HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Sofia

$244+ 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 4/28. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — SOF
Feb 7 — Feb 141
Sat 2/7
Sat 2/14
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Illinois to Sofia with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

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 8, 2026.

Most accurate provider

Justfly.com
3 stars

Most trusted provider

Justfly.com
3 stars

Round-trip from

$529
(Kiwi.com)

One-way from

$244
(Kiwi.com)

Popular in

June

Cheapest in

February

Average price

$595
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. 27% potential increase in price ($269 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 5% potential price decrease ($39 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in January 2026
Search Deals

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 8, 2026.

This Kiwi.com deal was found by Cheapflights users on 1/7. 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.
Mon 2/29:55 pmORD - SOF
2 stops28h 45mMultiple Airlines
Mon 2/166:45 amSOF - ORD
1 stop21h 10mMultiple Airlines
Deal found 1/7$529
This KAYAK deal was found by Cheapflights users on 1/7. 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.
Mon 8/106:44 pmORD - SOF
2 stops41h 56mBritish Airways
Wed 8/199:30 pmSOF - ORD
2 stops33h 52mBritish Airways
Deal found 1/7$530
This KLM deal was found by Cheapflights users on 1/7. 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 1/141:57 pmORD - SOF
2 stops16h 08mKLM
Tue 3/317:00 amSOF - ORD
2 stops18h 10mKLM
Deal found 1/7$531
This KLM deal was found by Cheapflights users on 1/7. 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 2/41:51 pmMDW - SOF
2 stops16h 14mKLM
Wed 2/117:00 amSOF - MDW
2 stops18h 29mKLM
Deal found 1/7$531
This oojo deal was found by Cheapflights users on 1/8. 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.
Mon 2/911:50 amORD - SOF
1 stop12h 55mTurkish Airlines
Mon 2/239:35 amSOF - ORD
1 stop16h 50mTurkish Airlines
Deal found 1/8$533
This United Airlines deal was found by Cheapflights users on 1/8. 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.
Mon 2/92:27 pmORD - SOF
2 stops24h 18mUnited Airlines
Mon 2/161:45 pmSOF - ORD
2 stops52h 05mUnited Airlines
Deal found 1/8$537
This FlightHub deal was found by Cheapflights users on 1/7. 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 8/46:49 pmSTL - SOF
2 stops15h 51mLufthansa
Wed 9/306:20 amSOF - STL
1 stop15h 05mLufthansa
Deal found 1/7$539
This FlightHub deal was found by Cheapflights users on 1/8. 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 3/49:55 pmORD - SOF
1 stop11h 55mLOT
Sun 3/86:35 pmSOF - ORD
2 stops33h 20mLOT
Deal found 1/8$539
This oojo deal was found by Cheapflights users on 1/8. 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 2/19:55 pmORD - SOF
2 stops31h 55mLOT
Sun 3/226:35 pmSOF - ORD
2 stops33h 20mLOT
Deal found 1/8$541
This KAYAK deal was found by Cheapflights users on 1/8. 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.
Sun 3/15:10 pmORD - SOF
1 stop15h 10mBritish Airways
Sat 3/712:05 pmSOF - ORD
1 stop33h 45mBritish Airways
Deal found 1/8$545
This Mytrip deal was found by Cheapflights users on 1/8. 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.
Sun 4/122:00 pmORD - SOF
2 stops14h 10mMultiple Airlines
Sun 4/261:50 pmSOF - ORD
1 stop14h 05mMultiple Airlines
Deal found 1/8$546
This Gurufare deal was found by Cheapflights users on 1/8. 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.
Mon 3/29:55 pmORD - SOF
1 stop31h 55mLOT
Sun 3/82:35 pmSOF - ORD
1 stop13h 25mLOT
Deal found 1/8$547

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 8, 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

ORD - SOF

ORDSOF

Chicago O'Hare Intl

Sun 2/8

2:00 pm-2:05 pm

2 stops16h 05m

Sofia

Thu 3/5

7:00 am-6:01 pm

2 stops19h 01m

$531

ChicagoSofia

MDW - SOF

MDWSOF

Chicago Midway

Wed 2/4

1:51 pm-2:05 pm

2 stops16h 14m

Sofia

Wed 2/11

7:00 am-5:29 pm

2 stops18h 29m

$531

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

Mon 2/9

2:27 pm-10:45 pm

2 stops24h 18m

Sofia

Mon 2/16

1:45 pm-9:50 am

2 stops52h 05m

$537

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

Thu 3/5

9:55 pm-1:50 pm

1 stop31h 55m

Sofia

Mon 3/9

6:35 pm-9:00 pm

1 stop33h 25m

$556

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

Fri 3/6

11:50 am-8:50 pm

1 stop25h 00m

Sofia

Mon 3/9

9:40 pm-11:05 am

1 stop20h 25m

$568

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

Sun 2/1

8:20 pm-8:50 pm

1 stop16h 30m

Sofia

Sun 3/22

4:00 pm-11:05 am

1 stop26h 05m

$569

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

Sat 4/4

2:05 pm-2:00 pm

2 stops15h 55m

Sofia

Thu 4/30

7:00 am-2:15 pm

1 stop15h 15m

$569

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

Wed 3/11

5:25 pm-2:05 pm

1 stop13h 40m

Sofia

Wed 9/9

7:00 am-2:30 pm

1 stop15h 30m

$571

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

Fri 3/6

3:20 pm-1:35 pm

1 stop14h 15m

Sofia

Tue 3/10

6:00 am-12:10 pm

1 stop13h 10m

$574

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

Fri 3/6

3:20 pm-1:35 pm

1 stop14h 15m

Sofia

Wed 3/11

2:25 pm-9:05 pm

1 stop13h 40m

$574

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/6

Showing 1-10 of 36 results
1
2
3
4

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 05m. KLM provides one of the quickest options available for as low as $531. 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), United Airlines ($305), and Air Serbia ($327).

  • 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

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Illinois to Sofia

See prices for flight routes from nearby airports that may be better suited for you.
John F Kennedy Intl to Sofia flights
O'Hare Intl to Sofia flights
Newark to Sofia flights
Boston to Sofia flights
LaGuardia to Sofia flights
Los Angeles to Sofia flights
Dulles Intl to Sofia flights
Seattle to Sofia flights
Miami to Sofia flights
San Francisco to Sofia flights
Dallas/Fort Worth to Sofia flights
Reagan-National to Sofia flights
Fort Lauderdale to Sofia flights
Santa Ana to Sofia flights
Midway to Sofia flights
Baltimore to Sofia flights
Atlanta to Sofia flights
Love Field to Sofia flights
Sky Harbor Intl to Sofia flights
Minneapolis to Sofia flights
Denver to Sofia flights
Salt Lake City to Sofia flights
Detroit to Sofia flights
Charlotte to Sofia flights
Portland to Sofia flights
Las Vegas to Sofia flights
Philadelphia to Sofia flights
San Jose to Sofia flights
Orlando to Sofia flights
Hobby to Sofia flights
George Bush Intcntl to Sofia flights
Austin to Sofia flights
Wichita to Sofia flights
Indianapolis to Sofia flights
San Diego to Sofia flights
Richmond to Sofia flights
Jacksonville to Sofia flights
West Palm Beach to Sofia flights
Oakland to Sofia flights
Grand Junction to Sofia flights
Myrtle Beach to Sofia flights
Pittsburgh to Sofia flights
St. Louis to Sofia flights
Nashville to Sofia flights
Savannah to Sofia flights
Tampa to Sofia flights
Buffalo to Sofia flights
Kansas City to Sofia flights
Cleveland to Sofia flights

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 8, 2026.
AirlineCheapestAverageFlexibilityOn-time
Turkish AirlinesCheapest$518Average$764FlexibilityNo cancel feeOn-time77%
KLMCheapest$569Average$675FlexibilityNo cancel feeOn-time75%
United AirlinesCheapest$581Average$789FlexibilityNo cancel feeOn-time69%
Air FranceCheapest$585Average$624FlexibilityNo cancel feeOn-time77%
LOTCheapest$586Average$967FlexibilityNo cancel feeOn-time81%
LufthansaCheapest$588Average$873FlexibilityNo cancel feeOn-time76%
SWISSCheapest$593Average$812FlexibilityNo cancel feeOn-time79%
Austrian AirlinesCheapest$606Average$937FlexibilityNo cancel feeOn-time78%
British AirwaysCheapest$611Average$749FlexibilityNo cancel feeOn-time70%
Air SerbiaCheapest$631Average$990FlexibilityNo cancel feeOn-timeN/A

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.