18
1 adult, Economy
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Cheap flight deals from St. Louis to Belfast Intl

Best flights from St. Louis to Belfast Intl
Discover carefully curated flight deals from St. Louis to Belfast Intl that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated diciembre 12, 2025.

This Mytrip deal was found by Cheapflights users on 12/10. 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.
vie. 4/243:30 pmSTL - BFS
2 stops16h 45mMultiple Airlines
lun. 5/49:25 pmBFS - STL
3 stops46h 05mMultiple Airlines
Deal found 12/10$2,658
This Mytrip deal was found by Cheapflights users on 12/11. 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.
sáb. 6/61:00 pmSTL - BFS
3 stops27h 40mMultiple Airlines
vie. 6/127:55 pmBFS - STL
3 stops47h 35mMultiple Airlines
Deal found 12/11$2,827

Find 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 diciembre 12, 2025.

Most accurate provider

Justfly.com
3 stars

Most trusted provider

Justfly.com
3 stars

Round-trip from

$2,658
(Mytrip)
Provider with most accurate pricing for Lambert-St Louis-Belfast Intl flight deals.
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Provider most trusted by Cheapflights users for Lambert-St Louis-Belfast Intl flights.
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From Lambert-St Louis to Belfast Intl
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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 diciembre 12, 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

vie. 4/24

3:30 pm-2:15 pm

2 stops16h 45m

Belfast Intl

lun. 5/4

9:25 pm-1:30 pm

3 stops46h 05m

$2,658

St. LouisBelfast

STL - BFS

STLBFS

Lambert-St Louis

sáb. 6/6

1:00 pm-10:40 pm

3 stops27h 40m

Belfast Intl

vie. 6/12

7:55 pm-1:30 pm

3 stops47h 35m

$2,827

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/10

Compare providers for flights from St. Louis to Belfast Intl

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from St. Louis to Belfast Intl in December.
ProviderPrice AccuracyTrust Score*
FlightHubPrice Accuracy3 starsTrust Score*1 star
Justfly.comPrice Accuracy3 starsTrust Score*3 stars
eDreamsPrice Accuracy3 starsTrust Score*3 stars
OvagoPrice Accuracy2 starsTrust Score*2 stars
AranGrantPrice Accuracy2 starsTrust Score*3 stars
CheapflightsfaresPrice Accuracy3 starsTrust Score*2 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on St. Louis-Belfast Intl Airport flights, users find the pricing of Justfly.com to be most consistent on Cheapflights vs. Justfly.com Users can find the same prices on St. Louis-Belfast Intl Airport flight deals on Cheapflights vs. Justfly.com >95% of the time. Price accuracy is based on data collected from St. Louis-Belfast Intl Airport flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on St. Louis-Belfast Intl Airport flights, Cheapflights users trust Justfly.com the most. Justfly.com has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for St. Louis-Belfast Intl Airport flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

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 diciembre 12, 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 in the morning, which can drop the price by up to 50% versus a flight at noon.

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. 0 airlines 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.

  • 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.

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