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Cheap flights from Missouri to Trieste from $619

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Missouri to Trieste departing on 9/15. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
1 adult, Economy, 0 bags

Find the cheapest flights from Missouri to Trieste

Cheap round-trip flights

Enter your travel dates to find the best prices.
Multiple Airlines Logo
2:40 pm - 9:55 pmSTL  Lambert-St Louis-TRS Trieste Ronchi dei Legionari
24h 15m2 stops Toronto Pearson Intl Frankfurt am Main
Multiple Airlines Logo
6:20 am - 1:25 pmTRS  Trieste Ronchi dei Legionari-STL Lambert-St Louis
14h 05m1 stop Frankfurt am Main
$1,099Multiple Airlines
Fri, Sep 25 - Tue, Sep 29
Multiple Airlines Logo
8:55 am - 9:55 pmSTL  Lambert-St Louis-TRS Trieste Ronchi dei Legionari
30h 00m2 stops Toronto Pearson Intl Frankfurt am Main
Multiple Airlines Logo
6:20 am - 1:25 pmTRS  Trieste Ronchi dei Legionari-STL Lambert-St Louis
14h 05m1 stop Frankfurt am Main
$1,107Multiple Airlines
Fri, Sep 18 - Tue, Sep 29
Multiple Airlines Logo
8:55 am - 9:55 pmSTL  Lambert-St Louis-TRS Trieste Ronchi dei Legionari
30h 00m2 stops Toronto Pearson Intl Frankfurt am Main
Multiple Airlines Logo
6:20 am - 2:00 pmTRS  Trieste Ronchi dei Legionari-STL Lambert-St Louis
38h 40m2 stops Frankfurt am Main Toronto Pearson Intl
$1,115Multiple Airlines
Fri, Sep 18 - Tue, Sep 29
United Airlines Logo
6:30 am - 10:25 amSTL  Lambert-St Louis-TRS Trieste Ronchi dei Legionari
20h 55m2 stops Newark Rome Fiumicino
United Airlines Logo
6:35 am - 6:38 pmTRS  Trieste Ronchi dei Legionari-STL Lambert-St Louis
19h 03m2 stops Rome Fiumicino Washington, D.C. Dulles Intl
$1,122United Airlines
Sun, Jan 10 - Wed, Jan 13
United Airlines Logo
8:00 am - 10:25 amMCI  Kansas City-TRS Trieste Ronchi dei Legionari
19h 25m2 stops Chicago O'Hare Intl Rome Fiumicino
United Airlines Logo
6:35 am - 7:32 pmTRS  Trieste Ronchi dei Legionari-MCI Kansas City
19h 57m2 stops Rome Fiumicino Washington, D.C. Dulles Intl
$1,170United Airlines
Sun, Dec 6 - Wed, Dec 9
Multiple Airlines Logo
12:10 pm - 10:55 pmSTL  Lambert-St Louis-TRS Trieste Ronchi dei Legionari
27h 45m3 stops Montreal Pierre Elliott Trudeau Intl Barcelona-El Prat Rome Fiumicino
Multiple Airlines Logo
10:15 pm - 8:20 pmTRS  Trieste Ronchi dei Legionari-STL Lambert-St Louis
29h 05m3 stops London Stansted Zurich Toronto Pearson Intl
$1,228Multiple Airlines
Fri, Sep 25 - Tue, Sep 29
Lufthansa Logo
3:30 pm - 9:55 pmSTL  Lambert-St Louis-TRS Trieste Ronchi dei Legionari
23h 25m1 stop Frankfurt am Main
Lufthansa Logo
6:20 am - 1:25 pmTRS  Trieste Ronchi dei Legionari-STL Lambert-St Louis
14h 05m1 stop Frankfurt am Main
$1,255Lufthansa
Fri, Sep 18 - Tue, Sep 29
United Airlines Logo
11:50 am - 10:25 amMCI  Kansas City-TRS Trieste Ronchi dei Legionari
15h 35m2 stops Washington, D.C. Dulles Intl Rome Fiumicino
United Airlines Logo
6:35 am - 7:46 pmTRS  Trieste Ronchi dei Legionari-MCI Kansas City
20h 11m2 stops Rome Fiumicino Washington, D.C. Dulles Intl
$1,272United Airlines
Wed, Sep 30 - Wed, Oct 7
Multiple Airlines Logo
12:10 pm - 6:30 pmSTL  Lambert-St Louis-TRS Trieste Ronchi dei Legionari
23h 20m3 stops Montreal Pierre Elliott Trudeau Intl Barcelona-El Prat Rome Fiumicino
Multiple Airlines Logo
10:15 pm - 2:00 pmTRS  Trieste Ronchi dei Legionari-STL Lambert-St Louis
22h 45m2 stops London Stansted Toronto Pearson Intl
$1,341Multiple Airlines
Fri, Sep 25 - Tue, Sep 29
Multiple Airlines Logo
12:10 pm - 10:55 pmSTL  Lambert-St Louis-TRS Trieste Ronchi dei Legionari
27h 45m3 stops Montreal Pierre Elliott Trudeau Intl Paris Charles de Gaulle Rome Fiumicino
Multiple Airlines Logo
10:15 pm - 8:20 pmTRS  Trieste Ronchi dei Legionari-STL Lambert-St Louis
29h 05m3 stops London Stansted Zurich Toronto Pearson Intl
$1,342Multiple Airlines
Fri, Sep 18 - Tue, Sep 29

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United Airlines flights from Missouri to Trieste

Our best United Airlines deals on Missouri to Trieste flight tickets
United Airlines
Jan 10
STL6:30 amLambert-St Louis
20h 55m
2 stops
TRS10:25 amTrieste Ronchi dei Legionari
Jan 13
TRS6:35 amTrieste Ronchi dei Legionari
19h 03m
2 stops
STL6:38 pmLambert-St Louis
$1,122
United Airlines
Dec 6
MCI8:00 amKansas City
19h 25m
2 stops
TRS10:25 amTrieste Ronchi dei Legionari
Dec 9
TRS6:35 amTrieste Ronchi dei Legionari
19h 57m
2 stops
MCI7:32 pmKansas City
$1,170
United Airlines
Sep 30
MCI11:50 amKansas City
15h 35m
2 stops
TRS10:25 amTrieste Ronchi dei Legionari
Oct 7
TRS6:35 amTrieste Ronchi dei Legionari
20h 11m
2 stops
MCI7:46 pmKansas City
$1,272

Lufthansa flights from Missouri to Trieste

Our best Lufthansa deals on Missouri to Trieste flight tickets
Lufthansa
Sep 18
STL3:30 pmLambert-St Louis
23h 25m
1 stop
TRS9:55 pmTrieste Ronchi dei Legionari
Sep 29
TRS6:20 amTrieste Ronchi dei Legionari
14h 05m
1 stop
STL1:25 pmLambert-St Louis
$1,255
Lufthansa
Sep 9
MCI5:39 pmKansas City
37h 16m
2 stops
TRS1:55 pmTrieste Ronchi dei Legionari
Sep 25
TRS6:10 amTrieste Ronchi dei Legionari
20h 36m
2 stops
MCI7:46 pmKansas City
$5,618
Lufthansa
Sep 10
MCI11:10 amKansas City
19h 45m
2 stops
TRS1:55 pmTrieste Ronchi dei Legionari
Sep 26
TRS6:15 amTrieste Ronchi dei Legionari
16h 38m
2 stops
MCI3:53 pmKansas City
$5,956

momondo Fare Finder

 
Customize your flight search to find flights from Missouri to Trieste 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, momondo users made 832,500 searches. Data last updated August 17, 2026.
Use the filters below to find and compare flights from Missouri to Trieste that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

St. LouisTrieste

STL Lambert-St Louis - TRS Trieste Ronchi dei Legionari

STLTRS

Lambert-St Louis

Fri 9/25

2:40 pm-9:55 pm

2 stops24h 15m

Trieste Ronchi dei Legionari

Tue 9/29

6:20 am-1:25 pm

1 stop14h 05m

$1,099

St. LouisTrieste

STL Lambert-St Louis - TRS Trieste Ronchi dei Legionari

STLTRS

Lambert-St Louis

Fri 9/18

8:55 am-9:55 pm

2 stops30h 00m

Trieste Ronchi dei Legionari

Tue 9/29

6:20 am-1:25 pm

1 stop14h 05m

$1,107

St. LouisTrieste

STL Lambert-St Louis - TRS Trieste Ronchi dei Legionari

STLTRS

Lambert-St Louis

Fri 9/18

8:55 am-9:55 pm

2 stops30h 00m

Trieste Ronchi dei Legionari

Tue 9/29

6:20 am-2:00 pm

2 stops38h 40m

$1,115

St. LouisTrieste

STL Lambert-St Louis - TRS Trieste Ronchi dei Legionari

STLTRS

Lambert-St Louis

Sun 1/10

6:30 am-10:25 am

2 stops20h 55m

Trieste Ronchi dei Legionari

Wed 1/13

6:35 am-6:38 pm

2 stops19h 03m

$1,122

Kansas CityTrieste

MCI Kansas City - TRS Trieste Ronchi dei Legionari

MCITRS

Kansas City

Sun 12/6

8:00 am-10:25 am

2 stops19h 25m

Trieste Ronchi dei Legionari

Wed 12/9

6:35 am-7:32 pm

2 stops19h 57m

$1,170

St. LouisTrieste

STL Lambert-St Louis - TRS Trieste Ronchi dei Legionari

STLTRS

Lambert-St Louis

Fri 9/25

12:10 pm-10:55 pm

3 stops27h 45m

Trieste Ronchi dei Legionari

Tue 9/29

10:15 pm-8:20 pm

3 stops29h 05m

$1,228

St. LouisTrieste

STL Lambert-St Louis - TRS Trieste Ronchi dei Legionari

STLTRS

Lambert-St Louis

Fri 9/18

3:30 pm-9:55 pm

1 stop23h 25m

Trieste Ronchi dei Legionari

Tue 9/29

6:20 am-1:25 pm

1 stop14h 05m

$1,255
Quickest round-trip

Kansas CityTrieste

MCI Kansas City - TRS Trieste Ronchi dei Legionari

MCITRS

Kansas City

Wed 9/30

11:50 am-10:25 am

2 stops15h 35m

Trieste Ronchi dei Legionari

Wed 10/7

6:35 am-7:46 pm

2 stops20h 11m

$1,272

St. LouisTrieste

STL Lambert-St Louis - TRS Trieste Ronchi dei Legionari

STLTRS

Lambert-St Louis

Fri 9/25

12:10 pm-6:30 pm

3 stops23h 20m

Trieste Ronchi dei Legionari

Tue 9/29

10:15 pm-2:00 pm

2 stops22h 45m

$1,341

St. LouisTrieste

STL Lambert-St Louis - TRS Trieste Ronchi dei Legionari

STLTRS

Lambert-St Louis

Fri 9/18

12:10 pm-10:55 pm

3 stops27h 45m

Trieste Ronchi dei Legionari

Tue 9/29

10:15 pm-8:20 pm

3 stops29h 05m

$1,342

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 11 resultsSorted by cheapest first
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See travel insights to Trieste from

How to get the cheapest flight ticket from Missouri to Trieste

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the cheapest airline that flies from Missouri to Trieste Ronchi dei Legionari?

United Airlines is the most popular carrier operating from Missouri to Trieste Ronchi dei Legionari

What airlines fly to Trieste?

United Airlines, Lufthansa and Delta are the top three most popular airlines that fly to Trieste from Missouri according to our data. United Airlines is the first choice among our users, with 36% of people opting to fly with this airline when traveling to Trieste. Keep in mind that there are 5 different airlines that fly to Trieste on a routine basis, so you have a few additional options to choose from.

Cheap Missouri to Trieste flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Missouri to Trieste

Fastest flight time

15h 35m

Direct flights

None
The fastest flight from Missouri to Trieste takes 15h 35m
There are no direct flights from Missouri to Trieste. There are no popular flight routes from Missouri to Trieste.
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Frequently asked questions about flying from Missouri to Trieste

  • When did momondo last update prices for flights from Missouri to Trieste Ronchi dei Legionari Airport?

    Prices for flights from Missouri to Trieste Ronchi dei Legionari Airport are updated daily.

  • How old do you have to be to fly from Missouri to Trieste Ronchi dei Legionari Airport?

    The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Missouri to Trieste Ronchi dei Legionari Airport.

  • What documentation or ID do you need to fly to Trieste Ronchi dei Legionari Airport?

    The travel and health documents required for your trip to Trieste Ronchi dei Legionari Airport can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at Trieste Ronchi dei Legionari Airport. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

Traveling to a place near Trieste?

Book flights to Trieste if you plan to visit one of these locations
Grado
Udine

Why use momondo?

Why should I use momondo to find a flight deal from Missouri to Trieste?

It is quick and easy to find Missouri to Trieste flights on momondo. We search and return numerous flight options from various airlines and agents. You can then use our filters to narrow your search until you have found the most convenient flight to Trieste that suits you.

Can I find flights from Missouri to Trieste with flexible booking policies on momondo?

Yes. All flights to Trieste from Missouri on momondo can be compared and filtered by various policies on offer, including flexible booking.

How can momondo help me find flights from Missouri to Trieste?

momondo provides multiple filters to help you find the best flight to Trieste from Missouri. Filter by price, airline, airports, cabin, aircraft, payment method, number of stops and more.

I’m not ready to book a flight from Missouri to Trieste right now. Can momondo alert me if prices change?

Yes momondo offers price alerts on flights to Trieste from Missouri. After performing a search on this page you should be able to see the price alert set up feature. Simply provide a valid email address and momondo will instantly alert you when prices change.

An easier way to manage your Trieste trip

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Airlines are sorted and displayed according to clicks in the past 7 days on momondo
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Delta
British Airways
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