HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Belfast

$909+ 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 8/23. Fares are subject to change and may not be available on all flights or dates of travel.
STL — BHD
may. 23 — may. 301
sáb. 5/23
sáb. 5/30
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from St. Louis to Belfast with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

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 abril 23, 2026.

This British Airways deal was found by Cheapflights users on 4/21. 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.
dom. 8/239:40 pm
STL
-
BHD
1 stop10h 55m
British Airways
mié. 8/2611:35 am
BHD
-
STL
1 stop13h 55m
British Airways
Deal found 4/21$909
This American Airlines deal was found by Cheapflights users on 4/19. 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.
mar. 8/46:12 pm
STL
-
BHD
2 stops17h 23m
American Airlines
jue. 8/139:35 am
BHD
-
STL
2 stops19h 48m
American Airlines
Deal found 4/19$939
This Priceline deal was found by Cheapflights users on 4/19. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 8/49:35 pm
STL
-
BHD
1 stop14h 00m
British Airways
jue. 8/139:35 am
BHD
-
STL
2 stops18h 50m
British Airways
Deal found 4/19$968
This American Airlines deal was found by Cheapflights users on 4/18. 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.
vie. 9/43:25 pm
STL
-
BHD
2 stops18h 05m
American Airlines
vie. 9/116:30 am
BHD
-
STL
2 stops18h 28m
American Airlines
Deal found 4/18$1,047
This FlightHub deal was found by Cheapflights users on 4/19. 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.
sáb. 8/13:55 pm
STL
-
BHD
2 stops34h 45m
British Airways
mar. 8/118:25 pm
BHD
-
STL
2 stops33h 26m
British Airways
Deal found 4/19$1,061
This FlightHub deal was found by Cheapflights users on 4/18. 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.
vie. 9/46:06 am
STL
-
BHD
2 stops30h 04m
British Airways
vie. 9/116:30 am
BHD
-
STL
1 stop19h 00m
British Airways
Deal found 4/18$1,094
This British Airways deal was found by Cheapflights users on 4/19. 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.
mar. 12/18:40 am
STL
-
BHD
2 stops20h 50m
British Airways
vie. 12/411:30 am
BHD
-
STL
2 stops18h 28m
British Airways
Deal found 4/19$1,124
This Mytrip deal was found by Cheapflights users on 4/22. 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. 6/68:40 am
STL
-
BFS
3 stops28h 15m
Multiple Airlines
sáb. 6/136:55 am
BFS
-
STL
3 stops35h 11m
Multiple Airlines
Deal found 4/22$1,184
This Mytrip deal was found by Cheapflights users on 4/21. 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. 6/52:15 pm
STL
-
BFS
2 stops25h 35m
Multiple Airlines
vie. 6/126:40 pm
BFS
-
STL
3 stops47h 26m
Multiple Airlines
Deal found 4/21$1,223

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 abril 23, 2026.

Round-trip from

$909
(British Airways)
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 abril 23, 2026.
Use the filters below to find and compare flights from St. Louis to Belfast that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip
Quickest round-trip

St. LouisBelfast

STL - BHD

STLBHD

Lambert-St Louis

dom. 8/23

9:40 pm-2:35 pm

1 stop10h 55m

Belfast City

mié. 8/26

10:05 am-7:30 pm

1 stop15h 25m

$910

St. LouisBelfast

STL - BHD

STLBHD

Lambert-St Louis

vie. 9/4

3:25 pm-3:30 pm

2 stops18h 05m

Belfast City

vie. 9/11

6:30 am-6:58 pm

2 stops18h 28m

$1,047

St. LouisBelfast

STL - BHD

STLBHD

Lambert-St Louis

vie. 9/4

6:06 am-6:10 pm

2 stops30h 04m

Belfast City

vie. 9/11

6:30 am-7:30 pm

1 stop19h 00m

$1,094

St. LouisBelfast

STL - BHD

STLBHD

Lambert-St Louis

sáb. 8/1

9:08 am-10:05 am

2 stops18h 57m

Belfast City

mar. 8/11

7:30 pm-7:30 pm

1 stop30h 00m

$1,153

St. LouisBelfast

STL - BHD

STLBHD

Lambert-St Louis

mar. 8/4

9:35 pm-5:35 pm

1 stop14h 00m

Belfast City

jue. 8/13

8:35 pm-7:30 pm

1 stop28h 55m

$1,154

St. LouisBelfast

STL - BFS

STLBFS

Lambert-St Louis

sáb. 6/6

8:40 am-6:55 pm

3 stops28h 15m

Belfast Intl

sáb. 6/13

6:55 am-12:06 pm

3 stops35h 11m

$1,184

St. LouisBelfast

STL - BFS

STLBFS

Lambert-St Louis

vie. 6/5

2:15 pm-9:50 pm

2 stops25h 35m

Belfast Intl

vie. 6/12

6:40 pm-12:06 pm

3 stops47h 26m

$1,223

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/18

Sorted by cheapest first

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 10h 55m. 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

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Complete your trip

Complete your trip to Belfast by adding a car rental and/or hotel reservation to your travel itinerary.
Belfast car rentals
Belfast Intl Airport car rentals

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.