What is the cheapest month to book a flight from St. Louis to Northern Ireland?

Currently, January is the cheapest month in which you can book a flight from St. Louis to Northern Ireland (average of £67). Flying from St. Louis to Northern Ireland in July is currently the most expensive (average of £90). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

In terms of precipitation, rainfall in Northern Ireland ranges from 50.0 - 90.0 inches per month. October is typically the wettest month, when rainfall can reach 90.0 mm. April is typically the driest time to visit Northern Ireland when rainfall is around 50.0 mm.

If weather is an important factor for your trip to Northern Ireland, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 16.0 C. Travellers hoping to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 5.0 C).

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

When flying from St. Louis to Northern Ireland, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

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.

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 holiday 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.

£678+ Flights from St. Louis to Northern Ireland

Cheap flight deals from St. Louis to Northern Ireland

Round-trip from	£713

Delta
21/7-31/7
4 total stops
39h 20m total
St. Louis to Northern Ireland

Search Deals

Find 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 3 July 2025.

Tue 15/709:15STL - BFS

2 stops25h 25mMultiple Airlines

Mon 21/723:45BFS - STL

2 stops21h 31mMultiple Airlines

Deal found 30/6£678

Tue 15/719:38STL - BHD

2 stops19h 07mBritish Airways

Mon 21/719:30BHD - STL

2 stops30h 54mBritish Airways

Deal found 30/6£683

Mon 21/715:41STL - BHD

2 stops19h 14mDelta

Thu 31/706:30BHD - STL

2 stops20h 06mDelta

Deal found 1/7£713

Tue 15/709:15STL - BHD

2 stops29h 55mMultiple Airlines

Mon 21/707:00BHD - STL

2 stops18h 45mMultiple Airlines

Deal found 1/7£1,032

Mon 14/707:23STL - BHD

3 stops24h 22mAer Lingus

Mon 21/716:55BHD - STL

3 stops32h 13mAer Lingus

Deal found 1/7£2,196

Best flights from St. Louis to Northern Ireland
Discover carefully curated flight deals from St. Louis to Northern Ireland that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 3 July 2025.

Mon 21/715:41STL - BHD

2 stops19h 14mDelta

Thu 31/706:30BHD - STL

2 stops20h 06mDelta

Deal found 1/7£713

Tue 15/720:01STL - BHD

2 stops33h 54mBritish Airways

Mon 21/718:30BHD - STL

2 stops31h 54mBritish Airways

Deal found 1/7£826

Tue 15/716:00STL - BFS

2 stops18h 40mMultiple Airlines

Mon 21/722:00BFS - STL

2 stops27h 45mMultiple Airlines

Deal found 1/7£935

Tue 15/709:15STL - BHD

2 stops29h 55mMultiple Airlines

Mon 21/707:00BHD - STL

2 stops18h 45mMultiple Airlines

Deal found 1/7£1,032

Mon 14/707:23STL - BHD

3 stops24h 22mAer Lingus

Mon 21/716:55BHD - STL

3 stops32h 13mAer Lingus

Deal found 1/7£2,196

Last-minute flights from St. Louis to Northern Ireland
Discover last-minute flight deals from St. Louis to Northern Ireland. Data last updated 3 July 2025 and is based on user searches.

Mon 14/707:23STL - BHD

3 stops24h 22mAer Lingus

Mon 21/716:55BHD - STL

3 stops32h 13mAer Lingus

Deal found 1/7£2,196

Tue 15/709:15STL - BFS

2 stops25h 25mMultiple Airlines

Mon 21/723:45BFS - STL

2 stops21h 31mMultiple Airlines

Deal found 30/6£678

Tue 15/719:38STL - BHD

2 stops19h 07mBritish Airways

Mon 21/719:30BHD - STL

2 stops30h 54mBritish Airways

Deal found 30/6£683

Tue 15/709:15STL - BHD

2 stops29h 55mMultiple Airlines

Mon 21/707:00BHD - STL

2 stops18h 45mMultiple Airlines

Deal found 1/7£1,032

Mon 21/715:41STL - BHD

2 stops19h 14mDelta

Thu 31/706:30BHD - STL

2 stops20h 06mDelta

Deal found 1/7£713

Cheapflights Fare Finder

Use the filters below to find and compare flights from St. Louis to Northern Ireland that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

St. LouisBelfast

STL - BHD

STLBHD

Lambert-St Louis

Mon 21/7

15:41-16:55

2 stops19h 14m

Belfast City

Thu 31/7

06:30-20:36

2 stops20h 06m

£713

St. LouisBelfast

STL - BHD

STLBHD

Lambert-St Louis

Tue 15/7

20:01-11:55

2 stops33h 54m

Belfast City

Mon 21/7

18:30-20:24

2 stops31h 54m

£826

St. LouisBelfast

STL - BFS

STLBFS

Lambert-St Louis

Tue 15/7

16:00-16:40

2 stops18h 40m

Belfast Intl

Mon 21/7

22:00-19:45

2 stops27h 45m

£935

St. LouisBelfast

STL - BHD

STLBHD

Lambert-St Louis

Tue 15/7

09:15-21:10

2 stops29h 55m

Belfast City

Mon 21/7

07:00-19:45

2 stops18h 45m

£1,032

St. LouisBelfast

STL - BHD

STLBHD

Lambert-St Louis

Mon 14/7

07:23-13:45

3 stops24h 22m

Belfast City

Mon 21/7

16:55-19:08

3 stops32h 13m

£2,196

Flights are sorted by cheapest return flights first.

Deals found on 1/7

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 return 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

No data available for this route at this time. Please check back soon.

Reviews of airlines servicing Northern Ireland

See what other customers who have flown with Delta, Aer Lingus, andBritish Airways from St. Louis to Northern Ireland have to say. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.

Delta

8.0

Very Good

7,983 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

Delta

8.0

Very Good

7,983 reviews

Delta

8.0

Very Good

7,983 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

Aer Lingus

7.1

Good

1,144 reviews

Delta

8.0

Very Good

7,983 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

British Airways

6.6

Okay

7,089 reviews

Delta

8.0

Very Good

7,983 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

Related info for your journey

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.
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 holiday 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.
What is the cheapest month to book a flight from St. Louis to Northern Ireland?
Currently, January is the cheapest month in which you can book a flight from St. Louis to Northern Ireland (average of £67). Flying from St. Louis to Northern Ireland in July is currently the most expensive (average of £90). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Browse thousands of different options on Cheapflights for your next trip

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How does Cheapflights help users find flights from St. Louis to Northern Ireland?

When you search for this flight from St. Louis to Northern Ireland, Cheapflights searches on 900+ travel sites to save you time finding great flight deals online. Additionally, we offer filter features so you can choose a preferred cabin class or airline, see different price ranges, and much more so you can book the flight for you.

Why should you use Cheapflights to find cheap flight tickets from St. Louis to Northern Ireland?

Millions of users choose and trust Cheapflights to book the best flight deals from St. Louis to Northern Ireland for free. We help you search and compare prices from hundreds of airlines for the right flight just for you.

Can Cheapflights find flights from St. Louis to Northern Ireland with no change fees?

Certainly. Search results for flights to Northern Ireland from St. Louis shown to you on Cheapflights can be narrowed down with different useful search filters, which includes flexible booking options.

Can Cheapflights notify me if prices for flights from St. Louis to Northern Ireland become cheaper?

Yes, Cheapflights has a feature called Price Alert, which notifies users when flight prices change. Track prices for your flight to Northern Ireland from St. Louis today and book when prices fit your budget.

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Cheap flights from St. Louis to Northern Ireland from £678

This is the cheapest retur flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 15/7. Fares are subject to change and may not be available on all flights or dates of travel.

Cheap 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 3 July 2025.

Round-trip from

Find flight deals from St. Louis to Northern Ireland

Cheapest flights from St. Louis to Northern IrelandExplore 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 3 July 2025.

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 3 July 2025.

Cheapflights Fare Finder

Use the filters below to find and compare flights from St. Louis to Northern Ireland that are best for you.

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.

Cheapflights Insights

Everything you need to know about your flight from St. Louis to Northern Ireland

Reviews of airlines servicing Northern Ireland

See what other customers who have flown with Delta, Aer Lingus, andBritish Airways from St. Louis to Northern Ireland have to say. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.

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?

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

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

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

What is the cheapest month to book a flight from St. Louis to Northern Ireland?

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for St. Louis to Northern Ireland

See prices for flight routes from nearby airports that may be better suited for you.

Fly with Cheapflights

Find the best flight deals on Cheapflights, where travellers can enjoy low prices and a wide availability of flights to their desired destinations.

How does Cheapflights help users find flights from St. Louis to Northern Ireland?

Why should you use Cheapflights to find cheap flight tickets from St. Louis to Northern Ireland?

Can Cheapflights find flights from St. Louis to Northern Ireland with no change fees?

Can Cheapflights notify me if prices for flights from St. Louis to Northern Ireland become cheaper?

100% Free

Book with Flexibility

Travel Smart

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 3 July 2025.