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Cheap flights from Illinois to Trieste from $538

This is the cheapest round-trip flight price found by a momondo user in the last 72 hours by searching for a flight from Illinois to Trieste departing on 2/25. 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
0 bags

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Find the cheapest flights from Illinois to Trieste

Cheap round-trip flights

Enter your travel dates to find the best prices.
Multiple Airlines Logo
4:05 pm - 10:40 pm
STL
-
TRS
23h 35m2 stops
Multiple Airlines Logo
2:40 pm - 3:29 pm
TRS
-
STL
31h 49m2 stops
$538Multiple Airlines
Wed, Feb 25 - Wed, Mar 4
ITA Airways Logo
9:17 am - 10:25 am
ORD
-
TRS
18h 08m2 stops
ITA Airways Logo
6:35 am - 5:35 pm
TRS
-
ORD
18h 00m2 stops
$845ITA Airways
Wed, Mar 4 - Sun, Mar 8
Turkish Airlines Logo
11:50 am - 10:55 pm
ORD
-
TRS
28h 05m2 stops
Turkish Airlines Logo
3:15 pm - 10:05 am
TRS
-
ORD
25h 50m2 stops
$1,017Turkish Airlines
Sat, Feb 7 - Sat, Feb 14
Turkish Airlines Logo
8:20 pm - 10:55 pm
ORD
-
TRS
19h 35m2 stops
Turkish Airlines Logo
6:35 am - 10:05 am
TRS
-
ORD
34h 30m2 stops
$1,057Turkish Airlines
Sat, Feb 7 - Sat, Feb 14
Turkish Airlines Logo
9:20 pm - 2:30 pm
ORD
-
TRS
35h 10m2 stops
Turkish Airlines Logo
11:15 am - 11:05 am
TRS
-
ORD
29h 50m2 stops
$1,216Turkish Airlines
Fri, Mar 13 - Sat, Mar 21
Multiple Airlines Logo
4:05 pm - 6:30 pm
STL
-
TRS
19h 25m2 stops
Multiple Airlines Logo
2:40 pm - 4:23 pm
TRS
-
STL
32h 43m3 stops
$1,304Multiple Airlines
Wed, Feb 25 - Wed, Mar 4
Turkish Airlines Logo
11:25 am - 10:55 pm
ORD
-
TRS
28h 30m2 stops
Turkish Airlines Logo
3:15 pm - 6:15 pm
TRS
-
ORD
34h 00m2 stops
$1,358Turkish Airlines
Tue, Jun 16 - Thu, Jun 18
ITA Airways Logo
3:00 pm - 2:30 pm
ORD
-
TRS
16h 30m1 stop
ITA Airways Logo
6:35 am - 1:10 pm
TRS
-
ORD
13h 35m1 stop
$1,400ITA Airways
Fri, Jun 26 - Sun, Jul 5
United Airlines Logo
3:45 pm - 10:25 am
ORD
-
TRS
11h 40m1 stop
United Airlines Logo
6:35 am - 1:10 pm
TRS
-
ORD
13h 35m1 stop
$1,465United Airlines
Wed, Mar 4 - Sun, Mar 8
United Airlines Logo
12:00 pm - 10:25 am
ORD
-
TRS
15h 25m2 stops
United Airlines Logo
6:35 am - 1:10 pm
TRS
-
ORD
13h 35m1 stop
$1,470United Airlines
Wed, Mar 4 - Sun, Mar 8

Lufthansa flights from Illinois to Trieste

Our best Lufthansa deals on Illinois to Trieste flight tickets
Lufthansa
Apr 10
ORD2:30 pmChicago O'Hare Intl
16h 25m
2 stops
TRS1:55 pmTrieste Ronchi dei Legionari
Apr 24
TRS6:00 amTrieste Ronchi dei Legionari
13h 55m
1 stop
ORD12:55 pmChicago O'Hare Intl
$861
Lufthansa
Apr 10
ORD4:05 pmChicago O'Hare Intl
14h 50m
1 stop
TRS1:55 pmTrieste Ronchi dei Legionari
Apr 24
TRS6:00 amTrieste Ronchi dei Legionari
13h 55m
1 stop
ORD12:55 pmChicago O'Hare Intl
$932

Turkish Airlines flights from Illinois to Trieste

Our best Turkish Airlines deals on Illinois to Trieste flight tickets
Turkish Airlines
Feb 7
ORD8:20 pmChicago O'Hare Intl
19h 35m
2 stops
TRS10:55 pmTrieste Ronchi dei Legionari
Feb 14
TRS6:35 amTrieste Ronchi dei Legionari
34h 30m
2 stops
ORD10:05 amChicago O'Hare Intl
$1,057
Turkish Airlines
Mar 13
ORD9:20 pmChicago O'Hare Intl
35h 10m
2 stops
TRS2:30 pmTrieste Ronchi dei Legionari
Mar 21
TRS11:15 amTrieste Ronchi dei Legionari
29h 50m
2 stops
ORD11:05 amChicago O'Hare Intl
$1,216
Turkish Airlines
Jun 16
ORD11:25 amChicago O'Hare Intl
28h 30m
2 stops
TRS10:55 pmTrieste Ronchi dei Legionari
Jun 18
TRS3:15 pmTrieste Ronchi dei Legionari
34h 00m
2 stops
ORD6:15 pmChicago O'Hare Intl
$1,358

momondo Fare Finder

 
Customize your flight search to find flights from Illinois 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 January 11, 2026.
Use the filters below to find and compare flights from Illinois to Trieste that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

St. LouisTrieste

STL - TRS

STLTRS

Lambert-St Louis

Wed 2/25

4:05 pm-10:40 pm

2 stops23h 35m

Trieste Ronchi dei Legionari

Wed 3/4

2:40 pm-3:29 pm

2 stops31h 49m

$538

ChicagoTrieste

ORD - TRS

ORDTRS

Chicago O'Hare Intl

Wed 3/4

9:17 am-10:25 am

2 stops18h 08m

Trieste Ronchi dei Legionari

Sun 3/8

6:35 am-5:35 pm

2 stops18h 00m

$845

ChicagoTrieste

ORD - TRS

ORDTRS

Chicago O'Hare Intl

Sat 2/7

11:50 am-10:55 pm

2 stops28h 05m

Trieste Ronchi dei Legionari

Sat 2/14

3:15 pm-10:05 am

2 stops25h 50m

$1,017

ChicagoTrieste

ORD - TRS

ORDTRS

Chicago O'Hare Intl

Sat 2/7

8:20 pm-10:55 pm

2 stops19h 35m

Trieste Ronchi dei Legionari

Sat 2/14

6:35 am-10:05 am

2 stops34h 30m

$1,057

ChicagoTrieste

ORD - TRS

ORDTRS

Chicago O'Hare Intl

Fri 3/13

9:20 pm-2:30 pm

2 stops35h 10m

Trieste Ronchi dei Legionari

Sat 3/21

11:15 am-11:05 am

2 stops29h 50m

$1,216

St. LouisTrieste

STL - TRS

STLTRS

Lambert-St Louis

Wed 2/25

4:05 pm-6:30 pm

2 stops19h 25m

Trieste Ronchi dei Legionari

Wed 3/4

2:40 pm-4:23 pm

3 stops32h 43m

$1,304

ChicagoTrieste

ORD - TRS

ORDTRS

Chicago O'Hare Intl

Tue 6/16

11:25 am-10:55 pm

2 stops28h 30m

Trieste Ronchi dei Legionari

Thu 6/18

3:15 pm-6:15 pm

2 stops34h 00m

$1,358

ChicagoTrieste

ORD - TRS

ORDTRS

Chicago O'Hare Intl

Fri 6/26

3:00 pm-2:30 pm

1 stop16h 30m

Trieste Ronchi dei Legionari

Sun 7/5

6:35 am-1:10 pm

1 stop13h 35m

$1,400

ChicagoTrieste

ORD - TRS

ORDTRS

Chicago O'Hare Intl

Wed 3/4

3:45 pm-10:25 am

1 stop11h 40m

Trieste Ronchi dei Legionari

Sun 3/8

6:35 am-1:10 pm

1 stop13h 35m

$1,465

ChicagoTrieste

ORD - TRS

ORDTRS

Chicago O'Hare Intl

Wed 3/4

12:00 pm-10:25 am

2 stops15h 25m

Trieste Ronchi dei Legionari

Sun 3/8

6:35 am-1:10 pm

1 stop13h 35m

$1,470

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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How to get the cheapest flight ticket from Illinois 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

Can stopping save me money on Illinois to Trieste flights?

You could potentially save up to 62% on your flight if you consider stops on a Illinois to Trieste flight.

Cheap Illinois to Trieste flight deals and tips

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

Fastest flight time

11h 40m

Direct flights

None
The fastest flight from Illinois to Trieste takes 11h 40m
There are no direct flights from Illinois to Trieste. There are no popular flight routes from Illinois to Trieste.
Search flight deals

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

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

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

    Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Illinois to Trieste Ronchi dei Legionari Airport.

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

    The required travel and health documents for your Trieste Ronchi dei Legionari Airport trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at Trieste Ronchi dei Legionari Airport. We recommend that you seek guidance from your airline or a reliable third party such as IATA.

Traveling to a place near Trieste?

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

Why use momondo?

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

We help find the flight that best suits your needs, momondo compares prices from hundreds of airlines and travel agents and helps you filter them to find the best flight from Illinois to Trieste for you.

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

Yes. momondo allows you to filter the results for Illinois to Trieste flights to just show those with flexible booking policies.

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

momondo offers useful filters to help you find the right flight. Choose specific flight times, airports or even what payment method you prefer. We have numerous options to help you book your ideal flight from Illinois to Trieste.

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

If you are not ready to book a flight from Illinois to Trieste now, use our insights above to find helpful tips or alternatively set up a price alert, where momondo will track prices on flights to Trieste and let you know when they change.

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Tue 2/10
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Fly your favorite airline to Trieste

Airlines are sorted and displayed according to clicks in the past 7 days on momondo
Turkish Airlines
Lufthansa
Scandinavian Airlines
United Airlines
ITA Airways
Aer Lingus
SWISS
Iberia
TAP AIR PORTUGAL
British Airways
American Airlines