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Shannon

$513+ 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 9/17. Fares are subject to change and may not be available on all flights or dates of travel.
STL — SNN
Sep 5 — Sep 121
Sat 9/5
Sat 9/12
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 August 6, 2026.

This United Airlines deal was found by Cheapflights users on 8/4. 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.
Tue 9/294:50 pm -
1 stop11h 25m
Mon 10/512:30 pm -
1 stop14h 39m
Deal found 8/4$818
This United Airlines deal was found by Cheapflights users on 8/4. 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 9/98:00 am -
1 stop17h 30m
Tue 9/2212:30 pm -
1 stop17h 08m
Deal found 8/4$828
This United Airlines deal was found by Cheapflights users on 8/4. 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 9/1012:59 pm -
1 stop12h 31m
Thu 9/1712:30 pm -
1 stop14h 17m
Deal found 8/4$829
This United Airlines deal was found by Cheapflights users on 8/5. 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 8/164:50 pm -
1 stop11h 25m
Fri 8/289:30 am -
1 stop12h 08m
Deal found 8/5$869
This Delta deal was found by Cheapflights users on 8/4. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/169:15 am -
2 stops19h 55m
Fri 8/281:05 pm -
2 stops26h 15m
Deal found 8/4$873
This United Airlines deal was found by Cheapflights users on 8/6. 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 8/316:54 pm -
1 stop30h 36m
Thu 9/109:30 am -
1 stop10h 45m
Deal found 8/6$875
This United Airlines deal was found by Cheapflights users on 8/6. 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 9/146:00 am -
1 stop19h 30m
Mon 9/219:30 am -
1 stop12h 08m
Deal found 8/6$888
This United Airlines deal was found by Cheapflights users on 8/4. 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.
Tue 9/13:24 pm -
1 stop10h 06m
Tue 9/812:30 pm -
1 stop17h 08m
Deal found 8/4$891

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 August 6, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$818
(United Airlines)

One-way from

$513
(United Airlines)

Popular in

June

Cheapest in

December

Average price

$738
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. 18% potential increase in price ($194 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 6% potential price decrease ($52 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in August 2026
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 August 6, 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 Lambert-St Louis - SNN Shannon

STLSNN

Lambert-St Louis

Tue 9/29

9:00 am-10:15 am

2 stops19h 15m

Shannon

Mon 10/5

12:30 pm-9:09 pm

1 stop14h 39m

$822
Quickest round-trip

St. LouisShannon

STL Lambert-St Louis - SNN Shannon

STLSNN

Lambert-St Louis

Thu 9/10

3:32 pm-7:30 am

1 stop9h 58m

Shannon

Thu 9/17

9:30 am-3:38 pm

1 stop12h 08m

$829

St. LouisShannon

STL Lambert-St Louis - SNN Shannon

STLSNN

Lambert-St Louis

Wed 9/9

8:30 am-7:30 am

1 stop17h 00m

Shannon

Tue 9/22

12:30 pm-12:40 pm

2 stops30h 10m

$832

St. LouisShannon

STL Lambert-St Louis - SNN Shannon

STLSNN

Lambert-St Louis

Thu 9/10

10:29 am-11:10 am

2 stops18h 41m

Shannon

Thu 9/17

1:05 pm-9:00 am

2 stops25h 55m

$833
Cheapest one-way
Quickest one-way

St. LouisShannon

STL Lambert-St Louis - SNN Shannon

STLSNN

Lambert-St Louis

Thu 9/17

12:28 pm-10:15 am

1 stop15h 47m

$513

St. LouisShannon

STL Lambert-St Louis - SNN Shannon

STLSNN

Lambert-St Louis

Thu 9/17

11:01 am-3:50 pm

3 stops46h 49m

$8,220

Flights are sorted by cheapest round-trip flights first.

Deals found on 8/2

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 August.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
AranGrantPrice Accuracy3 starsTrust Score*3 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.

Cheapflights Insights

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

How much does it cost to fly round-trip from St. Louis to Shannon, Clare?

Airfare is typical for this route at the moment.

St. Louis to Shannon, Clare flights typically cost between $608 and $936 in September.
The cheapest round-trip price found within the last 5 days was $818 on United Airlines (Sep 29-Oct 5).

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 6, 2026.
See what other customers who have flown with United 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
10,072 reviews

Boarding

7.7

Comfort

7.3

Overall

7.4

Food

6.7

Crew

8.1

Entertainment

7.1

Reviews

1 / 20
2.0
Mediocre

Dawn,Aug 2026

ORD - DEN

I missed my connecting flight because our plane took off ten minutes late and then when we got to the airport another plane was in our shoot waiting to get fueled up and that took 30 minutes so I missed my connecting flight. I asked if I could get off and they assured me the plane would most likely wait for me since they know what time the planes get in because of an app. I was not happy. I had to wait till 7:25 to board the next flight and then that was delayed. Gates changed till 9:20. Terrible
United Airlines
7.4
Good
10,072 reviews
United Airlines
7.4
Good
10,072 reviews

Boarding

7.7

Comfort

7.3

Overall

7.4

Food

6.7

Crew

8.1

Entertainment

7.1

Reviews

1 / 20
2.0
Mediocre

Dawn,Aug 2026

ORD - DEN

I missed my connecting flight because our plane took off ten minutes late and then when we got to the airport another plane was in our shoot waiting to get fueled up and that took 30 minutes so I missed my connecting flight. I asked if I could get off and they assured me the plane would most likely wait for me since they know what time the planes get in because of an app. I was not happy. I had to wait till 7:25 to board the next flight and then that was delayed. Gates changed till 9:20. Terrible

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 11h 25m. The distance between St. Louis and Shannon, Clare is about 3824 mi.

  • What is the cheapest airline to fly from St. Louis to Shannon, Clare round-trip?

    Cheapflights users have booked flights from St. Louis to Shannon, Clare round-trip from $596. United Airlines is priced at 32% 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.

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Alternative routes for St. Louis to Shannon

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Top airline flying from St. Louis to Shannon

Discover the top airline 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 6, 2026.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$596Average$880FlexibilityNo cancel feeOn-time69%

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