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$344+ 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 2/7. Fares are subject to change and may not be available on all flights or dates of travel.
SOF — ORD
Jan 17 — Jan 241
Sat 1/17
Sat 1/24
1 adult, Economy
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Cheap 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 December 18, 2025.

This oojo deal was found by Cheapflights users on 12/17. 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.
Tue 12/232:35 pmSOF - ORD
1 stop13h 25mLOT
Mon 1/269:55 pmORD - SOF
1 stop31h 55mLOT
Deal found 12/17$762
This FlightHub deal was found by Cheapflights users on 12/16. 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 12/172:35 pmSOF - ORD
1 stop33h 45mLOT
Sat 1/179:55 pmORD - SOF
1 stop31h 55mLOT
Deal found 12/16$763
This United Airlines deal was found by Cheapflights users on 12/17. 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 12/236:00 amSOF - ORD
1 stop17h 20mUnited Airlines
Mon 1/261:00 pmORD - SOF
2 stops16h 15mUnited Airlines
Deal found 12/17$847
This Air Canada deal was found by Cheapflights users on 12/17. 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.
Tue 12/236:00 amSOF - ORD
2 stops22h 10mAir Canada
Mon 1/2610:35 amORD - SOF
2 stops18h 40mAir Canada
Deal found 12/17$849
This United Airlines deal was found by Cheapflights users on 12/16. 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 12/222:20 pmSOF - ORD
2 stops17h 24mUnited Airlines
Wed 4/159:40 pmORD - SOF
1 stop17h 30mUnited Airlines
Deal found 12/16$852
This oojo deal was found by Cheapflights users on 12/16. 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 12/223:00 pmSOF - ORD
1 stop29h 45mSWISS
Wed 4/152:20 pmORD - SOF
1 stop11h 45mSWISS
Deal found 12/16$854

Find flight deals from Sofia to Illinois

Keep the following information in mind while searching for Sofia to Illinois flight deals. Data was last updated December 18, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$675
(LOT)

One-way from

$344
(Kiwi.com)

Popular in

January

Cheapest in

February

Average price

$841
Provider with most accurate pricing for Sofia-Chicago (CHI) flight deals.
Search Deals
Provider most trusted by Cheapflights users for Sofia-Chicago (CHI) flights.
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From Sofia to Illinois
Search Deals
One-way flight from Sofia to Illinois
Search Deals
Highest demand for flights based on searches. 5% potential increase in price ($41 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($18 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in December 2025
Search Deals

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 December 18, 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

Thu 1/15

5:00 am-5:20 pm

3 stops20h 20m

Chicago O'Hare Intl

Wed 1/28

6:30 pm-6:45 pm

2 stops16h 15m

$676

SofiaChicago

SOF - ORD

SOFORD

Sofia

Fri 1/16

7:00 am-2:20 pm

1 stop15h 20m

Chicago O'Hare Intl

Fri 1/23

5:20 pm-1:55 pm

1 stop12h 35m

$687

SofiaChicago

SOF - ORD

SOFORD

Sofia

Sat 1/17

7:00 am-2:20 pm

1 stop15h 20m

Chicago O'Hare Intl

Sun 1/25

5:20 pm-1:55 pm

1 stop12h 35m

$687

SofiaChicago

SOF - ORD

SOFORD

Sofia

Fri 1/16

7:00 am-2:20 pm

1 stop15h 20m

Chicago O'Hare Intl

Sun 1/25

5:20 pm-1:55 pm

1 stop12h 35m

$687

SofiaChicago

SOF - ORD

SOFORD

Sofia

Fri 1/30

7:00 am-2:20 pm

1 stop15h 20m

Chicago O'Hare Intl

Fri 2/6

1:58 pm-1:55 pm

2 stops15h 57m

$691

SofiaChicago

SOF - ORD

SOFORD

Sofia

Fri 1/16

7:00 am-2:20 pm

1 stop15h 20m

Chicago O'Hare Intl

Sat 1/24

12:55 pm-1:55 pm

2 stops17h 00m

$691

SofiaChicago

SOF - ORD

SOFORD

Sofia

Sat 1/17

7:00 am-2:20 pm

1 stop15h 20m

Chicago O'Hare Intl

Sat 1/24

12:55 pm-1:55 pm

2 stops17h 00m

$691

SofiaChicago

SOF - ORD

SOFORD

Sofia

Sat 1/17

7:00 am-2:20 pm

1 stop15h 20m

Chicago O'Hare Intl

Sat 1/24

4:25 pm-2:05 pm

1 stop13h 40m

$693

SofiaChicago

SOF - ORD

SOFORD

Sofia

Thu 2/5

7:10 am-3:10 pm

1 stop16h 00m

Chicago O'Hare Intl

Wed 2/18

5:20 pm-2:05 pm

1 stop12h 45m

$693

SofiaChicago

SOF - ORD

SOFORD

Sofia

Fri 4/10

5:25 am-7:50 pm

2 stops22h 25m

Chicago O'Hare Intl

Fri 5/1

5:10 pm-1:55 pm

1 stop12h 45m

$694

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/16

Showing 1-10 of 37 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 $524). Flying from Sofia to Illinois in August is currently the most expensive (average of $670). 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 December 18, 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.

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 December 18, 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
1,428 reviews

Boarding

7.8

Overall

7.7

Comfort

7.6

Crew

8.4

Entertainment

7.1

Food

7.2

Reviews

1 / 20
8.0
Excellent

Anonymous,Dec 2025

YYC - AMS

Not literally sitting in the very last row in the middle
KLM
7.7
Good
1,428 reviews
KLM
7.7
Good
1,428 reviews

Boarding

7.8

Overall

7.7

Comfort

7.6

Crew

8.4

Entertainment

7.1

Food

7.2

Reviews

1 / 20
8.0
Excellent

Anonymous,Dec 2025

YYC - AMS

Not literally sitting in the very last row in the middle
LOT
7.5
Good
1,149 reviews
KLM
7.7
Good
1,428 reviews

Boarding

7.8

Overall

7.7

Comfort

7.6

Crew

8.4

Entertainment

7.1

Food

7.2

Reviews

1 / 20
8.0
Excellent

Anonymous,Dec 2025

YYC - AMS

Not literally sitting in the very last row in the middle
United Airlines
7.4
Good
9,093 reviews
KLM
7.7
Good
1,428 reviews

Boarding

7.8

Overall

7.7

Comfort

7.6

Crew

8.4

Entertainment

7.1

Food

7.2

Reviews

1 / 20
8.0
Excellent

Anonymous,Dec 2025

YYC - AMS

Not literally sitting in the very last row in the middle
Turkish Airlines
7.3
Good
4,102 reviews
KLM
7.7
Good
1,428 reviews

Boarding

7.8

Overall

7.7

Comfort

7.6

Crew

8.4

Entertainment

7.1

Food

7.2

Reviews

1 / 20
8.0
Excellent

Anonymous,Dec 2025

YYC - AMS

Not literally sitting in the very last row in the middle
Lufthansa
6.8
Okay
7,635 reviews
KLM
7.7
Good
1,428 reviews

Boarding

7.8

Overall

7.7

Comfort

7.6

Crew

8.4

Entertainment

7.1

Food

7.2

Reviews

1 / 20
8.0
Excellent

Anonymous,Dec 2025

YYC - AMS

Not literally sitting in the very last row in the middle

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 18h 29m. Fly via KLM to get the fastest option. Airlines will cover a distance of 5198 mi.

  • What are the cheapest airlines to fly from Sofia to Illinois one-way?

    The cheapest airline one-way is Air Serbia, with whom users have recently found tickets for as low as $373. However, be on the lookout for offers from Turkish Airlines and LOT, as they are both options that can get you from Sofia to Illinois for a low price.

  • 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 $524). Flying from Sofia to Illinois in August is currently the most expensive (average of $670). 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 7 airlines flying from Sofia to Illinois

Discover the top 7 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 December 18, 2025.
AirlineCheapestAverageFlexibilityOn-time
LOTCheapest$533Average$672FlexibilityNo cancel feeOn-time81%
British AirwaysCheapest$546Average$619FlexibilityNo cancel feeOn-time70%
KLMCheapest$607Average$738FlexibilityNo cancel feeOn-time75%
Turkish AirlinesCheapest$625Average$727FlexibilityNo cancel feeOn-time77%
LufthansaCheapest$641Average$784FlexibilityNo cancel feeOn-time76%
United AirlinesCheapest$643Average$766FlexibilityNo cancel feeOn-time69%
Austrian AirlinesCheapest$647Average$781FlexibilityNo cancel feeOn-time78%

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