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$223+ 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 10/8. Fares are subject to change and may not be available on all flights or dates of travel.
CHI — SOF
ago. 25 — sep. 11
lun. 8/25
lun. 9/1
1 adult, Economy
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Cheapflights Tip: The best prices from Chicago to Sofia are usually found in February or March, booked 48 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 agosto 20, 2025.

Round-trip from

$546
(FlightHub)

One-way from

$223
(Kiwi.com)

Popular in

June

Cheapest in

February

Average price

$716
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. 26% potential increase in price ($260 potential increase over avg. RT price).
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Cheapest flight prices on average. 5% potential price decrease ($37 potential savings vs. average RT price).
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Average for round-trip flights in August 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 agosto 20, 2025.

This FlightHub deal was found by Cheapflights users on 8/20. 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.
lun. 9/2911:25 amORD - SOF
1 stop13h 10mTurkish Airlines
mié. 10/83:35 pmSOF - ORD
1 stop14h 25mTurkish Airlines
Deal found 8/20$546
This FlightHub deal was found by Cheapflights users on 8/19. 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.
sáb. 10/411:45 pmORD - SOF
1 stop31h 00mTurkish Airlines
mar. 10/149:25 amSOF - ORD
1 stop32h 15mTurkish Airlines
Deal found 8/19$552
This FlightHub deal was found by Cheapflights users on 8/18. 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.
lun. 9/811:45 pmORD - SOF
1 stop24h 50mTurkish Airlines
lun. 10/139:25 amSOF - ORD
1 stop32h 15mTurkish Airlines
Deal found 8/18$555
This FlightHub deal was found by Cheapflights users on 8/20. 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.
sáb. 9/611:45 pmORD - SOF
1 stop31h 00mTurkish Airlines
sáb. 10/119:15 pmSOF - ORD
1 stop20h 25mTurkish Airlines
Deal found 8/20$556
This Kiwi.com deal was found by Cheapflights users on 8/18. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 9/311:45 pmORD - SOF
1 stop24h 50mTurkish Airlines
mié. 9/179:15 pmSOF - ORD
1 stop20h 25mTurkish Airlines
Deal found 8/18$560
This Kiwi.com deal was found by Cheapflights users on 8/19. 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.
lun. 10/611:45 pmORD - SOF
1 stop24h 50mTurkish Airlines
jue. 10/169:25 amSOF - ORD
1 stop16h 30mTurkish Airlines
Deal found 8/19$561
This CheapOair deal was found by Cheapflights users on 8/19. 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.
mar. 9/97:50 pmORD - SOF
1 stop28h 45mTurkish Airlines
mar. 9/239:25 amSOF - ORD
1 stop16h 30mTurkish Airlines
Deal found 8/19$562
This Turkish Airlines deal was found by Cheapflights users on 8/17. 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 Turkish Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 10/411:45 pmORD - SOF
1 stop24h 50mTurkish Airlines
mié. 10/153:35 pmSOF - ORD
1 stop26h 05mTurkish Airlines
Deal found 8/17$563
This FlightHub deal was found by Cheapflights users on 8/19. 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.
dom. 9/2811:25 amORD - SOF
1 stop19h 20mTurkish Airlines
jue. 10/99:25 amSOF - ORD
1 stop32h 15mTurkish Airlines
Deal found 8/19$565
This Ovago deal was found by Cheapflights users on 8/17. 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 Ovago is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
dom. 10/511:25 amORD - SOF
1 stop13h 10mTurkish Airlines
mar. 10/143:35 pmSOF - ORD
1 stop26h 05mTurkish Airlines
Deal found 8/17$566
This Turkish Airlines deal was found by Cheapflights users on 8/17. 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 Turkish Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 10/411:45 pmORD - SOF
1 stop24h 50mTurkish Airlines
vie. 10/103:35 pmSOF - ORD
1 stop26h 05mTurkish Airlines
Deal found 8/17$573
This FlightHub deal was found by Cheapflights users on 8/18. 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.
dom. 11/168:20 pmORD - SOF
1 stop16h 30mTurkish Airlines
dom. 11/3010:05 amSOF - ORD
1 stop32h 00mTurkish Airlines
Deal found 8/18$574

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 agosto 20, 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

lun. 9/29

11:25 am-2:45 pm

1 stop19h 20m

Sofia

mié. 10/8

9:15 pm-9:40 am

1 stop20h 25m

$546

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

sáb. 9/6

11:45 pm-2:45 pm

1 stop31h 00m

Sofia

jue. 10/9

9:25 am-9:40 am

1 stop32h 15m

$546

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

sáb. 10/4

11:45 pm-2:45 pm

1 stop31h 00m

Sofia

mar. 10/14

9:15 pm-9:40 am

1 stop20h 25m

$552

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

sáb. 9/13

11:45 pm-8:35 am

1 stop24h 50m

Sofia

sáb. 10/11

9:15 pm-9:40 am

1 stop20h 25m

$556

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

mié. 11/5

11:50 am-3:10 pm

1 stop19h 20m

Sofia

dom. 11/9

10:05 am-10:05 am

1 stop32h 00m

$556

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

dom. 9/28

7:50 pm-8:35 am

1 stop28h 45m

Sofia

mié. 10/8

9:15 pm-9:40 am

1 stop20h 25m

$556

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

sáb. 10/11

11:45 pm-2:45 pm

1 stop31h 00m

Sofia

sáb. 10/25

3:35 pm-7:25 pm

1 stop35h 50m

$556

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

lun. 10/6

11:45 pm-8:35 am

1 stop24h 50m

Sofia

jue. 10/16

9:25 am-5:55 pm

1 stop16h 30m

$561

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

mar. 9/9

7:50 pm-8:35 am

1 stop28h 45m

Sofia

mar. 9/23

9:25 am-5:55 pm

1 stop16h 30m

$562

ChicagoSofia

MDW - SOF

MDWSOF

Chicago Midway

vie. 12/5

2:00 pm-1:55 pm

2 stops15h 55m

Sofia

dom. 1/11

7:00 am-6:08 pm

2 stops19h 08m

$778

Flights are sorted by cheapest round-trip flights first.

Deals found on 8/20

Showing 1-10 of 38 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 August 8, 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 48 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 $1,185). 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 agosto 20, 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.

What’s the top layover airport for flights from Chicago to Sofia?

Share of 1-stop round-trip flights from Chicago to Sofia chosen by Cheapflights users in the past 12 months, using the same layover each way.

Warsaw (WAW) – chosen by Cheapflights users on 34% of 1-stop itineraries from Chicago to Sofia on Cheapflights.

What’s the cheapest layover airport for flights from Chicago to Sofia?

Average round-trip fare for 1-stop flights from Chicago to Sofia, chosen by Cheapflights users in the past 12 months, with the same layover each way.

Paris (CDG) is the most affordable 1-stop option, with an average round-trip price of $594.

What’s the fastest layover option from Chicago to Sofia?

Shortest average travel time for 1-stop one-way flights from Chicago to Sofia, based on itineraries clicked by Cheapflights users over the past 12 months, grouped by layover airport.

Flights via Vienna (VIE) have the shortest average one-way travel time for 1-stop routes: 11h 20m.

Which airport typically offers the quickest layover for flights from Chicago to Sofia?

Average layover duration for 1-stop one-way flights from Chicago to Sofia, chosen by Cheapflights users in the last 12 months, grouped by stopover airport.

Flights via Zurich (ZRH) offer the fastest connection on this route, with an average layover time of 0h 48m.

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 agosto 20, 2025.
Read reviews from past customers who have flown KLM, LOT, and United Airlines from Chicago to Sofia. 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
1,388 reviews

Comfort

7.7

Food

7.3

Crew

8.4

Overall

7.8

Entertainment

7.1

Boarding

7.8

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
1,388 reviews
KLM
7.8
Good
1,388 reviews

Comfort

7.7

Food

7.3

Crew

8.4

Overall

7.8

Entertainment

7.1

Boarding

7.8

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
1,110 reviews
KLM
7.8
Good
1,388 reviews

Comfort

7.7

Food

7.3

Crew

8.4

Overall

7.8

Entertainment

7.1

Boarding

7.8

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
8,928 reviews
KLM
7.8
Good
1,388 reviews

Comfort

7.7

Food

7.3

Crew

8.4

Overall

7.8

Entertainment

7.1

Boarding

7.8

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.
Turkish Airlines
7.3
Good
3,949 reviews
KLM
7.8
Good
1,388 reviews

Comfort

7.7

Food

7.3

Crew

8.4

Overall

7.8

Entertainment

7.1

Boarding

7.8

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.
Lufthansa
6.8
Okay
7,337 reviews
KLM
7.8
Good
1,388 reviews

Comfort

7.7

Food

7.3

Crew

8.4

Overall

7.8

Entertainment

7.1

Boarding

7.8

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.

  • How long is the flight from Chicago to Sofia?

    Departing from Chicago to Sofia will take you 16h 52m. The distance between Chicago and Sofia is about 5198 mi. Both multi-stop and nonstop flights can be found to your destination and back.

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

    According to our current data, Turkish Airlines ($495), Air France ($498), and KLM ($533) offers the cheapest pricing from Chicago to Sofia. Turkish Airlines is currently priced 32% below the average price you’ll pay for this route.

  • 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, Beyazit Meydani, and Sultan Ahmet Camii. Taksim Square, Beyazit Meydani, and Sultan Ahmet Camii can be visited by traveling about 20.8 mi, 21.7 mi, and 22.3 mi respectively from Istanbul. Those on a layover in Istanbul in need of a rental car can book one at Istanbul for about $51.

  • 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 Historical Museum of Warsaw. Warsaw Old Town, Natolin, and Historical Museum of Warsaw are located about 6.1 mi, 5.0 mi, and 6.1 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 $35.

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

    Chicago to Sofia flights have a layover in Frankfurt am Main least often. Frankfurt am Main is followed by Munich 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 $1,185). 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 agosto 20, 2025.
AirlineCheapestAverageFlexibilityOn-time
Turkish AirlinesCheapest$495Average$733FlexibilityNo cancel feeOn-time77%
Air FranceCheapest$498Average$624FlexibilityNo cancel feeOn-time77%
KLMCheapest$533Average$738FlexibilityNo cancel feeOn-time75%
LOTCheapest$570Average$878FlexibilityNo cancel feeOn-time81%
LufthansaCheapest$589Average$883FlexibilityNo cancel feeOn-time76%
SWISSCheapest$596Average$847FlexibilityNo cancel feeOn-time79%
United AirlinesCheapest$601Average$789FlexibilityNo cancel feeOn-time69%
Austrian AirlinesCheapest$613Average$1,010FlexibilityNo cancel feeOn-time78%
British AirwaysCheapest$644Average$796FlexibilityNo cancel feeOn-time70%
Air SerbiaCheapest$652Average$1,024FlexibilityNo cancel feeOn-timeN/A

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