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$347+ 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 5/5. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — SOF
Apr 22 — Apr 291
Tue 4/22
Tue 4/29
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 April 17, 2025.

Most accurate provider

AranGrant
3 stars

Most trusted provider

AranGrant
3 stars

Round-trip from

$617
(CrystalTravel)

One-way from

$347
(Kiwi.com)

Popular in

June

Cheapest in

February

Average price

$621
Provider with most accurate pricing for Chicago (CHI)-Sofia flight deals.
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Provider most trusted by Cheapflights users for Chicago (CHI)-Sofia flights.
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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. 29% potential increase in price ($324 potential increase over avg. RT price).
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Cheapest flight prices on average. 5% potential price decrease ($40 potential savings vs. average RT price).
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Average for round-trip flights in April 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 April 17, 2025.

This FlightHub deal was found by Cheapflights users on 4/17. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/2911:45 pmORD - SOF
1 stop24h 50mTurkish Airlines
Tue 10/79:25 amSOF - ORD
1 stop32h 15mTurkish Airlines
Deal found 4/17$620
This Air Serbia deal was found by Cheapflights users on 4/16. 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 Air Serbia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/64:30 pmORD - SOF
1 stop15h 05mAir Serbia
Tue 9/24:05 pmSOF - ORD
1 stop30h 20mAir Serbia
Deal found 4/16$622
This StudentUniverse deal was found by Cheapflights users on 4/15. 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 StudentUniverse is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/264:20 pmORD - SOF
1 stop15h 00mMultiple Airlines
Sun 9/76:20 amSOF - ORD
1 stop14h 35mMultiple Airlines
Deal found 4/15$623
This Kiwi.com deal was found by Cheapflights users on 4/16. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 4/276:35 pmORD - SOF
1 stop12h 10mSWISS
Mon 5/53:30 pmSOF - ORD
1 stop28h 40mSWISS
Deal found 4/16$624
This CrystalTravel deal was found by Cheapflights users on 4/16. 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 CrystalTravel is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/43:35 pmORD - SOF
1 stop12h 25mLufthansa
Mon 8/257:25 pmSOF - ORD
1 stop25h 05mLufthansa
Deal found 4/16$625
This oojo deal was found by Cheapflights users on 4/16. 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.
Wed 4/239:40 pmORD - SOF
1 stop12h 15mLOT
Mon 9/292:35 pmSOF - ORD
1 stop32h 35mLOT
Deal found 4/16$637
This Air Canada deal was found by Cheapflights users on 4/15. 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 5/1812:00 pmORD - SOF
2 stops16h 00mAir Canada
Wed 5/286:15 amSOF - ORD
2 stops21h 57mAir Canada
Deal found 4/15$641
This United Airlines deal was found by Cheapflights users on 4/15. 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.
Wed 4/235:50 pmORD - SOF
1 stop21h 10mUnited Airlines
Wed 5/76:00 amSOF - ORD
1 stop14h 30mUnited Airlines
Deal found 4/15$645
This StudentUniverse deal was found by Cheapflights users on 4/15. 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 StudentUniverse is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 4/274:20 pmORD - SOF
1 stop11h 20mAustrian Airlines
Sat 5/108:00 amSOF - ORD
1 stop13h 20mAustrian Airlines
Deal found 4/15$646
This Air France deal was found by Cheapflights users on 4/15. 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 4/245:10 pmORD - SOF
1 stop12h 50mAir France
Tue 5/67:00 amSOF - ORD
1 stop16h 00mAir France
Deal found 4/15$654
This Air Canada deal was found by Cheapflights users on 4/15. 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 8/171:30 pmSTL - SOF
2 stops21h 10mAir Canada
Thu 9/46:00 amSOF - STL
2 stops45h 57mAir Canada
Deal found 4/15$659
This British Airways deal was found by Cheapflights users on 4/15. 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.
Sun 4/279:15 pmORD - SOF
1 stop13h 55mBritish Airways
Sun 5/119:10 pmSOF - ORD
1 stop24h 40mBritish Airways
Deal found 4/15$664

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 April 17, 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 9/29

11:45 pm-8:35 am

1 stop24h 50m

Sofia

Tue 10/7

9:25 am-9:40 am

1 stop32h 15m

$620

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

Wed 8/6

4:30 pm-3:35 pm

1 stop15h 05m

Sofia

Tue 9/2

4:05 pm-2:25 pm

1 stop30h 20m

$622

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

Tue 8/26

4:20 pm-3:20 pm

1 stop15h 00m

Sofia

Sun 9/7

6:20 am-12:55 pm

1 stop14h 35m

$623

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

Sun 4/27

6:35 pm-2:45 pm

1 stop12h 10m

Sofia

Mon 5/5

3:30 pm-12:10 pm

1 stop28h 40m

$624

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

Mon 8/4

3:35 pm-12:00 pm

1 stop12h 25m

Sofia

Mon 8/25

7:25 pm-12:30 pm

1 stop25h 05m

$625

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

Tue 5/20

12:00 pm-12:00 pm

2 stops16h 00m

Sofia

Tue 5/27

6:20 am-8:12 pm

2 stops21h 52m

$639

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

Sun 5/18

12:00 pm-12:00 pm

2 stops16h 00m

Sofia

Wed 5/28

6:15 am-8:12 pm

2 stops21h 57m

$641

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

Sun 4/27

4:20 pm-11:40 am

1 stop11h 20m

Sofia

Sat 5/10

8:00 am-1:20 pm

1 stop13h 20m

$646

St. LouisSofia

STL - SOF

STLSOF

Lambert-St Louis

Sun 8/17

1:30 pm-6:40 pm

2 stops21h 10m

Sofia

Thu 9/4

6:00 am-7:57 pm

2 stops45h 57m

$659

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

Sun 4/27

9:15 pm-7:10 pm

1 stop13h 55m

Sofia

Sun 5/11

9:10 pm-1:50 pm

1 stop24h 40m

$664

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/16

Showing 1-10 of 34 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 $1,243). 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 April 17, 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.

Rainfall in Sofia by month

Plan your trip to Sofia by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Sofia ranges from 1.2 - 2.8 inches per month. June is typically the wettest month, when rainfall can reach 2.8 in. January is typically the driest time to visit Sofia when rainfall is around 1.2 in.

Temperature in Sofia by month

Plan your trip to Sofia by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Sofia, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 68.0 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 30.2 F).

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 April 17, 2025.
Peruse reviews from past customers who have flown with KLM, LOT and Austrian Airlines from Illinois to Sofia to help guide your decision. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
KLM
7.8
Good
1,329 reviews

Entertainment

7.1

Boarding

7.8

Crew

8.4

Overall

7.8

Comfort

7.7

Food

7.3

Reviews

1 / 20
8.0
Excellent

Anonymous,Mar 2025

LBA - AMS

Overall, the flight from Leeds Bradford to Amsterdam was at expected. The crew were efficient at boarding and professional on board. The only issue was extremely slow check in at Leeds Bradford which was very frustrating.
KLM
7.8
Good
1,329 reviews
KLM
7.8
Good
1,329 reviews

Entertainment

7.1

Boarding

7.8

Crew

8.4

Overall

7.8

Comfort

7.7

Food

7.3

Reviews

1 / 20
8.0
Excellent

Anonymous,Mar 2025

LBA - AMS

Overall, the flight from Leeds Bradford to Amsterdam was at expected. The crew were efficient at boarding and professional on board. The only issue was extremely slow check in at Leeds Bradford which was very frustrating.
LOT
7.6
Good
1,065 reviews
KLM
7.8
Good
1,329 reviews

Entertainment

7.1

Boarding

7.8

Crew

8.4

Overall

7.8

Comfort

7.7

Food

7.3

Reviews

1 / 20
8.0
Excellent

Anonymous,Mar 2025

LBA - AMS

Overall, the flight from Leeds Bradford to Amsterdam was at expected. The crew were efficient at boarding and professional on board. The only issue was extremely slow check in at Leeds Bradford which was very frustrating.
Austrian Airlines
7.6
Good
775 reviews
KLM
7.8
Good
1,329 reviews

Entertainment

7.1

Boarding

7.8

Crew

8.4

Overall

7.8

Comfort

7.7

Food

7.3

Reviews

1 / 20
8.0
Excellent

Anonymous,Mar 2025

LBA - AMS

Overall, the flight from Leeds Bradford to Amsterdam was at expected. The crew were efficient at boarding and professional on board. The only issue was extremely slow check in at Leeds Bradford which was very frustrating.
Air France
7.5
Good
1,435 reviews
KLM
7.8
Good
1,329 reviews

Entertainment

7.1

Boarding

7.8

Crew

8.4

Overall

7.8

Comfort

7.7

Food

7.3

Reviews

1 / 20
8.0
Excellent

Anonymous,Mar 2025

LBA - AMS

Overall, the flight from Leeds Bradford to Amsterdam was at expected. The crew were efficient at boarding and professional on board. The only issue was extremely slow check in at Leeds Bradford which was very frustrating.
SWISS
7.5
Good
1,580 reviews
KLM
7.8
Good
1,329 reviews

Entertainment

7.1

Boarding

7.8

Crew

8.4

Overall

7.8

Comfort

7.7

Food

7.3

Reviews

1 / 20
8.0
Excellent

Anonymous,Mar 2025

LBA - AMS

Overall, the flight from Leeds Bradford to Amsterdam was at expected. The crew were efficient at boarding and professional on board. The only issue was extremely slow check in at Leeds Bradford which was very frustrating.

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 Air Serbia ($388), Lufthansa ($489), and Air Canada ($490).

  • What are the most popular routes from Illinois to Sofia?

    While some choose either Lambert-St Louis - Sofia or Chicago Midway - 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 $1,243). 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 April 17, 2025.
AirlineCheapestAverageFlexibilityOn-time
Turkish AirlinesCheapest$500Average$786FlexibilityNo cancel feeOn-time77%
LOTCheapest$577Average$878FlexibilityNo cancel feeOn-time81%
KLMCheapest$578Average$739FlexibilityNo cancel feeOn-time75%
Austrian AirlinesCheapest$614Average$1,026FlexibilityNo cancel feeOn-time78%
LufthansaCheapest$614Average$990FlexibilityNo cancel feeOn-time76%
United AirlinesCheapest$616Average$862FlexibilityNo cancel feeOn-time69%
British AirwaysCheapest$628Average$925FlexibilityNo cancel feeOn-time70%
SWISSCheapest$643Average$1,087FlexibilityNo cancel feeOn-time79%
Air SerbiaCheapest$652Average$1,044FlexibilityNo cancel feeOn-timeN/A
ITA AirwaysCheapest$679Average$865FlexibilityNo cancel feeOn-time81%

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