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$650+ 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 12/1. Fares are subject to change and may not be available on all flights or dates of travel.
STL — BHD
Nov 29 — Dec 61
Sat 11/29
Sat 12/6
1 adult, Economy
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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 October 30, 2025.

This Air France deal was found by Cheapflights users on 10/29. 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 Air France is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/12:36 pmSTL - BHD
2 stops20h 14mMultiple Airlines
Sun 12/76:30 amBHD - STL
2 stops17h 26mMultiple Airlines
Deal found 10/29$650

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 October 30, 2025.

Round-trip from

$650
(Air France)
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 October 30, 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 - BHD

STLBHD

Lambert-St Louis

Mon 12/1

2:36 pm-4:50 pm

2 stops20h 14m

Belfast City

Sun 12/7

6:30 am-5:56 pm

2 stops17h 26m

$650

St. LouisBelfast

STL - BHD

STLBHD

Lambert-St Louis

Sun 3/1

12:10 pm-4:50 pm

2 stops22h 40m

Belfast City

Thu 3/5

6:30 am-11:10 pm

2 stops22h 40m

$748

St. LouisBelfast

STL - BHD

STLBHD

Lambert-St Louis

Sun 3/1

7:05 pm-4:50 pm

2 stops15h 45m

Belfast City

Thu 3/5

6:30 am-4:55 pm

2 stops16h 25m

$748

St. LouisBelfast

STL - BHD

STLBHD

Lambert-St Louis

Fri 3/27

9:28 am-10:30 am

2 stops20h 02m

Belfast City

Tue 3/31

6:35 am-9:48 pm

2 stops21h 13m

$976

St. LouisBelfast

STL - BHD

STLBHD

Lambert-St Louis

Mon 4/27

7:03 pm-3:40 pm

2 stops14h 37m

Belfast City

Fri 5/29

6:35 am-7:30 pm

1 stop18h 55m

$2,002

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/29

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 October 30, 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 in the evening, which can drop the price by up to 41% versus a flight at noon.

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 October 30, 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
11,034 reviews

Comfort

7.2

Food

6.4

Entertainment

6.9

Boarding

7.5

Overall

7.2

Crew

8.0

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
11,034 reviews
American Airlines
7.2
Good
11,034 reviews

Comfort

7.2

Food

6.4

Entertainment

6.9

Boarding

7.5

Overall

7.2

Crew

8.0

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 45m. 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.

See more FAQs

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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.
St. Louis to Belfast City flights
Kansas City 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 October 30, 2025.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest$674Average$832FlexibilityNo cancel feeOn-time71%

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