Latest deals
Insights
FAQs
Reviews
Price Alerts

Cheap flights from St. Louis to Belfast from $291

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from St. Louis to Belfast departing on 12/13. 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

Discover deals from 900+ travel sites with momondo.

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.
British Airways Logo
6:44 pm - 4:05 pmSTL-BHD
15h 21m2 stops
British Airways Logo
6:35 am - 6:16 pmBHD-STL
17h 41m2 stops
$620British Airways
Find Deal
lun., ene. 12 - mar., ene. 20
British Airways Logo
6:44 pm - 4:05 pmSTL-BHD
15h 21m2 stops
British Airways Logo
6:35 am - 6:16 pmBHD-STL
17h 41m2 stops
$622British Airways
Find Deal
lun., ene. 12 - mar., ene. 20
Delta Logo
6:25 am - 4:50 pmSTL-BHD
28h 25m2 stops
Delta Logo
5:20 pm - 8:34 amBHD-STL
45h 14m2 stops
$648Delta
Find Deal
jue., ene. 8 - mié., ene. 21
Delta Logo
6:10 am - 4:50 pmSTL-BHD
28h 40m2 stops
Delta Logo
5:20 pm - 8:43 pmBHD-STL
33h 23m2 stops
$723Delta
Find Deal
jue., ene. 8 - lun., ene. 19
Delta Logo
12:49 pm - 9:00 pmSTL-BHD
26h 11m2 stops
Delta Logo
5:20 pm - 8:41 pmBHD-STL
33h 21m2 stops
$783Delta
Find Deal
mié., dic. 10 - mié., dic. 24
Delta Logo
4:32 pm - 4:50 pmSTL-BHD
18h 18m2 stops
Delta Logo
6:30 am - 9:02 pmBHD-STL
20h 32m2 stops
$786Delta
Find Deal
mié., dic. 3 - dom., dic. 7
Delta Logo
4:32 pm - 9:00 pmSTL-BHD
22h 28m2 stops
Delta Logo
6:30 am - 11:29 pmBHD-STL
22h 59m2 stops
$787Delta
Find Deal
mié., dic. 3 - dom., dic. 7
American Airlines Logo
12:11 pm - 9:10 amSTL-BHD
14h 59m2 stops
American Airlines Logo
6:35 am - 6:14 pmBHD-STL
17h 39m2 stops
$812American Airlines
Find Deal
mié., ene. 7 - jue., ene. 22
Multiple Airlines Logo
3:50 pm - 3:25 pmSTL-BFS
17h 35m2 stops
Multiple Airlines Logo
8:25 am - 1:55 pmBFS-STL
35h 30m2 stops
$1,236Multiple Airlines
Find Deal
mié., ene. 7 - jue., ene. 22
Multiple Airlines Logo
3:50 pm - 10:10 pmSTL-BFS
24h 20m2 stops
Multiple Airlines Logo
6:30 am - 11:44 pmBFS-STL
23h 14m3 stops
$2,307Multiple Airlines
Find Deal
dom., dic. 14 - dom., dic. 21

British Airways flights from St. Louis to Belfast

Our best British Airways deals on St. Louis to Belfast flight tickets
British Airways
Jan 12
STL6:44 pmLambert-St Louis
15h 21m
2 stops
BHD4:05 pmBelfast City
Jan 20
BHD6:35 amBelfast City
17h 41m
2 stops
STL6:16 pmLambert-St Louis
$620
Find similar
British Airways
Jan 12
STL6:44 pmLambert-St Louis
15h 21m
2 stops
BHD4:05 pmBelfast City
Jan 20
BHD6:35 amBelfast City
17h 41m
2 stops
STL6:16 pmLambert-St Louis
$622
Find similar
British Airways
Dec 10
STL2:48 pmLambert-St Louis
19h 27m
2 stops
BHD4:15 pmBelfast City
Dec 22
BHD7:25 pmBelfast City
30h 05m
2 stops
STL7:30 pmLambert-St Louis
$1,054
Find similar

Delta flights from St. Louis to Belfast

Our best Delta deals on St. Louis to Belfast flight tickets
Delta
Jan 8
STL6:25 amLambert-St Louis
28h 25m
2 stops
BHD4:50 pmBelfast City
Jan 21
BHD5:20 pmBelfast City
45h 14m
2 stops
STL8:34 amLambert-St Louis
$648
Find similar
Delta
Jan 8
STL6:10 amLambert-St Louis
28h 40m
2 stops
BHD4:50 pmBelfast City
Jan 19
BHD5:20 pmBelfast City
33h 23m
2 stops
STL8:43 pmLambert-St Louis
$723
Find similar
Delta
Dec 10
STL12:49 pmLambert-St Louis
26h 11m
2 stops
BHD9:00 pmBelfast City
Dec 24
BHD5:20 pmBelfast City
33h 21m
2 stops
STL8:41 pmLambert-St Louis
$783
Find similar

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 noviembre 20, 2025.
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

St. LouisBelfast

STL - BHD

STLBHD

Lambert-St Louis

lun. 1/12

6:44 pm-4:05 pm

2 stops15h 21m

Belfast City

mar. 1/20

6:35 am-6:16 pm

2 stops17h 41m

$620

St. LouisBelfast

STL - BHD

STLBHD

Lambert-St Louis

lun. 1/12

6:44 pm-4:05 pm

2 stops15h 21m

Belfast City

mar. 1/20

6:35 am-6:16 pm

2 stops17h 41m

$622

St. LouisBelfast

STL - BHD

STLBHD

Lambert-St Louis

jue. 1/8

6:25 am-4:50 pm

2 stops28h 25m

Belfast City

mié. 1/21

5:20 pm-8:34 am

2 stops45h 14m

$648

St. LouisBelfast

STL - BHD

STLBHD

Lambert-St Louis

jue. 1/8

6:10 am-4:50 pm

2 stops28h 40m

Belfast City

lun. 1/19

5:20 pm-8:43 pm

2 stops33h 23m

$723

St. LouisBelfast

STL - BHD

STLBHD

Lambert-St Louis

mié. 12/10

12:49 pm-9:00 pm

2 stops26h 11m

Belfast City

mié. 12/24

5:20 pm-8:41 pm

2 stops33h 21m

$783

St. LouisBelfast

STL - BHD

STLBHD

Lambert-St Louis

mié. 12/3

4:32 pm-4:50 pm

2 stops18h 18m

Belfast City

dom. 12/7

6:30 am-9:02 pm

2 stops20h 32m

$786

St. LouisBelfast

STL - BHD

STLBHD

Lambert-St Louis

mié. 12/3

4:32 pm-9:00 pm

2 stops22h 28m

Belfast City

dom. 12/7

6:30 am-11:29 pm

2 stops22h 59m

$787

St. LouisBelfast

STL - BHD

STLBHD

Lambert-St Louis

mié. 1/7

12:11 pm-9:10 am

2 stops14h 59m

Belfast City

jue. 1/22

6:35 am-6:14 pm

2 stops17h 39m

$812

St. LouisBelfast

STL - BFS

STLBFS

Lambert-St Louis

mié. 1/7

3:50 pm-3:25 pm

2 stops17h 35m

Belfast Intl

jue. 1/22

8:25 am-1:55 pm

2 stops35h 30m

$1,236

St. LouisBelfast

STL - BFS

STLBFS

Lambert-St Louis

dom. 12/14

3:50 pm-10:10 pm

2 stops24h 20m

Belfast Intl

dom. 12/21

6:30 am-11:44 pm

3 stops23h 14m

$2,307

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
1
2

See travel insights to Belfast from

How to get the cheapest flight ticket from St. Louis to Belfast

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the cheapest day to depart on your flight to Belfast?

The cheapest day to depart from St. Louis to Belfast is on a Tuesday when prices can be found for as low as $674. When flying out on a Wednesday, the most expensive travel day of the week, you can expect to see flight prices from St. Louis to Belfast for around $870.

What is the cheapest time of day to depart on your flight to Belfast?

Our data shows that the cheapest St. Louis to Belfast flights are usually those with departure times in the afternoon. Our users have found flights to Belfast in the afternoon for as low as $785. Try not to purchase tickets at noon because they tend to be around $1,429. Of course, these prices can vary depending on the time of year and what airport you fly to.

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

Direct flights

None
There are no direct flights from St. Louis to Belfast. There are no popular flight routes from St. Louis to Belfast.
Search flight deals

  • 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 13h 36m, 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 many operators does momondo search for flights from Lambert-St Louis Airport to Belfast?

  • 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.

Best airlines flying from St. Louis to Belfast

Compare and see reviews for airlines that fly from St. Louis to Belfast with momondo
Airline
Rating
Free Cancellation
Price
American AirlinesPriceFrom $674Free CancellationRating
7.2
11,047 reviews
Search American Airlines flights

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
sáb. 12/20
sáb. 12/27
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