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Cheap flights from Illinois to Trieste from $437

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Illinois to Trieste departing on 6/7. 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 - 1:45 pm
STL
-
TRS
14h 40m
2 stops
Multiple Airlines Logo
6:20 am - 3:25 pm
TRS
-
STL
16h 05m
2 stops
$763Multiple Airlines
Tue, Apr 14 - Tue, Apr 21
Multiple Airlines Logo
2:00 pm - 1:55 pm
ORD
-
TRS
16h 55m
2 stops
Multiple Airlines Logo
6:20 am - 3:15 pm
TRS
-
ORD
15h 55m
2 stops
$778Multiple Airlines
Thu, Apr 16 - Tue, Apr 21
Multiple Airlines Logo
7:25 pm - 8:00 pm
ORD
-
TRS
17h 35m
2 stops
Multiple Airlines Logo
6:35 am - 4:00 pm
TRS
-
ORD
40h 25m
2 stops
$783Multiple Airlines
Tue, Apr 14 - Tue, Apr 21
ITA Airways Logo
11:00 am - 10:25 am
ORD
-
TRS
16h 25m
2 stops
ITA Airways Logo
11:15 am - 1:10 pm
TRS
-
ORD
32h 55m
1 stop
$814ITA Airways
Fri, May 8 - Fri, May 15
Multiple Airlines Logo
10:30 pm - 10:15 pm
ORD
-
TRS
16h 45m
1 stop
Multiple Airlines Logo
6:20 am - 3:15 pm
TRS
-
ORD
15h 55m
2 stops
$818Multiple Airlines
Thu, Apr 16 - Tue, Apr 21
ITA Airways Logo
11:00 am - 2:30 pm
ORD
-
TRS
20h 30m
2 stops
ITA Airways Logo
3:15 pm - 1:10 pm
TRS
-
ORD
28h 55m
1 stop
$863ITA Airways
Fri, May 8 - Fri, May 15
Lufthansa Logo
4:05 pm - 1:55 pm
ORD
-
TRS
14h 50m
1 stop
Lufthansa Logo
6:00 am - 7:55 pm
TRS
-
ORD
20h 55m
1 stop
$905Lufthansa
Fri, May 8 - Fri, May 15
Lufthansa Logo
4:05 pm - 1:55 pm
ORD
-
TRS
14h 50m
1 stop
Lufthansa Logo
6:00 am - 12:55 pm
TRS
-
ORD
13h 55m
1 stop
$906Lufthansa
Fri, May 8 - Fri, May 15
KLM Logo
1:24 pm - 2:30 pm
MDW
-
TRS
18h 06m
2 stops
KLM Logo
6:35 am - 5:58 pm
TRS
-
MDW
18h 23m
2 stops
$924KLM
Thu, Apr 16 - Tue, Apr 21
KLM Logo
1:24 pm - 2:30 pm
MDW
-
TRS
18h 06m
2 stops
KLM Logo
6:35 am - 10:28 pm
TRS
-
MDW
22h 53m
2 stops
$1,398KLM
Mon, Apr 13 - Mon, Apr 20

Lufthansa flights from Illinois to Trieste

Our best Lufthansa deals on Illinois to Trieste flight tickets
Lufthansa
May 8
ORD4:05 pmChicago O'Hare Intl
14h 50m
1 stop
TRS1:55 pmTrieste Ronchi dei Legionari
May 15
TRS6:00 amTrieste Ronchi dei Legionari
20h 55m
1 stop
ORD7:55 pmChicago O'Hare Intl
$905
Lufthansa
May 8
ORD4:05 pmChicago O'Hare Intl
14h 50m
1 stop
TRS1:55 pmTrieste Ronchi dei Legionari
May 15
TRS6:00 amTrieste Ronchi dei Legionari
13h 55m
1 stop
ORD12:55 pmChicago O'Hare Intl
$906
Lufthansa
Apr 13
ORD10:30 pmChicago O'Hare Intl
16h 55m
1 stop
TRS10:25 pmTrieste Ronchi dei Legionari
Apr 20
TRS2:50 pmTrieste Ronchi dei Legionari
34h 25m
2 stops
ORD6:15 pmChicago O'Hare Intl
$959

ITA Airways flights from Illinois to Trieste

Our best ITA Airways deals on Illinois to Trieste flight tickets
ITA Airways
May 8
ORD11:00 amChicago O'Hare Intl
16h 25m
2 stops
TRS10:25 amTrieste Ronchi dei Legionari
May 15
TRS11:15 amTrieste Ronchi dei Legionari
32h 55m
1 stop
ORD1:10 pmChicago O'Hare Intl
$814
ITA Airways
May 8
ORD11:00 amChicago O'Hare Intl
20h 30m
2 stops
TRS2:30 pmTrieste Ronchi dei Legionari
May 15
TRS3:15 pmTrieste Ronchi dei Legionari
28h 55m
1 stop
ORD1:10 pmChicago O'Hare Intl
$863
ITA Airways
May 8
ORD11:17 amChicago O'Hare Intl
16h 08m
2 stops
TRS10:25 amTrieste Ronchi dei Legionari
May 15
TRS11:15 amTrieste Ronchi dei Legionari
38h 15m
2 stops
ORD6:30 pmChicago O'Hare Intl
$937

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 February 28, 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

Tue 4/14

4:05 pm-1:45 pm

2 stops14h 40m

Trieste Ronchi dei Legionari

Tue 4/21

6:20 am-3:25 pm

2 stops16h 05m

$763

ChicagoTrieste

ORD - TRS

ORDTRS

Chicago O'Hare Intl

Thu 4/16

2:00 pm-1:55 pm

2 stops16h 55m

Trieste Ronchi dei Legionari

Tue 4/21

6:20 am-3:15 pm

2 stops15h 55m

$778

ChicagoTrieste

ORD - TRS

ORDTRS

Chicago O'Hare Intl

Tue 4/14

7:25 pm-8:00 pm

2 stops17h 35m

Trieste Ronchi dei Legionari

Tue 4/21

6:35 am-4:00 pm

2 stops40h 25m

$783

ChicagoTrieste

ORD - TRS

ORDTRS

Chicago O'Hare Intl

Fri 5/8

11:00 am-10:25 am

2 stops16h 25m

Trieste Ronchi dei Legionari

Fri 5/15

11:15 am-1:10 pm

1 stop32h 55m

$814

ChicagoTrieste

ORD - TRS

ORDTRS

Chicago O'Hare Intl

Thu 4/16

10:30 pm-10:15 pm

1 stop16h 45m

Trieste Ronchi dei Legionari

Tue 4/21

6:20 am-3:15 pm

2 stops15h 55m

$818

ChicagoTrieste

ORD - TRS

ORDTRS

Chicago O'Hare Intl

Fri 5/8

11:00 am-2:30 pm

2 stops20h 30m

Trieste Ronchi dei Legionari

Fri 5/15

3:15 pm-1:10 pm

1 stop28h 55m

$863

ChicagoTrieste

ORD - TRS

ORDTRS

Chicago O'Hare Intl

Fri 5/8

4:05 pm-1:55 pm

1 stop14h 50m

Trieste Ronchi dei Legionari

Fri 5/15

6:00 am-7:55 pm

1 stop20h 55m

$905

ChicagoTrieste

ORD - TRS

ORDTRS

Chicago O'Hare Intl

Fri 5/8

4:05 pm-1:55 pm

1 stop14h 50m

Trieste Ronchi dei Legionari

Fri 5/15

6:00 am-12:55 pm

1 stop13h 55m

$906

ChicagoTrieste

MDW - TRS

MDWTRS

Chicago Midway

Thu 4/16

1:24 pm-2:30 pm

2 stops18h 06m

Trieste Ronchi dei Legionari

Tue 4/21

6:35 am-5:58 pm

2 stops18h 23m

$924

ChicagoTrieste

MDW - TRS

MDWTRS

Chicago Midway

Mon 4/13

1:24 pm-2:30 pm

2 stops18h 06m

Trieste Ronchi dei Legionari

Mon 4/20

6:35 am-10:28 pm

2 stops22h 53m

$1,398

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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See travel insights to Trieste from

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 10% 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

14h 50m

Direct flights

None
The fastest flight from Illinois to Trieste takes 14h 50m
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.

An easier way to manage your Trieste trip

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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
Scandinavian Airlines
United Airlines
Lufthansa
ITA Airways
Aer Lingus
TAP AIR PORTUGAL
Iberia
SWISS
British Airways