$600+ 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 9/17. Fares are subject to change and may not be available on all flights or dates of travel.
STL — SNN
Oct 5 — Oct 121
Round-trip
1 adult, Economy
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Find cheap flights from St. Louis to Shannon with Cheapflights
1. Tell us where you want to go
Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”2. Select your favorite providers
We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.3. Compare prices and book
Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.Cheap flight deals from St. Louis to Shannon
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Best
Last-minute
One-way
Cheapest flights from St. Louis to ShannonExplore 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 5, 2026.
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 5, 2026.
This United Airlines deal was found by Cheapflights users on 9/1. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/164:50 pm -
1 stop11h 25m
Fri 10/2312:30 pm -
1 stop14h 39m
Deal found 9/1![United Airlines logo]()
$853
This United Airlines deal was found by Cheapflights users on 9/2. 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.
Thu 9/1012:59 pm -
1 stop12h 31m
Thu 9/1712:30 pm -
1 stop14h 17m
Deal found 9/2![United Airlines logo]()
$919
This United Airlines deal was found by Cheapflights users on 9/2. 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.
Wed 9/98:20 am -
1 stop19h 55m
Tue 9/229:30 am -
1 stop15h 46m
Deal found 9/2![United Airlines logo]()
$923
This Delta deal was found by Cheapflights users on 9/2. 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.
Thu 9/101:40 pm -
2 stops15h 30m
Thu 9/171:05 pm -
2 stops16h 11m
Deal found 9/2![Delta logo]()
$924
This United Airlines deal was found by Cheapflights users on 9/3. 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 9/2911:35 am -
2 stops16h 40m
Wed 10/712:30 pm -
1 stop14h 39m
Deal found 9/3![United Airlines logo]()
$1,021
This Air Canada deal was found by Cheapflights users on 9/3. 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.
Sun 10/1812:10 pm -
2 stops22h 00m
Sun 10/257:50 am -
2 stops36h 33m
Deal found 9/3![Multiple Airlines logo]()
$1,078
This Cheapflightsfares deal was found by Cheapflights users on 9/3. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/189:40 pm -
1 stop12h 30m
Sun 10/258:05 pm -
2 stops32h 54m
Deal found 9/3![British Airways logo]()
$1,096
This Air Canada deal was found by Cheapflights users on 9/1. 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.
Fri 10/1612:10 pm -
2 stops21h 40m
Fri 10/237:30 am -
3 stops19h 51m
Deal found 9/1![Air Canada logo]()
$1,098
Best flights from St. Louis to ShannonDiscover 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 September 5, 2026.
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 September 5, 2026.
This United Airlines deal was found by Cheapflights users on 9/1. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/169:04 am -
2 stops19h 11m
Fri 10/2312:30 pm -
2 stops16h 29m
Deal found 9/1![United Airlines logo]()
$858
This Ovago deal was found by Cheapflights users on 9/2. 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 Ovago is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 2/1611:34 am -
1 stop12h 16m
Tue 2/232:00 pm -
1 stop27h 04m
Deal found 9/2![Multiple Airlines logo]()
$936
This Air Canada deal was found by Cheapflights users on 9/2. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 2/161:08 pm -
3 stops16h 22m
Tue 2/237:50 am -
3 stops21h 19m
Deal found 9/2![Air Canada logo]()
$967
This Cheapflightsfares deal was found by Cheapflights users on 9/1. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/231:25 pm -
2 stops15h 55m
Sun 9/279:15 pm -
2 stops26h 15m
Deal found 9/1![British Airways logo]()
$1,190
This United Airlines deal was found by Cheapflights users on 9/3. 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 9/2911:35 am -
2 stops16h 40m
Wed 10/712:30 pm -
1 stop14h 39m
Deal found 9/3![United Airlines logo]()
$1,021
This Air Canada deal was found by Cheapflights users on 9/1. 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.
Wed 9/2312:10 pm -
2 stops22h 00m
Sun 9/277:30 am -
3 stops21h 29m
Deal found 9/1![Air Canada logo]()
$1,228
This United Airlines deal was found by Cheapflights users on 9/1. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/158:30 am -
1 stop17h 00m
Fri 9/1812:30 pm -
1 stop17h 08m
Deal found 9/1![United Airlines logo]()
$1,151
This Air Canada deal was found by Cheapflights users on 9/1. 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.
Tue 9/1512:10 pm -
2 stops22h 00m
Fri 9/187:30 am -
3 stops21h 29m
Deal found 9/1![Multiple Airlines logo]()
$1,629
This BusinessClass deal was found by Cheapflights users on 9/2. 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 BusinessClass is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/1511:15 am -
1 stop14h 15m
Tue 9/297:30 am -
2 stops18h 50m
Deal found 9/2![Multiple Airlines logo]()
$4,325
Last-minute flights from St. Louis to ShannonDiscover last-minute flight deals from St. Louis to Shannon. Data last updated September 5, 2026 and is based on user searches.
Discover last-minute flight deals from St. Louis to Shannon. Data last updated September 5, 2026 and is based on user searches.
This United Airlines deal was found by Cheapflights users on 9/2. 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.
Wed 9/98:20 am -
1 stop19h 55m
Tue 9/229:30 am -
1 stop15h 46m
Deal found 9/2![United Airlines logo]()
$923
This United Airlines deal was found by Cheapflights users on 9/2. 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.
Thu 9/1012:59 pm -
1 stop12h 31m
Thu 9/1712:30 pm -
1 stop14h 17m
Deal found 9/2![United Airlines logo]()
$919
This Delta deal was found by Cheapflights users on 9/2. 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.
Thu 9/101:40 pm -
2 stops15h 30m
Thu 9/171:05 pm -
2 stops16h 11m
Deal found 9/2![Delta logo]()
$924
This United Airlines deal was found by Cheapflights users on 9/3. 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 9/2911:35 am -
2 stops16h 40m
Wed 10/712:30 pm -
1 stop14h 39m
Deal found 9/3![United Airlines logo]()
$1,021
This United Airlines deal was found by Cheapflights users on 9/1. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/164:50 pm -
1 stop11h 25m
Fri 10/2312:30 pm -
1 stop14h 39m
Deal found 9/1![United Airlines logo]()
$853
This Air Canada deal was found by Cheapflights users on 9/1. 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.
Fri 10/1612:10 pm -
2 stops21h 40m
Fri 10/237:30 am -
3 stops19h 51m
Deal found 9/1![Air Canada logo]()
$1,098
This Air Canada deal was found by Cheapflights users on 9/3. 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.
Sun 10/1812:10 pm -
2 stops22h 00m
Sun 10/257:50 am -
2 stops36h 33m
Deal found 9/3![Multiple Airlines logo]()
$1,078
This Cheapflightsfares deal was found by Cheapflights users on 9/3. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/189:40 pm -
1 stop12h 30m
Sun 10/258:05 pm -
2 stops32h 54m
Deal found 9/3![British Airways logo]()
$1,096
One-way flights from St. Louis to ShannonSearch for one-way flight options from St. Louis to Shannon. Find affordable one-way fares based on user searches. Data last updated September 5, 2026.
Search for one-way flight options from St. Louis to Shannon. Find affordable one-way fares based on user searches. Data last updated September 5, 2026.
This United Airlines deal was found by Cheapflights users on 9/3. 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 9/178:00 am -
2 stops20h 15m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/3![United Airlines logo]()
$600
This Cathay Pacific deal was found by Cheapflights users on 9/3. 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 Cathay Pacific is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/1711:01 am -
3 stops46h 49m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/3![Multiple Airlines logo]()
$8,219
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 September 5, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $853 (United Airlines) |
One-way from | $600 (United Airlines) |
Popular in | June |
Cheapest in | December |
Average price | $820 |
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 7,457,451 searches. Data last updated September 5, 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
Cheapest round-trip
Quickest round-trip
St. LouisShannon
STL Lambert-St Louis - SNN Shannon
STLSNN
Lambert-St Louis
Thu 9/17
12:28 pm-10:15 am
1 stop15h 47m
Shannon
Wed 12/31
12:00 am-5:00 pm
Nonstop0h 00m
$600
St. LouisShannon
STL Lambert-St Louis - SNN Shannon
STLSNN
Lambert-St Louis
Fri 10/16
9:04 am-10:15 am
2 stops19h 11m
Shannon
Fri 10/23
12:30 pm-10:59 pm
2 stops16h 29m
$858
St. LouisShannon
STL Lambert-St Louis - SNN Shannon
STLSNN
Lambert-St Louis
Tue 2/16
11:34 am-5:50 am
1 stop12h 16m
Shannon
Tue 2/23
2:00 pm-11:04 am
1 stop27h 04m
$936
St. LouisShannon
STL Lambert-St Louis - SNN Shannon
STLSNN
Lambert-St Louis
Tue 2/16
1:08 pm-11:30 am
3 stops16h 22m
Shannon
Tue 2/23
7:50 am-11:09 pm
3 stops21h 19m
$967
St. LouisShannon
STL Lambert-St Louis - SNN Shannon
STLSNN
Lambert-St Louis
Tue 9/29
11:35 am-10:15 am
2 stops16h 40m
Shannon
Wed 10/7
12:30 pm-9:09 pm
1 stop14h 39m
$1,021
St. LouisShannon
STL Lambert-St Louis - SNN Shannon
STLSNN
Lambert-St Louis
Tue 9/15
8:30 am-7:30 am
1 stop17h 00m
Shannon
Fri 9/18
12:30 pm-11:38 pm
1 stop17h 08m
$1,151
St. LouisShannon
STL Lambert-St Louis - SNN Shannon
STLSNN
Lambert-St Louis
Wed 9/23
1:25 pm-11:20 am
2 stops15h 55m
Shannon
Sun 9/27
9:15 pm-5:30 pm
2 stops26h 15m
$1,190
St. LouisShannon
STL Lambert-St Louis - SNN Shannon
STLSNN
Lambert-St Louis
Wed 9/23
12:10 pm-4:10 pm
2 stops22h 00m
Shannon
Sun 9/27
7:30 am-10:59 pm
3 stops21h 29m
$1,228
St. LouisShannon
STL Lambert-St Louis - SNN Shannon
STLSNN
Lambert-St Louis
Tue 9/15
12:10 pm-4:10 pm
2 stops22h 00m
Shannon
Fri 9/18
7:30 am-10:59 pm
3 stops21h 29m
$1,629
St. LouisShannon
STL Lambert-St Louis - SNN Shannon
STLSNN
Lambert-St Louis
Tue 9/15
11:15 am-7:30 am
1 stop14h 15m
Shannon
Tue 9/29
7:30 am-8:20 pm
2 stops18h 50m
$4,325
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 September.
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy1 star | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars |
- 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.
STL-SNN
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
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 5, 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.
Comfort
7.3
Entertainment
7.1
Crew
8.1
Boarding
7.7
Food
6.6
Overall
7.4
Reviews
1 / 20
4.0
OkayChris,Aug 2026
MIA - ORD
Comfort
7.3
Entertainment
7.1
Crew
8.1
Boarding
7.7
Food
6.6
Overall
7.4
Reviews
1 / 20
4.0
OkayChris,Aug 2026
MIA - ORD
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.
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St. Louis and Shannon flights
Browse other St. Louis and Shannon flight options. Last updated on September 5, 2026.
Other flights from St. Louis
Browse through other flights departing from St. Louis. Flights are based on user searches made on Cheapflights and were last updated on September 5, 2026.
Popular flight searches
Check out other popular destinations found by fellow travelers in 2026
Other flights to Shannon
Explore flights to Shannon departing from other origins. Flights are based on user searches made on Cheapflights and were last updated on September 5, 2026.
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 7,457,451 searches. Data last updated September 5, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$596 | Average$880 | FlexibilityNo cancel fee | On-time69% |