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Northern Ireland

$575+ Cheap flights from St. Louis (STL) to Northern Ireland

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 1/12. Fares are subject to change and may not be available on all flights or dates of travel.
STL — BFS
Jan 3 — Jan 101
Sat 1/3
Sat 1/10
1 adult, Economy
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Cheap flight deals from St. Louis to Northern Ireland

Cheapest flights from St. Louis to Northern Ireland
Explore the most affordable flight options available from St. Louis to Northern Ireland. Find the lowest fares from popular airlines and budget airlines, with prices last updated on December 4, 2025.

This oojo deal was found by Cheapflights users on 12/2. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/312:06 pmSTL - BHD
2 stops14h 09mBritish Airways
Wed 1/79:15 amBHD - STL
2 stops18h 00mBritish Airways
Deal found 12/2$1,011
This American Airlines deal was found by Cheapflights users on 12/2. 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.
Wed 12/314:53 pmSTL - BHD
2 stops17h 42mAmerican Airlines
Wed 1/79:15 amBHD - STL
2 stops18h 00mAmerican Airlines
Deal found 12/2$1,048

Find flight deals from St. Louis to Northern Ireland

Keep the following information in mind while searching for St. Louis to Northern Ireland flight deals. Data was last updated December 4, 2025.

Round-trip from

$575
(oojo)
From Lambert-St Louis to Northern Ireland
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from St. Louis to Northern Ireland 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 December 4, 2025.
Use the filters below to find and compare flights from St. Louis to Northern Ireland that are best for you.

Fly from

St. Louis

Fly to

Northern Ireland

Route

Depart

Return

Price

St. LouisBelfast

STL - BHD

STLBHD

Lambert-St Louis

Mon 1/12

6:44 pm-4:05 pm

2 stops15h 21m

Belfast City

Tue 1/20

6:35 am-6:16 pm

2 stops17h 41m

$575

St. LouisBelfast

STL - BHD

STLBHD

Lambert-St Louis

Wed 2/11

5:04 pm-4:50 pm

2 stops17h 46m

Belfast City

Sun 2/15

5:20 pm-9:06 am

2 stops45h 46m

$711

St. LouisBelfast

STL - BHD

STLBHD

Lambert-St Louis

Wed 2/11

12:11 pm-10:15 am

2 stops16h 04m

Belfast City

Sun 2/15

6:30 am-10:56 pm

2 stops22h 26m

$812

St. LouisBelfast

STL - BHD

STLBHD

Lambert-St Louis

Wed 12/31

2:06 pm-10:15 am

2 stops14h 09m

Belfast City

Wed 1/7

9:15 am-9:15 pm

2 stops18h 00m

$1,011

St. LouisBelfast

STL - BHD

STLBHD

Lambert-St Louis

Wed 12/31

4:53 pm-4:35 pm

2 stops17h 42m

Belfast City

Wed 1/7

9:15 am-9:15 pm

2 stops18h 00m

$1,048

St. LouisBelfast

STL - BFS

STLBFS

Lambert-St Louis

Thu 3/19

4:05 pm-1:40 pm

2 stops16h 35m

Belfast Intl

Tue 3/31

9:25 pm-1:30 pm

2 stops22h 05m

$3,161

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/3

Best time to book a flight from St. Louis to Northern Ireland

Have a flexible travel schedule? Discover the best time to fly to Northern Ireland 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 Northern Ireland

What is the cheapest time of day to fly from STL to NIR?

Find hourly flight availability from St. Louis to Northern Ireland. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated December 4, 2025.

It’s typically best to fly out from St. Louis to Northern Ireland in the morning. Doing so could potentially save you 50% on the flight price compared to flying at noon, which is usually more expensive.

Related info for your journey

Find useful and relevant information for your journey from St. Louis to Northern Ireland. 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 Northern Ireland?

    Located just 12.7 mi from the city center, Lambert-St Louis (STL) is the airport most travelers will use when flying to Northern Ireland from St. Louis.

  • How long is the flight from St. Louis to Northern Ireland?

    British Airways and KLM can get you from St. Louis to Northern Ireland in just under 15h 21m. Your travel time can differ by up to 2h 25m. St. Louis and Northern Ireland are separated by a distance of 3893 mi. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

  • Can I find deals for flights from St. Louis to Northern Ireland that include hotel bookings?

    Yes. In addition to deals on St. Louis to Northern Ireland flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from St. Louis to Northern Ireland?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from St. Louis to Northern Ireland.

  • Can I find deals for business class flights from St. Louis to Northern Ireland?

    Yes. Cheapflights offers flight deals from St. Louis to Northern Ireland 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

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