Cheap Flights from St. Louis (CPS) to Shannon (SNN)

Popular airlines from St. Louis, MO (CPS-St. Louis Downtown) to Shannon Airport (SNN)

Frequently asked questions

How much does a flight from St. Louis Downtown Airport (CPS) to Shannon Airport (SNN) cost?
Get a cheap one-way flight or cheap return flight from St. Louis Downtown Airport (CPS) to Shannon Airport (SNN) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to see our cheapest flight deals on this route.
What is the cheapest month to fly from St. Louis Downtown Airport (CPS) to Shannon Airport (SNN)?
The cheapest month to fly from CPS to SNN is , when demand is low. Off-peak months are typically when airlines offer lower prices between these airports.
What is the cheapest airline that flies from St. Louis Downtown Airport (CPS) to Shannon Airport (SNN)?
Expedia's filter tool lets you easily compare airlines, flight times and fares all in one place. Tailor the search to your trip, then sort by "Price (lowest to highest)" to see which carrier offers the cheapest CPS to SNN flight.
How many flights per day from St. Louis Downtown Airport (CPS) to Shannon Airport (SNN)?
You'll need to hop on a flight with a layover if you're traveling from St. Louis Downtown Airport (CPS) to Shannon Airport (SNN). Direct flights don't operate daily on this route. However, just filter your search to include one or more stops to find the best option for your trip.
What day of the week has the most flights from CPS to SNN?
Friday is typically the busiest day for flights, while Tuesday is often the quietest.* Remember that flight schedules can vary depending on a number of factors, including the airline and season.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from St. Louis Downtown Airport (CPS) to Shannon Airport (SNN)?
To avoid possible delays on the St. Louis Downtown Airport (CPS) to Shannon Airport (SNN) route, aim to travel before 3 PM. Later departures have a 22% higher chance of cancellation.**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 St. Louis Downtown Airport (CPS) to Shannon Airport (SNN) last-minute?
Waiting until right before your break to book a ticket from CPS to SNN generally means paying more. Although you may find some last-minute deals, they're not always guaranteed. Keep your travel schedule open to boost your chances of getting a bargain.
Is it cheaper to book a CPS to SNN flight and hotel package?
Compared with arranging flights and hotels separately, booking a CPS to SNN flight and hotel package with Expedia could lead to significant savings. Better yet, having everything in one easy place will take the hassle out of travel planning. Just secure your flights and choose from our wide range of hotels, then customize your trip with other add-ons like tours, car rentals and activities.
Can I cancel or change the date of my flight from St. Louis Downtown Airport (CPS) to Shannon Airport (SNN)?
You can usually cancel or reschedule your CPS to SNN flight. However, if it's been more than 24 hours since booking, additional fees may apply. Check your airline's policies in your itinerary to see what changes are allowed and if any costs are involved. You'll also find further details on our Customer Service portal.

Travel information

Travel information

Origin airport
St. Louis Downtown
Destination airport
Shannon
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 . 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 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.