How do I get Price Alerts for flights from St. Louis to Northern Ireland?

You can take advantage of momondo’s Price Alerts by first searching for your flights to St. Louis from Northern Ireland . Flight offers will be shown to you in real-time. From there you can create a Price Alert by using our on-site widget.

How can I save money on flights from St. Louis to Northern Ireland with momondo?

Leverage our AI within our “Price Forecast” tool, which predicts if it’s better to book now or wait until prices decrease. You can strategically pick the best days to fly and save money on your trip by using our “Price Calendar” tool. “Explore” shows an overview of how much it costs to fly to anywhere from a selected city or airport. Our “Discover” content is a great option for travel inspiration and money-saving tips, while “Price Alerts” will update you when prices change, so you can book when fares are right.

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.

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

Prices for flights from Lambert-St Louis Airport to Northern Ireland were last updated today.

How old do you have to be to fly from Lambert-St Louis Airport to Northern Ireland?

The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from Lambert-St Louis Airport to Northern Ireland.

What documentation or ID do you need to fly to Northern Ireland?

The required travel and health documents for your Northern Ireland trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at Northern Ireland. We recommend that you seek guidance from your airline or a reliable third party such as IATA.

$924 Cheap Flights from St. Louis to Northern Ireland in 2026

1 adult

0 bags

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Find the cheapest flights from St. Louis to Northern Ireland

Round-trip

Cheap round-trip flights

Enter your travel dates to find the best prices.

8:40 am - 7:50 pm

STL

BFS

29h 10m

2 stops

9:05 pm - 12:21 pm

BFS

STL

45h 16m

3 stops

$1,115Multiple Airlines

Tue, Jun 9 - Fri, Jun 19

1:05 pm - 7:50 pm

STL

BFS

24h 45m

3 stops

9:05 pm - 12:21 pm

BFS

STL

45h 16m

3 stops

$1,129Multiple Airlines

Tue, Jun 9 - Fri, Jun 19

6:13 pm - 6:10 pm

STL

BHD

17h 57m

2 stops

9:35 am - 12:16 am

BHD

STL

20h 41m

2 stops

$1,285American Airlines

Fri, Jun 12 - Fri, Jun 19

7:22 am - 8:45 pm

STL

BFS

31h 23m

3 stops

9:05 pm - 12:21 pm

BFS

STL

45h 16m

3 stops

$1,298Multiple Airlines

Fri, Jun 12 - Fri, Jun 19

6:13 pm - 6:10 pm

STL

BHD

17h 57m

2 stops

6:30 am - 7:30 pm

BHD

STL

19h 00m

1 stop

$1,425American Airlines

Fri, Jun 12 - Fri, Jun 19

2:15 pm - 8:45 pm

STL

BFS

24h 30m

2 stops

9:05 pm - 12:21 pm

BFS

STL

45h 16m

3 stops

$1,439Multiple Airlines

Fri, Jun 12 - Fri, Jun 19

2:15 pm - 9:30 pm

STL

BFS

25h 15m

2 stops

6:45 am - 2:02 pm

BFS

STL

37h 17m

3 stops

$1,447Multiple Airlines

Sun, Jun 28 - Sun, Jul 5

1:20 pm - 9:30 pm

STL

BFS

26h 10m

3 stops

6:45 am - 2:02 pm

BFS

STL

37h 17m

3 stops

$1,449Multiple Airlines

Sun, Jun 28 - Sun, Jul 5

9:35 pm - 6:10 pm

STL

BHD

14h 35m

1 stop

6:30 am - 7:30 pm

BHD

STL

19h 00m

1 stop

$1,714American Airlines

Fri, Jun 12 - Fri, Jun 19

4:29 pm - 3:40 pm

STL

BHD

17h 11m

2 stops

6:30 am - 6:02 pm

BHD

STL

17h 32m

2 stops

$7,046British Airways

Wed, Sep 9 - Wed, Sep 16

American Airlines flights from St. Louis to Northern Ireland

Our best American Airlines deals on St. Louis to Northern Ireland 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

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 - 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 - BFS

STLBFS

Lambert-St Louis

Fri 6/12

2:15 pm-8:45 pm

2 stops24h 30m

Belfast Intl

Fri 6/19

9:05 pm-12:21 pm

3 stops45h 16m

$1,439

St. LouisBelfast

STL - BFS

STLBFS

Lambert-St Louis

Sun 6/28

2:15 pm-9:30 pm

2 stops25h 15m

Belfast Intl

Sun 7/5

6:45 am-2:02 pm

3 stops37h 17m

$1,447

St. LouisBelfast

STL - BFS

STLBFS

Lambert-St Louis

Sun 6/28

1:20 pm-9:30 pm

3 stops26h 10m

Belfast Intl

Sun 7/5

6:45 am-2:02 pm

3 stops37h 17m

$1,449

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 Northern Ireland flight deals and tips

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

Fastest flight time	16h 52m
Direct flights	None

The fastest flight from St. Louis to Northern Ireland takes 16h 52m

There are no direct flights from St. Louis to Northern Ireland. There are no popular flight routes from St. Louis to Northern Ireland.

Search flight deals

Frequently asked questions about flying from St. Louis to Northern Ireland

When did momondo last update prices for flights from Lambert-St Louis Airport to Northern Ireland?
Prices for flights from Lambert-St Louis Airport to Northern Ireland were last updated today.
How old do you have to be to fly from Lambert-St Louis Airport to Northern Ireland?
The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from Lambert-St Louis Airport to Northern Ireland.
What documentation or ID do you need to fly to Northern Ireland?
The required travel and health documents for your Northern Ireland trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at Northern Ireland. We recommend that you seek guidance from your airline or a reliable third party such as IATA.

Frequently asked questions about flying from St. Louis to Northern Ireland

How do I get Price Alerts for flights from St. Louis to Northern Ireland?
You can take advantage of momondo’s Price Alerts by first searching for your flights to St. Louis from Northern Ireland. Flight offers will be shown to you in real-time. From there you can create a Price Alert by using our on-site widget.
How can I save money on flights from St. Louis to Northern Ireland with momondo?
Leverage our AI within our “Price Forecast” tool, which predicts if it’s better to book now or wait until prices decrease. You can strategically pick the best days to fly and save money on your trip by using our “Price Calendar” tool. “Explore” shows an overview of how much it costs to fly to anywhere from a selected city or airport. Our “Discover” content is a great option for travel inspiration and money-saving tips, while “Price Alerts” will update you when prices change, so you can book when fares are right.
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 Northern Ireland?

momondo collates all your flight options in one place and lets you filter them to find the perfect flight from St. Louis to Northern Ireland. momondo saves you time and could save you money on your trip.

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

Yes. All flights to Northern Ireland from St. Louis on momondo can be compared and filtered by various policies on offer, including flexible booking.

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

momondo offers useful filters to help you find the right flight. Choose specific flight times, airports or even what payment method you prefer. We have numerous options to help you book your ideal flight from St. Louis to Northern Ireland.

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

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