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$335+ Cheap flights from Sofia (SOF) to Illinois

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 1/10. Fares are subject to change and may not be available on all flights or dates of travel.
SOF — ORD
Nov 29 — Dec 61
Sat 11/29
Sat 12/6
1 adult, Economy
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Cheap flight deals from Sofia to Illinois

Keep the following information in mind while searching for Sofia to Illinois flight deals. Data was last updated October 30, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$643
(Booking.com)

One-way from

$335
(Kiwi.com)

Popular in

May

Cheapest in

February

Average price

$762
Provider with most accurate pricing for Sofia-Chicago (CHI) flight deals.
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Provider most trusted by Cheapflights users for Sofia-Chicago (CHI) flights.
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From Sofia to Illinois
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One-way flight from Sofia to Illinois
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Highest demand for flights based on searches. 3% potential increase in price ($23 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($20 potential savings vs. average RT price).
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Average for round-trip flights in October 2025
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Find flight deals from Sofia to Illinois

Cheapest flights from Sofia to Illinois
Explore the most affordable flight options available from Sofia to Illinois. Find the lowest fares from popular airlines and budget airlines, with prices last updated on October 30, 2025.

This Booking.com deal was found by Cheapflights users on 10/30. 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.
Sun 12/146:35 pmSOF - ORD
2 stops33h 20mLOT
Tue 12/309:55 pmORD - SOF
1 stop11h 55mLOT
Deal found 10/30$643
This Mytrip deal was found by Cheapflights users on 10/29. 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.
Sat 11/89:45 amSOF - ORD
2 stops15h 35mMultiple Airlines
Sat 11/156:30 pmORD - SOF
2 stops16h 20mMultiple Airlines
Deal found 10/29$657
This oojo deal was found by Cheapflights users on 10/29. 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 11/219:35 amSOF - ORD
1 stop16h 50mTurkish Airlines
Fri 12/511:50 amORD - SOF
1 stop25h 00mTurkish Airlines
Deal found 10/29$688
This FlightHub deal was found by Cheapflights users on 10/28. 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 11/276:35 pmSOF - ORD
1 stop33h 25mLOT
Thu 12/49:55 pmORD - SOF
1 stop11h 55mLOT
Deal found 10/28$695
This oojo deal was found by Cheapflights users on 10/29. 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 12/226:35 pmSOF - ORD
1 stop33h 25mLOT
Wed 4/159:40 pmORD - SOF
1 stop20h 20mLOT
Deal found 10/29$696
This British Airways deal was found by Cheapflights users on 10/28. 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.
Sat 12/612:05 pmSOF - ORD
1 stop14h 40mBritish Airways
Thu 5/285:00 pmORD - SOF
1 stop12h 30mBritish Airways
Deal found 10/28$700
This Kiwi.com deal was found by Cheapflights users on 10/29. 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 11/212:35 pmSOF - ORD
1 stop13h 30mLufthansa
Thu 12/410:35 pmORD - SOF
2 stops16h 10mLufthansa
Deal found 10/29$708
This United Airlines deal was found by Cheapflights users on 10/28. 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 11/256:00 amSOF - ORD
2 stops16h 55mUnited Airlines
Tue 12/26:00 pmORD - SOF
1 stop11h 15mUnited Airlines
Deal found 10/28$717
This United Airlines deal was found by Cheapflights users on 10/28. 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 12/146:10 amSOF - ORD
1 stop21h 55mUnited Airlines
Tue 12/307:05 amORD - SOF
2 stops22h 40mUnited Airlines
Deal found 10/28$719
This KLM deal was found by Cheapflights users on 10/29. 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 12/27:00 amSOF - MDW
2 stops19h 00mMultiple Airlines
Sat 12/61:50 pmMDW - SOF
2 stops16h 05mMultiple Airlines
Deal found 10/29$1,069
This KLM deal was found by Cheapflights users on 10/29. 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.
Fri 10/317:00 amSOF - MDW
2 stops17h 55mMultiple Airlines
Fri 12/51:14 pmMDW - SOF
2 stops16h 41mMultiple Airlines
Deal found 10/29$1,335
This Air France deal was found by Cheapflights users on 10/28. 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 France is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/307:00 amSOF - MDW
2 stops18h 25mMultiple Airlines
Mon 12/2912:45 pmMDW - SOF
2 stops17h 20mMultiple Airlines
Deal found 10/28$1,522

Cheapflights Fare Finder

 
Customize your flight search to find flights from Sofia to Illinois 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 October 30, 2025.
Use the filters below to find and compare flights from Sofia to Illinois that are best for you.

Fly from

Sofia

Fly to

Illinois

Route

Depart

Return

Price

SofiaChicago

SOF - ORD

SOFORD

Sofia

Wed 2/25

9:00 pm-1:50 pm

1 stop24h 50m

Chicago O'Hare Intl

Sat 5/16

5:10 pm-8:20 pm

2 stops19h 10m

$699

SofiaChicago

SOF - ORD

SOFORD

Sofia

Sat 12/6

12:05 pm-6:45 pm

1 stop14h 40m

Chicago O'Hare Intl

Sat 5/30

7:05 pm-8:20 pm

1 stop17h 15m

$700

SofiaChicago

SOF - ORD

SOFORD

Sofia

Sun 12/7

2:30 pm-1:50 pm

1 stop31h 20m

Chicago O'Hare Intl

Sat 5/30

7:05 pm-8:20 pm

1 stop17h 15m

$700

SofiaChicago

SOF - ORD

SOFORD

Sofia

Sun 12/14

6:10 am-8:05 pm

1 stop21h 55m

Chicago O'Hare Intl

Tue 12/30

7:05 am-1:45 pm

2 stops22h 40m

$719

SofiaChicago

SOF - ORD

SOFORD

Sofia

Thu 2/5

6:00 am-2:55 pm

2 stops16h 55m

Chicago O'Hare Intl

Wed 4/1

9:40 pm-11:00 pm

1 stop17h 20m

$719

SofiaChicago

SOF - ORD

SOFORD

Sofia

Sun 12/7

6:10 am-1:10 pm

1 stop15h 00m

Chicago O'Hare Intl

Thu 5/28

7:30 am-11:05 am

2 stops19h 35m

$720

SofiaChicago

SOF - ORD

SOFORD

Sofia

Sun 12/7

2:25 pm-8:05 pm

1 stop13h 40m

Chicago O'Hare Intl

Fri 5/29

10:50 am-1:15 pm

2 stops18h 25m

$720

SofiaChicago

SOF - ORD

SOFORD

Sofia

Thu 12/4

6:00 am-1:10 pm

1 stop15h 10m

Chicago O'Hare Intl

Fri 5/29

7:30 am-11:05 am

2 stops19h 35m

$720

SofiaChicago

SOF - ORD

SOFORD

Sofia

Tue 12/2

6:00 am-11:10 am

1 stop13h 10m

Chicago O'Hare Intl

Wed 5/27

7:30 am-11:05 am

2 stops19h 35m

$720

SofiaChicago

SOF - ORD

SOFORD

Sofia

Thu 11/27

6:00 am-6:45 pm

2 stops20h 45m

Chicago O'Hare Intl

Thu 12/4

10:35 am-1:50 pm

2 stops19h 15m

$720

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/29

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

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

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

Currently, February is the cheapest month in which you can book a flight from Sofia to Illinois (average of $525). Flying from Sofia to Illinois in August is currently the most expensive (average of $672). 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 SOF to IL?

Find hourly flight availability from Sofia to Illinois. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated October 30, 2025.

When flying from Sofia to Illinois, the time of day you fly usually plays a role in the price. Save by searching for a flight at noon, which can drop the price by up to 15% versus a flight in the morning.

How much does it cost to fly round-trip from Sofia to Illinois?

Reviews of airlines servicing Illinois

Get insights into the airlines that provide service to Illinois. 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 Illinois. Reviews last updated October 30, 2025.
See what other customers who have flown with KLM, LOT, and United Airlines from Sofia to Illinois have to say. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
KLM
7.7
Good
1,406 reviews

Comfort

7.7

Entertainment

7.1

Crew

8.4

Overall

7.7

Boarding

7.8

Food

7.3

Reviews

1 / 20
2.0
Mediocre

Abisola,Oct 2025

LOS - CDG

The food option was finished and what wa left was vegan pasta so I had to go without food for an 8 hour flight without any sort of empathy from crew that was mean.
KLM
7.7
Good
1,406 reviews
KLM
7.7
Good
1,406 reviews

Comfort

7.7

Entertainment

7.1

Crew

8.4

Overall

7.7

Boarding

7.8

Food

7.3

Reviews

1 / 20
2.0
Mediocre

Abisola,Oct 2025

LOS - CDG

The food option was finished and what wa left was vegan pasta so I had to go without food for an 8 hour flight without any sort of empathy from crew that was mean.
LOT
7.6
Good
1,135 reviews
KLM
7.7
Good
1,406 reviews

Comfort

7.7

Entertainment

7.1

Crew

8.4

Overall

7.7

Boarding

7.8

Food

7.3

Reviews

1 / 20
2.0
Mediocre

Abisola,Oct 2025

LOS - CDG

The food option was finished and what wa left was vegan pasta so I had to go without food for an 8 hour flight without any sort of empathy from crew that was mean.
United Airlines
7.4
Good
8,998 reviews
KLM
7.7
Good
1,406 reviews

Comfort

7.7

Entertainment

7.1

Crew

8.4

Overall

7.7

Boarding

7.8

Food

7.3

Reviews

1 / 20
2.0
Mediocre

Abisola,Oct 2025

LOS - CDG

The food option was finished and what wa left was vegan pasta so I had to go without food for an 8 hour flight without any sort of empathy from crew that was mean.
Turkish Airlines
7.3
Good
4,031 reviews
KLM
7.7
Good
1,406 reviews

Comfort

7.7

Entertainment

7.1

Crew

8.4

Overall

7.7

Boarding

7.8

Food

7.3

Reviews

1 / 20
2.0
Mediocre

Abisola,Oct 2025

LOS - CDG

The food option was finished and what wa left was vegan pasta so I had to go without food for an 8 hour flight without any sort of empathy from crew that was mean.
Lufthansa
6.8
Okay
7,541 reviews
KLM
7.7
Good
1,406 reviews

Comfort

7.7

Entertainment

7.1

Crew

8.4

Overall

7.7

Boarding

7.8

Food

7.3

Reviews

1 / 20
2.0
Mediocre

Abisola,Oct 2025

LOS - CDG

The food option was finished and what wa left was vegan pasta so I had to go without food for an 8 hour flight without any sort of empathy from crew that was mean.

Related info for your journey

Find useful and relevant information for your journey from Sofia to Illinois. 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 from for flights from Sofia to Illinois?

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

  • How long is the flight from Sofia to Illinois?

    There are many flights that can get you from Sofia to Illinois in 21h 55m. Fly via British Airways or United Airlines to get the fastest option. Airlines will cover a distance of 5194 mi. This flight may include one or multiple stops.

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

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

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

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

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

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

    Currently, February is the cheapest month in which you can book a flight from Sofia to Illinois (average of $525). Flying from Sofia to Illinois in August is currently the most expensive (average of $672). 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 Sofia to Illinois

See prices for flight routes from nearby airports that may be better suited for you.
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Top 8 airlines flying from Sofia to Illinois

Discover the top 8 airlines that operate flights from Sofia to Illinois. 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 October 30, 2025.
AirlineCheapestAverageFlexibilityOn-time
LOTCheapest$532Average$653FlexibilityNo cancel feeOn-time81%
British AirwaysCheapest$546Average$619FlexibilityNo cancel feeOn-time70%
Air FranceCheapest$560Average$670FlexibilityNo cancel feeOn-time77%
KLMCheapest$604Average$745FlexibilityNo cancel feeOn-time75%
Turkish AirlinesCheapest$625Average$716FlexibilityNo cancel feeOn-time77%
LufthansaCheapest$630Average$767FlexibilityNo cancel feeOn-time76%
United AirlinesCheapest$641Average$766FlexibilityNo cancel feeOn-time69%
Austrian AirlinesCheapest$654Average$796FlexibilityNo cancel feeOn-time78%

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