$413 Cheap Flights from St. Louis (STL) to Shannon (SNN)

View $413 flight on Sun, Aug 2, 2026Opens in a new window

Popular airlines from St. Louis Lambert Intl. Airport (STL) to Shannon Airport (SNN)

Cheap Flights from St. Louis to Shannon (STL-SNN)

Prices were available within the past 7 days and start at $413 for one-way flights and $506 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

United
Sun, Apr 5 - Tue, Apr 21
STL
St. Louis
SNN
Shannon
$506 Roundtrip, found 7 hours ago
$506
Roundtrip
found 7 hours ago
Select United flight, departing Sun, Apr 5 from St. Louis to Shannon, returning Tue, Apr 21, priced at $506 found 7 hours ago
United
Mon, Apr 13 - Fri, Apr 24
STL
St. Louis
SNN
Shannon
$511 Roundtrip, found 4 days ago
$511
Roundtrip
found 4 days ago
Select United flight, departing Mon, Apr 13 from St. Louis to Shannon, returning Fri, Apr 24, priced at $511 found 4 days ago
United
Sun, Apr 5 - Mon, Apr 20
STL
St. Louis
SNN
Shannon
$556 Roundtrip, found 7 hours ago
$556
Roundtrip
found 7 hours ago
Select United flight, departing Sun, Apr 5 from St. Louis to Shannon, returning Mon, Apr 20, priced at $556 found 7 hours ago
United
Fri, Apr 3 - Tue, Apr 14
STL
St. Louis
SNN
Shannon
$561 Roundtrip, found 7 hours ago
$561
Roundtrip
found 7 hours ago
Select United flight, departing Fri, Apr 3 from St. Louis to Shannon, returning Tue, Apr 14, priced at $561 found 7 hours ago
United
Sun, Apr 26 - Fri, May 15
STL
St. Louis
SNN
Shannon
$576 Roundtrip, found 7 hours ago
$576
Roundtrip
found 7 hours ago
Select United flight, departing Sun, Apr 26 from St. Louis to Shannon, returning Fri, May 15, priced at $576 found 7 hours ago
United
Fri, Apr 17 - Tue, Apr 28
STL
St. Louis
SNN
Shannon
$579 Roundtrip, found 7 hours ago
$579
Roundtrip
found 7 hours ago
Select United flight, departing Fri, Apr 17 from St. Louis to Shannon, returning Tue, Apr 28, priced at $579 found 7 hours ago
Lufthansa
Tue, Apr 21 - Tue, May 5
STL
St. Louis
SNN
Shannon
$700 Roundtrip, found 16 hours ago
$700
Roundtrip
found 16 hours ago
Select Lufthansa flight, departing Tue, Apr 21 from St. Louis to Shannon, returning Tue, May 5, priced at $700 found 16 hours ago
American Airlines
Sun, Mar 1 - Tue, Mar 17
STL
St. Louis
SNN
Shannon
$708 Roundtrip, found 7 hours ago
$708
Roundtrip
found 7 hours ago
Select American Airlines flight, departing Sun, Mar 1 from St. Louis to Shannon, returning Tue, Mar 17, priced at $708 found 7 hours ago
Air Canada
Tue, Apr 21 - Tue, May 5
STL
St. Louis
SNN
Shannon
$710 Roundtrip, found 16 hours ago
$710
Roundtrip
found 16 hours ago
Select Air Canada flight, departing Tue, Apr 21 from St. Louis to Shannon, returning Tue, May 5, priced at $710 found 16 hours ago
British Airways
Wed, Nov 12 - Tue, Nov 18
STL
St. Louis
SNN
Shannon
$721 Roundtrip, found 13 hours ago
$721
Roundtrip
found 13 hours ago
Select British Airways flight, departing Wed, Nov 12 from St. Louis to Shannon, returning Tue, Nov 18, priced at $721 found 13 hours ago

Frequently asked questions

How much does a flight from Lambert-St. Louis Intl. Airport (STL) to Shannon Airport (SNN) cost?
Grab a cheap one-way flight from $413 or cheap return flight from $506 from Lambert-St. Louis Intl. Airport (STL) to Shannon Airport (SNN) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to find our cheapest flight deals on this route.
What is the cheapest month to fly from Lambert-St. Louis Intl. Airport (STL) to Shannon Airport (SNN)?
April is the most affordable month to fly from STL to SNN. Avoiding peak travel times is often the key to finding better fares.
What is the cheapest airline that flies from Lambert-St. Louis Intl. Airport (STL) to Shannon Airport (SNN)?
To find the cheapest airline that'll fly you from STL to SNN, use Expedia's filter tool. Tailor your search based on what matters most to you, such as preferred carriers and seat class. You can then sort your results by "Price (lowest to highest)" to see the cheapest fares upfront.
How many flights per day from Lambert-St. Louis Intl. Airport (STL) to Shannon Airport (SNN)?
There are no daily direct flights available from Lambert-St. Louis Intl. Airport (STL) to Shannon Airport (SNN). But you can book flights with layovers. Filter your search on Expedia to include one or more stops, and you'll be soaring above the clouds before you know it.
What day of the week has the most flights from STL to SNN?
Typically you'll find the widest variety of flight choices on a Friday. Tuesdays are often the quietest.* But this can change depending on the season, carrier and other factors.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from Lambert-St. Louis Intl. Airport (STL) to Shannon Airport (SNN)?
Opt for a flight from Lambert-St. Louis Intl. Airport (STL) to Shannon Airport (SNN) that takes off before 3 PM to reduce the likelihood of delays and cancellations. Departures after this time have a 22% higher chance of being canceled, on average.**Most reliable time of the day and month to travel recommendation is based on January through August 2024 flight status data sourced from OAG's global flight data platform.
Is it cheaper to buy a plane ticket from Lambert-St. Louis Intl. Airport (STL) to Shannon Airport (SNN) last-minute?
Booking your plane ticket from STL to SNN just before your getaway is usually more expensive. But if there's some wiggle room with your departure dates and times, you could snag a cheap last-minute fare.
Is it cheaper to book a STL to SNN flight and hotel package?
You'll generally save money by securing a STL to SNN flight and hotel package compared to booking separately. In fact, travelers could save hundreds of dollars by bundling with Expedia. And it's easy to manage it all in one place. Once you've selected your preferred flights and accommodations, consider adding extras such as car rentals, tours and activities.
Can I cancel or change the date of my flight from Lambert-St. Louis Intl. Airport (STL) to Shannon Airport (SNN)?
If you booked your STL to SNN flight in the last 24 hours, you may be able to cancel or modify it without fees. Depending on the airline and the ticket type you purchased, additional charges may apply for changes beyond that time. Airline policies and contact information can be found in your itinerary or confirmation email. Or, visit our Customer Service portal for further details.

Travel information

Travel information

Origin airport
Lambert-St. Louis Intl.
Destination airport
Shannon
Airlines serving
Air Canada, American Airlines, British Airways, Delta, Lufthansa, United
Roundtrip price
$506
Distance
3826 mi

Book with confidence

Book with confidence

St. Louis to Shannon Flights

The cheapest times to fly from St. Louis to Shannon

On average, Thursday can be the cheapest time to fly, according to data from the Airlines Reporting Corporation (ARC), one of the world's biggest databases for global airline sales. The data reveals that you could save up to 16% by flying on a Thursday—the cheapest day to travel on average—instead of a Sunday—the most expensive. Some of the most affordable flights from St. Louis to Shannon are during the month of April. You can find some of the cheapest flights from St. Louis to Shannon with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from St. Louis to Shannon

Sunday is one of the best days to book for cheap flights from St. Louis to Shannon: Tickets reserved on a Sunday cost between 6% and 13% less than those reserved on a Friday, according to ARC data. The data also suggests booking early can also lead to cheaper airfares. You could save 24% by buying your tickets for domestic flights at least a month in advance and 10% by booking international flights 2 months in advance.

 

How to find cheap round-trip tickets from St. Louis to Shannon

Being flexible with your dates and using Expedia's Price Drop Protection and Price Tracking features are some of the best ways of finding a cheap ticket from St. Louis to Shannon in 2025. You can also book with separate airlines for your outbound and return journeys, from $413 one-way. Expedia also offers Price Drop Protection, so if the cost of your airfare goes down after booking, you'll receive a credit for the difference*. This is available for a small fee, and is free to One Key Gold and Platinum tier members.

 

Expedia's Price Tracking feature means you can stay on top of airfares without manually checking every day. It sends you automated price alerts for cheap St. Louis to Shannon flights and uses historical data to indicate when the best time to book is. Download Expedia's free app to activate this handy tool in a few easy taps.

 

You could also save big by booking one of Expedia's vacation packages. Bundling together your St. Louis to Shannon airfare with your accommodations and car rental is often cheaper than booking everything separately. There’s also One Key, Expedia's generous rewards program. Join for free and you could earn One Key cash on most bookings to save on future adventures.

 

*Terms apply.

 

Disclaimer: ARC The statistics are based on average round-trip ticket prices between January and August 2023. The percentages you see are averages.

 

St. Louis to Shannon Flights

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*Available to One Key members.