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Sofia

$424+ Cheap flights from Illinois to Sofia (SOF)

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 4/22. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — SOF
Feb 25 — Mar 41
Wed 2/25
Wed 3/4
1 adult, Economy
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Cheap flight deals from Illinois to Sofia

Cheapest flights from Illinois to Sofia
Explore the most affordable flight options available from Illinois to Sofia. Find the lowest fares from popular airlines and budget airlines, with prices last updated on January 26, 2026.

This FlightHub deal was found by Cheapflights users on 1/25. 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.
Wed 2/2511:50 am
ORD
-
SOF
1 stop19h 20m
Turkish Airlines
Mon 3/29:40 pm
SOF
-
ORD
1 stop20h 25m
Turkish Airlines
Deal found 1/25$516
This oojo deal was found by Cheapflights users on 1/26. 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.
Wed 9/211:25 am
ORD
-
SOF
1 stop24h 50m
Turkish Airlines
Thu 10/229:35 am
SOF
-
ORD
1 stop32h 05m
Turkish Airlines
Deal found 1/26$517
This Kiwi.com deal was found by Cheapflights users on 1/25. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 3/298:10 pm
ORD
-
SOF
1 stop16h 05m
Turkish Airlines
Sun 4/122:05 pm
SOF
-
ORD
1 stop27h 35m
Turkish Airlines
Deal found 1/25$521
This oojo deal was found by Cheapflights users on 1/26. 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 2/18:20 pm
ORD
-
SOF
1 stop16h 30m
Turkish Airlines
Sun 3/224:00 pm
SOF
-
ORD
1 stop26h 05m
Turkish Airlines
Deal found 1/26$523
This oojo deal was found by Cheapflights users on 1/24. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 2/88:20 pm
ORD
-
SOF
1 stop28h 25m
Turkish Airlines
Sun 2/159:35 am
SOF
-
ORD
1 stop32h 30m
Turkish Airlines
Deal found 1/24$524
This oojo deal was found by Cheapflights users on 1/26. 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 8/811:50 pm
ORD
-
SOF
1 stop24h 55m
Turkish Airlines
Fri 10/309:40 pm
SOF
-
ORD
1 stop20h 25m
Turkish Airlines
Deal found 1/26$525
This oojo deal was found by Cheapflights users on 1/26. 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.
Fri 3/611:50 am
ORD
-
SOF
1 stop12h 55m
Turkish Airlines
Sun 9/69:05 pm
SOF
-
ORD
1 stop33h 00m
Turkish Airlines
Deal found 1/26$527
This Justfly.com deal was found by Cheapflights users on 1/26. 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 Justfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/711:25 am
ORD
-
SOF
1 stop19h 35m
Turkish Airlines
Mon 6/13:50 pm
SOF
-
ORD
1 stop25h 50m
Turkish Airlines
Deal found 1/26$537
This Kiwi.com deal was found by Cheapflights users on 1/26. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/111:25 am
ORD
-
SOF
1 stop13h 20m
Turkish Airlines
Wed 10/289:40 pm
SOF
-
ORD
1 stop20h 25m
Turkish Airlines
Deal found 1/26$538
This FlightHub deal was found by Cheapflights users on 1/25. 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.
Wed 3/1812:50 pm
ORD
-
SOF
1 stop19h 20m
Turkish Airlines
Wed 4/159:05 pm
SOF
-
ORD
1 stop20h 35m
Turkish Airlines
Deal found 1/25$540
This Kiwi.com deal was found by Cheapflights users on 1/25. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/138:10 pm
ORD
-
SOF
1 stop16h 05m
Turkish Airlines
Sun 9/209:05 pm
SOF
-
ORD
1 stop33h 00m
Turkish Airlines
Deal found 1/25$541
This Kiwi.com deal was found by Cheapflights users on 1/26. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 1/3011:50 am
ORD
-
SOF
1 stop19h 20m
Turkish Airlines
Sun 2/154:00 pm
SOF
-
ORD
1 stop26h 05m
Turkish Airlines
Deal found 1/26$544

Find flight deals from Illinois to Sofia

Keep the following information in mind while searching for Illinois to Sofia flight deals. Data was last updated January 26, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$516
(FlightHub)

One-way from

$424
(Air Serbia)

Popular in

June

Cheapest in

February

Average price

$611
Provider with most accurate pricing for Chicago (CHI)-Sofia flight deals.
Search Deals
Provider most trusted by Cheapflights users for Chicago (CHI)-Sofia flights.
Search Deals
From Illinois to Sofia
Search Deals
One-way flight from Illinois to Sofia
Search Deals
Highest demand for flights based on searches. 26% potential increase in price ($266 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 5% potential price decrease ($38 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in January 2026
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Illinois to Sofia 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 26, 2026.
Use the filters below to find and compare flights from Illinois to Sofia that are best for you.

Fly from

Illinois

Fly to

Sofia

Route

Depart

Return

Price

St. LouisSofia

STL - SOF

STLSOF

Lambert-St Louis

Thu 2/26

6:00 pm-10:45 pm

2 stops20h 45m

Sofia

Mon 3/2

6:10 am-10:59 pm

2 stops24h 49m

$546

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

Thu 3/5

11:50 am-3:10 pm

1 stop19h 20m

Sofia

Mon 3/9

9:35 am-7:25 pm

1 stop16h 50m

$584

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

Sat 4/25

1:00 pm-12:10 pm

2 stops15h 10m

Sofia

Fri 5/8

6:20 am-2:50 pm

1 stop16h 30m

$616

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

Wed 4/8

1:00 pm-12:10 pm

2 stops15h 10m

Sofia

Sun 4/12

1:50 pm-7:55 pm

1 stop14h 05m

$616

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

Sat 4/25

11:15 am-12:10 pm

2 stops16h 55m

Sofia

Sat 5/9

1:50 pm-7:55 pm

1 stop14h 05m

$616

ChicagoSofia

MDW - SOF

MDWSOF

Chicago Midway

Sun 2/15

11:45 am-1:55 pm

2 stops18h 10m

Sofia

Wed 2/25

7:00 am-5:45 pm

2 stops18h 45m

$625

ChicagoSofia

MDW - SOF

MDWSOF

Chicago Midway

Wed 3/4

1:29 pm-2:05 pm

2 stops16h 36m

Sofia

Mon 3/9

7:00 am-5:54 pm

2 stops17h 54m

$625

ChicagoSofia

MDW - SOF

MDWSOF

Chicago Midway

Fri 2/6

1:26 pm-1:55 pm

2 stops16h 29m

Sofia

Thu 2/12

7:00 am-5:37 pm

2 stops18h 37m

$625

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

Tue 3/17

2:18 pm-1:15 pm

2 stops15h 57m

Sofia

Tue 3/31

2:10 pm-10:03 pm

2 stops15h 53m

$625

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

Sun 2/8

1:00 pm-1:00 pm

2 stops16h 00m

Sofia

Sun 2/15

6:10 am-6:42 pm

2 stops20h 32m

$626

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/25

Showing 1-10 of 24 results
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Best time to book a flight from Illinois to Sofia

Have a flexible travel schedule? Discover the best time to fly to Sofia 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 Sofia

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

Currently, November is the cheapest month in which you can book a flight from Illinois to Sofia (average of $473). Flying from Illinois to Sofia in June is currently the most expensive (average of $825). 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 Sofia. 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 Sofia from Illinois?

    Most people fly into Sofia (SOF) if they book a flight to Sofia from Illinois. Sofia is conveniently located just 4.2 mi from Sofia’s city center.

  • How long is the flight from Illinois to Sofia?

    A quick flight from Illinois to Sofia can take about 16h 37m. United Airlines provides one of the quickest options available for as low as $629. There are 5198 mi between Illinois and Sofia. Both multi-stop and nonstop flights can be found to your destination and back.

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

    The cheapest airlines for a one-way flight from Illinois to Sofia are Turkish Airlines ($295), United Airlines ($305), and Austrian Airlines ($330).

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

    While some choose either Chicago Midway - Sofia or Lambert-St Louis - Sofia, Chicago O'Hare Intl - Sofia is the most popular route from Illinois to Sofia.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from Illinois to Sofia 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 Sofia?

    Currently, November is the cheapest month in which you can book a flight from Illinois to Sofia (average of $473). Flying from Illinois to Sofia in June is currently the most expensive (average of $825). 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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Alternative routes for Illinois to Sofia

See prices for flight routes from nearby airports that may be better suited for you.
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Top 10 airlines flying from Illinois to Sofia

Discover the top 10 airlines that operate flights from Illinois to Sofia. 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 January 26, 2026.
AirlineCheapestAverageFlexibilityOn-time
Turkish AirlinesCheapest$519Average$774FlexibilityNo cancel feeOn-time77%
KLMCheapest$533Average$668FlexibilityNo cancel feeOn-time75%
United AirlinesCheapest$568Average$782FlexibilityNo cancel feeOn-time69%
Air FranceCheapest$585Average$624FlexibilityNo cancel feeOn-time77%
LufthansaCheapest$587Average$879FlexibilityNo cancel feeOn-time76%
LOTCheapest$593Average$922FlexibilityNo cancel feeOn-time81%
SWISSCheapest$593Average$821FlexibilityNo cancel feeOn-time79%
Austrian AirlinesCheapest$606Average$940FlexibilityNo cancel feeOn-time78%
British AirwaysCheapest$611Average$749FlexibilityNo cancel feeOn-time70%
Air SerbiaCheapest$652Average$922FlexibilityNo cancel feeOn-timeN/A

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