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$311+ 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 12/12. Fares are subject to change and may not be available on all flights or dates of travel.
CHI — SOF
Nov 6 — Nov 131
Thu 11/6
Thu 11/13
1 adult, Economy
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Find cheap flights from Chicago to Sofia with Cheapflights

1. Tell us where you want to go

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Cheapflights Tip: The best prices from Chicago to Sofia are usually found in February or March, booked 42 days in advance, depart on a Thursday or Sunday and return on a Thursday

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 October 7, 2025.

This Air France deal was found by Cheapflights users on 10/7. 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.
Thu 11/65:20 pmORD - SOF
1 stop12h 35mMultiple Airlines
Thu 11/137:00 amSOF - ORD
2 stops18h 53mMultiple Airlines
Deal found 10/7$540
This KLM deal was found by Cheapflights users on 10/7. 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.
Thu 11/61:25 pmORD - SOF
2 stops16h 30mMultiple Airlines
Mon 11/247:00 amSOF - ORD
2 stops18h 53mMultiple Airlines
Deal found 10/7$544
This Kiwi.com deal was found by Cheapflights users on 10/7. 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.
Mon 11/310:35 pmORD - SOF
1 stop16h 10mLufthansa
Tue 11/256:00 amSOF - ORD
1 stop15h 10mLufthansa
Deal found 10/7$546
This Kiwi.com deal was found by Cheapflights users on 10/7. 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.
Thu 11/68:20 pmORD - SOF
1 stop28h 25mTurkish Airlines
Thu 11/209:40 pmSOF - ORD
1 stop28h 45mTurkish Airlines
Deal found 10/7$549
This FlightHub deal was found by Cheapflights users on 10/6. 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.
Wed 11/511:50 amORD - SOF
1 stop19h 20mTurkish Airlines
Sat 11/229:40 pmSOF - ORD
1 stop28h 45mTurkish Airlines
Deal found 10/6$550
This Kiwi.com deal was found by Cheapflights users on 10/6. 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.
Mon 10/209:40 pmORD - SOF
1 stop17h 20mLufthansa
Tue 11/46:00 amSOF - ORD
1 stop15h 10mLufthansa
Deal found 10/6$556
This Mytrip deal was found by Cheapflights users on 10/5. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/193:55 pmORD - SOF
2 stops15h 20mMultiple Airlines
Wed 11/266:10 amSOF - ORD
2 stops21h 50mMultiple Airlines
Deal found 10/5$558
This Air France deal was found by Cheapflights users on 10/6. 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.
Thu 11/131:25 pmORD - SOF
2 stops16h 30mMultiple Airlines
Fri 3/67:00 amSOF - ORD
1 stop15h 20mMultiple Airlines
Deal found 10/6$559
This Kiwi.com deal was found by Cheapflights users on 10/6. 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.
Wed 10/223:35 pmORD - SOF
1 stop12h 25mLufthansa
Tue 11/46:00 amSOF - ORD
1 stop15h 10mLufthansa
Deal found 10/6$561
This KAYAK deal was found by Cheapflights users on 10/7. 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.
Wed 11/56:50 pmORD - SOF
1 stop12h 25mSWISS
Thu 11/204:00 pmSOF - ORD
1 stop32h 20mSWISS
Deal found 10/7$564
This Air France deal was found by Cheapflights users on 10/6. 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.
Sun 11/165:20 pmORD - SOF
1 stop12h 35mMultiple Airlines
Fri 3/67:00 amSOF - ORD
2 stops17h 37mMultiple Airlines
Deal found 10/6$565
This KLM deal was found by Cheapflights users on 10/5. 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.
Wed 11/191:47 pmMDW - SOF
2 stops16h 18mKLM
Wed 11/267:00 amSOF - MDW
2 stops19h 08mKLM
Deal found 10/5$708

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 October 7, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$540
(Air France)

One-way from

$311
(Kiwi.com)

Popular in

June

Cheapest in

February

Average price

$644
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. 26% potential increase in price ($264 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 5% potential price decrease ($38 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in October 2025
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 October 7, 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

Wed 11/19

4:20 pm-11:50 am

1 stop11h 30m

Sofia

Wed 11/26

6:10 am-2:55 pm

2 stops16h 45m

$577

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

Wed 11/5

9:50 pm-6:20 pm

1 stop12h 30m

Sofia

Thu 11/20

6:00 am-2:55 pm

2 stops16h 55m

$578

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

Tue 11/11

6:00 pm-6:20 pm

1 stop16h 20m

Sofia

Tue 12/2

6:00 am-6:45 pm

2 stops20h 45m

$578

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

Sun 11/16

9:50 pm-10:45 pm

1 stop16h 55m

Sofia

Wed 11/26

6:10 am-8:05 pm

1 stop21h 55m

$578

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

Wed 11/12

9:50 pm-6:20 pm

1 stop12h 30m

Sofia

Tue 12/2

6:00 am-1:10 pm

1 stop15h 10m

$578

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

Tue 11/11

6:00 pm-1:15 pm

1 stop11h 15m

Sofia

Wed 11/26

6:10 am-2:55 pm

2 stops16h 45m

$578

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

Mon 11/10

9:50 pm-10:45 pm

1 stop16h 55m

Sofia

Tue 12/2

6:00 am-1:10 pm

1 stop15h 10m

$578

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

Wed 11/12

9:50 pm-6:20 pm

1 stop12h 30m

Sofia

Wed 11/26

6:10 am-3:20 pm

1 stop17h 10m

$578

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

Wed 11/5

9:50 pm-6:20 pm

1 stop12h 30m

Sofia

Tue 11/25

6:00 am-6:45 pm

2 stops20h 45m

$578

ChicagoSofia

MDW - SOF

MDWSOF

Chicago Midway

Wed 11/19

1:47 pm-2:05 pm

2 stops16h 18m

Sofia

Wed 11/26

7:00 am-6:08 pm

2 stops19h 08m

$708

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/6

Showing 1-10 of 32 results
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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 October.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy2 starsTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars
eDreamsPrice Accuracy3 starsTrust Score*3 stars
AranGrantPrice Accuracy3 starsTrust Score*3 stars
CheapflightsfaresPrice Accuracy3 starsTrust Score*1 star
oojoPrice Accuracy3 starsTrust Score*3 stars
GotogatePrice Accuracy2 starsTrust Score*2 stars
JustAirTicketPrice Accuracy-Trust Score*3 stars

*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

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 October 3, 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 42 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 $489). Flying from Chicago to Sofia in June is currently the most expensive (average of $826). 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 October 7, 2025.

It’s optimal to fly from Chicago to Sofia in the evening. By choosing this option you can save up to 26% 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 Tuesday mornings when fares are most often at their lowest. Sunday at noon flights should be avoided if possible as fares are typically the most expensive at this time.

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.

Warsaw (WAW) – chosen by Cheapflights users on 31% 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 October 7, 2025.
Read reviews from past customers who have flown LOT, SWISS, 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.
LOT
7.6
Good
1,125 reviews

Comfort

7.5

Crew

8.2

Entertainment

6.9

Boarding

7.6

Overall

7.6

Food

7.1

Reviews

1 / 20
10.0
Excellent

Rami,Sep 2025

LAX - WAW

The second leg. Very tight seats No WiFi on both flights
LOT
7.6
Good
1,125 reviews
LOT
7.6
Good
1,125 reviews

Comfort

7.5

Crew

8.2

Entertainment

6.9

Boarding

7.6

Overall

7.6

Food

7.1

Reviews

1 / 20
10.0
Excellent

Rami,Sep 2025

LAX - WAW

The second leg. Very tight seats No WiFi on both flights
SWISS
7.5
Good
1,759 reviews
LOT
7.6
Good
1,125 reviews

Comfort

7.5

Crew

8.2

Entertainment

6.9

Boarding

7.6

Overall

7.6

Food

7.1

Reviews

1 / 20
10.0
Excellent

Rami,Sep 2025

LAX - WAW

The second leg. Very tight seats No WiFi on both flights
United Airlines
7.4
Good
8,957 reviews
LOT
7.6
Good
1,125 reviews

Comfort

7.5

Crew

8.2

Entertainment

6.9

Boarding

7.6

Overall

7.6

Food

7.1

Reviews

1 / 20
10.0
Excellent

Rami,Sep 2025

LAX - WAW

The second leg. Very tight seats No WiFi on both flights
Turkish Airlines
7.3
Good
3,993 reviews
LOT
7.6
Good
1,125 reviews

Comfort

7.5

Crew

8.2

Entertainment

6.9

Boarding

7.6

Overall

7.6

Food

7.1

Reviews

1 / 20
10.0
Excellent

Rami,Sep 2025

LAX - WAW

The second leg. Very tight seats No WiFi on both flights
Lufthansa
6.8
Okay
7,457 reviews
LOT
7.6
Good
1,125 reviews

Comfort

7.5

Crew

8.2

Entertainment

6.9

Boarding

7.6

Overall

7.6

Food

7.1

Reviews

1 / 20
10.0
Excellent

Rami,Sep 2025

LAX - WAW

The second leg. Very tight seats No WiFi on both flights

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 12h 30m. 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, Turkish Airlines ($510), KLM ($533), and LOT ($582) offers the cheapest pricing from Chicago to Sofia. Turkish Airlines is currently priced 30% 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. Frankfurt am Main 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 Laleli Camii. Taksim Square, Beyazit Meydani, and Laleli Camii can be visited by traveling about 20.8 mi, 21.7 mi, and 21.5 mi respectively from Istanbul. Those on a layover in Istanbul in need of a rental car can book one at Istanbul for about $40.

  • What are some popular points of interest to see during a layover in Frankfurt am Main?

    Most Frankfurt am Main visitors opt to spend their time at Römerberg, Hauptwache, and Festhalle. Römerberg, Hauptwache, and Festhalle are located about 7.4 mi, 7.4 mi, and 6.5 mi, respectively from Frankfurt am Main. Those on a layover in Frankfurt am Main in need of a rental car can book one at Frankfurt am Main for about $42.

  • 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 $489). Flying from Chicago to Sofia in June is currently the most expensive (average of $826). 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 October 7, 2025.
AirlineCheapestAverageFlexibilityOn-time
Turkish AirlinesCheapest$510Average$753FlexibilityNo cancel feeOn-time77%
KLMCheapest$533Average$723FlexibilityNo cancel feeOn-time75%
LOTCheapest$582Average$967FlexibilityNo cancel feeOn-time81%
LufthansaCheapest$589Average$894FlexibilityNo cancel feeOn-time76%
Air FranceCheapest$594Average$673FlexibilityNo cancel feeOn-time77%
SWISSCheapest$596Average$833FlexibilityNo cancel feeOn-time79%
United AirlinesCheapest$601Average$789FlexibilityNo cancel feeOn-time69%
Austrian AirlinesCheapest$606Average$986FlexibilityNo cancel feeOn-time78%
British AirwaysCheapest$613Average$808FlexibilityNo cancel feeOn-time70%
Air SerbiaCheapest$652Average$1,019FlexibilityNo cancel feeOn-timeN/A

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