Latest deals
FAQs
Price Alerts

Cheap flights from St. Louis to Belfast from $1,115

This is the cheapest round-trip flight price found by a momondo user in the last 72 hours by searching for a flight from St. Louis to Belfast departing on 6/9. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
0 bags

Save money when you book flights with momondo

Big names and deals

Big names and deals

Search 100s of travel sites to compare prices.

Filter for what you want

Filter for what you want

Free Wi-Fi? Stopover? Instantly customize your results.

Trusted and free

Trusted and free

We’re completely free to use - no hidden charges or fees.

Price Alerts

Price Alerts

Not ready to book? to track prices.
Search flight deals

Find the cheapest flights from St. Louis to Belfast

Cheap round-trip flights

Enter your travel dates to find the best prices.
Multiple Airlines Logo
8:40 am - 7:50 pm
STL
-
BFS
29h 10m
2 stops
Multiple Airlines Logo
9:05 pm - 12:21 pm
BFS
-
STL
45h 16m
3 stops
$1,115Multiple Airlines
Tue, Jun 9 - Fri, Jun 19
Multiple Airlines Logo
1:05 pm - 7:50 pm
STL
-
BFS
24h 45m
3 stops
Multiple Airlines Logo
9:05 pm - 12:21 pm
BFS
-
STL
45h 16m
3 stops
$1,129Multiple Airlines
Tue, Jun 9 - Fri, Jun 19
Multiple Airlines Logo
1:05 pm - 6:25 pm
STL
-
BFS
23h 20m
3 stops
Multiple Airlines Logo
9:25 pm - 8:25 pm
BFS
-
STL
29h 00m
3 stops
$1,224Multiple Airlines
Sun, Jun 14 - Sun, Jun 21
British Airways Logo
7:51 pm - 8:50 am
STL
-
BHD
30h 59m
2 stops
British Airways Logo
8:10 pm - 11:59 pm
BHD
-
STL
33h 49m
2 stops
$1,283British Airways
Sun, Jun 14 - Sun, Jun 21
American Airlines Logo
6:13 pm - 6:10 pm
STL
-
BHD
17h 57m
2 stops
American Airlines Logo
9:35 am - 12:16 am
BHD
-
STL
20h 41m
2 stops
$1,285American Airlines
Fri, Jun 12 - Fri, Jun 19
Multiple Airlines Logo
7:22 am - 8:45 pm
STL
-
BFS
31h 23m
3 stops
Multiple Airlines Logo
9:05 pm - 12:21 pm
BFS
-
STL
45h 16m
3 stops
$1,298Multiple Airlines
Fri, Jun 12 - Fri, Jun 19
American Airlines Logo
6:13 pm - 6:10 pm
STL
-
BHD
17h 57m
2 stops
American Airlines Logo
6:30 am - 7:30 pm
BHD
-
STL
19h 00m
1 stop
$1,425American Airlines
Fri, Jun 12 - Fri, Jun 19
British Airways Logo
9:40 pm - 2:35 pm
STL
-
BHD
10h 55m
1 stop
British Airways Logo
8:10 pm - 11:59 pm
BHD
-
STL
33h 49m
2 stops
$1,477British Airways
Sun, Jun 14 - Sun, Jun 21
American Airlines Logo
9:35 pm - 6:10 pm
STL
-
BHD
14h 35m
1 stop
American Airlines Logo
6:30 am - 7:30 pm
BHD
-
STL
19h 00m
1 stop
$1,714American Airlines
Fri, Jun 12 - Fri, Jun 19
British Airways Logo
4:29 pm - 3:40 pm
STL
-
BHD
17h 11m
2 stops
British Airways Logo
6:30 am - 6:02 pm
BHD
-
STL
17h 32m
2 stops
$7,046British Airways
Wed, Sep 9 - Wed, Sep 16

British Airways flights from St. Louis to Belfast

Our best British Airways deals on St. Louis to Belfast flight tickets
British Airways
Jun 14
STL7:51 pmLambert-St Louis
30h 59m
2 stops
BHD8:50 amBelfast City
Jun 21
BHD8:10 pmBelfast City
33h 49m
2 stops
STL11:59 pmLambert-St Louis
$1,283
British Airways
Jun 14
STL9:40 pmLambert-St Louis
10h 55m
1 stop
BHD2:35 pmBelfast City
Jun 21
BHD8:10 pmBelfast City
33h 49m
2 stops
STL11:59 pmLambert-St Louis
$1,477
British Airways
Sep 9
STL4:29 pmLambert-St Louis
17h 11m
2 stops
BHD3:40 pmBelfast City
Sep 16
BHD6:30 amBelfast City
17h 32m
2 stops
STL6:02 pmLambert-St Louis
$7,046

American Airlines flights from St. Louis to Belfast

Our best American Airlines deals on St. Louis to Belfast flight tickets
American Airlines
Jun 12
STL6:13 pmLambert-St Louis
17h 57m
2 stops
BHD6:10 pmBelfast City
Jun 19
BHD9:35 amBelfast City
20h 41m
2 stops
STL12:16 amLambert-St Louis
$1,285
American Airlines
Jun 12
STL6:13 pmLambert-St Louis
17h 57m
2 stops
BHD6:10 pmBelfast City
Jun 19
BHD6:30 amBelfast City
19h 00m
1 stop
STL7:30 pmLambert-St Louis
$1,425
American Airlines
Jun 12
STL9:35 pmLambert-St Louis
14h 35m
1 stop
BHD6:10 pmBelfast City
Jun 19
BHD6:30 amBelfast City
19h 00m
1 stop
STL7:30 pmLambert-St Louis
$1,714

momondo 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, momondo users made 832,500 searches. Data last updated May 16, 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

St. LouisBelfast

STL - BFS

STLBFS

Lambert-St Louis

Tue 6/9

8:40 am-7:50 pm

2 stops29h 10m

Belfast Intl

Fri 6/19

9:05 pm-12:21 pm

3 stops45h 16m

$1,115

St. LouisBelfast

STL - BFS

STLBFS

Lambert-St Louis

Tue 6/9

1:05 pm-7:50 pm

3 stops24h 45m

Belfast Intl

Fri 6/19

9:05 pm-12:21 pm

3 stops45h 16m

$1,129

St. LouisBelfast

STL - BFS

STLBFS

Lambert-St Louis

Sun 6/14

1:05 pm-6:25 pm

3 stops23h 20m

Belfast Intl

Sun 6/21

9:25 pm-8:25 pm

3 stops29h 00m

$1,224

St. LouisBelfast

STL - BHD

STLBHD

Lambert-St Louis

Sun 6/14

7:51 pm-8:50 am

2 stops30h 59m

Belfast City

Sun 6/21

8:10 pm-11:59 pm

2 stops33h 49m

$1,283

St. LouisBelfast

STL - BHD

STLBHD

Lambert-St Louis

Fri 6/12

6:13 pm-6:10 pm

2 stops17h 57m

Belfast City

Fri 6/19

9:35 am-12:16 am

2 stops20h 41m

$1,285

St. LouisBelfast

STL - BFS

STLBFS

Lambert-St Louis

Fri 6/12

7:22 am-8:45 pm

3 stops31h 23m

Belfast Intl

Fri 6/19

9:05 pm-12:21 pm

3 stops45h 16m

$1,298

St. LouisBelfast

STL - BHD

STLBHD

Lambert-St Louis

Fri 6/12

6:13 pm-6:10 pm

2 stops17h 57m

Belfast City

Fri 6/19

6:30 am-7:30 pm

1 stop19h 00m

$1,425

St. LouisBelfast

STL - BHD

STLBHD

Lambert-St Louis

Sun 6/14

9:40 pm-2:35 pm

1 stop10h 55m

Belfast City

Sun 6/21

8:10 pm-11:59 pm

2 stops33h 49m

$1,477
Quickest round-trip

St. LouisBelfast

STL - BHD

STLBHD

Lambert-St Louis

Fri 6/12

9:35 pm-6:10 pm

1 stop14h 35m

Belfast City

Fri 6/19

6:30 am-7:30 pm

1 stop19h 00m

$1,714

St. LouisBelfast

STL - BHD

STLBHD

Lambert-St Louis

Wed 9/9

4:29 pm-3:40 pm

2 stops17h 11m

Belfast City

Wed 9/16

6:30 am-6:02 pm

2 stops17h 32m

$7,046

Flights are sorted by cheapest round-trip flights first.

Sorted by cheapest first

Cheap St. Louis to Belfast flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from St. Louis to Belfast

Fastest flight time

15h 00m

Direct flights

None
The fastest flight from St. Louis to Belfast takes 15h 00m
There are no direct flights from St. Louis to Belfast. There are no popular flight routes from St. Louis to Belfast.
Search flight deals

Frequently asked questions about flying from St. Louis to Belfast

  • How far is Lambert-St Louis to Belfast by plane?

    The straight-line distance from Lambert-St Louis to Belfast is 3891.1 mi. Flights usually cover this in 15h 00m, depending on flying conditions and air traffic around both airports.

  • When did momondo last update prices for flights from Lambert-St Louis Airport to Belfast?

    Prices for flights from Lambert-St Louis Airport to Belfast are refreshed on a daily basis.

  • How old do you have to be to fly from Lambert-St Louis Airport to Belfast?

    The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from Lambert-St Louis Airport to Belfast.

  • What documentation or ID do you need to fly to Belfast?

    The travel and health documents required for your trip to Belfast can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at Belfast. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

Frequently asked questions about flying from St. Louis to Belfast

  • How do I get Price Alerts for flights from St. Louis to Belfast?

    Price Alerts will notify you by email when the price for flights to Belfast from St. Louis decreases. To activate this, select your desired travel dates and search for offers. While browsing through offers you’ll see the Price Alert widget toggle. Click it to turn on notifications.

  • How can I save money on flights from St. Louis to Belfast with momondo?

    By using tools like our “Price Calendar”, you can see the best day to fly round-trip for your travels. Our “Price Forecast” tool uses AI to predict whether you should purchase or hold off on booking for potentially cheaper prices. Explore shows you all flight options from a city or airport to build your own unique adventure. The Discover blog also provides valuable insights for saving money while booking your experience. After searching you can toggle on “Price Alerts” to track prices for your desired flight and book at the ideal moment.

  • How does momondo find its flight prices?

    momondo shows deals across 700+ competitors all at once. momondo is active in 30 international markets, so you can have access to a wide range of options from airlines and OTAs alike.

Why use momondo?

Why should I use momondo to find a flight deal from St. Louis to Belfast?

To find the flight that best suits your needs, momondo gathers a range of flights from a large pool of different airlines and agents; you can then use our insights and filters to find and book the right flight to Belfast from St. Louis.

Can I find flights from St. Louis to Belfast with flexible booking policies on momondo?

Yes. momondo allows you to filter the results for St. Louis to Belfast flights to just show those with flexible booking policies.

How can momondo help me find flights from St. Louis to Belfast?

Once all potential St. Louis to Belfast flight options are in front of you, momondo lets you sort and filter flights based on preferences such as airline, price and flight times amongst many other options.

I’m not ready to book a flight from St. Louis to Belfast right now. Can momondo alert me if prices change?

Yes momondo offers price alerts on flights to Belfast from St. Louis. After performing a search on this page you should be able to see the price alert set up feature. Simply provide a valid email address and momondo will instantly alert you when prices change.

An easier way to manage your Belfast trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.
Start using Trips
Find my bookings

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.
1 adult
Mon 6/15
Mon 6/22
By creating a price alert you accept our terms of use and privacy policy.

Find better results for your trip to the United Kingdom

Fly into one of these airports located in Belfast

Airports listed have a maximum distance of 12.2 mi from Belfast
Belfast Intl Airport
Belfast City Airport