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Trieste

$689+ Cheap flights from Illinois to Trieste (TRS)

This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 12/5. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — TRS
nov. 21 — nov. 281
vie. 11/21
vie. 11/28
1 adult, Economy
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Find 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 octubre 22, 2025.

This Mytrip deal was found by Cheapflights users on 10/21. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 12/57:05 amORD - TRS
2 stops32h 40mMultiple Airlines
vie. 12/126:35 amTRS - ORD
3 stops20h 30mMultiple Airlines
Deal found 10/21$689
This KLM deal was found by Cheapflights users on 10/21. 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 KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 11/129:33 amSTL - TRS
2 stops21h 57mKLM
dom. 11/163:15 pmTRS - STL
2 stops32h 18mKLM
Deal found 10/21$763
This Booking.com deal was found by Cheapflights users on 10/21. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 12/58:15 pmORD - TRS
2 stops39h 15mTAP AIR PORTUGAL
vie. 12/123:15 pmTRS - ORD
2 stops54h 30mTAP AIR PORTUGAL
Deal found 10/21$767
This Lufthansa deal was found by Cheapflights users on 10/20. 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 Lufthansa is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 11/123:50 pmSTL - TRS
1 stop15h 15mLufthansa
dom. 11/163:00 pmTRS - STL
2 stops39h 44mLufthansa
Deal found 10/20$796
This SmartFares deal was found by Cheapflights users on 10/21. 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 SmartFares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 12/54:20 pmORD - TRS
1 stop14h 45mLufthansa
vie. 12/126:25 amTRS - ORD
1 stop13h 45mLufthansa
Deal found 10/21$873
This KLM deal was found by Cheapflights users on 10/20. 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 KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 11/136:00 amMDW - TRS
2 stops29h 30mKLM
lun. 11/176:35 amTRS - MDW
2 stops24h 05mKLM
Deal found 10/20$1,013
This KLM deal was found by Cheapflights users on 10/22. 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 KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
dom. 12/141:23 pmORD - TRS
2 stops18h 07mKLM
jue. 1/83:15 pmTRS - ORD
2 stops30h 05mKLM
Deal found 10/22$1,863
This AranGrant deal was found by Cheapflights users on 10/21. 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 AranGrant is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
dom. 12/143:45 pmORD - TRS
1 stop11h 40mAustrian Airlines
jue. 1/83:15 pmTRS - ORD
2 stops29h 45mAustrian Airlines
Deal found 10/21$1,888

Cheap flight deals from Illinois to Trieste

Keep the following information in mind while searching for Illinois to Trieste flight deals. Data was last updated octubre 22, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$689
(Mytrip)
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
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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 octubre 22, 2025.
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

vie. 12/5

7:05 am-10:45 pm

2 stops32h 40m

Trieste Ronchi dei Legionari

vie. 12/12

6:35 am-8:05 pm

3 stops20h 30m

$689

St. LouisTrieste

STL - TRS

STLTRS

Lambert-St Louis

mié. 11/12

11:39 am-10:55 pm

2 stops28h 16m

Trieste Ronchi dei Legionari

dom. 11/16

3:15 pm-4:33 pm

2 stops32h 18m

$763

ChicagoTrieste

ORD - TRS

ORDTRS

Chicago O'Hare Intl

vie. 12/5

8:15 pm-6:30 pm

2 stops39h 15m

Trieste Ronchi dei Legionari

vie. 12/12

3:15 pm-2:45 pm

2 stops54h 30m

$767

St. LouisTrieste

STL - TRS

STLTRS

Lambert-St Louis

mié. 11/12

3:50 pm-2:05 pm

1 stop15h 15m

Trieste Ronchi dei Legionari

dom. 11/16

3:00 pm-11:44 pm

2 stops39h 44m

$796

ChicagoTrieste

ORD - TRS

ORDTRS

Chicago O'Hare Intl

jue. 4/2

7:50 pm-10:55 pm

2 stops20h 05m

Trieste Ronchi dei Legionari

jue. 4/9

11:15 am-9:40 am

2 stops29h 25m

$862

ChicagoTrieste

ORD - TRS

ORDTRS

Chicago O'Hare Intl

vie. 12/5

4:20 pm-2:05 pm

1 stop14h 45m

Trieste Ronchi dei Legionari

vie. 12/12

6:25 am-1:10 pm

1 stop13h 45m

$873

ChicagoTrieste

ORD - TRS

ORDTRS

Chicago O'Hare Intl

sáb. 1/31

11:50 am-2:30 pm

2 stops19h 40m

Trieste Ronchi dei Legionari

dom. 2/8

3:15 pm-10:05 am

2 stops25h 50m

$926

ChicagoTrieste

ORD - TRS

ORDTRS

Chicago O'Hare Intl

vie. 2/6

8:20 pm-2:30 pm

2 stops35h 10m

Trieste Ronchi dei Legionari

dom. 2/15

11:15 am-10:05 am

2 stops29h 50m

$995

ChicagoTrieste

MDW - TRS

MDWTRS

Chicago Midway

jue. 11/13

1:15 pm-2:30 pm

2 stops18h 15m

Trieste Ronchi dei Legionari

lun. 11/17

6:35 am-11:40 pm

2 stops24h 05m

$1,013

ChicagoTrieste

ORD - TRS

ORDTRS

Chicago O'Hare Intl

dom. 4/5

3:00 pm-2:30 pm

1 stop16h 30m

Trieste Ronchi dei Legionari

mié. 4/8

6:35 am-1:10 pm

1 stop13h 35m

$1,226

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/22

Showing 1-10 of 12 results
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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, February is the cheapest month in which you can book a flight from Illinois to Trieste (average of $430). Flying from Illinois to Trieste in June is currently the most expensive (average of $851). 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 KLM, TAP AIR PORTUGAL, and Lufthansa fly from Illinois to Trieste in about 15h 15m. The time it takes to get you to your destination can typically vary by up to 24h. 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 Chicago Midway - Trieste Ronchi dei Legionari or Lambert-St Louis - 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, February is the cheapest month in which you can book a flight from Illinois to Trieste (average of $430). Flying from Illinois to Trieste in June is currently the most expensive (average of $851). 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

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