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Sofia

$287+ 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 5/9. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — SOF
Feb 4 — Feb 111
Tue 2/4
Tue 2/11
1 adult, Economy
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Cheap flight deals from Illinois to Sofia

Discover tips and strategies to find the most affordable flight options for your journey from Illinois (USIL) to Sofia (SOF). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated January 30, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$528
(oojo)

One-way from

$292
(Kiwi.com)

Popular in

June

Cheapest in

February

Average price

$674
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 ($336 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 January 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 January 30, 2025.

This oojo deal was found by Cheapflights users on 1/29. 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.
Wed 4/97:50 pmORD - SOF
1 stop34h 55mTurkish Airlines
Mon 4/219:15 amSOF - ORD
1 stop32h 35mTurkish Airlines
Deal found 1/29$530
This oojo deal was found by Cheapflights users on 1/29. 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.
Thu 2/209:55 pmORD - SOF
1 stop31h 55mLOT
Sat 3/12:35 pmSOF - ORD
1 stop13h 25mLOT
Deal found 1/29$541
This oojo deal was found by Cheapflights users on 1/29. 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 3/35:00 pmORD - SOF
1 stop16h 10mBritish Airways
Tue 3/186:05 pmSOF - ORD
2 stops28h 25mBritish Airways
Deal found 1/29$625
This Gotogate deal was found by Cheapflights users on 1/28. 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.
Wed 3/57:05 pmORD - SOF
1 stop12h 10mMultiple Airlines
Wed 3/196:00 amSOF - ORD
2 stops20h 55mMultiple Airlines
Deal found 1/28$626
This Priceline deal was found by Cheapflights users on 1/28. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/57:20 amORD - SOF
2 stops26h 50mAir Canada
Wed 3/196:00 amSOF - ORD
2 stops20h 55mAir Canada
Deal found 1/28$633
This CrystalTravel deal was found by Cheapflights users on 1/29. 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 CrystalTravel is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 1/309:25 pmORD - SOF
1 stop17h 20mLufthansa
Sun 2/26:10 amSOF - ORD
2 stops15h 15mLufthansa
Deal found 1/29$659
This United Airlines deal was found by Cheapflights users on 1/30. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 2/209:25 pmORD - SOF
1 stop17h 20mUnited Airlines
Thu 3/66:10 amSOF - ORD
2 stops16h 35mUnited Airlines
Deal found 1/30$663
This Austrian Airlines deal was found by Cheapflights users on 1/29. 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 Austrian Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 2/144:20 pmORD - SOF
1 stop15h 10mAustrian Airlines
Tue 2/186:45 pmSOF - ORD
1 stop27h 20mAustrian Airlines
Deal found 1/29$680
This Air France deal was found by Cheapflights users on 1/29. 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 France is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 2/51:26 pmMDW - SOF
2 stops16h 39mMultiple Airlines
Wed 2/197:00 amSOF - MDW
2 stops18h 43mMultiple Airlines
Deal found 1/29$686
This KLM deal was found by Cheapflights users on 1/29. 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 2/181:40 pmORD - SOF
2 stops16h 25mKLM
Fri 2/287:00 amSOF - ORD
2 stops18h 32mKLM
Deal found 1/29$692
This Air Serbia deal was found by Cheapflights users on 1/29. 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 Serbia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/116:50 pmORD - SOF
1 stop12h 45mAir Serbia
Sun 8/314:05 pmSOF - ORD
1 stop32h 35mAir Serbia
Deal found 1/29$713
This Gotogate deal was found by Cheapflights users on 1/30. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 2/163:50 pmSTL - SOF
2 stops37h 45mMultiple Airlines
Tue 3/42:15 pmSOF - STL
2 stops32h 51mMultiple Airlines
Deal found 1/30$732

Find flights from Illinois to Sofia within your budget

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 January 30, 2025.

Fly from

Any airport

Fly to

Any airport

Route

Depart

Return

Price

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

Wed 4/9

7:50 pm-2:45 pm

1 stop34h 55m

Sofia

Mon 4/21

9:15 am-9:50 am

1 stop32h 35m

$530

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

Thu 2/20

9:55 pm-1:50 pm

1 stop31h 55m

Sofia

Sat 3/1

2:35 pm-8:00 pm

1 stop13h 25m

$541

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

Mon 3/3

5:00 pm-5:10 pm

1 stop16h 10m

Sofia

Tue 3/18

6:05 pm-3:30 pm

2 stops28h 25m

$625

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

Wed 3/5

7:05 pm-3:15 pm

1 stop12h 10m

Sofia

Wed 3/19

6:00 am-7:55 pm

2 stops20h 55m

$626

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

Wed 3/5

7:20 am-5:50 pm

2 stops26h 30m

Sofia

Wed 3/19

6:00 am-7:57 am

2 stops32h 57m

$633

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

Thu 2/20

9:25 pm-10:45 pm

1 stop17h 20m

Sofia

Thu 3/6

6:10 am-2:45 pm

2 stops16h 35m

$663

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

Fri 2/28

10:35 pm-10:25 pm

1 stop15h 50m

Sofia

Mon 3/24

6:05 am-7:25 pm

1 stop20h 20m

$676

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

Fri 2/14

4:20 pm-3:30 pm

1 stop15h 10m

Sofia

Tue 2/18

6:45 pm-2:05 pm

1 stop27h 20m

$680

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

Tue 2/18

1:40 pm-2:05 pm

2 stops16h 25m

Sofia

Fri 2/28

7:00 am-5:32 pm

2 stops18h 32m

$692

St. LouisSofia

STL - SOF

STLSOF

Lambert-St Louis

Sun 2/16

3:50 pm-1:35 pm

2 stops37h 45m

Sofia

Tue 3/4

2:15 pm-3:06 pm

2 stops32h 51m

$732

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/29

Showing 1-10 of 30 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.

Travel insights for flights from Illinois to Sofia

Get recent, data-driven insights about flights from Illinois to Sofia including ideal travel times, pricing trends, and more.

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 January 30, 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 January 30, 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
1,335 reviews

Food

7.3

Crew

8.4

Entertainment

7.2

Comfort

7.7

Boarding

7.8

Overall

7.8

Reviews

1 / 20

8.0
Excellent

Anonymous,Dec 2024

YWG - YYZ

I could not select a seat prior to check in as systems not integrated. Different PNRs should be on reservation which would make process easier.

KLM
7.8
Good
1,335 reviews
KLM
7.8
Good
1,335 reviews

Food

7.3

Crew

8.4

Entertainment

7.2

Comfort

7.7

Boarding

7.8

Overall

7.8

Reviews

1 / 20

8.0
Excellent

Anonymous,Dec 2024

YWG - YYZ

I could not select a seat prior to check in as systems not integrated. Different PNRs should be on reservation which would make process easier.

LOT
7.6
Good
1,097 reviews
KLM
7.8
Good
1,335 reviews

Food

7.3

Crew

8.4

Entertainment

7.2

Comfort

7.7

Boarding

7.8

Overall

7.8

Reviews

1 / 20

8.0
Excellent

Anonymous,Dec 2024

YWG - YYZ

I could not select a seat prior to check in as systems not integrated. Different PNRs should be on reservation which would make process easier.

Austrian Airlines
7.5
Good
786 reviews
KLM
7.8
Good
1,335 reviews

Food

7.3

Crew

8.4

Entertainment

7.2

Comfort

7.7

Boarding

7.8

Overall

7.8

Reviews

1 / 20

8.0
Excellent

Anonymous,Dec 2024

YWG - YYZ

I could not select a seat prior to check in as systems not integrated. Different PNRs should be on reservation which would make process easier.

United Airlines
7.4
Good
8,906 reviews
KLM
7.8
Good
1,335 reviews

Food

7.3

Crew

8.4

Entertainment

7.2

Comfort

7.7

Boarding

7.8

Overall

7.8

Reviews

1 / 20

8.0
Excellent

Anonymous,Dec 2024

YWG - YYZ

I could not select a seat prior to check in as systems not integrated. Different PNRs should be on reservation which would make process easier.

Turkish Airlines
7.3
Good
3,903 reviews
KLM
7.8
Good
1,335 reviews

Food

7.3

Crew

8.4

Entertainment

7.2

Comfort

7.7

Boarding

7.8

Overall

7.8

Reviews

1 / 20

8.0
Excellent

Anonymous,Dec 2024

YWG - YYZ

I could not select a seat prior to check in as systems not integrated. Different PNRs should be on reservation which would make process easier.

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 ($387), TAP AIR PORTUGAL ($404), and Turkish Airlines ($471).

  • 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 January 30, 2025.
AirlineCheapestAverageFlexibilityOn-time
Turkish AirlinesCheapest$497Average$712FlexibilityNo cancel feeOn-time77%
British AirwaysCheapest$568Average$918FlexibilityNo cancel feeOn-time70%
KLMCheapest$569Average$738FlexibilityNo cancel feeOn-time75%
LOTCheapest$583Average$911FlexibilityNo cancel feeOn-time81%
Austrian AirlinesCheapest$591Average$938FlexibilityNo cancel feeOn-time78%
LufthansaCheapest$617Average$1,073FlexibilityNo cancel feeOn-time76%
United AirlinesCheapest$627Average$903FlexibilityNo cancel feeOn-time69%
ITA AirwaysCheapest$650Average$817FlexibilityNo cancel feeOn-time81%
Air CanadaCheapest$682Average$984FlexibilityNo cancel feeOn-time67%
SWISSCheapest$729Average$1,126FlexibilityNo cancel feeOn-time79%
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