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Shannon

$442+ Cheap flights from St. Louis (STL) to Shannon (SNN)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 5/15. Fares are subject to change and may not be available on all flights or dates of travel.
STL — SNN
Jan 22 — Jan 291
Thu 1/22
Thu 1/29
1 adult, Economy
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Cheap flight deals from St. Louis to Shannon

Best flights from St. Louis to Shannon
Discover carefully curated flight deals from St. Louis to Shannon that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated December 23, 2025.

This American Airlines deal was found by Cheapflights users on 12/22. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 2/61:35 pmSTL - SNN
2 stops15h 55mAmerican Airlines
Fri 2/137:50 amSNN - STL
2 stops21h 38mAmerican Airlines
Deal found 12/22$594
This FlightHub deal was found by Cheapflights users on 12/21. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/254:05 pmSTL - SNN
2 stops14h 25mMultiple Airlines
Sat 4/412:00 pmSNN - STL
1 stop31h 25mMultiple Airlines
Deal found 12/21$629
This Air Canada deal was found by Cheapflights users on 12/20. 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.
Fri 1/304:05 pmSTL - SNN
2 stops13h 25mAir Canada
Tue 2/35:30 pmSNN - STL
2 stops51h 59mAir Canada
Deal found 12/20$683
This American Airlines deal was found by Cheapflights users on 12/21. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/252:32 pmSTL - SNN
2 stops15h 58mAmerican Airlines
Sat 4/47:40 amSNN - STL
2 stops16h 27mAmerican Airlines
Deal found 12/21$605
This Air Canada deal was found by Cheapflights users on 12/22. 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.
Sat 3/74:05 pmSTL - SNN
2 stops18h 40mMultiple Airlines
Sat 3/147:50 amSNN - STL
2 stops36h 39mMultiple Airlines
Deal found 12/22$683
This Air Canada deal was found by Cheapflights users on 12/22. 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.
Fri 2/64:05 pmSTL - SNN
2 stops17h 40mMultiple Airlines
Fri 2/137:50 amSNN - STL
3 stops19h 15mMultiple Airlines
Deal found 12/22$693

Find 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 December 23, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$594
(American Airlines)

One-way from

$442
(KAYAK)

Popular in

June

Cheapest in

December

Average price

$483
Provider with most accurate pricing for Lambert-St Louis-Shannon flight deals.
Search Deals
Provider most trusted by Cheapflights users for Lambert-St Louis-Shannon flights.
Search Deals
From Lambert-St Louis to Shannon
Search Deals
One-way flight from Lambert-St Louis to Shannon
Search Deals
Highest demand for flights based on searches. 16% potential increase in price ($155 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease ($34 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in December 2025
Search Deals

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 December 23, 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

Fri 2/6

1:35 pm-11:30 am

2 stops15h 55m

Shannon

Fri 2/13

7:50 am-11:28 pm

2 stops21h 38m

$594

St. LouisShannon

STL - SNN

STLSNN

Lambert-St Louis

Wed 3/25

2:32 pm-11:30 am

2 stops15h 58m

Shannon

Sat 4/4

7:40 am-6:07 pm

2 stops16h 27m

$605

St. LouisShannon

STL - SNN

STLSNN

Lambert-St Louis

Wed 3/25

4:05 pm-11:30 am

2 stops14h 25m

Shannon

Sat 4/4

12:00 pm-1:25 pm

1 stop31h 25m

$629

St. LouisShannon

STL - SNN

STLSNN

Lambert-St Louis

Fri 1/30

4:05 pm-11:30 am

2 stops13h 25m

Shannon

Tue 2/3

5:30 pm-3:29 pm

2 stops51h 59m

$683

St. LouisShannon

STL - SNN

STLSNN

Lambert-St Louis

Sat 3/7

4:05 pm-4:45 pm

2 stops18h 40m

Shannon

Sat 3/14

7:50 am-3:29 pm

2 stops36h 39m

$683

St. LouisShannon

STL - SNN

STLSNN

Lambert-St Louis

Fri 2/6

4:05 pm-3:45 pm

2 stops17h 40m

Shannon

Fri 2/13

7:50 am-9:05 pm

3 stops19h 15m

$693

St. LouisShannon

STL - SNN

STLSNN

Lambert-St Louis

Fri 5/15

9:15 am-11:20 am

2 stops20h 05m

$442

St. LouisShannon

STL - SNN

STLSNN

Lambert-St Louis

Fri 5/15

3:30 pm-11:15 am

1 stop13h 45m

$703

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/21

Compare providers for flights from St. Louis to Shannon

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from St. Louis to Shannon in December.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy2 starsTrust Score*3 stars
AranGrantPrice Accuracy2 starsTrust Score*3 stars
eDreamsPrice Accuracy3 starsTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*1 star

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on St. Louis-Shannon, Clare flights, users find the pricing of eDreams to be most consistent on Cheapflights vs. eDreams Users can find the same prices on St. Louis-Shannon, Clare flight deals on Cheapflights vs. eDreams >95% of the time. Price accuracy is based on data collected from St. Louis-Shannon, Clare flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on St. Louis-Shannon, Clare flights, Cheapflights users trust eDreams the most. eDreams has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for St. Louis-Shannon, Clare flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

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, December is the cheapest month in which you can book a flight from St. Louis to Shannon, Clare (average of $483). Flying from St. Louis to Shannon, Clare in June is currently the most expensive (average of $752). 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 December 23, 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
9,105 reviews

Overall

7.4

Boarding

7.7

Comfort

7.3

Crew

8.1

Entertainment

7.1

Food

6.6

Reviews

1 / 20
10.0
Excellent

Michelle,Dec 2025

DEN - MKE

I liked that the plane waited 5 minutes for a family whose incoming plane was late. This was the last flight of the day to MKE. Flight attendants actually checked in throughout the flight. Although, not really friendly. Happy to see screens on seat backs again. This is my first time not flying first class in over 10 years. It was economy plus.
United Airlines
7.4
Good
9,105 reviews
United Airlines
7.4
Good
9,105 reviews

Overall

7.4

Boarding

7.7

Comfort

7.3

Crew

8.1

Entertainment

7.1

Food

6.6

Reviews

1 / 20
10.0
Excellent

Michelle,Dec 2025

DEN - MKE

I liked that the plane waited 5 minutes for a family whose incoming plane was late. This was the last flight of the day to MKE. Flight attendants actually checked in throughout the flight. Although, not really friendly. Happy to see screens on seat backs again. This is my first time not flying first class in over 10 years. It was economy plus.
American Airlines
7.2
Good
11,054 reviews
United Airlines
7.4
Good
9,105 reviews

Overall

7.4

Boarding

7.7

Comfort

7.3

Crew

8.1

Entertainment

7.1

Food

6.6

Reviews

1 / 20
10.0
Excellent

Michelle,Dec 2025

DEN - MKE

I liked that the plane waited 5 minutes for a family whose incoming plane was late. This was the last flight of the day to MKE. Flight attendants actually checked in throughout the flight. Although, not really friendly. Happy to see screens on seat backs again. This is my first time not flying first class in over 10 years. It was economy plus.

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 15h 55m. 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 $548. Another airline that can offer you cheap pricing is United Airlines. American Airlines is priced at 29% 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, December is the cheapest month in which you can book a flight from St. Louis to Shannon, Clare (average of $483). Flying from St. Louis to Shannon, Clare in June is currently the most expensive (average of $752). 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

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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 December 23, 2025.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest$548Average$813FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$641Average$899FlexibilityNo cancel feeOn-time69%

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