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Shannon

$618+ 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 3/13. Fares are subject to change and may not be available on all flights or dates of travel.
STL — SNN
Oct 19 — Oct 261
Sun 10/19
Sun 10/26
1 adult, Economy
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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 September 19, 2025.

Round-trip from

$621
(United Airlines)

One-way from

$618
(American Airlines)

Popular in

June

Cheapest in

December

Average price

$976
From Lambert-St Louis to Shannon
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One-way flight from Lambert-St Louis to Shannon
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Highest demand for flights based on searches. 10% potential increase in price ($98 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease ($27 potential savings vs. average RT price).
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Average for round-trip flights in September 2025
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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 September 19, 2025.

This United Airlines deal was found by Cheapflights users on 9/17. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/156:15 amSTL - SNN
2 stops22h 00mUnited Airlines
Wed 10/2212:30 pmSNN - STL
2 stops16h 05mUnited Airlines
Deal found 9/17$621
This KAYAK deal was found by Cheapflights users on 9/17. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/308:39 amSTL - SNN
2 stops20h 51mBritish Airways
Mon 12/155:30 pmSNN - STL
2 stops29h 20mBritish Airways
Deal found 9/17$731
This American Airlines deal was found by Cheapflights users on 9/17. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/19:43 amSTL - SNN
2 stops15h 37mAmerican Airlines
Sat 11/82:00 pmSNN - STL
2 stops24h 27mAmerican Airlines
Deal found 9/17$803
This British Airways deal was found by Cheapflights users on 9/17. 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 British Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/301:59 pmSTL - SNN
2 stops15h 31mBritish Airways
Wed 1/77:50 amSNN - STL
2 stops21h 42mBritish Airways
Deal found 9/17$831
This Air Canada deal was found by Cheapflights users on 9/17. 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.
Wed 10/151:30 pmSTL - SNN
2 stops25h 05mAir Canada
Wed 10/227:40 amSNN - STL
3 stops20h 55mAir Canada
Deal found 9/17$920
This Ovago deal was found by Cheapflights users on 9/17. 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 Ovago is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/1511:39 amSTL - SNN
1 stop16h 36mLufthansa
Wed 10/2212:30 pmSNN - STL
1 stop17h 27mLufthansa
Deal found 9/17$972
This United Airlines deal was found by Cheapflights users on 9/18. 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 10/21:40 pmSTL - SNN
2 stops14h 35mUnited Airlines
Sun 10/512:30 pmSNN - STL
2 stops15h 30mUnited Airlines
Deal found 9/18$990
This Air Canada deal was found by Cheapflights users on 9/17. 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.
Tue 12/304:05 pmSTL - SNN
2 stops21h 20mMultiple Airlines
Wed 1/77:50 amSNN - STL
3 stops19h 23mMultiple Airlines
Deal found 9/17$1,004

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 September 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

Wed 10/15

6:15 am-10:15 am

2 stops22h 00m

Shannon

Wed 10/22

12:30 pm-10:35 pm

2 stops16h 05m

$621

St. LouisShannon

STL - SNN

STLSNN

Lambert-St Louis

Sun 11/30

8:39 am-11:30 am

2 stops20h 51m

Shannon

Mon 12/15

5:30 pm-4:50 pm

2 stops29h 20m

$731

St. LouisShannon

STL - SNN

STLSNN

Lambert-St Louis

Sat 11/1

9:43 am-6:20 am

2 stops15h 37m

Shannon

Sat 11/8

2:00 pm-8:27 am

2 stops24h 27m

$803

St. LouisShannon

STL - SNN

STLSNN

Lambert-St Louis

Wed 10/15

1:30 pm-8:35 pm

2 stops25h 05m

Shannon

Wed 10/22

7:40 am-10:35 pm

3 stops20h 55m

$920

St. LouisShannon

STL - SNN

STLSNN

Lambert-St Louis

Wed 10/15

11:39 am-10:15 am

1 stop16h 36m

Shannon

Wed 10/22

12:30 pm-11:57 pm

1 stop17h 27m

$972

St. LouisShannon

STL - SNN

STLSNN

Lambert-St Louis

Thu 10/2

1:40 pm-10:15 am

2 stops14h 35m

Shannon

Sun 10/5

12:30 pm-10:00 pm

2 stops15h 30m

$990

St. LouisShannon

STL - SNN

STLSNN

Lambert-St Louis

Sat 11/1

5:24 pm-4:45 pm

3 stops18h 21m

Shannon

Sat 11/8

7:50 am-9:40 pm

3 stops19h 50m

$1,377

St. LouisShannon

STL - SNN

STLSNN

Lambert-St Louis

Fri 3/13

9:28 am-6:20 am

1 stop15h 52m

$618

St. LouisShannon

STL - SNN

STLSNN

Lambert-St Louis

Fri 3/13

6:39 am-11:59 pm

3 stops36h 20m

$722

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/17

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 $928). 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 September 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
8,926 reviews

Comfort

7.3

Food

6.6

Boarding

7.7

Overall

7.4

Crew

8.1

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

Julia,Sep 2025

BUF - DEN

The staff were amazing, from check in to boarding and on the flight. The range of entertainment options were really good as well.
United Airlines
7.4
Good
8,926 reviews
United Airlines
7.4
Good
8,926 reviews

Comfort

7.3

Food

6.6

Boarding

7.7

Overall

7.4

Crew

8.1

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

Julia,Sep 2025

BUF - DEN

The staff were amazing, from check in to boarding and on the flight. The range of entertainment options were really good as well.
American Airlines
7.2
Good
10,000 reviews
United Airlines
7.4
Good
8,926 reviews

Comfort

7.3

Food

6.6

Boarding

7.7

Overall

7.4

Crew

8.1

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

Julia,Sep 2025

BUF - DEN

The staff were amazing, from check in to boarding and on the flight. The range of entertainment options were really good as well.

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 37m. 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 $548. Another airline that can offer you cheap pricing is United Airlines. American Airlines is priced at 35% 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 $928). 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 September 19, 2025.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest$548Average$907FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$671Average$976FlexibilityNo cancel feeOn-time69%

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