HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Shannon

$746+ Cheap flights from St. Louis (STL) to Shannon (SNN)

This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 9/15. Fares are subject to change and may not be available on all flights or dates of travel.
STL — SNN
Aug 24 — Aug 311
Sun 8/24
Sun 8/31
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from St. Louis to Shannon with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

Cheap flight deals from St. Louis to Shannon

Discover tips and strategies to find the most affordable flight options for your journey from St. Louis (STL) to Shannon (SNN). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated August 19, 2025.

Round-trip from

$653
(American Airlines)

Popular in

June

Cheapest in

December

Average price

$877
From Lambert-St Louis to Shannon
Search Deals
Highest demand for flights based on searches. 13% potential increase in price ($125 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($27 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in August 2025
Search Deals

Find flight deals from St. Louis to Shannon

Cheapest flights from St. Louis to Shannon
Explore the most affordable flight options available from St. Louis to Shannon. Find the lowest fares from popular airlines and budget airlines, with prices last updated on August 19, 2025.

This United Airlines deal was found by Cheapflights users on 8/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/159:17 amSTL - SNN
1 stop16h 13mUnited Airlines
Wed 9/249:30 amSNN - STL
1 stop14h 53mUnited Airlines
Deal found 8/18$746
This United Airlines deal was found by Cheapflights users on 8/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/25:24 pmSTL - SNN
1 stop10h 51mUnited Airlines
Thu 10/912:30 pmSNN - STL
2 stops15h 30mUnited Airlines
Deal found 8/18$810
This Air Canada deal was found by Cheapflights users on 8/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/154:05 pmSTL - SNN
2 stops18h 05mMultiple Airlines
Wed 9/247:40 amSNN - STL
3 stops20h 55mMultiple Airlines
Deal found 8/17$967
This Gurufare deal was found by Cheapflights users on 8/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Gurufare is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/211:39 amSTL - SNN
1 stop16h 36mLufthansa
Thu 10/912:30 pmSNN - STL
1 stop17h 14mLufthansa
Deal found 8/18$993
This Air Canada deal was found by Cheapflights users on 8/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/24:05 pmSTL - SNN
2 stops22h 30mMultiple Airlines
Thu 10/99:15 pmSNN - STL
3 stops27h 02mMultiple Airlines
Deal found 8/18$1,077

Cheapflights Fare Finder

 
Customize your flight search to find flights from St. Louis to Shannon 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, Cheapflights users made 2,558,603 searches. Data last updated August 19, 2025.
Use the filters below to find and compare flights from St. Louis to Shannon that are best for you.

Fly from

St. Louis

Fly to

Shannon

Route

Depart

Return

Price

St. LouisShannon

STL - SNN

STLSNN

Lambert-St Louis

Mon 9/15

5:22 pm-10:15 am

1 stop10h 53m

Shannon

Wed 9/24

9:30 am-5:52 pm

1 stop14h 22m

$746

St. LouisShannon

STL - SNN

STLSNN

Lambert-St Louis

Thu 10/2

6:30 am-10:15 am

2 stops21h 45m

Shannon

Thu 10/9

12:30 pm-10:00 pm

2 stops15h 30m

$810

St. LouisShannon

STL - SNN

STLSNN

Lambert-St Louis

Mon 9/15

4:05 pm-4:10 pm

2 stops18h 05m

Shannon

Wed 9/24

7:40 am-10:35 pm

3 stops20h 55m

$967

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

St. LouisShannon

STL - SNN

STLSNN

Lambert-St Louis

Thu 10/2

4:05 pm-8:35 pm

2 stops22h 30m

Shannon

Thu 10/9

9:15 pm-6:17 pm

3 stops27h 02m

$1,077

Flights are sorted by cheapest round-trip flights first.

Deals found on 8/17

Best time to book a flight from St. Louis to Shannon

Have a flexible travel schedule? Discover the best time to fly to Shannon from St. Louis with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from St. Louis to Shannon

What is the cheapest month to book a flight from St. Louis to Shannon, Clare?

Currently, February is the cheapest month in which you can book a flight from St. Louis to Shannon, Clare (average of $533). Flying from St. Louis to Shannon, Clare in June is currently the most expensive (average of $931). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

Reviews of airlines servicing Shannon

Get insights into the airlines that provide service to Shannon. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Shannon. Reviews last updated August 19, 2025.
See what other customers who have flown with United Airlines and American Airlines from St. Louis to Shannon have to say. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
United Airlines
7.4
Good
8,922 reviews

Crew

8.1

Overall

7.4

Comfort

7.3

Boarding

7.7

Food

6.6

Entertainment

7.1

Reviews

1 / 20
4.0
Okay

Thomas,Mar 2025

SFO - TPE

When I asked for an extra snack, I got an unhappy look from the stewardess. Geez, does one extra snack really affect the bottom line??
United Airlines
7.4
Good
8,922 reviews
United Airlines
7.4
Good
8,922 reviews

Crew

8.1

Overall

7.4

Comfort

7.3

Boarding

7.7

Food

6.6

Entertainment

7.1

Reviews

1 / 20
4.0
Okay

Thomas,Mar 2025

SFO - TPE

When I asked for an extra snack, I got an unhappy look from the stewardess. Geez, does one extra snack really affect the bottom line??
American Airlines
7.2
Good
10,000 reviews
United Airlines
7.4
Good
8,922 reviews

Crew

8.1

Overall

7.4

Comfort

7.3

Boarding

7.7

Food

6.6

Entertainment

7.1

Reviews

1 / 20
4.0
Okay

Thomas,Mar 2025

SFO - TPE

When I asked for an extra snack, I got an unhappy look from the stewardess. Geez, does one extra snack really affect the bottom line??

Related info for your journey

Find useful and relevant information for your journey from St. Louis to Shannon. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • How long is the flight from St. Louis to Shannon, Clare?

    Departing from St. Louis to Shannon, Clare will take you 10h 53m. The distance between St. Louis and Shannon, Clare is about 3824 mi.

  • What are the cheapest airlines flying from St. Louis to Shannon, Clare round-trip?

    Cheapflights users have booked flights from St. Louis to Shannon, Clare round-trip from $518. Another airline that can offer you cheap pricing is United Airlines. American Airlines is priced at 36% lower than the current average price of a flight leaving 3 months from now.

  • Can I find deals for flights from St. Louis to Shannon that include hotel bookings?

    Yes. In addition to deals on St. Louis to Shannon flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from St. Louis to Shannon?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from St. Louis to Shannon.

  • Can I find deals for business class flights from St. Louis to Shannon?

    Yes. Cheapflights offers flight deals from St. Louis to Shannon by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from St. Louis to Shannon, Clare?

    Currently, February is the cheapest month in which you can book a flight from St. Louis to Shannon, Clare (average of $533). Flying from St. Louis to Shannon, Clare in June is currently the most expensive (average of $931). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Traveling to a place near Shannon?

Book flights to Shannon if you plan to visit one of these locations
Ennis

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Top 2 airlines flying from St. Louis to Shannon

Discover the top 2 airlines that operate flights from St. Louis to Shannon. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated August 19, 2025.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest$518Average$900FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$671Average$992FlexibilityNo cancel feeOn-time69%

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.