STL - SNN

$484 Find Cheap Flights from St. Louis to Shannon

This is the cheapest round-trip flight price found by a KAYAK user in the last 72 hours by searching for a flight from St. Louis to Shannon departing on 1/14. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult
1 adult, Economy, 0 bags

KAYAK searches hundreds of travel sites at once for deals on flights to Shannon

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from St. Louis to Shannon, as well as popular online travel agencies
These are the airlines KAYAK users have selected most often from within our search results in flight searches from St. Louis to Shannon, as well as popular online travel agencies
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Everything you should know

Cheapest round-trip
$484
American Airlines
Wed 1/14Wed 1/21
STL - SNN • 2 stops
Cheapest one-way
Multiple Airlines
Sat 12/13
STL - SNN • multi-stop
Top airlines
American Airlines
Cheapest • from $484 (round-trip)
United Airlines
Best reviews • 7.4 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
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We hope you love your trip to Shannon!
Flight Deals
Booking Insights
Flight Deals

Cheap Flights from St. Louis to Shannon (STL-SNN)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from St. Louis to Shannon that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from St. Louis to Shannon

Wed, Jan 14 - Wed, Jan 21
American Airlines Logo
6:44 pm - 4:45 pm
STL
-
SNN
16h 01m2 stops
American Airlines Logo
7:50 am - 9:15 pm
SNN
-
STL
19h 25m2 stops
$484American Airlines
Tue, Jan 27 - Thu, Feb 5
British Airways Logo
2:54 pm - 11:30 am
STL
-
SNN
14h 36m2 stops
British Airways Logo
7:50 am - 6:14 pm
SNN
-
STL
16h 24m2 stops
$658British Airways
Wed, Mar 18 - Mon, Mar 23
American Airlines Logo
4:32 pm - 11:30 am
STL
-
SNN
13h 58m2 stops
American Airlines Logo
2:45 pm - 11:29 am
SNN
-
STL
25h 44m1 stop
$669American Airlines
Sun, Jan 25 - Fri, Feb 6
Air Canada Logo
4:05 pm - 11:30 am
STL
-
SNN
37h 25m2 stops
Air Canada Logo
7:50 am - 3:29 pm
SNN
-
STL
37h 39m2 stops
$682Air Canada
Wed, Jan 28 - Wed, Feb 4
American Airlines Logo
2:54 pm - 11:30 am
STL
-
SNN
14h 36m2 stops
American Airlines Logo
2:45 pm - 9:03 am
SNN
-
STL
24h 18m1 stop
$685American Airlines
Wed, Jan 28 - Wed, Feb 4
Multiple Airlines Logo
11:20 am - 11:30 am
STL
-
SNN
18h 10m3 stops
Multiple Airlines Logo
7:50 am - 3:29 pm
SNN
-
STL
37h 39m2 stops
$687Multiple Airlines
Wed, Jan 28 - Wed, Feb 4
American Airlines Logo
12:11 pm - 6:20 am
STL
-
SNN
12h 09m1 stop
American Airlines Logo
2:45 pm - 2:23 pm
SNN
-
STL
29h 38m1 stop
$694American Airlines
Wed, Mar 18 - Mon, Mar 23
Multiple Airlines Logo
11:59 am - 6:20 am
STL
-
SNN
13h 21m1 stop
Multiple Airlines Logo
2:00 pm - 11:08 am
SNN
-
STL
26h 08m1 stop
$719Multiple Airlines
Wed, Mar 25 - Sat, Apr 4
Multiple Airlines Logo
4:05 pm - 11:30 am
STL
-
SNN
38h 25m2 stops
Multiple Airlines Logo
12:30 pm - 7:48 pm
SNN
-
STL
13h 18m1 stop
$723Multiple Airlines
Wed, Mar 25 - Sat, Apr 4
Multiple Airlines Logo
4:05 pm - 11:30 am
STL
-
SNN
14h 25m2 stops
Multiple Airlines Logo
12:00 pm - 9:03 pm
SNN
-
STL
39h 03m2 stops
$738Multiple Airlines
Booking Insights

KAYAK's insights & trends for St. Louis to Shannon flights

Get data-powered insights and trends into flights from St. Louis to Shannon to help you find the cheapest flights, the best time to fly and much more.

Which airlines provide the cheapest flights from St. Louis to Shannon?

The cheapest round-trip price for the route for each airline clicked by KAYAK users in the last 72 hours.

In the past 3 days, the cheapest round-trip tickets from St. Louis to Shannon were found on American Airlines ($484) and British Airways ($658).

Which airlines fly non-stop between St. Louis and Shannon?

Airline and price data is aggregated from results in KAYAK’s search results from the last 2 weeks for round-trip flights from St. Louis to Shannon.

There are 2 airlines that fly nonstop from St. Louis to Shannon. They are American Airlines and United Airlines. The cheapest airline for this route is American Airlines, with the best round-trip deal found costing $548. On average, the best prices for this route can be found at American Airlines.

Good to know

Low seasonDecember
Cheapest flight$484
Best time to beat the crowds with an average 38% drop in price.
Most popular time to fly with an average 39% increase in price.
Flight from St. Louis to Shannon

When to book flights from St. Louis to Shannon

Are your dates flexible? Find out the best times to travel from St. Louis to Shannon based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated round-trip price
KAYAK looks at all historical flight data for each date to provide a predicted price for one-way trips or round-trips with a duration up to 40 days. While we try to provide actual minimum prices for each date, some prices are predictions and actual prices may differ.

FAQs for booking flights from St. Louis to Shannon

  • What is the cheapest flight from St. Louis to Shannon?

    In the last 3 days, the lowest price for a flight from St. Louis to Shannon was $484 for a round-trip ticket.

  • Do I need a passport to fly between St. Louis and Shannon?

    Yes, you'll most likely have to show a valid passport before boarding the plane in St. Louis and on arrival in Shannon.

  • Which aircraft models fly most regularly from St. Louis to Shannon?

    We unfortunately don’t have that data for this specific route.

  • Which airline alliances offer flights from St. Louis to Shannon?

    oneworld, and Star Alliance are the airline alliances operating flights between St. Louis and Shannon, with oneworld being the most commonly used for this route.

  • Which is the best airline for flights from St. Louis to Shannon, United Airlines or American Airlines?

    The two airlines most popular with KAYAK users for flights from St. Louis to Shannon are United Airlines and American Airlines. With an average price for the route of $895 and an overall rating of 7.4, United Airlines is the most popular choice. American Airlines is also a great choice for the route, with an average price of $821 and an overall rating of 7.2.

  • How does KAYAK find such low prices on flights from St. Louis to Shannon?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from St. Louis to Shannon.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from St. Louis to Shannon?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Shannon from St. Louis is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights from St. Louis to Shannon?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to Shannon with an airline and back to St. Louis with another airline. Booking your flights between St. Louis and SNN can sometimes prove cheaper using this method.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from St. Louis to Shannon?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to Shannon from St. Louis up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Reviews of the top airlines flying from St. Louis to Shannon

 
See real verified KAYAK customer reviews for airlines flying from St. Louis to Shannon. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with from St. Louis to Shannon? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
7.4
United AirlinesOverall score based on 9094 reviews
7.3Comfort
8.1Crew
7.1Entertainment
7.7Boarding
6.6Food
Airline reviews

It was nice to have gotten up upgraded to first class with a meal on a three hour flight

10.0 ExcellentMichele, Dec 2025
RSW - ORD
Read more United Airlines reviews

It was nice to have gotten up upgraded to first class with a meal on a three hour flight

Not great experience - we were super late boarding due to issues with aircraft. Then when we finally all got onboard and seated and they started taxiing out to the runway they just stopped then turned around and went back to the airport. Apparently the crew “ran out of time” to legally fly us. They mentioned that they were about 2 minutes away from taking off. I understand the rules and safety but kinda wonder why they would have bothered boarding us in the first place? Had to go all the way back and de plane and then wait in a HUGE line to get a hotel (this is somewhere around 2:30am) finally got to hotel by Uber (no shuttle after 20min so gave up) and they ended up putting us all back on the same aircraft at 10am next morning so got about 2.5 hours sleep. They did give us. $250 credit, but it was a São Paulo Brazil flight out of Dulles. The flight and everything was fine.

United overall experience is great these days. Airport experience was very organized. Staff on flight were great. App and information as good as it gets.

United have really come back. Airport and boarding process is clear and good, app and information also very good

They charged a fee for 1st bag checked. Others in same party were free.

Flight was delayed 8 times. We were sitting at the airport for 14 hours. We got 2 hours of sleep (if that) on what was not meant to be a red-eye.

The movies offered were great. Staff were very pleasant and very efficient.

After a delay at the gate, C3, at Ohare on Sunday, I left my Blk ski coat on the bench at the gate, lost! Please review my lob claim, thx.

Very bad! They kept delaying my flight and wouldn’t do anything about it

They brought an empty plane to the gate. Then a flight delay was announced for maintenance and waiting on a part. I was then put on a flight to San Francisco instead with a connecting flight to my final destination. Arrived at my final destination 2 hours late.

Awful. They won’t help me with anything. I booked on American but they abdicated to Iberia. The ticket was overpriced. Everything negative

it was fine, decent flight... dont get food besides cookies or pretzels so not sure why you ask about food. same for entertainment..

I got sick nothing contagious but distressing and the care I received by Kayla? Keighly the flight attendant will be memorable for ever. Thank You

I got sick nothing contagious but distressing enough and the care I received on the flight was astounding.

Waaay too small plane. They also need to up the size of the overhead bins. I would love to keep me 3k with of camera equipment in my hard case baggahe instead of it being thrown into the belly of the plane

Attendants were pleasant and the flight was smooth and relaxed.

A little late at the start but all worked out well.

It was fine. No drinks nor snacks offered though. I thought that was unusual.

I liked the humor of the captain and crew on the flight from Flagstaff to Dallas. They were humorous.

AA delayed the flight for 3 hours and 50 minutes, but delayed the last 2 hours, 30 minutes at a time, so if we knew before, could have stayed at home and worked instead of being at the airport wasting time... The plane's crew was excellent, not their fault.

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

Information on your arrival and departure airports