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Sofia

$328+ 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 9/22. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — SOF
Oct 14 — Oct 211
Tue 10/14
Tue 10/21
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 September 14, 2025.

Round-trip from

$545
(Mytrip)

One-way from

$328
(Kiwi.com)

Popular in

June

Cheapest in

February

Average price

$595
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 ($270 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 September 2025
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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 September 14, 2025.

This Mytrip deal was found by Cheapflights users on 9/13. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/56:50 pmORD - SOF
2 stops15h 30mMultiple Airlines
Wed 11/196:10 amSOF - ORD
2 stops21h 50mMultiple Airlines
Deal found 9/13$545
This FlightHub deal was found by Cheapflights users on 9/13. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/2011:50 amORD - SOF
1 stop19h 20mTurkish Airlines
Sun 11/234:00 pmSOF - ORD
1 stop34h 25mTurkish Airlines
Deal found 9/13$546
This Cheapflightsfares deal was found by Cheapflights users on 9/13. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/169:50 pmORD - SOF
1 stop16h 55mLufthansa
Thu 1/156:00 amSOF - ORD
1 stop15h 10mLufthansa
Deal found 9/13$547
This British Airways deal was found by Cheapflights users on 9/12. 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 British Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/2810:45 pmORD - SOF
1 stop14h 25mBritish Airways
Wed 11/59:00 pmSOF - ORD
1 stop29h 45mBritish Airways
Deal found 9/12$548
This Expedia deal was found by Cheapflights users on 9/14. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/127:05 pmORD - SOF
1 stop11h 40mMultiple Airlines
Thu 11/66:00 amSOF - ORD
2 stops16h 55mMultiple Airlines
Deal found 9/14$549
This Mytrip deal was found by Cheapflights users on 9/13. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/287:50 pmORD - SOF
2 stops15h 30mMultiple Airlines
Tue 11/46:00 amSOF - ORD
2 stops21h 30mMultiple Airlines
Deal found 9/13$550
This United Airlines deal was found by Cheapflights users on 9/14. 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 11/29:50 pmORD - SOF
1 stop16h 55mUnited Airlines
Tue 11/186:00 amSOF - ORD
2 stops16h 55mUnited Airlines
Deal found 9/14$551
This oojo deal was found by Cheapflights users on 9/13. 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.
Sun 11/29:55 pmORD - SOF
2 stops35h 55mLOT
Sun 11/166:35 pmSOF - ORD
2 stops33h 20mLOT
Deal found 9/13$552
This United Airlines deal was found by Cheapflights users on 9/12. 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 10/281:00 pmORD - SOF
2 stops17h 15mUnited Airlines
Wed 11/56:10 amSOF - ORD
1 stop21h 55mUnited Airlines
Deal found 9/12$555
This Mytrip deal was found by Cheapflights users on 9/12. 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 10/197:05 pmORD - SOF
2 stops32h 55mMultiple Airlines
Tue 11/46:00 amSOF - ORD
2 stops21h 30mMultiple Airlines
Deal found 9/12$556
This LOT deal was found by Cheapflights users on 9/14. 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 LOT is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/79:55 pmORD - SOF
1 stop31h 55mLOT
Sat 11/222:35 pmSOF - ORD
1 stop13h 25mLOT
Deal found 9/14$557
This Air Canada deal was found by Cheapflights users on 9/12. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/1612:50 pmORD - SOF
2 stops16h 20mAir Canada
Fri 3/66:10 amSOF - ORD
2 stops21h 20mAir Canada
Deal found 9/12$558

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 September 14, 2025.
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

Mon 11/3

6:00 pm-1:15 pm

1 stop11h 15m

Sofia

Wed 11/19

6:10 am-2:55 pm

2 stops16h 45m

$551

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

Mon 11/3

6:00 pm-6:20 pm

1 stop16h 20m

Sofia

Tue 11/18

6:00 am-8:00 pm

2 stops22h 00m

$551

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

Tue 10/28

7:00 pm-1:15 pm

1 stop11h 15m

Sofia

Fri 11/7

6:10 am-8:00 pm

2 stops21h 50m

$551

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

Sun 11/2

9:50 pm-6:20 pm

1 stop12h 30m

Sofia

Fri 11/21

2:35 pm-8:05 pm

1 stop13h 30m

$551

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

Tue 11/4

6:00 pm-1:15 pm

1 stop11h 15m

Sofia

Tue 11/18

6:00 am-2:55 pm

2 stops16h 55m

$551

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

Mon 11/3

9:50 pm-10:45 pm

1 stop16h 55m

Sofia

Thu 11/20

6:00 am-8:00 pm

2 stops22h 00m

$551

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

Tue 1/13

6:00 pm-1:15 pm

1 stop11h 15m

Sofia

Tue 1/27

6:00 am-2:55 pm

2 stops16h 55m

$552

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

Tue 2/10

6:00 pm-1:15 pm

1 stop11h 15m

Sofia

Tue 2/24

6:00 am-2:55 pm

2 stops16h 55m

$552

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

Wed 3/11

7:00 pm-6:20 pm

1 stop16h 20m

Sofia

Wed 3/25

6:10 am-11:18 am

2 stops36h 08m

$552

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

Wed 1/14

9:50 pm-6:20 pm

1 stop12h 30m

Sofia

Wed 1/28

6:10 am-2:55 pm

2 stops16h 45m

$552

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/14

Showing 1-10 of 43 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 $632). Flying from Illinois to Sofia in June is currently the most expensive (average of $1,185). 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.

What is the cheapest time of day to fly from IL to SOF?

Find hourly flight availability from Illinois to Sofia. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated September 14, 2025.

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Illinois to Sofia as you normally would.

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 15m. United Airlines provides one of the quickest options available for as low as $551. 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 Air Serbia ($353), Lufthansa ($475), and Air France ($552).

  • 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 $632). Flying from Illinois to Sofia in June is currently the most expensive (average of $1,185). 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 September 14, 2025.
AirlineCheapestAverageFlexibilityOn-time
Turkish AirlinesCheapest$497Average$698FlexibilityNo cancel feeOn-time77%
Air FranceCheapest$498Average$624FlexibilityNo cancel feeOn-time77%
KLMCheapest$533Average$739FlexibilityNo cancel feeOn-time75%
LOTCheapest$569Average$905FlexibilityNo cancel feeOn-time81%
LufthansaCheapest$589Average$894FlexibilityNo cancel feeOn-time76%
SWISSCheapest$596Average$813FlexibilityNo cancel feeOn-time79%
United AirlinesCheapest$601Average$791FlexibilityNo cancel feeOn-time69%
British AirwaysCheapest$613Average$808FlexibilityNo cancel feeOn-time70%
Austrian AirlinesCheapest$613Average$997FlexibilityNo cancel feeOn-time78%
Air SerbiaCheapest$652Average$1,021FlexibilityNo cancel feeOn-timeN/A

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