$500 Cheap Flights from St. Louis (STL) to Trieste (TRS)

View $500 flight on Tue, Oct 14, 2025Opens in a new window

Popular airlines from St. Louis Lambert Intl. Airport (STL) to Friuli Venezia Giulia Airport (TRS)

Cheap Flights from St. Louis to Trieste (STL-TRS)

Prices were available within the past 7 days and start at $500 for one-way flights and $664 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

United
Sun, Mar 1 - Tue, Mar 10
STL
St. Louis
TRS
Trieste
$664 Roundtrip, found 3 days ago
$664
Roundtrip
found 3 days ago
Select United flight, departing Sun, Mar 1 from St. Louis to Trieste, returning Tue, Mar 10, priced at $664 found 3 days ago
Air Canada
Mon, Mar 2 - Tue, Mar 10
STL
St. Louis
TRS
Trieste
$670 Roundtrip, found 3 days ago
$670
Roundtrip
found 3 days ago
Select Air Canada flight, departing Mon, Mar 2 from St. Louis to Trieste, returning Tue, Mar 10, priced at $670 found 3 days ago
United
Sun, Mar 1 - Mon, Mar 9
STL
St. Louis
TRS
Trieste
$683 Roundtrip, found 3 days ago
$683
Roundtrip
found 3 days ago
Select United flight, departing Sun, Mar 1 from St. Louis to Trieste, returning Mon, Mar 9, priced at $683 found 3 days ago
Air Canada
Sun, Mar 1 - Mon, Mar 9
STL
St. Louis
TRS
Trieste
$686 Roundtrip, found 3 days ago
$686
Roundtrip
found 3 days ago
Select Air Canada flight, departing Sun, Mar 1 from St. Louis to Trieste, returning Mon, Mar 9, priced at $686 found 3 days ago
United
Sun, Mar 1 - Mon, Mar 9
STL
St. Louis
TRS
Trieste
$687 Roundtrip, found 3 days ago
$687
Roundtrip
found 3 days ago
Select United flight, departing Sun, Mar 1 from St. Louis to Trieste, returning Mon, Mar 9, priced at $687 found 3 days ago
United
Sun, Mar 1 - Mon, Mar 9
STL
St. Louis
TRS
Trieste
$693 Roundtrip, found 3 days ago
$693
Roundtrip
found 3 days ago
Select United flight, departing Sun, Mar 1 from St. Louis to Trieste, returning Mon, Mar 9, priced at $693 found 3 days ago
Air Canada
Sun, Mar 1 - Mon, Mar 9
STL
St. Louis
TRS
Trieste
$707 Roundtrip, found 3 days ago
$707
Roundtrip
found 3 days ago
Select Air Canada flight, departing Sun, Mar 1 from St. Louis to Trieste, returning Mon, Mar 9, priced at $707 found 3 days ago
KLM
Fri, Feb 27 - Wed, Mar 11
STL
St. Louis
TRS
Trieste
$763 Roundtrip, found 3 days ago
$763
Roundtrip
found 3 days ago
Select KLM flight, departing Fri, Feb 27 from St. Louis to Trieste, returning Wed, Mar 11, priced at $763 found 3 days ago
Lufthansa
Sun, Mar 1 - Mon, Mar 9
STL
St. Louis
TRS
Trieste
$768 Roundtrip, found 3 days ago
$768
Roundtrip
found 3 days ago
Select Lufthansa flight, departing Sun, Mar 1 from St. Louis to Trieste, returning Mon, Mar 9, priced at $768 found 3 days ago
Brussels Airlines
Sun, Apr 26 - Fri, May 8
STL
St. Louis
TRS
Trieste
$1,606 Roundtrip, found 4 days ago
$1,606
Roundtrip
found 4 days ago
Select Brussels Airlines flight, departing Sun, Apr 26 from St. Louis to Trieste, returning Fri, May 8, priced at $1,606 found 4 days ago

Frequently asked questions

How much does a flight from Lambert-St. Louis Intl. Airport (STL) to Friuli Venezia Giulia Airport (TRS) cost?
Snag a cheap one-way flight from $500 or cheap return flight from $664 from Lambert-St. Louis Intl. Airport (STL) to Friuli Venezia Giulia Airport (TRS) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to find our cheapest flight deals on this route.
What is the cheapest month to fly from Lambert-St. Louis Intl. Airport (STL) to Friuli Venezia Giulia Airport (TRS)?
The cheapest month to fly from STL to TRS is March, when demand is low. Off-peak months are often when you'll find lower airfares between these airports.
What is the cheapest airline that flies from Lambert-St. Louis Intl. Airport (STL) to Friuli Venezia Giulia Airport (TRS)?
Expedia's filter tool lets you easily compare different airlines, flight durations and fares all in one place. Choose your preferences, then sort by "Price (lowest to highest)" to see which carrier offers the cheapest STL to TRS flight.
How many flights per day from Lambert-St. Louis Intl. Airport (STL) to Friuli Venezia Giulia Airport (TRS)?
Nonstop flights from Lambert-St. Louis Intl. Airport (STL) to Friuli Venezia Giulia Airport (TRS) aren't available daily, so you'll need to take a flight with a layover. Explore your options with our filter tool. Enter your travel dates and choose either "1 Stop" or "2+ Stops."
What day of the week has the most flights from STL to TRS?
Usually you'll find the greatest selection of flight options on a Friday. Tuesdays tend to be the quietest.* But this can change based on the time of year, airline and other factors.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from Lambert-St. Louis Intl. Airport (STL) to Friuli Venezia Giulia Airport (TRS)?
To avoid potential delays on the Lambert-St. Louis Intl. Airport (STL) to Friuli Venezia Giulia Airport (TRS) route, aim to travel before 3 PM. Departures after this time are 22% more likely to be canceled.**Most reliable time of the day and month to travel recommendation is based on January through August 2024 flight status data sourced from OAG's global flight data platform.
Is it cheaper to buy a plane ticket from Lambert-St. Louis Intl. Airport (STL) to Friuli Venezia Giulia Airport (TRS) last-minute?
Last-minute fares from STL to TRS are usually more expensive. For the lowest rates, start looking for flights well in advance. That said, if you're flexible with your travel plans, it's possible to score a cheap ticket right before you leave.
Is it cheaper to book a STL to TRS flight and hotel package?
Opting for a STL to TRS flight and hotel package is typically cheaper than booking separately. With Expedia, you can enjoy the ease of organizing your travels all in one place. Pick from our extensive range of stays and then add flights, car rentals and activities to your booking. Bundle everything together, and you could save hundreds of dollars.
Can I cancel or change the date of my flight from Lambert-St. Louis Intl. Airport (STL) to Friuli Venezia Giulia Airport (TRS)?
In most instances, you're able to reschedule or cancel your STL to TRS flight. However, additional charges may apply, especially if you made your booking more than 24 hours ago. Double-check your itinerary for the airline's rules and fees on flight changes, or if you need more details, visit our Customer Service portal.

Travel information

Travel information

Origin airport
Lambert-St. Louis Intl.
Destination airport
Friuli Venezia Giulia
Roundtrip price
$663
Distance
4934 mi

Book with confidence

Book with confidence

St. Louis to Trieste Flights

The cheapest times to fly from St. Louis to Trieste

On average, Thursday can be the cheapest time to fly, according to data from the Airlines Reporting Corporation (ARC), one of the world's biggest databases for global airline sales. The data reveals that you could save up to 16% by flying on a Thursday—the cheapest day to travel on average—instead of a Sunday—the most expensive. Some of the most affordable flights from St. Louis to Trieste are during the month of March. You can find some of the cheapest flights from St. Louis to Trieste with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from St. Louis to Trieste

Sunday is one of the best days to book for cheap flights from St. Louis to Trieste: Tickets reserved on a Sunday cost between 6% and 13% less than those reserved on a Friday, according to ARC data. The data also suggests booking early can also lead to cheaper airfares. You could save 24% by buying your tickets for domestic flights at least a month in advance and 10% by booking international flights 2 months in advance.

 

How to find cheap round-trip tickets from St. Louis to Trieste

Being flexible with your dates and using Expedia's Price Drop Protection and Price Tracking features are some of the best ways of finding a cheap ticket from St. Louis to Trieste in 2025. You can also book with separate airlines for your outbound and return journeys, from $500 one-way. Expedia also offers Price Drop Protection, so if the cost of your airfare goes down after booking, you'll receive a credit for the difference*. This is available for a small fee, and is free to One Key Gold and Platinum tier members.

 

Expedia's Price Tracking feature means you can stay on top of airfares without manually checking every day. It sends you automated price alerts for cheap St. Louis to Trieste flights and uses historical data to indicate when the best time to book is. Download Expedia's free app to activate this handy tool in a few easy taps.

 

You could also save big by booking one of Expedia's vacation packages. Bundling together your St. Louis to Trieste airfare with your accommodations and car rental is often cheaper than booking everything separately. There’s also One Key, Expedia's generous rewards program. Join for free and you could earn One Key cash on most bookings to save on future adventures.

 

*Terms apply.

 

Disclaimer: ARC The statistics are based on average round-trip ticket prices between January and August 2023. The percentages you see are averages.

 

St. Louis to Trieste Flights

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*Available to One Key members.