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Shannon

$528+ 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 8/11. Fares are subject to change and may not be available on all flights or dates of travel.
STL — SNN
Jul 8 — Jul 151
Tue 7/8
Tue 7/15
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 July 3, 2025.

Round-trip from

$528
(United Airlines)

Popular in

June

Cheapest in

December

Average price

$1,033
From Lambert-St Louis to Shannon
Search Deals
Highest demand for flights based on searches. 17% potential increase in price ($180 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($21 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in July 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 July 3, 2025.

This United Airlines deal was found by Cheapflights users on 7/2. 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 8/116:15 amSTL - SNN
2 stops19h 15mUnited Airlines
Wed 8/209:30 amSNN - STL
1 stop12h 14mUnited Airlines
Deal found 7/2$528
This American Airlines deal was found by Cheapflights users on 7/1. 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.
Mon 9/152:11 pmSTL - SNN
2 stops15h 09mAmerican Airlines
Wed 9/247:40 amSNN - STL
2 stops18h 35mAmerican Airlines
Deal found 7/1$560
This Delta deal was found by Cheapflights users on 7/2. 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.
Mon 8/113:40 pmSTL - SNN
2 stops13h 30mDelta
Wed 8/201:05 pmSNN - STL
2 stops14h 57mDelta
Deal found 7/2$622
This Air Canada deal was found by Cheapflights users on 7/1. 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 10/91:30 pmSTL - SNN
2 stops25h 05mAir Canada
Thu 10/239:15 pmSNN - STL
2 stops24h 03mAir Canada
Deal found 7/1$807
This KAYAK deal was found by Cheapflights users on 7/1. 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.
Mon 7/148:01 pmSTL - SNN
2 stops18h 34mBritish Airways
Fri 7/257:40 amSNN - STL
2 stops18h 39mBritish Airways
Deal found 7/1$1,117
This Booking.com deal was found by Cheapflights users on 7/1. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/91:30 pmSTL - SNN
2 stops20h 40mMultiple Airlines
Thu 10/2312:30 pmSNN - STL
1 stop13h 17mMultiple Airlines
Deal found 7/1$1,120
This Gurufare deal was found by Cheapflights users on 7/1. 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 10/911:39 amSTL - SNN
1 stop16h 36mLufthansa
Thu 10/2312:30 pmSNN - STL
1 stop17h 14mLufthansa
Deal found 7/1$1,251

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 July 3, 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 8/11

1:20 pm-7:30 am

1 stop12h 10m

Shannon

Wed 8/20

9:30 am-3:44 pm

1 stop12h 14m

$528

St. LouisShannon

STL - SNN

STLSNN

Lambert-St Louis

Mon 9/15

2:11 pm-11:20 am

2 stops15h 09m

Shannon

Wed 9/24

7:40 am-8:15 pm

2 stops18h 35m

$560

St. LouisShannon

STL - SNN

STLSNN

Lambert-St Louis

Mon 8/11

3:40 pm-11:10 am

2 stops13h 30m

Shannon

Wed 8/20

1:05 pm-10:02 pm

2 stops14h 57m

$622

St. LouisShannon

STL - SNN

STLSNN

Lambert-St Louis

Thu 10/9

1:30 pm-8:35 pm

2 stops25h 05m

Shannon

Thu 10/23

9:15 pm-3:18 pm

2 stops24h 03m

$807

St. LouisShannon

STL - SNN

STLSNN

Lambert-St Louis

Mon 7/14

8:01 pm-8:35 pm

2 stops18h 34m

Shannon

Fri 7/25

7:40 am-8:19 pm

2 stops18h 39m

$1,117

St. LouisShannon

STL - SNN

STLSNN

Lambert-St Louis

Thu 10/9

1:30 pm-4:10 pm

2 stops20h 40m

Shannon

Thu 10/23

12:30 pm-7:47 pm

1 stop13h 17m

$1,120

St. LouisShannon

STL - SNN

STLSNN

Lambert-St Louis

Thu 10/9

11:39 am-10:15 am

1 stop16h 36m

Shannon

Thu 10/23

12:30 pm-11:44 pm

1 stop17h 14m

$1,251

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/2

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 $938). 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.

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

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 July 3, 2025.
See what other customers who have flown with Delta, 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.
Delta
8.0
Very good
7,982 reviews

Comfort

7.9

Crew

8.5

Boarding

8.2

Overall

8.0

Entertainment

7.9

Food

7.3

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
Delta
8.0
Very good
7,982 reviews
Delta
8.0
Very good
7,982 reviews

Comfort

7.9

Crew

8.5

Boarding

8.2

Overall

8.0

Entertainment

7.9

Food

7.3

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
United Airlines
7.4
Good
8,861 reviews
Delta
8.0
Very good
7,982 reviews

Comfort

7.9

Crew

8.5

Boarding

8.2

Overall

8.0

Entertainment

7.9

Food

7.3

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
American Airlines
7.2
Good
10,000 reviews
Delta
8.0
Very good
7,982 reviews

Comfort

7.9

Crew

8.5

Boarding

8.2

Overall

8.0

Entertainment

7.9

Food

7.3

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
Air Canada
7.1
Good
9,681 reviews
Delta
8.0
Very good
7,982 reviews

Comfort

7.9

Crew

8.5

Boarding

8.2

Overall

8.0

Entertainment

7.9

Food

7.3

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
Lufthansa
6.8
Okay
7,207 reviews
Delta
8.0
Very good
7,982 reviews

Comfort

7.9

Crew

8.5

Boarding

8.2

Overall

8.0

Entertainment

7.9

Food

7.3

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

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.

  • 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 $528. Other airlines that can offer you cheap pricing are American Airlines, from $560, and Delta, from $622. United Airlines is priced at 39% 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 $938). 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

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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 July 3, 2025.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest$518Average$907FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$703Average$1,011FlexibilityNo cancel feeOn-time69%

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