HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Trieste

$544+ Cheap flights from Illinois to Trieste (TRS)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 2/4. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — TRS
Feb 28 — Mar 71
Sat 2/28
Sat 3/7
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Illinois to Trieste with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

Cheap flight deals from Illinois to Trieste

Cheapest flights from Illinois to Trieste
Explore the most affordable flight options available from Illinois to Trieste. Find the lowest fares from popular airlines and budget airlines, with prices last updated on January 29, 2026.

This Trip.com deal was found by Cheapflights users on 1/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 4/56:00 pm
ORD
-
TRS
2 stops21h 55m
Multiple Airlines
Sat 4/186:35 am
TRS
-
ORD
2 stops40h 25m
Multiple Airlines
Deal found 1/28$672
This oojo deal was found by Cheapflights users on 1/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/238:55 am
ORD
-
TRS
2 stops22h 35m
ITA Airways
Sun 9/203:15 pm
TRS
-
ORD
2 stops34h 18m
ITA Airways
Deal found 1/28$693
This Travelocity deal was found by Cheapflights users on 1/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Travelocity is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/46:15 pm
ORD
-
TRS
2 stops21h 40m
Multiple Airlines
Wed 4/157:15 pm
TRS
-
ORD
2 stops51h 45m
Multiple Airlines
Deal found 1/28$699
This Expedia deal was found by Cheapflights users on 1/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/66:59 pm
STL
-
TRS
2 stops40h 31m
KLM
Fri 4/176:35 am
TRS
-
STL
2 stops21h 42m
KLM
Deal found 1/28$703
This KAYAK deal was found by Cheapflights users on 1/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/46:15 pm
ORD
-
TRS
2 stops21h 40m
TAP AIR PORTUGAL
Tue 4/213:15 pm
TRS
-
ORD
2 stops31h 45m
TAP AIR PORTUGAL
Deal found 1/28$714
This KAYAK deal was found by Cheapflights users on 1/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 4/56:00 pm
ORD
-
TRS
2 stops41h 30m
TAP AIR PORTUGAL
Tue 4/213:15 pm
TRS
-
ORD
2 stops31h 45m
TAP AIR PORTUGAL
Deal found 1/28$724
This TAP AIR PORTUGAL deal was found by Cheapflights users on 1/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure TAP AIR PORTUGAL is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/46:15 pm
ORD
-
TRS
2 stops21h 40m
TAP AIR PORTUGAL
Thu 4/163:15 pm
TRS
-
ORD
2 stops31h 45m
TAP AIR PORTUGAL
Deal found 1/28$732
This KAYAK deal was found by Cheapflights users on 1/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/46:15 pm
ORD
-
TRS
2 stops21h 40m
TAP AIR PORTUGAL
Sat 4/186:35 am
TRS
-
ORD
2 stops40h 25m
TAP AIR PORTUGAL
Deal found 1/28$734
This KAYAK deal was found by Cheapflights users on 1/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 2/21:15 pm
STL
-
TRS
2 stops17h 45m
Lufthansa
Fri 3/136:25 am
TRS
-
STL
1 stop14h 30m
Lufthansa
Deal found 1/28$741
This TAP AIR PORTUGAL deal was found by Cheapflights users on 1/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure TAP AIR PORTUGAL is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 4/56:00 pm
ORD
-
TRS
2 stops41h 30m
TAP AIR PORTUGAL
Thu 4/163:15 pm
TRS
-
ORD
2 stops31h 45m
TAP AIR PORTUGAL
Deal found 1/28$743
This KAYAK deal was found by Cheapflights users on 1/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 4/56:00 pm
ORD
-
TRS
2 stops41h 30m
TAP AIR PORTUGAL
Fri 4/176:35 am
TRS
-
ORD
2 stops40h 40m
TAP AIR PORTUGAL
Deal found 1/28$744
This Orbitz deal was found by Cheapflights users on 1/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Orbitz is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 4/53:30 pm
STL
-
TRS
1 stop15h 15m
Multiple Airlines
Sat 4/186:00 am
TRS
-
STL
2 stops16h 24m
Multiple Airlines
Deal found 1/28$746

Find flight deals from Illinois to Trieste

Keep the following information in mind while searching for Illinois to Trieste flight deals. Data was last updated January 29, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$672
(Trip.com)

One-way from

$544
(TAP AIR PORTUGAL)
Provider with most accurate pricing for Chicago (CHI)-Trieste Ronchi dei Legionari flight deals.
Search Deals
Provider most trusted by Cheapflights users for Chicago (CHI)-Trieste Ronchi dei Legionari flights.
Search Deals
From Illinois to Trieste Ronchi dei Legionari
Search Deals
One-way flight from Illinois to Trieste Ronchi dei Legionari
Search Deals

Cheapflights 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, Cheapflights users made 2,558,603 searches. Data last updated January 29, 2026.
Use the filters below to find and compare flights from Illinois to Trieste that are best for you.

Fly from

Illinois

Fly to

Trieste

Route

Depart

Return

Price

ChicagoTrieste

ORD - TRS

ORDTRS

Chicago O'Hare Intl

Sun 4/5

6:00 pm-6:30 pm

2 stops41h 30m

Trieste Ronchi dei Legionari

Thu 4/16

3:15 pm-4:00 pm

2 stops31h 45m

$743

St. LouisTrieste

STL - TRS

STLTRS

Lambert-St Louis

Sun 2/8

6:40 pm-2:00 pm

2 stops36h 20m

Trieste Ronchi dei Legionari

Fri 3/13

6:25 am-2:55 pm

1 stop14h 30m

$752

ChicagoTrieste

ORD - TRS

ORDTRS

Chicago O'Hare Intl

Sat 4/4

6:15 pm-10:55 pm

2 stops21h 40m

Trieste Ronchi dei Legionari

Sat 4/18

6:35 am-4:00 pm

2 stops40h 25m

$752

ChicagoTrieste

ORD - TRS

ORDTRS

Chicago O'Hare Intl

Sat 5/2

6:15 pm-10:55 pm

2 stops21h 40m

Trieste Ronchi dei Legionari

Sat 5/9

11:15 am-4:00 pm

2 stops35h 45m

$768

ChicagoTrieste

ORD - TRS

ORDTRS

Chicago O'Hare Intl

Sun 4/5

6:00 pm-6:30 pm

2 stops41h 30m

Trieste Ronchi dei Legionari

Wed 4/15

3:15 pm-4:00 pm

2 stops55h 45m

$780

St. LouisTrieste

STL - TRS

STLTRS

Lambert-St Louis

Wed 4/1

3:30 pm-2:00 pm

1 stop15h 30m

Trieste Ronchi dei Legionari

Thu 4/16

2:40 pm-1:25 pm

1 stop29h 45m

$796

St. LouisTrieste

STL - TRS

STLTRS

Lambert-St Louis

Wed 4/1

3:30 pm-2:00 pm

1 stop15h 30m

Trieste Ronchi dei Legionari

Tue 4/14

2:45 pm-1:25 pm

1 stop29h 40m

$796

St. LouisTrieste

STL - TRS

STLTRS

Lambert-St Louis

Sun 4/5

3:30 pm-1:45 pm

1 stop15h 15m

Trieste Ronchi dei Legionari

Tue 4/14

2:45 pm-9:08 pm

2 stops37h 23m

$806

St. LouisTrieste

STL - TRS

STLTRS

Lambert-St Louis

Tue 4/7

6:35 pm-10:15 pm

2 stops20h 40m

Trieste Ronchi dei Legionari

Tue 4/14

2:45 pm-9:08 pm

2 stops37h 23m

$810

ChicagoTrieste

ORD - TRS

ORDTRS

Chicago O'Hare Intl

Wed 4/8

6:00 pm-6:30 pm

2 stops41h 30m

Trieste Ronchi dei Legionari

Tue 4/21

3:15 pm-4:00 pm

2 stops31h 45m

$817

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/28

Showing 1-10 of 40 results
1
2
3
4

Best time to book a flight from Illinois to Trieste

Have a flexible travel schedule? Discover the best time to fly to Trieste from Illinois with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from Illinois to Trieste

What is the cheapest month to book a flight from Illinois to Trieste?

Currently, April is the cheapest month in which you can book a flight from Illinois to Trieste (average of $428). Flying from Illinois to Trieste in June is currently the most expensive (average of $777). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

Related info for your journey

Find useful and relevant information for your journey from Illinois to Trieste. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly into for flights to Trieste from Illinois?

    Located just 18.2 mi from the city center, Trieste Ronchi dei Legionari (TRS) is the airport most travelers will use when flying to Trieste from Illinois.

  • How long is the flight from Illinois to Trieste?

    Airlines like TAP AIR PORTUGAL, Lufthansa, and KLM fly from Illinois to Trieste in about 15h 30m. The time it takes to get you to your destination can typically vary by up to 26h. The distance between Illinois and Trieste is about 4931 mi. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

  • What are the most popular routes from Illinois to Trieste?

    The most popular route from Illinois to Trieste is Chicago O'Hare Intl - Trieste Ronchi dei Legionari. You may also consider Lambert-St Louis - Trieste Ronchi dei Legionari or Chicago Midway - Trieste Ronchi dei Legionari.

  • Can I find deals for flights from Illinois to Trieste that include hotel bookings?

    Yes. In addition to deals on Illinois to Trieste flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Illinois to Trieste?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Illinois to Trieste.

  • Can I find deals for business class flights from Illinois to Trieste?

    Yes. Cheapflights offers flight deals from Illinois to Trieste by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from Illinois to Trieste?

    Currently, April is the cheapest month in which you can book a flight from Illinois to Trieste (average of $428). Flying from Illinois to Trieste in June is currently the most expensive (average of $777). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Illinois to Trieste

See prices for flight routes from nearby airports that may be better suited for you.
John F Kennedy Intl to Vicenza flights
Newark to Vicenza flights
Dulles Intl to Vicenza flights
Philadelphia to Vicenza flights
LaGuardia to Vicenza flights
Boston to Vicenza flights
Los Angeles to Vicenza flights
Dallas/Fort Worth to Vicenza flights
O'Hare Intl to Vicenza flights
Atlanta to Vicenza flights
Baltimore to Vicenza flights
San Francisco to Vicenza flights
Reagan-National to Vicenza flights
Denver to Vicenza flights
Hobby to Vicenza flights
Orlando to Vicenza flights
Miami to Vicenza flights
Seattle to Vicenza flights
Charlotte to Vicenza flights
Tampa to Vicenza flights
Portland to Vicenza flights
Detroit to Vicenza flights
George Bush Intcntl to Vicenza flights
Midway to Vicenza flights
Indianapolis to Vicenza flights
Sky Harbor Intl to Vicenza flights
Love Field to Vicenza flights
Minneapolis to Vicenza flights
Grand Rapids to Vicenza flights
Santa Ana to Vicenza flights
Kansas City to Vicenza flights
Ontario to Vicenza flights
Raleigh to Vicenza flights
Salt Lake City to Vicenza flights
Cleveland to Vicenza flights
Fort Lauderdale to Vicenza flights
New Orleans to Vicenza flights
Nashville to Vicenza flights
San Jose to Vicenza flights
San Diego to Vicenza flights
Cincinnati to Vicenza flights
Las Vegas to Vicenza flights
Richmond to Vicenza flights
Pittsburgh to Vicenza flights
Flint to Vicenza flights
Norfolk to Vicenza flights
Jacksonville to Vicenza flights
Oklahoma City to Vicenza flights
El Paso to Vicenza flights
St. Louis to Vicenza flights

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.