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Trieste

$911+ 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 1/5. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — TRS
Jan 11 — Jan 181
Sun 1/11
Sun 1/18
1 adult, Economy
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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 December 12, 2025.

This KAYAK deal was found by Cheapflights users on 12/10. 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.
Wed 12/314:10 pmORD - TRS
2 stops19h 20mSWISS
Tue 1/611:15 amTRS - ORD
2 stops36h 05mSWISS
Deal found 12/10$1,829
This Arangrant deal was found by Cheapflights users on 12/11. 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.
Sat 12/136:30 pmORD - TRS
2 stops17h 00mMultiple Airlines
Sat 1/106:35 amTRS - ORD
2 stops17h 45mMultiple Airlines
Deal found 12/11$3,307
This Cheapflightsfares deal was found by Cheapflights users on 12/10. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/132:40 pmORD - TRS
2 stops16h 25mLufthansa
Sat 1/106:25 amTRS - ORD
2 stops19h 08mLufthansa
Deal found 12/10$3,378
This Cheapflightsfares deal was found by Cheapflights users on 12/10. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/143:45 pmORD - TRS
1 stop19h 45mLufthansa
Thu 1/82:50 pmTRS - ORD
1 stop12h 15mLufthansa
Deal found 12/10$3,387

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 December 12, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

AranGrant
3 stars

Round-trip from

$911
(Cheapflightsfares)
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 December 12, 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

Mon 1/5

5:55 pm-2:00 pm

2 stops13h 05m

Trieste Ronchi dei Legionari

Mon 1/12

11:15 am-11:10 am

2 stops30h 55m

$911

ChicagoTrieste

ORD - TRS

ORDTRS

Chicago O'Hare Intl

Wed 2/4

11:50 am-6:30 pm

2 stops47h 40m

Trieste Ronchi dei Legionari

Sun 2/8

11:15 am-6:25 pm

2 stops38h 10m

$928

ChicagoTrieste

ORD - TRS

ORDTRS

Chicago O'Hare Intl

Mon 1/5

6:25 pm-2:00 pm

1 stop12h 35m

Trieste Ronchi dei Legionari

Mon 1/12

11:15 am-12:45 pm

2 stops32h 30m

$1,017

ChicagoTrieste

ORD - TRS

ORDTRS

Chicago O'Hare Intl

Wed 12/31

4:10 pm-6:30 pm

2 stops19h 20m

Trieste Ronchi dei Legionari

Tue 1/6

11:15 am-4:20 pm

2 stops36h 05m

$1,829

St. LouisTrieste

STL - TRS

STLTRS

Lambert-St Louis

Wed 2/4

11:22 am-10:25 am

2 stops16h 03m

Trieste Ronchi dei Legionari

Sun 2/8

6:35 am-3:29 pm

2 stops39h 54m

$1,858

ChicagoTrieste

ORD - TRS

ORDTRS

Chicago O'Hare Intl

Wed 6/10

10:40 pm-6:30 pm

2 stops36h 50m

$1,363

ChicagoTrieste

ORD - TRS

ORDTRS

Chicago O'Hare Intl

Wed 6/10

10:40 am-10:25 am

2 stops16h 45m

$1,369

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/11

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 $429). Flying from Illinois to Trieste in June is currently the most expensive (average of $785). 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 Lufthansa, Turkish Airlines, and United Airlines fly from Illinois to Trieste in about 13h 05m. The time it takes to get you to your destination can typically vary by up to 34h 35m. The distance between Illinois and Trieste is about 4683 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, February is the cheapest month in which you can book a flight from Illinois to Trieste (average of $429). Flying from Illinois to Trieste in June is currently the most expensive (average of $785). 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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