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Sofia

$318+ 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 9/15. Fares are subject to change and may not be available on all flights or dates of travel.
CHI — SOF
Jul 11 — Jul 181
Sat 7/11
Sat 7/18
1 adult, Economy
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Cheap 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 11, 2026.

This oojo deal was found by Cheapflights users on 6/8. 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.
Sun 7/269:50 pm
ORD
-
SOF
1 stop12h 10m
LOT
Sun 10/186:45 pm
SOF
-
ORD
1 stop33h 05m
LOT
Deal found 6/8$881
This KAYAK deal was found by Cheapflights users on 6/10. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/29:40 pm
ORD
-
SOF
1 stop17h 35m
Lufthansa
Sun 8/167:25 pm
SOF
-
ORD
1 stop25h 10m
Lufthansa
Deal found 6/10$882
This Gotogate deal was found by Cheapflights users on 6/10. 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.
Thu 7/911:05 am
ORD
-
SOF
2 stops18h 15m
Multiple Airlines
Tue 8/187:25 pm
SOF
-
ORD
2 stops25h 30m
Multiple Airlines
Deal found 6/10$883
This United Airlines deal was found by Cheapflights users on 6/10. 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.
Mon 8/39:40 pm
ORD
-
SOF
1 stop17h 35m
United Airlines
Mon 8/176:10 am
SOF
-
ORD
2 stops16h 45m
United Airlines
Deal found 6/10$884
This United Airlines deal was found by Cheapflights users on 6/8. 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 8/29:40 pm
ORD
-
SOF
1 stop17h 35m
United Airlines
Mon 8/176:10 am
SOF
-
ORD
2 stops16h 45m
United Airlines
Deal found 6/8$885
This oojo deal was found by Cheapflights users on 6/8. 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 7/1510:30 pm
ORD
-
SOF
1 stop16h 20m
Lufthansa
Sat 8/227:25 pm
SOF
-
ORD
1 stop25h 10m
Lufthansa
Deal found 6/8$886
This United Airlines deal was found by Cheapflights users on 6/8. 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 8/19:40 pm
ORD
-
SOF
1 stop13h 00m
United Airlines
Wed 9/96:10 am
SOF
-
ORD
1 stop14h 25m
United Airlines
Deal found 6/8$887
This oojo deal was found by Cheapflights users on 6/11. 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 7/139:40 pm
ORD
-
SOF
1 stop17h 35m
Lufthansa
Mon 8/177:00 pm
SOF
-
ORD
1 stop25h 55m
Lufthansa
Deal found 6/11$888
This CheapOair deal was found by Cheapflights users on 6/10. 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.
Fri 7/319:40 pm
ORD
-
SOF
1 stop17h 35m
Multiple Airlines
Tue 9/86:10 am
SOF
-
ORD
2 stops22h 02m
Multiple Airlines
Deal found 6/10$889
This KAYAK deal was found by Cheapflights users on 6/8. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/2811:07 am
ORD
-
SOF
2 stops28h 48m
Austrian Airlines
Fri 9/118:00 am
SOF
-
ORD
2 stops17h 00m
Austrian Airlines
Deal found 6/8$890
This oojo deal was found by Cheapflights users on 6/10. 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.
Tue 7/219:40 pm
ORD
-
SOF
1 stop17h 35m
Lufthansa
Thu 8/136:45 pm
SOF
-
ORD
1 stop26h 10m
Lufthansa
Deal found 6/10$891
This United Airlines deal was found by Cheapflights users on 6/8. 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 7/263:35 pm
ORD
-
SOF
1 stop12h 35m
United Airlines
Fri 9/116:20 am
SOF
-
ORD
1 stop14h 35m
United Airlines
Deal found 6/8$892

Find 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 11, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$881
(oojo)

One-way from

$318
(Kiwi.com)

Popular in

June

Cheapest in

February

Average price

$1,122
Provider with most accurate pricing for Chicago (CHI)-Sofia flight deals.
Search Deals
Provider most trusted by Cheapflights users for Chicago (CHI)-Sofia flights.
Search Deals
From Chicago (CHI) to Sofia
Search Deals
One-way flight from Chicago (CHI) to Sofia
Search Deals
Highest demand for flights based on searches. 25% potential increase in price ($260 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease ($34 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in June 2026
Search Deals

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 11, 2026.
Use the filters below to find and compare flights from Chicago to Sofia that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

Fri 10/9

12:55 pm-12:10 pm

2 stops15h 15m

Sofia

Tue 10/27

2:05 pm-9:05 pm

1 stop14h 00m

$890

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

Fri 7/31

12:27 pm-2:00 pm

2 stops17h 33m

Sofia

Tue 9/8

7:00 am-4:45 pm

2 stops17h 45m

$902

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

Sat 8/22

8:40 pm-12:10 pm

2 stops31h 30m

Sofia

Sun 8/30

6:20 am-2:00 pm

2 stops15h 40m

$903

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

Sat 8/1

9:40 pm-11:15 pm

1 stop17h 35m

Sofia

Mon 8/31

6:55 pm-4:59 pm

2 stops30h 04m

$904
Quickest round-trip

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

Thu 7/30

3:35 pm-12:10 pm

1 stop12h 35m

Sofia

Mon 8/17

6:10 am-12:35 pm

1 stop14h 25m

$912

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

Fri 8/7

1:59 pm-2:00 pm

2 stops16h 01m

Sofia

Sun 9/6

7:00 am-2:15 pm

1 stop15h 15m

$917

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

Wed 7/22

3:53 pm-11:15 pm

2 stops23h 22m

Sofia

Mon 9/21

2:20 pm-12:55 pm

1 stop30h 35m

$917

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

Sat 7/18

3:53 pm-6:40 pm

2 stops18h 47m

Sofia

Thu 8/27

6:30 am-2:55 pm

1 stop16h 25m

$922

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

Mon 10/5

8:25 pm-8:30 pm

2 stops40h 05m

Sofia

Mon 10/19

8:10 pm-7:45 pm

2 stops31h 35m

$923

ChicagoSofia

MDW - SOF

MDWSOF

Chicago Midway

Sun 8/2

1:18 pm-2:00 pm

2 stops16h 42m

Sofia

Tue 9/1

7:00 am-6:01 pm

2 stops19h 01m

$930

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/7

Showing 1-10 of 43 resultsSorted by cheapest first
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Compare providers for flights from Chicago to Sofia

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Chicago to Sofia in June.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars
OvagoPrice Accuracy3 starsTrust Score*3 stars
AranGrantPrice Accuracy3 starsTrust Score*3 stars
oojoPrice Accuracy3 starsTrust Score*2 stars
Justfly.comPrice Accuracy3 starsTrust Score*3 stars
JustAirTicketPrice Accuracy-Trust Score*1 star

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on Chicago-Sofia flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Chicago-Sofia flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Chicago-Sofia flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Chicago-Sofia flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Chicago-Sofia flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

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

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

Currently, October is the cheapest month in which you can book a flight from Chicago to Sofia (average of $385). Flying from Chicago to Sofia in June is currently the most expensive (average of $1,138). 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.

How much does it cost to fly round-trip from Chicago to Sofia?

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.

Frankfurt am Main (FRA) – chosen by Cheapflights users on 35% 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.

Warsaw (WAW) is the most affordable 1-stop option, with an average round-trip price of $478.

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 Warsaw (WAW) have the shortest average one-way travel time for 1-stop routes: 11h 55m.

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.

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

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 41 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.

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 11, 2026.
Read reviews from past customers who have flown LOT,SWISS, andTurkish 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.
LOT
7.5
Good
1,198 reviews

Crew

8.2

Entertainment

6.9

Overall

7.5

Food

7.2

Boarding

7.5

Comfort

7.4

Reviews

1 / 20
8.0
Excellent

Anonymous,Apr 2026

NQZ - WAW

Everything is ok , but I paid for seats that was given to someone . And when she was given tickets during registration, the customer service representative didn’t even see anything that the seats were exactly 16 D for both flight . But he gave tickets with totally different seats. How can they don’t see it on the site when he is registering someone . I don’t know what to say .
LOT
7.5
Good
1,198 reviews
LOT
7.5
Good
1,198 reviews

Crew

8.2

Entertainment

6.9

Overall

7.5

Food

7.2

Boarding

7.5

Comfort

7.4

Reviews

1 / 20
8.0
Excellent

Anonymous,Apr 2026

NQZ - WAW

Everything is ok , but I paid for seats that was given to someone . And when she was given tickets during registration, the customer service representative didn’t even see anything that the seats were exactly 16 D for both flight . But he gave tickets with totally different seats. How can they don’t see it on the site when he is registering someone . I don’t know what to say .
SWISS
7.5
Good
1,969 reviews
LOT
7.5
Good
1,198 reviews

Crew

8.2

Entertainment

6.9

Overall

7.5

Food

7.2

Boarding

7.5

Comfort

7.4

Reviews

1 / 20
8.0
Excellent

Anonymous,Apr 2026

NQZ - WAW

Everything is ok , but I paid for seats that was given to someone . And when she was given tickets during registration, the customer service representative didn’t even see anything that the seats were exactly 16 D for both flight . But he gave tickets with totally different seats. How can they don’t see it on the site when he is registering someone . I don’t know what to say .
Turkish Airlines
7.4
Good
4,409 reviews
LOT
7.5
Good
1,198 reviews

Crew

8.2

Entertainment

6.9

Overall

7.5

Food

7.2

Boarding

7.5

Comfort

7.4

Reviews

1 / 20
8.0
Excellent

Anonymous,Apr 2026

NQZ - WAW

Everything is ok , but I paid for seats that was given to someone . And when she was given tickets during registration, the customer service representative didn’t even see anything that the seats were exactly 16 D for both flight . But he gave tickets with totally different seats. How can they don’t see it on the site when he is registering someone . I don’t know what to say .
United Airlines
7.4
Good
9,804 reviews
LOT
7.5
Good
1,198 reviews

Crew

8.2

Entertainment

6.9

Overall

7.5

Food

7.2

Boarding

7.5

Comfort

7.4

Reviews

1 / 20
8.0
Excellent

Anonymous,Apr 2026

NQZ - WAW

Everything is ok , but I paid for seats that was given to someone . And when she was given tickets during registration, the customer service representative didn’t even see anything that the seats were exactly 16 D for both flight . But he gave tickets with totally different seats. How can they don’t see it on the site when he is registering someone . I don’t know what to say .
Lufthansa
6.8
Okay
8,055 reviews
LOT
7.5
Good
1,198 reviews

Crew

8.2

Entertainment

6.9

Overall

7.5

Food

7.2

Boarding

7.5

Comfort

7.4

Reviews

1 / 20
8.0
Excellent

Anonymous,Apr 2026

NQZ - WAW

Everything is ok , but I paid for seats that was given to someone . And when she was given tickets during registration, the customer service representative didn’t even see anything that the seats were exactly 16 D for both flight . But he gave tickets with totally different seats. How can they don’t see it on the site when he is registering someone . I don’t know what to say .

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 12 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 15h 15m. The distance between Chicago and Sofia is about 5194 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, ITA Airways ($508), Turkish Airlines ($523), and KLM ($533) offers the cheapest pricing from Chicago to Sofia. ITA Airways is currently priced 32% 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 Turkish Airlines, with whom users have recently found tickets for as low as $295. However, be on the lookout for offers from United Airlines and Air Serbia, 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. Munich 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, Laleli Camii, and Sultan Ahmet Camii. Taksim Square, Laleli Camii, and Sultan Ahmet Camii can be visited by traveling about 20.8 mi, 21.5 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 $47.

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

    Most Munich visitors opt to spend their time at Theresienwiese, Marienplatz, and Altes Rathaus. Theresienwiese, Marienplatz, and Altes Rathaus are located about 18.8 mi, 17.8 mi, and 17.8 mi, respectively from Munich Franz Josef Strauss. Those on a layover in Munich in need of a rental car can book one at Munich Franz Josef Strauss for about $47.

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

    Chicago to Sofia flights have a layover in Warsaw least often.

  • 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, October is the cheapest month in which you can book a flight from Chicago to Sofia (average of $385). Flying from Chicago to Sofia in June is currently the most expensive (average of $1,138). 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

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 11, 2026.
AirlineCheapestAverageFlexibilityOn-time
ITA AirwaysCheapest$508Average$1,161FlexibilityNo cancel feeOn-time81%
Turkish AirlinesCheapest$523Average$715FlexibilityNo cancel feeOn-time77%
KLMCheapest$533Average$732FlexibilityNo cancel feeOn-time75%
United AirlinesCheapest$561Average$919FlexibilityNo cancel feeOn-time69%
SWISSCheapest$565Average$824FlexibilityNo cancel feeOn-time79%
Austrian AirlinesCheapest$575Average$884FlexibilityNo cancel feeOn-time78%
LOTCheapest$578Average$836FlexibilityNo cancel feeOn-time81%
LufthansaCheapest$578Average$884FlexibilityNo cancel feeOn-time76%
Air FranceCheapest$585Average$866FlexibilityNo cancel feeOn-time77%
British AirwaysCheapest$609Average$644FlexibilityNo cancel feeOn-time70%

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