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Cheap flights from St. Louis to Ireland from $304

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 Ireland departing on 9/25. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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0 bags

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Find the cheapest flights from St. Louis to Ireland

Cheap round-trip flights

United Airlines Logo
6:45 am - 7:30 amSTL-DUB
18h 45m2 stops
United Airlines Logo
9:00 am - 4:40 pmDUB-STL
37h 40m2 stops
$509United Airlines
Find Deal
Wed, Feb 11 - Wed, Feb 18
Air Canada Logo
3:15 pm - 7:10 amSTL-DUB
33h 55m2 stops
Air Canada Logo
9:00 am - 2:18 pmDUB-STL
35h 18m2 stops
$511Air Canada
Find Deal
Mon, Feb 9 - Wed, Feb 18
United Airlines Logo
8:00 am - 8:10 amSTL-DUB
18h 10m1 stop
United Airlines Logo
9:00 am - 3:29 pmDUB-STL
12h 29m1 stop
$517United Airlines
Find Deal
Sun, Feb 8 - Fri, Feb 20
Air Canada Logo
1:27 pm - 7:10 amSTL-DUB
35h 43m2 stops
Air Canada Logo
9:00 am - 3:29 pmDUB-STL
12h 29m1 stop
$524Air Canada
Find Deal
Mon, Feb 9 - Wed, Feb 18
American Airlines Logo
6:21 pm - 1:35 pmSTL-DUB
13h 14m2 stops
American Airlines Logo
11:30 am - 8:23 pmDUB-STL
14h 53m1 stop
$530American Airlines
Find Deal
Wed, Jan 14 - Tue, Jan 20
American Airlines Logo
6:21 pm - 1:35 pmSTL-DUB
13h 14m2 stops
American Airlines Logo
11:30 am - 7:07 pmDUB-STL
13h 37m2 stops
$535American Airlines
Find Deal
Wed, Jan 14 - Tue, Jan 20
Iberia Logo
2:40 pm - 8:55 amSTL-DUB
36h 15m2 stops
Iberia Logo
9:40 am - 8:18 pmDUB-STL
40h 38m2 stops
$570Iberia
Find Deal
Sun, Feb 8 - Thu, Feb 19
Lufthansa Logo
3:50 pm - 11:00 amSTL-DUB
13h 10m1 stop
Lufthansa Logo
5:10 am - 1:55 pmDUB-STL
14h 45m1 stop
$588Lufthansa
Find Deal
Wed, Nov 5 - Sun, Nov 9
Iberia Logo
2:40 pm - 8:55 amSTL-DUB
36h 15m2 stops
Iberia Logo
11:30 am - 8:18 pmDUB-STL
14h 48m1 stop
$604Iberia
Find Deal
Sun, Feb 8 - Sat, Feb 21
Lufthansa Logo
11:39 am - 10:15 amSTL-SNN
16h 36m1 stop
Lufthansa Logo
12:30 pm - 11:44 pmSNN-STL
17h 14m1 stop
$993Lufthansa
Find Deal
Thu, Oct 2 - Thu, Oct 9

United Airlines flights from St. Louis to Ireland

Our best United Airlines deals on St. Louis to Ireland flight tickets
United Airlines
Feb 11
STL6:45 amLambert-St Louis
18h 45m
2 stops
DUB7:30 amDublin
Feb 18
DUB9:00 amDublin
37h 40m
2 stops
STL4:40 pmLambert-St Louis
$509
Find similar
United Airlines
Feb 8
STL8:00 amLambert-St Louis
18h 10m
1 stop
DUB8:10 amDublin
Feb 20
DUB9:00 amDublin
12h 29m
1 stop
STL3:29 pmLambert-St Louis
$517
Find similar
United Airlines
Feb 8
STL10:30 amLambert-St Louis
15h 00m
2 stops
DUB7:30 amDublin
Feb 20
DUB9:00 amDublin
12h 29m
1 stop
STL3:29 pmLambert-St Louis
$522
Find similar

Air Canada flights from St. Louis to Ireland

Our best Air Canada deals on St. Louis to Ireland flight tickets
Air Canada
Feb 9
STL3:15 pmLambert-St Louis
33h 55m
2 stops
DUB7:10 amDublin
Feb 18
DUB9:00 amDublin
35h 18m
2 stops
STL2:18 pmLambert-St Louis
$511
Find similar
Air Canada
Feb 9
STL1:27 pmLambert-St Louis
35h 43m
2 stops
DUB7:10 amDublin
Feb 18
DUB9:00 amDublin
12h 29m
1 stop
STL3:29 pmLambert-St Louis
$524
Find similar
Air Canada
Feb 12
STL6:45 amLambert-St Louis
18h 25m
2 stops
DUB7:10 amDublin
Feb 18
DUB9:00 amDublin
35h 18m
2 stops
STL2:18 pmLambert-St Louis
$561
Find similar

momondo Fare Finder

 
Customize your flight search to find flights from St. Louis to 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, momondo users made 832,500 searches. Data last updated August 20, 2025.
Use the filters below to find and compare flights from St. Louis to Ireland that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

St. LouisDublin

STL - DUB

STLDUB

Lambert-St Louis

Wed 2/11

6:45 am-7:30 am

2 stops18h 45m

Dublin

Wed 2/18

9:00 am-4:40 pm

2 stops37h 40m

$509

St. LouisDublin

STL - DUB

STLDUB

Lambert-St Louis

Mon 2/9

3:15 pm-7:10 am

2 stops33h 55m

Dublin

Wed 2/18

9:00 am-2:18 pm

2 stops35h 18m

$511

St. LouisDublin

STL - DUB

STLDUB

Lambert-St Louis

Sun 2/8

8:00 am-8:10 am

1 stop18h 10m

Dublin

Fri 2/20

9:00 am-3:29 pm

1 stop12h 29m

$517

St. LouisDublin

STL - DUB

STLDUB

Lambert-St Louis

Mon 2/9

1:27 pm-7:10 am

2 stops35h 43m

Dublin

Wed 2/18

9:00 am-3:29 pm

1 stop12h 29m

$524

St. LouisDublin

STL - DUB

STLDUB

Lambert-St Louis

Wed 1/14

6:21 pm-1:35 pm

2 stops13h 14m

Dublin

Tue 1/20

11:30 am-8:23 pm

1 stop14h 53m

$530

St. LouisDublin

STL - DUB

STLDUB

Lambert-St Louis

Wed 1/14

6:21 pm-1:35 pm

2 stops13h 14m

Dublin

Tue 1/20

11:30 am-7:07 pm

2 stops13h 37m

$535

St. LouisDublin

STL - DUB

STLDUB

Lambert-St Louis

Sun 2/8

2:40 pm-8:55 am

2 stops36h 15m

Dublin

Thu 2/19

9:40 am-8:18 pm

2 stops40h 38m

$570

St. LouisDublin

STL - DUB

STLDUB

Lambert-St Louis

Wed 11/5

3:50 pm-11:00 am

1 stop13h 10m

Dublin

Sun 11/9

5:10 am-1:55 pm

1 stop14h 45m

$588

St. LouisDublin

STL - DUB

STLDUB

Lambert-St Louis

Sun 2/8

2:40 pm-8:55 am

2 stops36h 15m

Dublin

Sat 2/21

11:30 am-8:18 pm

1 stop14h 48m

$604

St. LouisShannon

STL - SNN

STLSNN

Lambert-St Louis

Thu 10/2

11:39 am-10:15 am

1 stop16h 36m

Shannon

Thu 10/9

12:30 pm-11:44 pm

1 stop17h 14m

$993

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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See travel insights to Ireland from

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

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 month to fly to Ireland?

In general, February is the cheapest month to fly from St. Louis to Ireland. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $698. If you aren’t able to travel to Ireland during the month of February, then flying in November is also cheap. Prices for this month can be found on momondo for an average of $708.

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

The cheapest day to depart on your flight to Ireland is on a Wednesday when prices can be found for as low as $865. This is often the case because there is less demand to fly during this day of the week. Flights from St. Louis to Ireland on a Saturday will generally be more expensive and average around $972. Keep in mind that these prices on both days could fluctuate depending on the season and the demand.

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

According to our data, the cheapest time of day to fly to Ireland is in the evening. momondo users have found flights departing from St. Louis to Ireland in the evening for as low as $556. Keep in mind that these prices may fluctuate based on what airline you choose and the time of year you plan to travel. In contrast, the most expensive time of day to depart to Ireland is at noon when prices are around $1,057.

How far in advance should I book a flight to Ireland?

You are more likely to see cheaper flights to Ireland from St. Louis when booking weeks ahead of your departure date. In general, you can expect to find flights to Ireland for around $882 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Ireland from St. Louis for as low as $634 on momondo.

Can stopping save me money on St. Louis to Ireland flights?

You could potentially save up to 15% on your flight if you consider stops on a St. Louis to Ireland flight.

Cheap St. Louis to Ireland flight deals and tips

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

Direct flights

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

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

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

  • How many operators does momondo search for flights from Lambert-St Louis Airport to Ireland?

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

    Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Lambert-St Louis Airport to Ireland.

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

    The travel and health documents required for your trip to Ireland 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 Ireland. 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 Ireland

Compare and see reviews for airlines that fly from St. Louis to Ireland with momondo
Airline
Rating
Free Cancellation
Price
British AirwaysPriceFrom $383Free CancellationRating
6.7
7,289 reviews
Search British Airways flights
KLMPriceFrom $412Free CancellationRating
7.8
1,388 reviews
Search KLM flights
Air CanadaPriceFrom $462Free CancellationRating
7.1
10,000 reviews
Search Air Canada flights
IberiaPriceFrom $482Free CancellationRating
7.0
2,887 reviews
Search Iberia flights
United AirlinesPriceFrom $490Free CancellationRating
7.4
8,928 reviews
Search United Airlines flights
American AirlinesPriceFrom $518Free CancellationRating
7.2
10,000 reviews
Search American Airlines flights
DeltaPriceFrom $536Free CancellationRating
7.9
7,982 reviews
Search Delta flights
LufthansaPriceFrom $627Free CancellationRating
6.8
7,337 reviews
Search Lufthansa flights
Aer LingusPriceFrom $736Free CancellationRating
7.2
1,225 reviews
Search Aer Lingus flights

Why use momondo?

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

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

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

Yes. momondo allows you to filter the results for St. Louis to Ireland flights to just show those with flexible booking policies.

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

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

Price alerts on flights to Ireland from St. Louis are quick and easy to set up on momondo. Simply perform a search and select the price alert feature. It is as simple as that.

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Find better results for your trip to Ireland

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