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Trieste

$312+ 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 10/7. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — TRS
Apr 29 — May 61
Tue 4/29
Tue 5/6
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 April 24, 2025.

Most accurate provider

AranGrant
3 stars

Most trusted provider

AranGrant
3 stars

Round-trip from

$823
(Gurufare)

One-way from

$446
(Kiwi.com)
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 April 24, 2025.

This Gurufare deal was found by Cheapflights users on 4/23. 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 4/23$823
This FlightHub deal was found by Cheapflights users on 4/24. 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 9/237:50 pmORD - TRS
2 stops35h 40mMultiple Airlines
Tue 9/303:15 pmTRS - ORD
2 stops25h 25mMultiple Airlines
Deal found 4/24$834
This FlightHub deal was found by Cheapflights users on 4/23. 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 9/306:35 amTRS - ORD
2 stops34h 05mTurkish Airlines
Deal found 4/23$835
This Gurufare deal was found by Cheapflights users on 4/23. 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.
Wed 5/71:30 pmORD - TRS
2 stops37h 55mITA Airways
Sat 5/103:15 pmTRS - ORD
1 stop28h 55mITA Airways
Deal found 4/23$873
This Gurufare deal was found by Cheapflights users on 4/23. 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 9/234:00 pmORD - TRS
1 stop15h 05mLufthansa
Tue 9/302:45 pmTRS - ORD
1 stop12h 10mLufthansa
Deal found 4/23$1,060
This KAYAK deal was found by Cheapflights users on 4/24. 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 7/55:30 pmSTL - TRS
2 stops21h 55mLufthansa
Tue 7/152:45 pmTRS - STL
1 stop29h 45mLufthansa
Deal found 4/24$1,196
This oojo deal was found by Cheapflights users on 4/23. 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.
Sat 6/146:15 pmORD - TRS
2 stops41h 15mTAP AIR PORTUGAL
Thu 7/36:35 amTRS - ORD
2 stops40h 35mTAP AIR PORTUGAL
Deal found 4/23$1,487
This Austrian Airlines deal was found by Cheapflights users on 4/23. 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.
Sat 6/74:20 pmORD - TRS
2 stops23h 35mAustrian Airlines
Sat 6/146:35 amTRS - ORD
2 stops37h 45mAustrian Airlines
Deal found 4/23$1,580
This Delta deal was found by Cheapflights users on 4/23. 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.
Tue 10/71:05 pmMDW - TRS
2 stops18h 25mDelta
Sun 10/196:35 amTRS - MDW
2 stops18h 23mDelta
Deal found 4/23$2,245
This AranGrant deal was found by Cheapflights users on 4/23. 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.
Tue 10/77:25 pmORD - TRS
2 stops16h 10mIcelandair
Sun 10/1911:15 amTRS - ORD
2 stops38h 00mIcelandair
Deal found 4/23$3,551

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 April 24, 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

$823

ChicagoTrieste

ORD - TRS

ORDTRS

Chicago O'Hare Intl

Tue 9/23

7:50 pm-2:30 pm

2 stops35h 40m

Trieste Ronchi dei Legionari

Tue 9/30

3:15 pm-9:40 am

2 stops25h 25m

$834

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

6:35 am-9:40 am

2 stops34h 05m

$835

ChicagoTrieste

ORD - TRS

ORDTRS

Chicago O'Hare Intl

Wed 5/7

1:30 pm-10:25 am

2 stops37h 55m

Trieste Ronchi dei Legionari

Sat 5/10

3:15 pm-1:10 pm

1 stop28h 55m

$873

ChicagoTrieste

ORD - TRS

ORDTRS

Chicago O'Hare Intl

Tue 9/23

4:00 pm-2:05 pm

1 stop15h 05m

Trieste Ronchi dei Legionari

Tue 9/30

2:45 pm-7:55 pm

1 stop12h 10m

$1,060

St. LouisTrieste

STL - TRS

STLTRS

Lambert-St Louis

Sat 7/5

5:30 pm-10:25 pm

2 stops21h 55m

Trieste Ronchi dei Legionari

Tue 7/15

2:45 pm-1:30 pm

1 stop29h 45m

$1,196

ChicagoTrieste

ORD - TRS

ORDTRS

Chicago O'Hare Intl

Sat 6/14

6:15 pm-6:30 pm

2 stops41h 15m

Trieste Ronchi dei Legionari

Thu 7/3

6:35 am-4:10 pm

2 stops40h 35m

$1,487

ChicagoTrieste

ORD - TRS

ORDTRS

Chicago O'Hare Intl

Sat 6/7

4:20 pm-10:55 pm

2 stops23h 35m

Trieste Ronchi dei Legionari

Sat 6/14

6:35 am-1:20 pm

2 stops37h 45m

$1,580

ChicagoTrieste

MDW - TRS

MDWTRS

Chicago Midway

Tue 10/7

1:05 pm-2:30 pm

2 stops18h 25m

Trieste Ronchi dei Legionari

Sun 10/19

6:35 am-5:58 pm

2 stops18h 23m

$2,245

ChicagoTrieste

ORD - TRS

ORDTRS

Chicago O'Hare Intl

Tue 10/7

7:25 pm-6:35 pm

2 stops16h 10m

Trieste Ronchi dei Legionari

Sun 10/19

11:15 am-6:15 pm

2 stops38h 00m

$3,551

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/23

Showing 1-10 of 15 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 April 24, 2025.
Delta
8.0
Very good
7,920 reviews

Overall

8.0

Boarding

8.2

Comfort

7.9

Crew

8.5

Entertainment

7.9

Food

7.3

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
7,920 reviews
Delta
8.0
Very good
7,920 reviews

Overall

8.0

Boarding

8.2

Comfort

7.9

Crew

8.5

Entertainment

7.9

Food

7.3

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
780 reviews
Delta
8.0
Very good
7,920 reviews

Overall

8.0

Boarding

8.2

Comfort

7.9

Crew

8.5

Entertainment

7.9

Food

7.3

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
3,775 reviews
Delta
8.0
Very good
7,920 reviews

Overall

8.0

Boarding

8.2

Comfort

7.9

Crew

8.5

Entertainment

7.9

Food

7.3

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.
TAP AIR PORTUGAL
7.1
Good
1,845 reviews
Delta
8.0
Very good
7,920 reviews

Overall

8.0

Boarding

8.2

Comfort

7.9

Crew

8.5

Entertainment

7.9

Food

7.3

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.
ITA Airways
6.7
Okay
967 reviews
Delta
8.0
Very good
7,920 reviews

Overall

8.0

Boarding

8.2

Comfort

7.9

Crew

8.5

Entertainment

7.9

Food

7.3

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 $749 and $854, 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 April 24, 2025.
AirlineCheapestAverageFlexibilityOn-time
ITA AirwaysCheapest$540Average$1,064FlexibilityNo cancel feeOn-time81%

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