STL - SNN

$636 Find Cheap Flights from St. Louis to Shannon - Compare and Save

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1 adult, Economy, 0 bags

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Everything you should know

Cheapest round-trip
$728
Typical prices: $738-$1,080
United Airlines
Sat 4/28Sat 5/12
STL - SNN • 1 stop
Cheapest one-way
$636
Typical prices: $479-$1,172
British Airways
Mon 11/12
STL - SNN • 2 stops
When to travel
December
Cheapest • 42% price drop
August
Most popular
Good to know
+1
Good to know
+1
Top layover airports
Chicago O'Hare Intl (ORD)
Cheapest • Avg $865 (round-trip)
Newark (EWR)
Shortest trip • 12h 28m (one-way)
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Flight Deals

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

 
Discover the best prices for you by selecting your travel dates on KAYAK.

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

Wed, Apr 28 - Wed, May 12
United Airlines Logo
9:23 am - 10:15 amSTL  Lambert-St Louis-SNN Shannon
18h 52m2 stops Chicago O'Hare Intl Newark
United Airlines Logo
12:30 pm - 10:06 pmSNN  Shannon-STL Lambert-St Louis
15h 36m2 stops Newark Houston George Bush Intcntl
$728United Airlines
Wed, Apr 28 - Wed, May 12
United Airlines Logo
11:45 am - 10:15 amSTL  Lambert-St Louis-SNN Shannon
16h 30m1 stop Newark
United Airlines Logo
12:30 pm - 10:06 pmSNN  Shannon-STL Lambert-St Louis
15h 36m2 stops Newark Houston George Bush Intcntl
$728United Airlines
Sat, Apr 17 - Tue, Apr 20
United Airlines Logo
4:30 pm - 10:15 amSTL  Lambert-St Louis-SNN Shannon
35h 45m2 stops Denver Intl Newark
United Airlines Logo
12:30 pm - 11:25 pmSNN  Shannon-STL Lambert-St Louis
16h 55m1 stop Newark
$739United Airlines
Sat, Apr 17 - Wed, Apr 21
United Airlines Logo
4:30 pm - 10:15 amSTL  Lambert-St Louis-SNN Shannon
35h 45m2 stops Denver Intl Newark
United Airlines Logo
12:30 pm - 10:54 pmSNN  Shannon-STL Lambert-St Louis
16h 24m2 stops Newark Chicago O'Hare Intl
$739United Airlines
Sat, Apr 17 - Wed, Apr 21
United Airlines Logo
4:17 pm - 10:15 amSTL  Lambert-St Louis-SNN Shannon
35h 58m2 stops Houston George Bush Intcntl Newark
United Airlines Logo
12:30 pm - 11:25 pmSNN  Shannon-STL Lambert-St Louis
16h 55m1 stop Newark
$739United Airlines
Sat, Apr 17 - Tue, Apr 20
United Airlines Logo
4:30 pm - 10:15 amSTL  Lambert-St Louis-SNN Shannon
35h 45m2 stops Denver Intl Newark
United Airlines Logo
12:30 pm - 10:54 pmSNN  Shannon-STL Lambert-St Louis
16h 24m2 stops Newark Chicago O'Hare Intl
$739United Airlines
Wed, Apr 28 - Wed, May 12
Lufthansa Logo
11:45 am - 10:15 amSTL  Lambert-St Louis-SNN Shannon
16h 30m1 stop Newark
Lufthansa Logo
12:30 pm - 11:25 pmSNN  Shannon-STL Lambert-St Louis
16h 55m1 stop Newark
$882Lufthansa
Tue, Mar 23 - Mon, Mar 29
Multiple Airlines Logo
4:05 pm - 4:45 pmSTL  Lambert-St Louis-SNN Shannon
19h 40m2 stops Toronto Pearson Intl London Heathrow
Multiple Airlines Logo
9:15 pm - 3:26 pmSNN  Shannon-STL Lambert-St Louis
24h 11m2 stops London Heathrow Toronto Pearson Intl
$928Multiple Airlines
Tue, Mar 23 - Mon, Mar 29
Multiple Airlines Logo
4:05 pm - 4:45 pmSTL  Lambert-St Louis-SNN Shannon
19h 40m2 stops Toronto Pearson Intl London Heathrow
Multiple Airlines Logo
9:15 pm - 3:26 pmSNN  Shannon-STL Lambert-St Louis
24h 11m2 stops London Heathrow Toronto Pearson Intl
$938Multiple Airlines
Tue, Mar 23 - Mon, Mar 29
Multiple Airlines Logo
10:30 am - 5:50 amSTL  Lambert-St Louis-SNN Shannon
14h 20m1 stop Boston Logan Intl
Multiple Airlines Logo
9:15 pm - 7:30 pmSNN  Shannon-STL Lambert-St Louis
28h 15m1 stop London Heathrow
$957Multiple Airlines
Booking Insights

Price, demand and travel trends for St. Louis to Shannon flights

Use KAYAK data on prices, travel dates, airlines and seasonal trends to compare options and book flights with more confidence.

How much is a round-trip flight from St. Louis to Shannon?

Round-trip flights from St. Louis to Shannon typically range from $738 to $1,080. The lowest price found in the past 5 days was $728, on United Airlines.

What's the cheapest day of the week to fly from St. Louis to Shannon?

Based on deals KAYAK users found in the last 12 months, Tuesday is the cheapest day of the week to fly from St. Louis to Shannon. It’s 9% cheaper than the average day, while Monday is the most expensive, with prices 55% higher.

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Key details for St. Louis to Shannon flights

Low season

January

Cheapest flight

$636
Beat the crowds with an average 95% drop in travelers.
The most popular month to fly with an average 128% increase in travelers.
One-way 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

Your St. Louis to Shannon flight questions, answered

Find helpful answers about this route, including flight times, airports, airlines and booking tips.

  • What cabin classes can I book on flights from St. Louis to Shannon?

    Two cabin classes are available on flights from St. Louis to Shannon:

    • Economy Class
    • Business Class

  • How long is a flight from St. Louis to Shannon?

    There are currently no nonstop flights available from St. Louis to Shannon. Flights with 1 layover take between 11h 29m and 19h 34m in total, depending on the connection.

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

    Yes, a valid passport is required for this international route. Many destinations require at least six months of validity beyond your travel dates. Check your passport expiry well before booking.

  • How much should I expect to pay for a St. Louis to Shannon flight?

    Round-trip flights from St. Louis to Shannon range from $738 to $1,080, with an average of $837 over the past 12 months. Anything below $738 counts as a good deal.

  • Have flight prices from St. Louis to Shannon changed much recently?

    Yes. Based on fares seen in the past 5 days, round-trip prices on this route showed a wide range, from about $728 to $2,042. That means the highest observed fare was about 3x higher than the lowest one.

  • How are flight prices from St. Louis to Shannon looking right now?

    One-way fares from St. Louis to Shannon are currently lower than usual. Average one-way flight prices are about $636, which is 12% below the typical average for this route.

  • What car rental options are available at Shannon Airport (SNN)?

    Shannon Airport (SNN) hosts 5 major car rental companies, with daily rates averaging $33 for economy cars. Top options include:

    • Budget
    • Sixt
    • Europcar
    • Easirent
    • Thrifty

  • Which airports can I use when flying from St. Louis to Shannon?

    Flights from St. Louis to Shannon usually depart from Lambert-St Louis (STL) and arrive at Shannon (SNN).

  • Which airports do connecting flights from St. Louis to Shannon pass through?

    One-stop flights from St. Louis to Shannon most commonly connect through:

    • Chicago O'Hare Intl (ORD) - 79% of one-stop connections
    • Newark (EWR) - 19% of one-stop connections
    • Boston Logan Intl (BOS) - 2% of one-stop connections

  • Can I save money by using flexible dates for flights from St. Louis to Shannon?

    Yes. Flexible dates can save you up to 41% on flights from St. Louis to Shannon. Tuesday is the cheapest departure day at $770 round-trip on average, while Monday is the most expensive at $1,305, a difference of $535.

    KAYAK's flexible dates feature shows options up to 3 days before and after your selected dates, making it easier to compare nearby fares.

  • How much time can I save by choosing a different layover airport from St. Louis to Shannon?

    Flying via Chicago O'Hare Intl (ORD) gives the shortest average 1-stop total travel time at 11h 29m, compared with 12h 28m via Newark (EWR) and 19h 34m via Boston Logan Intl (BOS).

  • What is the time difference between St. Louis and Shannon?

    Shannon is 5 hours ahead of St. Louis (Irish Time vs Central Time). Plan for the time shift when scheduling connections or first-day activities.

Your guide to booking St. Louis to Shannon flights

Get tips on when to book, when to fly and what to know before your trip.
  • If your dates are flexible, aim for a Tuesday departure and avoid flying on Monday. On this route, Tuesday flights average $770, about $535 less than Monday fares (41% savings) based on the last 12 months.
  • If you can choose when to travel, plan your St. Louis to Shannon trip for December. Fares historically average $483 round-trip in that month - typically $743 less than the most expensive month, which is June (based on the last 12 months).
  • If you're arriving late at night and need somewhere to stay, check out these hotels close to Shannon Airport.

    • Park Inn by Radisson Shannon Airport
    • Treacys Oakwood Hotel
    • Carrygerry Country House

More options for your flight from St. Louis to Shannon

Complete your trip to Shannon with a hotel stay or car rental

Car rentals in Shannon
Hotels in Shannon