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Sofia

$268+ 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 10/15. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — SOF
Jul 8 — Jul 151
Tue 7/8
Tue 7/15
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 July 3, 2025.

Round-trip from

$612
(SWISS)

One-way from

$268
(Kiwi.com)

Popular in

June

Cheapest in

February

Average price

$987
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 ($290 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 July 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 July 3, 2025.

This SWISS deal was found by Cheapflights users on 7/3. 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 SWISS is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/157:05 pmORD - SOF
2 stops32h 55mSWISS
Tue 8/2612:45 pmSOF - ORD
2 stops31h 25mSWISS
Deal found 7/3$612
This Air Canada deal was found by Cheapflights users on 7/3. 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.
Wed 8/69:55 amORD - SOF
2 stops17h 20mAir Canada
Tue 8/266:00 amSOF - ORD
2 stops35h 52mAir Canada
Deal found 7/3$613
This Lufthansa deal was found by Cheapflights users on 7/3. 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 Lufthansa is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/99:40 pmORD - SOF
1 stop17h 20mLufthansa
Thu 8/286:00 amSOF - ORD
2 stops21h 55mLufthansa
Deal found 7/3$614
This United Airlines deal was found by Cheapflights users on 7/1. 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.
Thu 9/113:05 pmORD - SOF
1 stop12h 10mUnited Airlines
Mon 9/2912:00 pmSOF - ORD
1 stop31h 00mUnited Airlines
Deal found 7/1$615
This Turkish Airlines deal was found by Cheapflights users on 7/2. 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 Turkish Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/2611:25 amORD - SOF
1 stop25h 00mTurkish Airlines
Tue 9/93:35 pmSOF - ORD
1 stop34h 20mTurkish Airlines
Deal found 7/2$621
This CheapOair deal was found by Cheapflights users on 7/3. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/238:40 amORD - SOF
2 stops17h 25mMultiple Airlines
Wed 8/2010:50 amSOF - ORD
1 stop33h 20mMultiple Airlines
Deal found 7/3$626
This ITA Airways deal was found by Cheapflights users on 7/1. 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 ITA Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 7/133:00 pmORD - SOF
1 stop13h 00mITA Airways
Fri 9/196:00 pmSOF - ORD
1 stop27h 10mITA Airways
Deal found 7/1$632
This KLM deal was found by Cheapflights users on 7/2. 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.
Tue 8/54:20 pmORD - SOF
1 stop13h 40mKLM
Wed 8/277:00 amSOF - ORD
1 stop15h 40mKLM
Deal found 7/2$638
This KLM deal was found by Cheapflights users on 7/2. 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 8/201:08 pmMDW - SOF
2 stops16h 52mKLM
Wed 8/277:00 amSOF - MDW
2 stops18h 37mKLM
Deal found 7/2$645
This Gotogate deal was found by Cheapflights users on 7/3. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/179:15 amSTL - SOF
2 stops18h 45mMultiple Airlines
Sun 8/316:20 amSOF - STL
1 stop15h 10mMultiple Airlines
Deal found 7/3$677
This Travelocity deal was found by Cheapflights users on 7/3. 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 Travelocity is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/315:30 pmSTL - SOF
2 stops35h 30mLufthansa
Sun 9/146:20 amSOF - STL
1 stop15h 10mLufthansa
Deal found 7/3$711
This United Airlines deal was found by Cheapflights users on 7/3. 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 8/314:00 pmSTL - SOF
2 stops41h 50mUnited Airlines
Sun 9/148:00 amSOF - STL
2 stops17h 52mUnited Airlines
Deal found 7/3$723

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 July 3, 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

Tue 7/15

7:05 pm-12:00 pm

2 stops32h 55m

Sofia

Tue 8/26

12:45 pm-12:10 pm

2 stops31h 25m

$612

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

Wed 8/6

9:55 am-11:15 am

2 stops17h 20m

Sofia

Tue 8/26

6:00 am-9:52 am

2 stops35h 52m

$613

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

Sat 8/9

9:40 pm-11:00 pm

1 stop17h 20m

Sofia

Thu 8/28

6:00 am-7:55 pm

2 stops21h 55m

$614

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

Thu 9/11

3:05 pm-11:15 am

1 stop12h 10m

Sofia

Mon 9/29

12:00 pm-11:00 am

1 stop31h 00m

$615

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

Tue 8/26

11:25 am-8:25 pm

1 stop25h 00m

Sofia

Wed 9/3

9:15 pm-9:40 am

1 stop20h 25m

$621

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

Wed 7/23

8:40 am-10:05 am

2 stops17h 25m

Sofia

Wed 8/20

10:50 am-12:10 pm

1 stop33h 20m

$626

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

Sun 7/13

3:00 pm-12:00 pm

1 stop13h 00m

Sofia

Sun 9/21

6:00 pm-1:10 pm

1 stop27h 10m

$632

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

Tue 8/5

1:30 pm-2:00 pm

2 stops16h 30m

Sofia

Wed 8/27

7:00 am-2:40 pm

1 stop15h 40m

$638

ChicagoSofia

MDW - SOF

MDWSOF

Chicago Midway

Wed 8/20

1:08 pm-2:00 pm

2 stops16h 52m

Sofia

Wed 8/27

7:00 am-5:37 pm

2 stops18h 37m

$645

St. LouisSofia

STL - SOF

STLSOF

Lambert-St Louis

Sun 8/17

9:15 am-12:00 pm

2 stops18h 45m

Sofia

Sun 8/31

6:20 am-1:30 pm

1 stop15h 10m

$677

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/1

Showing 1-10 of 24 results
1
2
3

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 $1,189). 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 July 3, 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.

Reviews of airlines servicing Sofia

Get insights into the airlines that provide service to Sofia. 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 Sofia. Reviews last updated July 3, 2025.
Get a feel of what it's like to fly with KLM, Air France, and SWISS from Illinois to Sofia by reading reviews from past customers. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
KLM
7.8
Good
1,367 reviews

Boarding

7.8

Entertainment

7.1

Comfort

7.7

Food

7.2

Overall

7.8

Crew

8.4

Reviews

1 / 20
4.0
Okay

Anonymous,Jun 2025

AMS - BOS

A two and half hour delay caused havoc with all connections. Otherwise on board service was great.
KLM
7.8
Good
1,367 reviews
KLM
7.8
Good
1,367 reviews

Boarding

7.8

Entertainment

7.1

Comfort

7.7

Food

7.2

Overall

7.8

Crew

8.4

Reviews

1 / 20
4.0
Okay

Anonymous,Jun 2025

AMS - BOS

A two and half hour delay caused havoc with all connections. Otherwise on board service was great.
Air France
7.5
Good
1,465 reviews
KLM
7.8
Good
1,367 reviews

Boarding

7.8

Entertainment

7.1

Comfort

7.7

Food

7.2

Overall

7.8

Crew

8.4

Reviews

1 / 20
4.0
Okay

Anonymous,Jun 2025

AMS - BOS

A two and half hour delay caused havoc with all connections. Otherwise on board service was great.
SWISS
7.5
Good
1,654 reviews
KLM
7.8
Good
1,367 reviews

Boarding

7.8

Entertainment

7.1

Comfort

7.7

Food

7.2

Overall

7.8

Crew

8.4

Reviews

1 / 20
4.0
Okay

Anonymous,Jun 2025

AMS - BOS

A two and half hour delay caused havoc with all connections. Otherwise on board service was great.
United Airlines
7.4
Good
8,861 reviews
KLM
7.8
Good
1,367 reviews

Boarding

7.8

Entertainment

7.1

Comfort

7.7

Food

7.2

Overall

7.8

Crew

8.4

Reviews

1 / 20
4.0
Okay

Anonymous,Jun 2025

AMS - BOS

A two and half hour delay caused havoc with all connections. Otherwise on board service was great.
Turkish Airlines
7.3
Good
3,895 reviews
KLM
7.8
Good
1,367 reviews

Boarding

7.8

Entertainment

7.1

Comfort

7.7

Food

7.2

Overall

7.8

Crew

8.4

Reviews

1 / 20
4.0
Okay

Anonymous,Jun 2025

AMS - BOS

A two and half hour delay caused havoc with all connections. Otherwise on board service was great.

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.

  • 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 Lufthansa ($347), SWISS ($351), and Air Canada ($354).

  • 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 $1,189). 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 July 3, 2025.
AirlineCheapestAverageFlexibilityOn-time
Turkish AirlinesCheapest$494Average$813FlexibilityNo cancel feeOn-time77%
Air FranceCheapest$498Average$608FlexibilityNo cancel feeOn-time77%
KLMCheapest$533Average$739FlexibilityNo cancel feeOn-time75%
LOTCheapest$572Average$883FlexibilityNo cancel feeOn-time81%
SWISSCheapest$596Average$904FlexibilityNo cancel feeOn-time79%
LufthansaCheapest$598Average$937FlexibilityNo cancel feeOn-time76%
Austrian AirlinesCheapest$605Average$874FlexibilityNo cancel feeOn-time78%
British AirwaysCheapest$613Average$778FlexibilityNo cancel feeOn-time70%
United AirlinesCheapest$616Average$802FlexibilityNo cancel feeOn-time69%
Air SerbiaCheapest$652Average$1,020FlexibilityNo cancel feeOn-timeN/A

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