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$267+ Cheap flights from Chicago (CHI) 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 7/21. Fares are subject to change and may not be available on all flights or dates of travel.
CHI — SOF
Jun 23 — Jun 301
Mon 6/23
Mon 6/30
1 adult, Economy
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Cheapflights Tip: The best prices from Chicago to Sofia are usually found in February or March, booked 59 days in advance, depart on a Thursday or Sunday and return on a Thursday

Cheap flight deals from Chicago to Sofia

Discover tips and strategies to find the most affordable flight options for your journey from Chicago (CHI) 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 June 18, 2025.

Round-trip from

$652
(Cheapflightsfares)

One-way from

$267
(Kiwi.com)

Popular in

June

Cheapest in

February

Average price

$1,169
From Chicago (CHI) to Sofia
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One-way flight from Chicago (CHI) to Sofia
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Highest demand for flights based on searches. 27% potential increase in price ($293 potential increase over avg. RT price).
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Cheapest flight prices on average. 5% potential price decrease ($38 potential savings vs. average RT price).
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Average for round-trip flights in June 2025
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Find flight deals from Chicago to Sofia

Cheapest flights from Chicago to Sofia
Explore the most affordable flight options available from Chicago to Sofia. Find the lowest fares from popular airlines and budget airlines, with prices last updated on June 18, 2025.

This Cheapflightsfares deal was found by Cheapflights users on 6/18. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 7/1410:30 pmORD - SOF
2 stops16h 30mLufthansa
Tue 9/26:35 pmSOF - ORD
2 stops25h 55mLufthansa
Deal found 6/18$652
This Justfly.com deal was found by Cheapflights users on 6/18. 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 Justfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/3110:30 pmORD - SOF
2 stops16h 30mMultiple Airlines
Sat 10/46:15 amSOF - ORD
2 stops21h 56mMultiple Airlines
Deal found 6/18$656
This Austrian Airlines deal was found by Cheapflights users on 6/17. 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 Austrian Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/84:20 pmORD - SOF
1 stop17h 50mAustrian Airlines
Sun 9/712:25 pmSOF - ORD
2 stops38h 00mAustrian Airlines
Deal found 6/17$657
This Air Canada deal was found by Cheapflights users on 6/17. 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.
Sat 7/129:14 pmORD - SOF
2 stops54h 46mAir Canada
Thu 10/26:15 amSOF - ORD
2 stops16h 40mAir Canada
Deal found 6/17$658
This SWISS deal was found by Cheapflights users on 6/16. 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 SWISS is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/107:05 pmORD - SOF
2 stops32h 55mSWISS
Sun 9/712:45 pmSOF - ORD
2 stops35h 10mSWISS
Deal found 6/16$660
This Air France deal was found by Cheapflights users on 6/18. 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 8/1111:15 amORD - SOF
2 stops18h 45mAir France
Mon 9/87:00 amSOF - ORD
2 stops18h 37mAir France
Deal found 6/18$665
This Air Serbia deal was found by Cheapflights users on 6/16. 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.
Mon 8/46:50 pmORD - SOF
1 stop12h 45mAir Serbia
Wed 3/114:00 pmSOF - ORD
1 stop13h 10mAir Serbia
Deal found 6/16$666
This United Airlines deal was found by Cheapflights users on 6/17. 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.
Sun 7/279:55 amORD - SOF
2 stops29h 05mUnited Airlines
Wed 8/136:15 amSOF - ORD
2 stops24h 24mUnited Airlines
Deal found 6/17$668
This FlightHub deal was found by Cheapflights users on 6/18. 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.
Sat 7/53:00 pmORD - SOF
1 stop18h 10mITA Airways
Sun 8/176:00 pmSOF - ORD
1 stop27h 10mITA Airways
Deal found 6/18$669
This British Airways deal was found by Cheapflights users on 6/16. 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 British Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/37:15 pmORD - SOF
1 stop15h 55mBritish Airways
Wed 3/119:00 pmSOF - ORD
1 stop29h 45mBritish Airways
Deal found 6/16$673
This KLM deal was found by Cheapflights users on 6/16. 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 KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 7/212:00 pmORD - SOF
2 stops16h 00mKLM
Mon 3/97:00 amSOF - ORD
2 stops17h 50mKLM
Deal found 6/16$678
This KLM deal was found by Cheapflights users on 6/16. 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 KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/61:43 pmMDW - SOF
2 stops16h 17mKLM
Tue 11/187:00 amSOF - MDW
2 stops19h 07mKLM
Deal found 6/16$678

Cheapflights Fare Finder

Customize your flight search to find flights from Chicago 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 June 18, 2025.
Use the filters below to find and compare flights from Chicago to Sofia that are best for you.

Fly from

Chicago

Fly to

Sofia

Route

Depart

Return

Price

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

Mon 7/14

10:30 pm-11:00 pm

2 stops16h 30m

Sofia

Tue 9/2

6:35 pm-12:30 pm

2 stops25h 55m

$652

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

Thu 7/31

10:30 pm-11:00 pm

2 stops16h 30m

Sofia

Sat 10/4

6:15 am-8:11 pm

2 stops21h 56m

$656

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

Fri 8/8

4:20 pm-6:10 pm

1 stop17h 50m

Sofia

Sun 9/7

4:05 pm-6:25 pm

2 stops34h 20m

$657

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

Sat 7/12

9:14 pm-12:00 pm

2 stops54h 46m

Sofia

Thu 10/2

6:15 am-2:55 pm

2 stops16h 40m

$658

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

Sun 8/10

7:05 pm-12:00 pm

2 stops32h 55m

Sofia

Sun 9/7

12:45 pm-3:55 pm

2 stops35h 10m

$660

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

Mon 8/11

11:15 am-2:00 pm

2 stops18h 45m

Sofia

Mon 9/8

7:00 am-5:37 pm

2 stops18h 37m

$665

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

Mon 8/4

6:50 pm-3:35 pm

1 stop12h 45m

Sofia

Wed 3/11

4:00 pm-10:10 pm

1 stop13h 10m

$666

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

Sun 7/27

9:55 am-11:00 pm

2 stops29h 05m

Sofia

Wed 8/13

6:15 am-10:39 pm

2 stops24h 24m

$668

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

Sat 7/5

3:00 pm-5:10 pm

1 stop18h 10m

Sofia

Sun 8/17

6:00 pm-1:10 pm

1 stop27h 10m

$669

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

Sun 8/3

7:15 pm-7:10 pm

1 stop15h 55m

Sofia

Mon 3/9

5:25 pm-2:55 pm

1 stop28h 30m

$673

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/17

Showing 1-10 of 26 results
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Best time to book a flight from Chicago to Sofia

Have a flexible travel schedule? Discover the best time to fly to Sofia from Chicago 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 Chicago to Sofia

How far ahead should I book a flight from Chicago to Sofia?

Use this chart to determine the optimal time to book a round-trip flight from Chicago to Sofia. Price data was last updated on June 13, 2025.

The price you pay for your flight from Chicago to Sofia may vary depending on when you book. For the best chance of a lower fare, look to book 59 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.

What is the cheapest month to book a flight from Chicago to Sofia?

Currently, November is the cheapest month in which you can book a flight from Chicago to Sofia (average of $632). Flying from Chicago to Sofia in June is currently the most expensive (average of $1,201). 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 CHI to SOF?

Find hourly flight availability from Chicago 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 June 18, 2025.

It’s optimal to fly from Chicago to Sofia in the morning. By choosing this option you can save up to 31% on the cost of your flight, compared to a flight at noon.

What is the cheapest day to fly from Chicago to Sofia?

Use this chart to determine the cheapest time to fly round-trip from Chicago to Sofia. Price data was last updated on December 16, 2024.

Travelers seeking maximum savings on their Chicago to Sofia flight should consider departing on Sunday mornings when fares are most often at their lowest. Saturday at noon flights should be avoided if possible as fares are typically the most expensive at this time.

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 June 18, 2025.
Peruse reviews from past customers who have flown with KLM, Austrian Airlines and Air France from Chicago to Sofia to help guide your decision. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
KLM
7.8
Good
1,364 reviews

Boarding

7.8

Entertainment

7.1

Food

7.2

Overall

7.8

Comfort

7.7

Crew

8.4

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
1,364 reviews
KLM
7.8
Good
1,364 reviews

Boarding

7.8

Entertainment

7.1

Food

7.2

Overall

7.8

Comfort

7.7

Crew

8.4

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.
Austrian Airlines
7.6
Good
804 reviews
KLM
7.8
Good
1,364 reviews

Boarding

7.8

Entertainment

7.1

Food

7.2

Overall

7.8

Comfort

7.7

Crew

8.4

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
1,467 reviews
KLM
7.8
Good
1,364 reviews

Boarding

7.8

Entertainment

7.1

Food

7.2

Overall

7.8

Comfort

7.7

Crew

8.4

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.
SWISS
7.5
Good
1,632 reviews
KLM
7.8
Good
1,364 reviews

Boarding

7.8

Entertainment

7.1

Food

7.2

Overall

7.8

Comfort

7.7

Crew

8.4

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
8,810 reviews
KLM
7.8
Good
1,364 reviews

Boarding

7.8

Entertainment

7.1

Food

7.2

Overall

7.8

Comfort

7.7

Crew

8.4

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 Chicago 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 Chicago?

    Sofia (SOF) is the airport you will fly into if you book a flight from Chicago to Sofia. You should not have trouble finding flights to Sofia from Chicago; the airport handles an average of 0 inbound flights from Chicago per day. You should also have plenty of airline options to choose from since 10 airlines have flights to the Sofia airport from Chicago. It is only a 4.2 mi journey from Sofia (SOF) to Sofia’s city center.

  • What are the cheapest airlines flying from Chicago to Sofia round-trip?

    According to our current data, Lufthansa ($652), Austrian Airlines ($657), and Air Canada ($658) offers the cheapest pricing from Chicago to Sofia. Lufthansa is currently priced 13% below the average price you’ll pay for this route.

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

    The cheapest airline one-way is British Airways, with whom users have recently found tickets for as low as $326. However, be on the lookout for offers from ITA Airways and SWISS, as they are both options that can get you from Chicago to Sofia for a low price.

  • Where are the most common layover locations when flying from Chicago to Sofia?

    Chicago to Sofia flights have a layover in Istanbul most often. Warsaw sees the next most layovers on Chicago to Sofia flights.

  • What are some popular things to do or see while on a layover in Istanbul?

    The majority of Istanbul visitors spend their time at Taksim Square, Sultan Ahmet Camii, and Beyazit Meydani. Taksim Square, Sultan Ahmet Camii, and Beyazit Meydani can be visited by traveling about 20.8 mi, 22.3 mi, and 21.7 mi respectively from Istanbul. Those on a layover in Istanbul in need of a rental car can book one at Istanbul for about $42.

  • What are some popular points of interest to see during a layover in Warsaw?

    Most Warsaw visitors opt to spend their time at Warsaw Old Town, Natolin, and Pałac Kultury i Nauki. Warsaw Old Town, Natolin, and Pałac Kultury i Nauki are located about 6.1 mi, 5.0 mi, and 4.8 mi, respectively from Warsaw Frederic Chopin. Those on a layover in Warsaw in need of a rental car can book one at Warsaw Frederic Chopin for about $29.

  • Where are the least popular layover locations for Chicago to Sofia flights?

    Chicago to Sofia flights have a layover in Munich least often. Munich is followed by Frankfurt am Main in terms of the least popular layover location on flights from Chicago to Sofia.

  • Can I find deals for flights from Chicago to Sofia that include hotel bookings?

    Yes. In addition to deals on Chicago to Sofia flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Chicago to Sofia?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Chicago to Sofia.

  • Can I find deals for business class flights from Chicago to Sofia?

    Yes. Cheapflights offers flight deals from Chicago 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 Chicago to Sofia?

    Currently, November is the cheapest month in which you can book a flight from Chicago to Sofia (average of $632). Flying from Chicago to Sofia in June is currently the most expensive (average of $1,201). 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 Chicago to Sofia

See prices for flight routes from nearby airports that may be better suited for you.
O'Hare Intl to Sofia flights
Midway to Sofia flights
St. Louis to Sofia flights

Top 10 airlines flying from Chicago to Sofia

Discover the top 10 airlines that operate flights from Chicago 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 June 18, 2025.
AirlineCheapestAverageFlexibilityOn-time
Turkish AirlinesCheapest$493Average$792FlexibilityNo cancel feeOn-time77%
Air FranceCheapest$498Average$604FlexibilityNo cancel feeOn-time77%
LOTCheapest$573Average$880FlexibilityNo cancel feeOn-time81%
KLMCheapest$578Average$739FlexibilityNo cancel feeOn-time75%
SWISSCheapest$596Average$920FlexibilityNo cancel feeOn-time79%
Austrian AirlinesCheapest$609Average$875FlexibilityNo cancel feeOn-time78%
British AirwaysCheapest$613Average$778FlexibilityNo cancel feeOn-time70%
LufthansaCheapest$614Average$956FlexibilityNo cancel feeOn-time76%
United AirlinesCheapest$617Average$812FlexibilityNo cancel feeOn-time69%
Air SerbiaCheapest$652Average$1,021FlexibilityNo cancel feeOn-timeN/A

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