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Trieste

$542+ 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 7/1. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — TRS
May 6 — May 131
Tue 5/6
Tue 5/13
1 adult, Economy
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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 May 1, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
2 stars

Round-trip from

$777
(Gurufare)

One-way from

$542
(Cheapflightsfares)
Provider with most accurate pricing for Chicago (CHI)-Trieste Ronchi dei Legionari flight deals.
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Provider most trusted by Cheapflights users for Chicago (CHI)-Trieste Ronchi dei Legionari flights.
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From Illinois to Trieste Ronchi dei Legionari
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One-way flight from Illinois to Trieste Ronchi dei Legionari
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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 May 1, 2025.

This Gurufare deal was found by Cheapflights users on 4/30. 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 Gurufare is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/1412:28 pmSTL - TRS
2 stops18h 37mMultiple Airlines
Wed 10/292:40 pmTRS - STL
2 stops30h 41mMultiple Airlines
Deal found 4/30$777
This FlightHub deal was found by Cheapflights users on 4/30. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/2311:25 amORD - TRS
2 stops24h 10mTurkish Airlines
Tue 9/3011:15 amTRS - ORD
2 stops29h 25mTurkish Airlines
Deal found 4/30$834
This Trip.com deal was found by Cheapflights users on 4/30. 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.
Wed 9/173:30 pmSTL - TRS
1 stop15h 35mLufthansa
Fri 9/266:30 amTRS - STL
1 stop14h 00mLufthansa
Deal found 4/30$848
This Gurufare deal was found by Cheapflights users on 4/30. 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 Gurufare is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/2310:30 pmORD - TRS
1 stop17h 05mLufthansa
Tue 9/306:30 amTRS - ORD
1 stop13h 25mLufthansa
Deal found 4/30$898
This FlightHub deal was found by Cheapflights users on 4/30. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/234:42 pmORD - TRS
2 stops14h 23mMultiple Airlines
Tue 9/306:30 amTRS - ORD
1 stop13h 25mMultiple Airlines
Deal found 4/30$909
This lastminute.com deal was found by Cheapflights users on 5/1. 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 lastminute.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 6/1511:00 amORD - TRS
2 stops20h 30mKLM
Sun 6/223:15 pmTRS - ORD
2 stops32h 03mKLM
Deal found 5/1$1,129
This Austrian Airlines deal was found by Cheapflights users on 4/30. 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 Austrian Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/154:20 pmORD - TRS
2 stops35h 05mAustrian Airlines
Mon 10/137:25 pmTRS - ORD
2 stops24h 55mAustrian Airlines
Deal found 4/30$1,198
This Gotogate deal was found by Cheapflights users on 5/1. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 6/153:00 pmORD - TRS
1 stop16h 30mITA Airways
Sun 6/227:15 pmTRS - ORD
1 stop24h 55mITA Airways
Deal found 5/1$1,280
This KAYAK deal was found by Cheapflights users on 4/30. 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.
Thu 7/247:25 pmORD - TRS
2 stops16h 05mIcelandair
Sun 8/311:15 amTRS - ORD
2 stops17h 00mIcelandair
Deal found 4/30$1,385
This Delta deal was found by Cheapflights users on 4/30. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/2310:20 amORD - TRS
2 stops17h 05mDelta
Sat 8/26:35 amTRS - ORD
2 stops32h 50mDelta
Deal found 4/30$1,407
This Delta deal was found by Cheapflights users on 4/30. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 6/1210:26 amMDW - TRS
2 stops21h 04mDelta
Thu 6/196:35 amTRS - MDW
2 stops22h 10mDelta
Deal found 4/30$1,929
This lastminute.com deal was found by Cheapflights users on 5/1. 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 lastminute.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 6/151:09 pmMDW - TRS
2 stops18h 21mMultiple Airlines
Sun 6/226:35 amTRS - MDW
2 stops18h 27mMultiple Airlines
Deal found 5/1$2,396

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 May 1, 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

St. LouisTrieste

STL - TRS

STLTRS

Lambert-St Louis

Tue 10/14

12:28 pm-2:05 pm

2 stops18h 37m

Trieste Ronchi dei Legionari

Wed 10/29

2:40 pm-3:21 pm

2 stops30h 41m

$777

ChicagoTrieste

ORD - TRS

ORDTRS

Chicago O'Hare Intl

Tue 9/23

11:25 am-6:35 pm

2 stops24h 10m

Trieste Ronchi dei Legionari

Tue 9/30

11:15 am-9:40 am

2 stops29h 25m

$834

St. LouisTrieste

STL - TRS

STLTRS

Lambert-St Louis

Wed 9/17

3:30 pm-2:05 pm

1 stop15h 35m

Trieste Ronchi dei Legionari

Fri 9/26

6:30 am-1:30 pm

1 stop14h 00m

$848

ChicagoTrieste

ORD - TRS

ORDTRS

Chicago O'Hare Intl

Tue 9/23

10:30 pm-10:35 pm

1 stop17h 05m

Trieste Ronchi dei Legionari

Tue 9/30

6:30 am-12:55 pm

1 stop13h 25m

$898

ChicagoTrieste

ORD - TRS

ORDTRS

Chicago O'Hare Intl

Tue 9/23

4:42 pm-2:05 pm

2 stops14h 23m

Trieste Ronchi dei Legionari

Tue 9/30

6:30 am-12:55 pm

1 stop13h 25m

$909

ChicagoTrieste

ORD - TRS

ORDTRS

Chicago O'Hare Intl

Sun 6/15

11:00 am-2:30 pm

2 stops20h 30m

Trieste Ronchi dei Legionari

Sun 6/22

3:15 pm-4:18 pm

2 stops32h 03m

$1,129

ChicagoTrieste

ORD - TRS

ORDTRS

Chicago O'Hare Intl

Mon 9/15

4:20 pm-10:25 am

2 stops35h 05m

Trieste Ronchi dei Legionari

Mon 10/13

7:25 pm-1:20 pm

2 stops24h 55m

$1,198

ChicagoTrieste

ORD - TRS

ORDTRS

Chicago O'Hare Intl

Sun 6/15

3:00 pm-2:30 pm

1 stop16h 30m

Trieste Ronchi dei Legionari

Sun 6/22

7:15 pm-1:10 pm

1 stop24h 55m

$1,280

ChicagoTrieste

ORD - TRS

ORDTRS

Chicago O'Hare Intl

Thu 7/24

7:25 pm-6:30 pm

2 stops16h 05m

Trieste Ronchi dei Legionari

Sun 8/3

11:15 am-9:15 pm

2 stops17h 00m

$1,385

ChicagoTrieste

ORD - TRS

ORDTRS

Chicago O'Hare Intl

Wed 7/23

10:20 am-10:25 am

2 stops17h 05m

Trieste Ronchi dei Legionari

Sat 8/2

6:35 am-8:25 am

2 stops32h 50m

$1,407

Flights are sorted by cheapest round-trip flights first.

Deals found on 5/1

Showing 1-10 of 16 results
1
2

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

Rainfall in Trieste by month

Plan your trip to Trieste by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Trieste ranges from 2.4 - 4.5 inches per month. November is typically the wettest month, when rainfall can reach 4.5 in. February is typically the driest time to visit Trieste when rainfall is around 2.4 in.

Temperature in Trieste by month

Plan your trip to Trieste by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Trieste, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 75.2 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 41.0 F).

Reviews of airlines servicing Trieste

Get insights into the airlines that provide service to Trieste. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Trieste. Reviews last updated May 1, 2025.
Get a feel of what it's like to fly with Delta, KLM and Austrian Airlines from Illinois to Trieste by reading reviews from past customers. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Delta
8.0
Very good
7,934 reviews

Comfort

7.9

Boarding

8.2

Entertainment

7.9

Food

7.3

Crew

8.5

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
Delta
8.0
Very good
7,934 reviews
Delta
8.0
Very good
7,934 reviews

Comfort

7.9

Boarding

8.2

Entertainment

7.9

Food

7.3

Crew

8.5

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
KLM
7.8
Good
1,334 reviews
Delta
8.0
Very good
7,934 reviews

Comfort

7.9

Boarding

8.2

Entertainment

7.9

Food

7.3

Crew

8.5

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
Austrian Airlines
7.6
Good
781 reviews
Delta
8.0
Very good
7,934 reviews

Comfort

7.9

Boarding

8.2

Entertainment

7.9

Food

7.3

Crew

8.5

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
Turkish Airlines
7.3
Good
3,791 reviews
Delta
8.0
Very good
7,934 reviews

Comfort

7.9

Boarding

8.2

Entertainment

7.9

Food

7.3

Crew

8.5

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
Icelandair
7.0
Good
487 reviews
Delta
8.0
Very good
7,934 reviews

Comfort

7.9

Boarding

8.2

Entertainment

7.9

Food

7.3

Crew

8.5

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

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.

  • What are the cheapest airlines to fly from Illinois to Trieste one-way?

    $542 is the cheapest one-way deal found within the past few days, from ITA Airways. You may also be able to find cheap deals on Lufthansa and Delta, with prices starting from $681 and $814, respectively.

  • 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.

See more FAQs

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Alternative routes for Illinois to Trieste

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Top airline flying from Illinois to Trieste

Discover the top airline that operate flights from Illinois to Trieste. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated May 1, 2025.
AirlineCheapestAverageFlexibilityOn-time
ITA AirwaysCheapest$540Average$1,064FlexibilityNo cancel feeOn-time81%

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