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Sofia

$207+ 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 1/24. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — SOF
Feb 14 — Feb 211
Sat 2/14
Sat 2/21
1 adult, Economy
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Cheap 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 15, 2026.

Most accurate provider

Justfly.com
3 stars

Most trusted provider

Justfly.com
3 stars

Round-trip from

$526
(FlightHub)

One-way from

$207
(Kiwi.com)

Popular in

June

Cheapest in

February

Average price

$601
Provider with most accurate pricing for Chicago (CHI)-Sofia flight deals.
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Provider most trusted by Cheapflights users for Chicago (CHI)-Sofia flights.
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From Illinois to Sofia
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One-way flight from Illinois to Sofia
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Highest demand for flights based on searches. 27% potential increase in price ($269 potential increase over avg. RT price).
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Cheapest flight prices on average. 5% potential price decrease ($38 potential savings vs. average RT price).
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Average for round-trip flights in January 2026
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Find 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 15, 2026.

This FlightHub deal was found by Cheapflights users on 1/15. 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.
Mon 3/26:55 pm
STL
-
SOF
2 stops19h 50m
Lufthansa
Sun 3/86:10 am
SOF
-
STL
1 stop15h 45m
Lufthansa
Deal found 1/15$526
This United Airlines deal was found by Cheapflights users on 1/14. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/910:45 am
ORD
-
SOF
2 stops16h 15m
United Airlines
Fri 8/216:10 am
SOF
-
ORD
1 stop20h 05m
United Airlines
Deal found 1/14$529
This United Airlines deal was found by Cheapflights users on 1/14. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/1211:15 am
ORD
-
SOF
2 stops15h 25m
United Airlines
Fri 8/216:10 am
SOF
-
ORD
1 stop20h 05m
United Airlines
Deal found 1/14$530
This KLM deal was found by Cheapflights users on 1/14. 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.
Wed 2/412:46 pm
MDW
-
SOF
2 stops17h 19m
KLM
Wed 2/187:00 am
SOF
-
MDW
2 stops18h 45m
KLM
Deal found 1/14$531
This oojo deal was found by Cheapflights users on 1/13. 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 2/279:55 pm
ORD
-
SOF
1 stop11h 55m
LOT
Sun 3/82:35 pm
SOF
-
ORD
2 stops37h 20m
LOT
Deal found 1/13$533
This Mytrip deal was found by Cheapflights users on 1/15. 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.
Wed 2/1812:50 pm
ORD
-
SOF
2 stops17h 00m
Multiple Airlines
Mon 3/97:05 pm
SOF
-
ORD
2 stops26h 05m
Multiple Airlines
Deal found 1/15$534
This United Airlines deal was found by Cheapflights users on 1/14. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/210:45 am
ORD
-
SOF
2 stops16h 15m
United Airlines
Thu 8/206:30 am
SOF
-
ORD
2 stops21h 41m
United Airlines
Deal found 1/14$537
This United Airlines deal was found by Cheapflights users on 1/14. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/1211:15 am
ORD
-
SOF
2 stops15h 25m
United Airlines
Tue 8/256:10 am
SOF
-
ORD
2 stops22h 01m
United Airlines
Deal found 1/14$538
This Booking.com deal was found by Cheapflights users on 1/14. 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.
Sat 2/2811:50 am
ORD
-
SOF
1 stop25h 00m
Turkish Airlines
Sat 3/79:40 pm
SOF
-
ORD
1 stop28h 45m
Turkish Airlines
Deal found 1/14$539
This Kiwi.com deal was found by Cheapflights users on 1/14. 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 3/64:20 pm
ORD
-
SOF
1 stop11h 30m
Austrian Airlines
Fri 3/207:55 am
SOF
-
ORD
2 stops17h 56m
Austrian Airlines
Deal found 1/14$546
This United Airlines deal was found by Cheapflights users on 1/14. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/282:20 pm
ORD
-
SOF
2 stops13h 50m
United Airlines
Wed 8/266:20 am
SOF
-
ORD
2 stops24h 52m
United Airlines
Deal found 1/14$547
This Justfly.com deal was found by Cheapflights users on 1/14. 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.
Fri 8/77:50 pm
ORD
-
SOF
1 stop28h 55m
Turkish Airlines
Mon 9/79:35 am
SOF
-
ORD
1 stop20h 30m
Turkish Airlines
Deal found 1/14$548

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 15, 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

ChicagoSofia

MDW - SOF

MDWSOF

Chicago Midway

Wed 2/4

12:46 pm-2:05 pm

2 stops17h 19m

Sofia

Wed 2/18

7:00 am-5:45 pm

2 stops18h 45m

$531

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

Fri 2/27

9:55 pm-5:50 pm

1 stop11h 55m

Sofia

Sun 3/8

2:35 pm-8:55 pm

2 stops37h 20m

$533

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

Wed 2/18

12:50 pm-1:50 pm

2 stops17h 00m

Sofia

Mon 3/9

7:05 pm-2:10 pm

2 stops26h 05m

$534

St. LouisSofia

STL - SOF

STLSOF

Lambert-St Louis

Mon 3/2

6:55 pm-10:45 pm

2 stops19h 50m

Sofia

Sun 3/8

6:05 am-10:51 pm

2 stops24h 46m

$535

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

Thu 2/5

9:50 pm-10:45 pm

1 stop16h 55m

Sofia

Thu 2/19

6:00 am-5:48 pm

2 stops19h 48m

$552

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

Thu 3/5

9:55 pm-5:50 pm

1 stop11h 55m

Sofia

Mon 3/9

6:35 pm-9:00 pm

1 stop33h 25m

$556

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

Sun 3/29

9:40 pm-11:10 pm

1 stop17h 30m

Sofia

Sun 4/12

6:20 am-8:25 pm

2 stops22h 05m

$564

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

Mon 3/2

2:00 pm-1:25 pm

2 stops15h 25m

Sofia

Sun 3/8

6:05 am-6:45 pm

2 stops20h 40m

$564

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

Tue 1/20

1:00 pm-1:15 pm

2 stops16h 15m

Sofia

Sun 2/8

6:10 am-1:25 pm

1 stop15h 15m

$566

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

Wed 4/8

1:00 pm-12:10 pm

2 stops15h 10m

Sofia

Sun 4/12

6:10 am-6:15 pm

1 stop20h 05m

$568

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/14

Showing 1-10 of 41 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 11h 55m. KLM provides one of the quickest options available for as low as $533. There are 5194 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), Air Serbia ($327), 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 15, 2026.
AirlineCheapestAverageFlexibilityOn-time
Turkish AirlinesCheapest$518Average$757FlexibilityNo cancel feeOn-time77%
KLMCheapest$533Average$654FlexibilityNo cancel feeOn-time75%
United AirlinesCheapest$580Average$787FlexibilityNo cancel feeOn-time69%
Air FranceCheapest$585Average$624FlexibilityNo cancel feeOn-time77%
LOTCheapest$587Average$966FlexibilityNo cancel feeOn-time81%
LufthansaCheapest$588Average$881FlexibilityNo cancel feeOn-time76%
SWISSCheapest$593Average$817FlexibilityNo cancel feeOn-time79%
Austrian AirlinesCheapest$606Average$940FlexibilityNo cancel feeOn-time78%
British AirwaysCheapest$611Average$749FlexibilityNo cancel feeOn-time70%
Air SerbiaCheapest$621Average$933FlexibilityNo cancel feeOn-timeN/A

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