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$340+ 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 4/6. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — SOF
Apr 7 — Apr 141
Mon 4/7
Mon 4/14
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 2, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$601
(Air France)

One-way from

$343
(Kiwi.com)

Popular in

June

Cheapest in

February

Average price

$703
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 ($322 potential increase over avg. RT price).
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Cheapest flight prices on average. 5% potential price decrease ($42 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 2, 2025.

This Air France deal was found by Cheapflights users on 4/1. 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 Air France is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 7/145:10 pmORD - SOF
1 stop12h 50mAir France
Tue 9/167:00 amSOF - ORD
2 stops18h 39mAir France
Deal found 4/1$601
This British Airways deal was found by Cheapflights users on 4/1. 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 British Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/229:15 pmORD - SOF
1 stop15h 25mBritish Airways
Wed 4/309:30 pmSOF - ORD
1 stop28h 45mBritish Airways
Deal found 4/1$603
This KLM deal was found by Cheapflights users on 4/1. 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 KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 4/274:20 pmORD - SOF
1 stop13h 40mKLM
Thu 5/87:00 amSOF - ORD
1 stop15h 10mKLM
Deal found 4/1$604
This oojo deal was found by Cheapflights users on 3/31. 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 7/3011:25 amORD - SOF
1 stop13h 10mTurkish Airlines
Wed 9/173:35 pmSOF - ORD
1 stop14h 25mTurkish Airlines
Deal found 3/31$612
This Air Serbia deal was found by Cheapflights users on 3/31. 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.
Sat 4/1911:20 pmORD - SOF
1 stop19h 35mAir Serbia
Tue 5/134:05 pmSOF - ORD
1 stop30h 20mAir Serbia
Deal found 3/31$625
This CheapOair deal was found by Cheapflights users on 4/1. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/289:40 pmORD - SOF
1 stop13h 00mMultiple Airlines
Tue 5/136:20 amSOF - ORD
2 stops21h 52mMultiple Airlines
Deal found 4/1$631
This FlightHub deal was found by Cheapflights users on 4/1. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/286:35 pmORD - SOF
1 stop31h 30mSWISS
Wed 5/1410:50 amSOF - ORD
1 stop13h 05mSWISS
Deal found 4/1$635
This United Airlines deal was found by Cheapflights users on 4/1. 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.
Sat 5/38:25 pmORD - SOF
2 stops32h 40mUnited Airlines
Thu 5/156:15 amSOF - ORD
2 stops21h 57mUnited Airlines
Deal found 4/1$640
This Lufthansa deal was found by Cheapflights users on 4/1. 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 Lufthansa is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/24:00 pmORD - SOF
1 stop17h 50mLufthansa
Tue 4/226:00 amSOF - ORD
1 stop20h 15mLufthansa
Deal found 4/1$665
This Gotogate deal was found by Cheapflights users on 3/31. 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.
Tue 4/293:30 pmSTL - SOF
2 stops23h 30mMultiple Airlines
Tue 5/66:20 amSOF - STL
2 stops21h 38mMultiple Airlines
Deal found 3/31$695
This American Airlines deal was found by Cheapflights users on 4/1. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/39:15 pmORD - SOF
1 stop15h 05mAmerican Airlines
Fri 5/232:20 pmSOF - ORD
2 stops26h 11mAmerican Airlines
Deal found 4/1$718
This Kiwi.com deal was found by Cheapflights users on 3/31. 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.
Tue 4/295:35 pmSTL - SOF
2 stops21h 25mLufthansa
Tue 5/66:35 pmSOF - STL
1 stop26h 55mLufthansa
Deal found 3/31$726

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 2, 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 4/22

9:15 pm-8:40 pm

1 stop15h 25m

Sofia

Mon 5/5

8:00 pm-3:55 pm

1 stop27h 55m

$603

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

Sun 4/27

4:20 pm-2:00 pm

1 stop13h 40m

Sofia

Thu 5/8

7:00 am-2:10 pm

1 stop15h 10m

$604

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

Sun 4/27

1:25 pm-2:00 pm

2 stops16h 35m

Sofia

Thu 5/8

7:00 am-5:29 pm

2 stops18h 29m

$605

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

Sat 4/19

11:20 pm-2:55 am

1 stop19h 35m

Sofia

Tue 5/13

4:05 pm-2:25 pm

1 stop30h 20m

$625

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

Mon 4/28

9:40 pm-6:40 pm

1 stop13h 00m

Sofia

Tue 5/13

6:20 am-8:12 pm

2 stops21h 52m

$631

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

Mon 4/28

6:35 pm-10:05 am

1 stop31h 30m

Sofia

Wed 5/14

10:50 am-3:55 pm

1 stop13h 05m

$635

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

Sat 5/3

8:25 pm-1:05 pm

2 stops32h 40m

Sofia

Thu 5/15

6:15 am-8:12 pm

2 stops21h 57m

$640

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

Sun 4/20

11:25 am-8:35 am

1 stop13h 10m

Sofia

Wed 5/7

9:25 am-9:40 am

1 stop32h 15m

$688

St. LouisSofia

STL - SOF

STLSOF

Lambert-St Louis

Tue 4/29

3:30 pm-11:00 pm

2 stops23h 30m

Sofia

Tue 5/6

6:20 am-7:58 pm

2 stops21h 38m

$695

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

Sat 5/3

9:15 pm-8:20 pm

1 stop15h 05m

Sofia

Fri 5/23

2:20 pm-8:31 am

2 stops26h 11m

$718

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/1

Showing 1-10 of 29 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 2, 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 2, 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
1,323 reviews

Crew

8.4

Entertainment

7.2

Boarding

7.8

Overall

7.8

Food

7.3

Comfort

7.7

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
1,323 reviews
KLM
7.8
Good
1,323 reviews

Crew

8.4

Entertainment

7.2

Boarding

7.8

Overall

7.8

Food

7.3

Comfort

7.7

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
1,323 reviews

Crew

8.4

Entertainment

7.2

Boarding

7.8

Overall

7.8

Food

7.3

Comfort

7.7

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
771 reviews
KLM
7.8
Good
1,323 reviews

Crew

8.4

Entertainment

7.2

Boarding

7.8

Overall

7.8

Food

7.3

Comfort

7.7

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
1,572 reviews
KLM
7.8
Good
1,323 reviews

Crew

8.4

Entertainment

7.2

Boarding

7.8

Overall

7.8

Food

7.3

Comfort

7.7

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
7.4
Good
1,427 reviews
KLM
7.8
Good
1,323 reviews

Crew

8.4

Entertainment

7.2

Boarding

7.8

Overall

7.8

Food

7.3

Comfort

7.7

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 Turkish Airlines ($527), Austrian Airlines ($552), and KLM ($580).

  • 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 $1,243). 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 2, 2025.
AirlineCheapestAverageFlexibilityOn-time
Turkish AirlinesCheapest$500Average$782FlexibilityNo cancel feeOn-time77%
LOTCheapest$577Average$875FlexibilityNo cancel feeOn-time81%
KLMCheapest$578Average$738FlexibilityNo cancel feeOn-time75%
Austrian AirlinesCheapest$614Average$1,046FlexibilityNo cancel feeOn-time78%
United AirlinesCheapest$616Average$869FlexibilityNo cancel feeOn-time69%
LufthansaCheapest$616Average$1,028FlexibilityNo cancel feeOn-time76%
British AirwaysCheapest$627Average$927FlexibilityNo cancel feeOn-time70%
Air SerbiaCheapest$658Average$1,061FlexibilityNo cancel feeOn-timeN/A
ITA AirwaysCheapest$673Average$865FlexibilityNo cancel feeOn-time81%
Air CanadaCheapest$682Average$962FlexibilityNo cancel feeOn-time67%

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