STL - SNN

$344 Find Cheap Flights from St. Louis to Shannon

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from St. Louis to Shannon departing on 9/29. 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

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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Flights 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, Aug 27 - Wed, Sep 3
United Airlines Logo
6:35 am - 7:30 amSTL-SNN
18h 55m1 stop
United Airlines Logo
9:30 am - 2:19 pmSNN-STL
10h 49m1 stop
$542United Airlines
Find Deal
Wed, Aug 27 - Wed, Sep 3
United Airlines Logo
6:00 am - 7:30 amSTL-SNN
19h 30m2 stops
United Airlines Logo
9:30 am - 9:32 pmSNN-STL
18h 02m1 stop
$546United Airlines
Find Deal
Mon, Sep 15 - Wed, Sep 24
United Airlines Logo
3:20 pm - 7:30 amSTL-SNN
10h 10m1 stop
United Airlines Logo
9:30 am - 10:35 pmSNN-STL
19h 05m1 stop
$547United Airlines
Find Deal
Mon, Sep 15 - Wed, Sep 24
American Airlines Logo
1:53 pm - 11:20 amSTL-SNN
15h 27m2 stops
American Airlines Logo
7:40 am - 9:53 pmSNN-STL
20h 13m2 stops
$559American Airlines
Find Deal
Wed, Aug 20 - Wed, Aug 27
Air Canada Logo
1:30 pm - 8:35 pmSTL-SNN
25h 05m2 stops
Air Canada Logo
7:40 am - 8:00 pmSNN-STL
18h 20m2 stops
$739Air Canada
Find Deal
Mon, Sep 15 - Wed, Sep 24
 Logo
1:30 pm - 4:10 pmSTL-SNN
20h 40m2 stops
 Logo
7:40 am - 10:35 pmSNN-STL
20h 55m3 stops
Wed, Aug 27 - Wed, Sep 3
 Logo
9:15 am - 4:10 pmSTL-SNN
24h 55m3 stops
 Logo
7:40 am - 7:57 pmSNN-STL
18h 17m2 stops
Mon, Sep 15 - Wed, Sep 24
Air Canada Logo
1:30 pm - 4:10 pmSTL-SNN
20h 40m2 stops
Air Canada Logo
7:40 am - 10:35 pmSNN-STL
20h 55m3 stops
$960Air Canada
Find Deal
Tue, Sep 16 - Thu, Sep 25
British Airways Logo
1:53 pm - 11:20 amSTL-SNN
15h 27m2 stops
British Airways Logo
7:40 am - 7:10 pmSNN-STL
17h 30m2 stops
$3,461British Airways
Find Deal
Tue, Sep 16 - Tue, Sep 23
British Airways Logo
1:53 pm - 11:20 amSTL-SNN
15h 27m2 stops
British Airways Logo
7:40 am - 8:32 pmSNN-STL
18h 52m2 stops
$3,522British Airways
Find Deal
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.

What is the cheapest month to fly from St. Louis to Shannon?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from St. Louis to Shannon, removes the top 0.1% to account for outliers, and then takes the median of all values for each month.

The cheapest month for flights from St. Louis to Shannon is December, where tickets cost $515 (return) on average. On the other hand, the most expensive months are June and April, where the average cost of round-trip tickets is $1,106 and $1,028 respectively.

Good to know

Low seasonJanuary
Cheapest flight$344
Best time to beat the crowds with an average 4% drop in price.
Most popular time to fly with an average 35% 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 $344 for a one-way ticket and $542 for a round-trip.

  • 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?

    Star Alliance, and oneworld are the airline alliances operating flights between St. Louis and Shannon, with Star Alliance 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 $1,008 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 $900 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 8896 reviews
6.6Food
8.1Crew
7.7Boarding
7.1Entertainment
7.3Comfort
Airline reviews

Was on time until within 1 hour of flight-how does that happen? Staff very friendly.

8.0 ExcellentHal, Jul 2025IAD - MSY
Read more United Airlines reviews

Was on time until within 1 hour of flight-how does that happen? Staff very friendly.

the delay for 3 hours was understandable due to weather conditions but the flight should’ve provided some on flight compensations or at least provide more food.

Weather delay in Chicago?. No sense of urgency to make connection in Chicago for our connecting flight that wasn't delayed. Connection was missed.

Our flight was understandably diverted to a small regional airport in Laramie, Wyoming due to weather conditions, which I fully recognize and appreciate. However, the low rating stems from the experience that followed: passengers remained on board for over an hour without the option to deplane and stretch, despite the aircraft being stationary. Although the pilot opened the cabin door, only he was permitted to exit. Meanwhile, passengers grew increasingly uncomfortable as warm summer air entered the cabin through the open door, and being in the second row meant we were impacted immediately. While the flight attendants made efforts to keep everyone at ease, I believe allowing passengers to deplane briefly, given the extended delay, would have significantly improved the overall experience.

I never flew. Flight was canceled. DIA worst airport in the country. Avoid at all costs.

I learned that seating towards the end of plane that a line forms for the restroom and people use your chair as a hand railing, bumping your seat consistently. I was seated in the aisle. I think that next time if I am towards the back row I would want to sit in the middle or window seat.

The best airline I have ever travel , really good customer service, attention and service !!

United could have one single once of customer service. No human United employee would help me with the invalid mileage plus number, they said I had to speak with the computer.

United sent me a mileage plus number last year but that number is invalid so I can’t use it to check into flights or collect mileage. There is human to speak about the problem, only computers who keep asking me if I am using the correct email. It’s so frustrating and I cannot resolve it.

It was delayed instead of departing at 9:20pm, we departed at 11pm… putting us in Columbus after 2am! It was awful. Had I known about the delay, I could have spent some time in the United Lounge… I was starving because I started my journey in Budapest… so I was exhausted and hungry. Plus I had to make new arrangements to be picked up at the airport in Columbus, instead of midnight it was 2:30 am after getting luggage and out of airport. Not feasible. I would have just stayed in Chicago for the night and gotten a morning flight.

Very poor delay in dfw was really bad n long

Our flight was 1.5 hours delayed. There was no weather for the inbound flight, so I don't understand why. This meant a VERY late arrival and only a quick nap before my morning flight.

Because of rescheduling, they had to put me on a flight that didn't go through Dallas

It was very difficult to stretch my knee out and I am very short. I also had a torn tendon in my knee which made it extra uncomfortable anyways. My husband is 6'2" and I can't imagine him flying in that plane.

3 hour weather delay followed by 1 hour (and counting) maintenance delay. UGH!

Couldn’t get the door on the plane to close leading to a nearly 2 hour delay. But, hey at least they didn’t cancel the flight.

Flight was cancelled 3 hrs AFTER etd. Thetefore Missed connection from JFK to New Zealand . No accommodation provided… This cost ne aporox 1000 USD in extra expenses and turned whst should have been a 24 hr trip ftom Boston - New Zealand into a VERY expensive , late 70+ hr nightmare … Complete nonsense!!!

After we'd boarded , they canceled the flight. The crew didn't even know , we just all received text messages. Then after they deplaned us , AA was just like "too bad, go F your self, we sure ain't gonna help you"

The plane was broken so we had to change planes.

The flight got delayed 2.5 hrs due to a maintenance issue that cause a domino effect. American should have spare planes for when something like this happens.

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

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