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Shannon

$658+ 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 8/16. Fares are subject to change and may not be available on all flights or dates of travel.
STL — SNN
Apr 22 — Apr 291
Wed 4/22
Wed 4/29
1 adult, Economy
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Cheap 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 March 23, 2026.

This United Airlines deal was found by Cheapflights users on 3/20. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/1610:24 am
STL
-
SNN
1 stop15h 06m
United Airlines
Fri 8/289:30 am
SNN
-
STL
1 stop14h 00m
United Airlines
Deal found 3/20$658
This United Airlines deal was found by Cheapflights users on 3/20. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/156:55 pm
STL
-
SNN
1 stop30h 35m
United Airlines
Fri 8/219:30 am
SNN
-
STL
1 stop12h 08m
United Airlines
Deal found 3/20$659
This KLM deal was found by Cheapflights users on 3/20. 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 KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/164:13 pm
STL
-
SNN
1 stop12h 57m
KLM
Fri 8/281:05 pm
SNN
-
STL
2 stops16h 32m
KLM
Deal found 3/20$662
This United Airlines deal was found by Cheapflights users on 3/20. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/156:55 pm
STL
-
SNN
1 stop30h 35m
United Airlines
Sun 8/239:30 am
SNN
-
STL
1 stop10h 55m
United Airlines
Deal found 3/20$708
This United Airlines deal was found by Cheapflights users on 3/19. 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.
Fri 8/218:30 pm
STL
-
SNN
1 stop29h 00m
United Airlines
Tue 8/259:30 am
SNN
-
STL
1 stop32h 43m
United Airlines
Deal found 3/19$714
This United Airlines deal was found by Cheapflights users on 3/20. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/98:35 am
STL
-
SNN
2 stops19h 40m
United Airlines
Tue 9/229:30 am
SNN
-
STL
1 stop14h 46m
United Airlines
Deal found 3/20$724

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 March 23, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$658
(United Airlines)
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

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 March 23, 2026.
Use the filters below to find and compare flights from St. Louis to Shannon that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

St. LouisShannon

STL - SNN

STLSNN

Lambert-St Louis

Sat 8/15

6:55 pm-7:30 am

1 stop30h 35m

Shannon

Fri 8/21

9:30 am-3:38 pm

1 stop12h 08m

$659
Quickest round-trip

St. LouisShannon

STL - SNN

STLSNN

Lambert-St Louis

Sun 8/16

4:13 pm-11:10 am

1 stop12h 57m

Shannon

Fri 8/28

1:05 pm-11:01 pm

2 stops15h 56m

$662

St. LouisShannon

STL - SNN

STLSNN

Lambert-St Louis

Sun 8/16

4:13 pm-11:10 am

1 stop12h 57m

Shannon

Fri 8/28

1:05 pm-11:37 pm

2 stops16h 32m

$662

St. LouisShannon

STL - SNN

STLSNN

Lambert-St Louis

Sun 8/16

11:25 am-7:30 am

1 stop14h 05m

Shannon

Fri 8/28

12:30 pm-9:22 pm

2 stops14h 52m

$673

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-2:25 pm

1 stop10h 55m

$708

St. LouisShannon

STL - SNN

STLSNN

Lambert-St Louis

Fri 8/21

8:30 pm-7:30 am

1 stop29h 00m

Shannon

Tue 8/25

9:30 am-12:13 pm

1 stop32h 43m

$714
Cheapest one-way

St. LouisShannon

STL - SNN

STLSNN

Lambert-St Louis

Fri 5/15

8:30 pm-10:15 am

2 stops31h 45m

$729

St. LouisShannon

STL - SNN

STLSNN

Lambert-St Louis

Fri 5/15

3:30 pm-11:15 am

1 stop13h 45m

$799
Quickest one-way

St. LouisShannon

STL - SNN

STLSNN

Lambert-St Louis

Fri 5/15

9:35 pm-3:50 pm

1 stop12h 15m

$1,030

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/20

Sorted by cheapest first

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 March.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
AranGrantPrice Accuracy2 starsTrust Score*2 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars

*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 FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on St. Louis-Shannon, Clare flight deals on Cheapflights vs. FlightHub >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 FlightHub the most. FlightHub 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.

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 March 23, 2026.
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
9,467 reviews

Overall

7.4

Entertainment

7.1

Food

6.6

Crew

8.1

Comfort

7.3

Boarding

7.7

Reviews

1 / 20
10.0
Excellent

Dane,Jan 2026

TYS - IAD

It was a short flight, so no time for amenities. Just glad everything was quick and easy from boarding to arriving at my destination with my family
United Airlines
7.4
Good
9,467 reviews
United Airlines
7.4
Good
9,467 reviews

Overall

7.4

Entertainment

7.1

Food

6.6

Crew

8.1

Comfort

7.3

Boarding

7.7

Reviews

1 / 20
10.0
Excellent

Dane,Jan 2026

TYS - IAD

It was a short flight, so no time for amenities. Just glad everything was quick and easy from boarding to arriving at my destination with my family
American Airlines
7.1
Good
11,492 reviews
United Airlines
7.4
Good
9,467 reviews

Overall

7.4

Entertainment

7.1

Food

6.6

Crew

8.1

Comfort

7.3

Boarding

7.7

Reviews

1 / 20
10.0
Excellent

Dane,Jan 2026

TYS - IAD

It was a short flight, so no time for amenities. Just glad everything was quick and easy from boarding to arriving at my destination with my family

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 12h 57m. The distance between St. Louis and Shannon, Clare is about 3824 mi. This flight may include one or multiple stops.

  • 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 $483. Another airline that can offer you cheap pricing is United Airlines.

  • 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.

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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Alternative routes for St. Louis to Shannon

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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 March 23, 2026.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest$483Average$719FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$546Average$833FlexibilityNo cancel feeOn-time69%

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