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Cheap flights from St. Louis to Belfast from $1,665

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 7/20. 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
1 adult, Economy, 0 bags

Find the cheapest flights from St. Louis to Belfast

Cheap round-trip flights

Enter your travel dates to find the best prices.
KLM Logo
6:09 pm - 4:55 pm
STL
-
BHD
16h 46m
2 stops
KLM Logo
9:50 am - 8:37 pm
BHD
-
STL
16h 47m
2 stops
$1,665KLM
Mon, Jul 20 - Sat, Jul 25
KLM Logo
6:09 pm - 4:55 pm
STL
-
BHD
16h 46m
2 stops
KLM Logo
9:50 am - 8:37 pm
BHD
-
STL
16h 47m
2 stops
$1,666KLM
Mon, Jul 20 - Sat, Jul 25
Multiple Airlines Logo
5:58 pm - 8:55 pm
STL
-
BHD
20h 57m
3 stops
Multiple Airlines Logo
7:05 am - 12:15 am
BHD
-
STL
23h 10m
2 stops
$1,874Multiple Airlines
Mon, Jul 20 - Sat, Jul 25
Multiple Airlines Logo
5:58 pm - 8:55 pm
STL
-
BHD
20h 57m
3 stops
Multiple Airlines Logo
11:05 am - 9:10 am
BHD
-
STL
28h 05m
3 stops
$2,250Multiple Airlines
Mon, Jul 20 - Sat, Jul 25
Multiple Airlines Logo
5:58 pm - 8:55 pm
STL
-
BHD
20h 57m
3 stops
Multiple Airlines Logo
11:05 am - 9:10 am
BHD
-
STL
28h 05m
3 stops
$2,273Multiple Airlines
Mon, Jul 20 - Sat, Jul 25
Multiple Airlines Logo
11:15 am - 3:00 pm
STL
-
BHD
21h 45m
2 stops
Multiple Airlines Logo
4:15 pm - 7:30 pm
BHD
-
STL
33h 15m
1 stop
$2,756Multiple Airlines
Mon, Jul 20 - Sat, Jul 25
Multiple Airlines Logo
11:15 am - 2:50 pm
STL
-
BHD
21h 35m
2 stops
Multiple Airlines Logo
4:15 pm - 7:30 pm
BHD
-
STL
33h 15m
1 stop
$2,758Multiple Airlines
Mon, Jul 20 - Sat, Jul 25

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KLM flights from St. Louis to Belfast City Airport

Our best KLM deals on St. Louis to Belfast City Airport flight tickets
KLM
Jul 20
STL6:09 pmLambert-St Louis
16h 46m
2 stops
BHD4:55 pmBelfast City
Jul 25
BHD9:50 amBelfast City
16h 47m
2 stops
STL8:37 pmLambert-St Louis
$1,665
KLM
Jul 20
STL6:09 pmLambert-St Louis
16h 46m
2 stops
BHD4:55 pmBelfast City
Jul 25
BHD9:50 amBelfast City
16h 47m
2 stops
STL8:37 pmLambert-St Louis
$1,666

momondo Fare Finder

 
Customize your flight search to find flights from St. Louis to Belfast City Airport 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 July 6, 2026.
Use the filters below to find and compare flights from St. Louis to Belfast City Airport 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

Mon 7/20

6:09 pm-4:55 pm

2 stops16h 46m

Belfast City

Sat 7/25

9:50 am-8:37 pm

2 stops16h 47m

$1,665

St. LouisBelfast

STL - BHD

STLBHD

Lambert-St Louis

Mon 7/20

6:09 pm-4:55 pm

2 stops16h 46m

Belfast City

Sat 7/25

9:50 am-8:37 pm

2 stops16h 47m

$1,666

St. LouisBelfast

STL - BHD

STLBHD

Lambert-St Louis

Mon 7/20

5:58 pm-8:55 pm

3 stops20h 57m

Belfast City

Sat 7/25

7:05 am-12:15 am

2 stops23h 10m

$1,874

St. LouisBelfast

STL - BHD

STLBHD

Lambert-St Louis

Mon 7/20

5:58 pm-8:55 pm

3 stops20h 57m

Belfast City

Sat 7/25

11:05 am-9:10 am

3 stops28h 05m

$2,250

St. LouisBelfast

STL - BHD

STLBHD

Lambert-St Louis

Mon 7/20

5:58 pm-8:55 pm

3 stops20h 57m

Belfast City

Sat 7/25

11:05 am-9:10 am

3 stops28h 05m

$2,273

St. LouisBelfast

STL - BHD

STLBHD

Lambert-St Louis

Mon 7/20

11:15 am-3:00 pm

2 stops21h 45m

Belfast City

Sat 7/25

4:15 pm-7:30 pm

1 stop33h 15m

$2,756

St. LouisBelfast

STL - BHD

STLBHD

Lambert-St Louis

Mon 7/20

11:15 am-2:50 pm

2 stops21h 35m

Belfast City

Sat 7/25

4:15 pm-7:30 pm

1 stop33h 15m

$2,758

Flights are sorted by cheapest round-trip flights first.

Sorted by cheapest first

See travel insights to Belfast from

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

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

Can stopping save me money on St. Louis to Belfast City Airport flights?

You could potentially save up to 24% on your flight if you consider stops on a St. Louis to Belfast City Airport flight.

When to book flights from St. Louis to Belfast City Airport

Are you open to changing your travel dates? Check out the ideal times to fly from St. Louis to Belfast City Airport according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

Cheap St. Louis to Belfast City Airport (STL to BHD) flight deals and tips

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

Fastest flight time

16h 46m

Direct flights

None
The fastest flight from St. Louis to Belfast City Airport takes 16h 46m
There are no direct flights from St. Louis to Belfast City Airport. There are no popular flight routes from St. Louis to Belfast City Airport.
Search flight deals

Frequently asked questions about flying from St. Louis to Belfast City Airport

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

    A flight from Lambert-St Louis to Belfast City will travel around 3892.8 mi. A reasonable flight in good conditions will take 16h 46m.

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

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

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

    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 City Airport.

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

    The travel and health documents required for your trip to Belfast City Airport 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 City Airport. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

Traveling to a place near Belfast?

Book flights to Belfast if you plan to visit one of these locations
Newcastle
Bangor

Why use momondo?

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

It is quick and easy to find St. Louis to Belfast flights on momondo. We search and return numerous flight options from various airlines and agents. You can then use our filters to narrow your search until you have found the most convenient flight to Belfast that suits you.

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?

momondo helps you find the best flight between St. Louis and Belfast by providing filters to narrow your choice of flights to those matching your criteria. You can select flights based on numerous factors such as price, departure and landing times, airport and airline.

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

If you are simply researching potential flights to Belfast, momondo offers a useful price alert feature which will track prices for flights to Belfast from St. Louis and alert you when they change.

An easier way to manage your Belfast City Airport trip

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