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Cheap flights from St. Louis to Shannon from $559

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 8/17. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
0 bags

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Find the cheapest flights from St. Louis to Shannon

Cheap round-trip flights

Enter your travel dates to find the best prices.
United Airlines Logo
9:16 am - 7:30 am
STL
-
SNN
16h 14m
1 stop
United Airlines Logo
9:30 am - 9:22 pm
SNN
-
STL
17h 52m
1 stop
$559United Airlines
Mon, Aug 17 - Fri, Aug 21
United Airlines Logo
5:00 am - 7:30 am
STL
-
SNN
20h 30m
1 stop
United Airlines Logo
9:30 am - 11:00 pm
SNN
-
STL
19h 30m
1 stop
$560United Airlines
Mon, Aug 17 - Fri, Aug 21
United Airlines Logo
1:18 pm - 7:30 am
STL
-
SNN
12h 12m
1 stop
United Airlines Logo
12:30 pm - 9:22 pm
SNN
-
STL
14h 52m
2 stops
$564United Airlines
Mon, Aug 17 - Fri, Aug 21
United Airlines Logo
11:37 am - 10:15 am
STL
-
SNN
16h 38m
1 stop
United Airlines Logo
12:30 pm - 11:57 pm
SNN
-
STL
17h 27m
1 stop
$597United Airlines
Sun, Apr 5 - Tue, Apr 21
United Airlines Logo
5:32 pm - 7:30 am
STL
-
SNN
31h 58m
1 stop
United Airlines Logo
9:30 am - 3:38 pm
SNN
-
STL
12h 08m
1 stop
$608United Airlines
Sat, Aug 15 - Sun, Aug 23
United Airlines Logo
6:55 pm - 7:30 am
STL
-
SNN
30h 35m
1 stop
United Airlines Logo
9:30 am - 3:38 pm
SNN
-
STL
12h 08m
1 stop
$609United Airlines
Sat, Aug 15 - Sun, Aug 23
United Airlines Logo
9:00 am - 10:15 am
STL
-
SNN
19h 15m
2 stops
United Airlines Logo
9:30 am - 2:25 pm
SNN
-
STL
10h 55m
1 stop
$613United Airlines
Mon, Aug 17 - Mon, Aug 24
United Airlines Logo
1:18 pm - 10:15 am
STL
-
SNN
14h 57m
2 stops
United Airlines Logo
12:30 pm - 9:22 pm
SNN
-
STL
14h 52m
2 stops
$643United Airlines
Mon, Aug 17 - Fri, Aug 21
United Airlines Logo
6:00 am - 10:15 am
STL
-
SNN
22h 15m
2 stops
United Airlines Logo
9:30 am - 11:00 pm
SNN
-
STL
19h 30m
1 stop
$663United Airlines
Sat, Aug 15 - Sun, Aug 23
Air Canada Logo
6:15 am - 10:15 am
STL
-
SNN
22h 00m
1 stop
Air Canada Logo
12:30 pm - 11:57 pm
SNN
-
STL
17h 27m
1 stop
$706Air Canada
Mon, Apr 20 - Mon, Apr 27

British Airways flights from St. Louis to Shannon, Clare

Our best British Airways deals on St. Louis to Shannon, Clare flight tickets
British Airways
Aug 15
STL4:18 pmLambert-St Louis
22h 17m
2 stops
SNN8:35 pmShannon
Aug 23
SNN9:15 pmShannon
28h 08m
2 stops
STL7:23 pmLambert-St Louis
$795
British Airways
Aug 15
STL9:45 amLambert-St Louis
48h 25m
2 stops
SNN4:10 pmShannon
Aug 23
SNN9:15 pmShannon
24h 33m
2 stops
STL3:48 pmLambert-St Louis
$851
British Airways
Mar 25
STL6:57 pmLambert-St Louis
16h 48m
2 stops
SNN4:45 pmShannon
Apr 4
SNN7:30 amShannon
21h 28m
2 stops
STL10:58 pmLambert-St Louis
$896

United Airlines flights from St. Louis to Shannon, Clare

Our best United Airlines deals on St. Louis to Shannon, Clare flight tickets
United Airlines
Aug 17
STL9:16 amLambert-St Louis
16h 14m
1 stop
SNN7:30 amShannon
Aug 21
SNN9:30 amShannon
17h 52m
1 stop
STL9:22 pmLambert-St Louis
$559
United Airlines
Aug 17
STL5:00 amLambert-St Louis
20h 30m
1 stop
SNN7:30 amShannon
Aug 21
SNN9:30 amShannon
19h 30m
1 stop
STL11:00 pmLambert-St Louis
$560
United Airlines
Aug 17
STL1:18 pmLambert-St Louis
12h 12m
1 stop
SNN7:30 amShannon
Aug 21
SNN12:30 pmShannon
14h 52m
2 stops
STL9:22 pmLambert-St Louis
$564

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 March 8, 2026.
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

Cheapest round-trip

St. LouisShannon

STL - SNN

STLSNN

Lambert-St Louis

Mon 8/17

9:16 am-7:30 am

1 stop16h 14m

Shannon

Fri 8/21

9:30 am-9:22 pm

1 stop17h 52m

$559

St. LouisShannon

STL - SNN

STLSNN

Lambert-St Louis

Mon 8/17

5:00 am-7:30 am

1 stop20h 30m

Shannon

Fri 8/21

9:30 am-11:00 pm

1 stop19h 30m

$560
Quickest round-trip

St. LouisShannon

STL - SNN

STLSNN

Lambert-St Louis

Mon 8/17

1:18 pm-7:30 am

1 stop12h 12m

Shannon

Fri 8/21

12:30 pm-9:22 pm

2 stops14h 52m

$564

St. LouisShannon

STL - SNN

STLSNN

Lambert-St Louis

Sun 4/5

11:37 am-10:15 am

1 stop16h 38m

Shannon

Tue 4/21

12:30 pm-11:57 pm

1 stop17h 27m

$597

St. LouisShannon

STL - SNN

STLSNN

Lambert-St Louis

Sat 8/15

5:32 pm-7:30 am

1 stop31h 58m

Shannon

Sun 8/23

9:30 am-3:38 pm

1 stop12h 08m

$608

St. LouisShannon

STL - SNN

STLSNN

Lambert-St Louis

Sat 8/15

6:55 pm-7:30 am

1 stop30h 35m

Shannon

Sun 8/23

9:30 am-3:38 pm

1 stop12h 08m

$609

St. LouisShannon

STL - SNN

STLSNN

Lambert-St Louis

Mon 8/17

9:00 am-10:15 am

2 stops19h 15m

Shannon

Mon 8/24

9:30 am-2:25 pm

1 stop10h 55m

$613

St. LouisShannon

STL - SNN

STLSNN

Lambert-St Louis

Mon 8/17

1:18 pm-10:15 am

2 stops14h 57m

Shannon

Fri 8/21

12:30 pm-9:22 pm

2 stops14h 52m

$643

St. LouisShannon

STL - SNN

STLSNN

Lambert-St Louis

Sat 8/15

6:00 am-10:15 am

2 stops22h 15m

Shannon

Sun 8/23

9:30 am-11:00 pm

1 stop19h 30m

$663

St. LouisShannon

STL - SNN

STLSNN

Lambert-St Louis

Mon 4/20

6:15 am-10:15 am

1 stop22h 00m

Shannon

Mon 4/27

12:30 pm-11:57 pm

1 stop17h 27m

$706

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 15 resultsSorted by cheapest first
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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

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

You could potentially save up to 53% 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

Fastest flight time

16h 07m

Direct flights

None
The fastest flight from St. Louis to Shannon, Clare takes 16h 07m
There are no direct flights from St. Louis to Shannon, Clare. There are no popular flight routes from St. Louis to Shannon, Clare.
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 16h 07m.

  • 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 $483Free CancellationRating
7.1
11,397 reviews
Search American Airlines flights
United AirlinesPriceFrom $546Free CancellationRating
7.4
9,405 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
Bunratty
Ennis
Adare
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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