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$373+ 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 10/1. Fares are subject to change and may not be available on all flights or dates of travel.
SOF — ORD
Aug 3 — Aug 101
Sun 8/3
Sun 8/10
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 July 29, 2025.

Round-trip from

$669
(Gotogate)

One-way from

$373
(Kiwi.com)

Popular in

May

Cheapest in

November

Average price

$789
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. 5% potential increase in price ($43 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease ($23 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 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 July 29, 2025.

This Gotogate deal was found by Cheapflights users on 7/28. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/86:00 amSOF - ORD
2 stops14h 55mMultiple Airlines
Mon 9/2210:40 amORD - SOF
2 stops17h 50mMultiple Airlines
Deal found 7/28$669
This British Airways deal was found by Cheapflights users on 7/29. 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 British Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/109:30 pmSOF - ORD
1 stop26h 25mBritish Airways
Wed 9/246:55 pmORD - SOF
2 stops34h 35mBritish Airways
Deal found 7/29$671
This United Airlines deal was found by Cheapflights users on 7/29. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/126:15 amSOF - ORD
1 stop16h 40mUnited Airlines
Fri 9/193:35 pmORD - SOF
2 stops37h 30mUnited Airlines
Deal found 7/29$673
This Lufthansa deal was found by Cheapflights users on 7/28. 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 Lufthansa is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/12:20 pmSOF - ORD
1 stop13h 45mLufthansa
Tue 12/166:25 pmORD - SOF
1 stop20h 20mLufthansa
Deal found 7/28$678
This LOT deal was found by Cheapflights users on 7/28. 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 LOT is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/105:20 amSOF - ORD
1 stop22h 20mLOT
Sat 12/139:55 pmORD - SOF
1 stop11h 55mLOT
Deal found 7/28$688
This KLM deal was found by Cheapflights users on 7/29. 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.
Thu 9/117:00 amSOF - ORD
2 stops17h 20mKLM
Fri 9/262:05 pmORD - SOF
2 stops15h 55mKLM
Deal found 7/29$695
This Air Canada deal was found by Cheapflights users on 7/29. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/106:15 amSOF - ORD
2 stops21h 56mAir Canada
Sun 12/147:15 amORD - SOF
2 stops21h 55mAir Canada
Deal found 7/29$734
This KLM deal was found by Cheapflights users on 7/29. 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.
Thu 9/117:00 amSOF - MDW
2 stops18h 35mKLM
Sat 9/271:08 pmMDW - SOF
2 stops16h 52mKLM
Deal found 7/29$893
This Air France deal was found by Cheapflights users on 7/27. 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.
Sat 8/167:00 amSOF - MDW
2 stops22h 12mMultiple Airlines
Sat 9/131:08 pmMDW - SOF
2 stops16h 52mMultiple Airlines
Deal found 7/27$1,124
This Air France deal was found by Cheapflights users on 7/27. 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.
Sat 8/167:00 amSOF - MDW
2 stops22h 12mAir France
Sat 12/62:00 pmMDW - SOF
2 stops15h 55mAir France
Deal found 7/27$1,137

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 July 29, 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

Mon 9/8

6:00 am-12:55 pm

2 stops14h 55m

Chicago O'Hare Intl

Mon 9/22

10:40 am-12:30 pm

2 stops17h 50m

$669

SofiaChicago

SOF - ORD

SOFORD

Sofia

Wed 9/10

9:30 pm-3:55 pm

1 stop26h 25m

Chicago O'Hare Intl

Wed 9/24

6:55 pm-1:30 pm

2 stops34h 35m

$671

SofiaChicago

SOF - ORD

SOFORD

Sofia

Fri 9/12

2:35 pm-3:10 pm

2 stops32h 35m

Chicago O'Hare Intl

Mon 9/29

5:10 pm-5:55 pm

1 stop16h 45m

$673

SofiaChicago

SOF - ORD

SOFORD

Sofia

Mon 12/1

2:20 pm-8:05 pm

1 stop13h 45m

Chicago O'Hare Intl

Tue 12/16

6:25 pm-10:45 pm

1 stop20h 20m

$678

SofiaChicago

SOF - ORD

SOFORD

Sofia

Mon 12/1

2:20 pm-8:05 pm

1 stop13h 45m

Chicago O'Hare Intl

Tue 12/30

1:24 pm-1:50 pm

2 stops16h 26m

$683

SofiaChicago

SOF - ORD

SOFORD

Sofia

Thu 9/11

7:00 am-4:20 pm

2 stops17h 20m

Chicago O'Hare Intl

Fri 9/26

2:05 pm-2:00 pm

2 stops15h 55m

$695

SofiaChicago

SOF - ORD

SOFORD

Sofia

Wed 10/15

6:15 am-2:55 pm

2 stops16h 40m

Chicago O'Hare Intl

Fri 3/6

12:50 pm-6:15 pm

2 stops21h 25m

$709

SofiaChicago

SOF - MDW

SOFMDW

Sofia

Thu 9/11

7:00 am-5:35 pm

2 stops18h 35m

Chicago Midway

Sat 9/27

1:08 pm-2:00 pm

2 stops16h 52m

$893

SofiaChicago

SOF - MDW

SOFMDW

Sofia

Sat 8/16

7:00 am-9:12 pm

2 stops22h 12m

Chicago Midway

Sat 9/13

1:08 pm-2:00 pm

2 stops16h 52m

$1,124

SofiaChicago

SOF - MDW

SOFMDW

Sofia

Sat 8/16

7:00 am-9:12 pm

2 stops22h 12m

Chicago Midway

Sat 12/6

2:00 pm-1:55 pm

2 stops15h 55m

$1,137

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/28

Showing 1-10 of 20 results
1
2

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, August is the cheapest month in which you can book a flight from Sofia to Illinois (average of $245). Flying from Sofia to Illinois in March is currently the most expensive (average of $321). 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 July 29, 2025.

When flying from Sofia to Illinois, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

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 July 29, 2025.
See what other customers who have flown with KLM, LOT, and Air France 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
7.8
Good
1,383 reviews

Overall

7.8

Food

7.3

Crew

8.4

Boarding

7.8

Entertainment

7.1

Comfort

7.7

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
1,383 reviews
KLM
7.8
Good
1,383 reviews

Overall

7.8

Food

7.3

Crew

8.4

Boarding

7.8

Entertainment

7.1

Comfort

7.7

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.
LOT
7.6
Good
1,105 reviews
KLM
7.8
Good
1,383 reviews

Overall

7.8

Food

7.3

Crew

8.4

Boarding

7.8

Entertainment

7.1

Comfort

7.7

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
1,383 reviews

Overall

7.8

Food

7.3

Crew

8.4

Boarding

7.8

Entertainment

7.1

Comfort

7.7

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.
Qatar Airways
7.4
Good
3,609 reviews
KLM
7.8
Good
1,383 reviews

Overall

7.8

Food

7.3

Crew

8.4

Boarding

7.8

Entertainment

7.1

Comfort

7.7

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
8,896 reviews
KLM
7.8
Good
1,383 reviews

Overall

7.8

Food

7.3

Crew

8.4

Boarding

7.8

Entertainment

7.1

Comfort

7.7

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 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.

  • 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 $571. However, be on the lookout for offers from Qatar Airways and Lufthansa, 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, August is the cheapest month in which you can book a flight from Sofia to Illinois (average of $245). Flying from Sofia to Illinois in March is currently the most expensive (average of $321). 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 July 29, 2025.
AirlineCheapestAverageFlexibilityOn-time
KLMCheapest$460Average$750FlexibilityNo cancel feeOn-time75%
LOTCheapest$532Average$632FlexibilityNo cancel feeOn-time81%
Air FranceCheapest$560Average$672FlexibilityNo cancel feeOn-time77%
Austrian AirlinesCheapest$576Average$763FlexibilityNo cancel feeOn-time78%
United AirlinesCheapest$603Average$704FlexibilityNo cancel feeOn-time69%
LufthansaCheapest$616Average$762FlexibilityNo cancel feeOn-time76%
Turkish AirlinesCheapest$627Average$708FlexibilityNo cancel feeOn-time77%

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