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Cheap flights from St. Louis to Shannon from $547

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 Shannon departing on 9/15. 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 Shannon

Cheap round-trip flights

United Airlines Logo
3:20 pm - 7:30 amSTL-SNN
10h 10m1 stop
United Airlines Logo
9:30 am - 10:35 pmSNN-STL
19h 05m1 stop
$547United Airlines
Find Deal
Mon, Sep 15 - Wed, Sep 24
United Airlines Logo
9:17 am - 7:30 amSTL-SNN
16h 13m1 stop
United Airlines Logo
12:30 pm - 10:35 pmSNN-STL
16h 05m2 stops
$551United Airlines
Find Deal
Mon, Sep 15 - Wed, Sep 24
American Airlines Logo
2:11 pm - 11:20 amSTL-SNN
15h 09m2 stops
American Airlines Logo
7:40 am - 6:32 pmSNN-STL
16h 52m2 stops
$559American Airlines
Find Deal
Mon, Sep 15 - Wed, Sep 24
United Airlines Logo
5:24 pm - 10:15 amSTL-SNN
10h 51m1 stop
United Airlines Logo
12:30 pm - 4:32 pmSNN-STL
34h 02m2 stops
$663United Airlines
Find Deal
Tue, Sep 30 - Wed, Oct 8
Logo
1:30 pm - 4:10 pmSTL-SNN
20h 40m2 stops
Logo
7:40 am - 10:35 pmSNN-STL
20h 55m3 stops
$761
Find Deal
Mon, Sep 15 - Wed, Sep 24
Aer Lingus Logo
6:00 am - 11:20 amSTL-SNN
23h 20m2 stops
Aer Lingus Logo
5:30 pm - 8:25 pmSNN-STL
32h 55m2 stops
$1,177Aer Lingus
Find Deal
Mon, Sep 15 - Sat, Sep 20
United Airlines Logo
9:17 am - 7:30 amSTL-SNN
16h 13m1 stop
United Airlines Logo
9:30 am - 2:19 pmSNN-STL
10h 49m1 stop
$1,356United Airlines
Find Deal
Mon, Sep 15 - Sat, Sep 20
KLM Logo
4:10 pm - 11:10 amSTL-SNN
13h 00m1 stop
KLM Logo
1:05 pm - 10:00 pmSNN-STL
14h 55m2 stops
$1,360KLM
Find Deal
Mon, Sep 15 - Sat, Sep 20
Logo
5:24 pm - 10:15 amSTL-SNN
10h 51m1 stop
Logo
12:30 pm - 11:57 pmSNN-STL
17h 27m1 stop
$1,590
Find Deal
Tue, Sep 30 - Wed, Oct 8
Logo
7:04 pm - 8:35 pmSTL-SNN
19h 31m3 stops
Logo
2:20 pm - 7:38 pmSNN-STL
35h 18m3 stops
$2,775
Find Deal
Mon, Sep 15 - Wed, Sep 24

United Airlines flights from St. Louis to Shannon, Clare

Our best United Airlines deals on St. Louis to Shannon, Clare flight tickets
United Airlines
Sep 15
STL3:20 pmLambert-St Louis
10h 10m
1 stop
SNN7:30 amShannon
Sep 24
SNN9:30 amShannon
19h 05m
1 stop
STL10:35 pmLambert-St Louis
$547
Find similar
United Airlines
Sep 15
STL9:17 amLambert-St Louis
16h 13m
1 stop
SNN7:30 amShannon
Sep 24
SNN12:30 pmShannon
16h 05m
2 stops
STL10:35 pmLambert-St Louis
$551
Find similar
United Airlines
Sep 30
STL5:24 pmLambert-St Louis
10h 51m
1 stop
SNN10:15 amShannon
Oct 8
SNN12:30 pmShannon
34h 02m
2 stops
STL4:32 pmLambert-St Louis
$663
Find similar

momondo Fare Finder

 
Customize your flight search to find flights from St. Louis to Shannon, Clare 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 2, 2025.
Use the filters below to find and compare flights from St. Louis to Shannon, Clare that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

St. LouisShannon

STL - SNN

STLSNN

Lambert-St Louis

Mon 9/15

3:20 pm-7:30 am

1 stop10h 10m

Shannon

Wed 9/24

9:30 am-10:35 pm

1 stop19h 05m

$547

St. LouisShannon

STL - SNN

STLSNN

Lambert-St Louis

Mon 9/15

9:17 am-7:30 am

1 stop16h 13m

Shannon

Wed 9/24

12:30 pm-10:35 pm

2 stops16h 05m

$551

St. LouisShannon

STL - SNN

STLSNN

Lambert-St Louis

Mon 9/15

2:11 pm-11:20 am

2 stops15h 09m

Shannon

Wed 9/24

7:40 am-6:32 pm

2 stops16h 52m

$559

St. LouisShannon

STL - SNN

STLSNN

Lambert-St Louis

Tue 9/30

5:24 pm-10:15 am

1 stop10h 51m

Shannon

Wed 10/8

12:30 pm-4:32 pm

2 stops34h 02m

$663

St. LouisShannon

STL - SNN

STLSNN

Lambert-St Louis

Mon 9/15

1:30 pm-4:10 pm

2 stops20h 40m

Shannon

Wed 9/24

7:40 am-10:35 pm

3 stops20h 55m

$761

St. LouisShannon

STL - SNN

STLSNN

Lambert-St Louis

Mon 9/15

6:00 am-11:20 am

2 stops23h 20m

Shannon

Sat 9/20

5:30 pm-8:25 pm

2 stops32h 55m

$1,177

St. LouisShannon

STL - SNN

STLSNN

Lambert-St Louis

Mon 9/15

9:17 am-7:30 am

1 stop16h 13m

Shannon

Sat 9/20

9:30 am-2:19 pm

1 stop10h 49m

$1,356

St. LouisShannon

STL - SNN

STLSNN

Lambert-St Louis

Mon 9/15

4:10 pm-11:10 am

1 stop13h 00m

Shannon

Sat 9/20

1:05 pm-10:00 pm

2 stops14h 55m

$1,360

St. LouisShannon

STL - SNN

STLSNN

Lambert-St Louis

Tue 9/30

5:24 pm-10:15 am

1 stop10h 51m

Shannon

Wed 10/8

12:30 pm-11:57 pm

1 stop17h 27m

$1,590

St. LouisShannon

STL - SNN

STLSNN

Lambert-St Louis

Mon 9/15

7:04 pm-8:35 pm

3 stops19h 31m

Shannon

Wed 9/24

2:20 pm-7:38 pm

3 stops35h 18m

$2,775

Flights are sorted by cheapest round-trip flights first.

Sorted by cheapest first

See travel insights to Shannon from

How to get the cheapest flight ticket from St. Louis to Shannon, Clare

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 Shannon, Clare?

In general, December is the cheapest month to fly from St. Louis to Shannon, Clare. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $515. If you are unable to visit Shannon, Clare during the month of December, then departing from St. Louis during the month November is also very affordable. Most momondo users find prices during this month for around $518.

What is the cheapest day to depart on your flight to Shannon, Clare?

The cheapest day to depart from St. Louis to Shannon, Clare is on a Tuesday when prices can be found for as low as $718. The most expensive day to fly to Shannon, Clare is Saturday, with ticket prices averaging around $1,188.

What is the cheapest time of day to depart on your flight to Shannon, Clare?

Our data shows that the cheapest St. Louis to Shannon, Clare flights are usually those with departure times at noon. Our users have found flights to Shannon, Clare at noon for as low as $972. Flights in the morning are often more expensive with an average ticket price of $1,098.

Can stopping save me money on St. Louis to Shannon, Clare flights?

You could potentially save up to 9% on your flight if you consider stops on a St. Louis to Shannon, Clare flight.

When to book flights from St. Louis to Shannon, Clare

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

Cheap St. Louis to Shannon, Clare (STL to SNN) flight deals and tips

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

Best Price Found

$547

Fastest flight time

10h 10m

Direct flights

None

Airports in Shannon, Clare

1 airport
The best flight deal from St. Louis to Shannon, Clare found on momondo in the last 72 hours is $547
The fastest flight from St. Louis to Shannon, Clare takes 10h 10m
There are no direct flights from St. Louis to Shannon, Clare. Popular non-direct route for this connection is Lambert-St Louis Airport - Shannon Airport.
There is 1 airport near Shannon, Clare: Shannon (SNN)
Search flight deals

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

    The straight-line distance from Lambert-St Louis to Shannon is 3824.7 mi. By plane, this route typically takes 10h 10m.

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

    Prices for flights from Lambert-St Louis Airport to Shannon Airport are updated daily.

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

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

    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 Shannon Airport.

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

    The travel and health documents you'll need for your trip to Shannon Airport may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at Shannon Airport. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

  • What is the most popular airline from St. Louis to Shannon, Clare?

Best airlines flying from St. Louis to Shannon, Clare

Compare and see reviews for airlines that fly from St. Louis to Shannon, Clare with momondo
Airline
Rating
Free Cancellation
Price
American AirlinesPriceFrom $518Free CancellationRating
7.2
10,000 reviews
Search American Airlines flights
United AirlinesPriceFrom $671Free CancellationRating
7.4
8,904 reviews
Search United Airlines flights

Traveling to a place near Shannon?

Book flights to Shannon if you plan to visit one of these locations
Limerick
Adare
Ennis
Bunratty
Lahinch
Nenagh

Why use momondo?

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

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

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

Yes. All flights to Shannon 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 Shannon?

Once you have performed a search in the form on the page, momondo provides useful filters and insights. We can show you the cheapest days and times to fly as well as help filter your options to help you make an informed choice when booking flights to Shannon from St. Louis.

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

Yes momondo offers price alerts on flights to Shannon from St. Louis. After performing a search on this page you should be able to see the price alert set up feature. Simply provide a valid email address and momondo will instantly alert you when prices change.

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