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$335+ Cheap flights from Sofia (SOF) to Chicago (CHI)

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 1/10. Fares are subject to change and may not be available on all flights or dates of travel.
SOF — CHI
Nov 29 — Dec 61
Sat 11/29
Sat 12/6
1 adult, Economy
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Cheapflights Tip: The best prices from Sofia to Chicago are usually found in February or April, booked 89 days in advance, depart on a Thursday or Tuesday and return on a Thursday

Find flight deals from Sofia to Chicago

Cheapest flights from Sofia to Chicago
Explore the most affordable flight options available from Sofia to Chicago. Find the lowest fares from popular airlines and budget airlines, with prices last updated on October 30, 2025.

This Booking.com deal was found by Cheapflights users on 10/30. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/146:35 pmSOF - ORD
2 stops33h 20mLOT
Tue 12/309:55 pmORD - SOF
1 stop11h 55mLOT
Deal found 10/30$643
This Mytrip deal was found by Cheapflights users on 10/29. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/89:45 amSOF - ORD
2 stops15h 35mMultiple Airlines
Sat 11/156:30 pmORD - SOF
2 stops16h 20mMultiple Airlines
Deal found 10/29$657
This oojo deal was found by Cheapflights users on 10/29. 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.
Fri 11/219:35 amSOF - ORD
1 stop16h 50mTurkish Airlines
Fri 12/511:50 amORD - SOF
1 stop25h 00mTurkish Airlines
Deal found 10/29$688
This FlightHub deal was found by Cheapflights users on 10/28. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/276:35 pmSOF - ORD
1 stop33h 25mLOT
Thu 12/49:55 pmORD - SOF
1 stop11h 55mLOT
Deal found 10/28$695
This oojo deal was found by Cheapflights users on 10/29. 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 12/226:35 pmSOF - ORD
1 stop33h 25mLOT
Wed 4/159:40 pmORD - SOF
1 stop20h 20mLOT
Deal found 10/29$696
This British Airways deal was found by Cheapflights users on 10/28. 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 British Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/612:05 pmSOF - ORD
1 stop14h 40mBritish Airways
Thu 5/285:00 pmORD - SOF
1 stop12h 30mBritish Airways
Deal found 10/28$700
This Kiwi.com deal was found by Cheapflights users on 10/29. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/212:35 pmSOF - ORD
1 stop13h 30mLufthansa
Thu 12/410:35 pmORD - SOF
2 stops16h 10mLufthansa
Deal found 10/29$708
This United Airlines deal was found by Cheapflights users on 10/28. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/256:00 amSOF - ORD
2 stops16h 55mUnited Airlines
Tue 12/26:00 pmORD - SOF
1 stop11h 15mUnited Airlines
Deal found 10/28$717
This United Airlines deal was found by Cheapflights users on 10/28. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/146:10 amSOF - ORD
1 stop21h 55mUnited Airlines
Tue 12/307:05 amORD - SOF
2 stops22h 40mUnited Airlines
Deal found 10/28$719
This KLM deal was found by Cheapflights users on 10/29. 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 12/27:00 amSOF - MDW
2 stops19h 00mMultiple Airlines
Sat 12/61:50 pmMDW - SOF
2 stops16h 05mMultiple Airlines
Deal found 10/29$1,069
This KLM deal was found by Cheapflights users on 10/29. 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.
Fri 10/317:00 amSOF - MDW
2 stops17h 55mMultiple Airlines
Fri 12/51:14 pmMDW - SOF
2 stops16h 41mMultiple Airlines
Deal found 10/29$1,335
This Air France deal was found by Cheapflights users on 10/28. 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 Air France is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/307:00 amSOF - MDW
2 stops18h 25mMultiple Airlines
Mon 12/2912:45 pmMDW - SOF
2 stops17h 20mMultiple Airlines
Deal found 10/28$1,522

Cheap flight deals from Sofia to Chicago

Discover tips and strategies to find the most affordable flight options for your journey from Sofia (SOF) to Chicago (CHI). 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 30, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$643
(Booking.com)

One-way from

$335
(Kiwi.com)

Popular in

May

Cheapest in

February

Average price

$762
Provider with most accurate pricing for Sofia-Chicago (CHI) flight deals.
Search Deals
Provider most trusted by Cheapflights users for Sofia-Chicago (CHI) flights.
Search Deals
From Sofia to Chicago (CHI)
Search Deals
One-way flight from Sofia to Chicago (CHI)
Search Deals
Highest demand for flights based on searches. 3% potential increase in price ($23 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($20 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 Sofia to Chicago 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 30, 2025.
Use the filters below to find and compare flights from Sofia to Chicago that are best for you.

Fly from

Sofia

Fly to

Chicago

Route

Depart

Return

Price

SofiaChicago

SOF - ORD

SOFORD

Sofia

Wed 2/25

9:00 pm-1:50 pm

1 stop24h 50m

Chicago O'Hare Intl

Sat 5/16

5:10 pm-8:20 pm

2 stops19h 10m

$699

SofiaChicago

SOF - ORD

SOFORD

Sofia

Sat 12/6

12:05 pm-6:45 pm

1 stop14h 40m

Chicago O'Hare Intl

Sat 5/30

7:05 pm-8:20 pm

1 stop17h 15m

$700

SofiaChicago

SOF - ORD

SOFORD

Sofia

Sun 12/7

2:30 pm-1:50 pm

1 stop31h 20m

Chicago O'Hare Intl

Sat 5/30

7:05 pm-8:20 pm

1 stop17h 15m

$700

SofiaChicago

SOF - ORD

SOFORD

Sofia

Sun 12/14

6:10 am-8:05 pm

1 stop21h 55m

Chicago O'Hare Intl

Tue 12/30

7:05 am-1:45 pm

2 stops22h 40m

$719

SofiaChicago

SOF - ORD

SOFORD

Sofia

Thu 2/5

6:00 am-2:55 pm

2 stops16h 55m

Chicago O'Hare Intl

Wed 4/1

9:40 pm-11:00 pm

1 stop17h 20m

$719

SofiaChicago

SOF - ORD

SOFORD

Sofia

Sun 12/7

6:10 am-1:10 pm

1 stop15h 00m

Chicago O'Hare Intl

Thu 5/28

7:30 am-11:05 am

2 stops19h 35m

$720

SofiaChicago

SOF - ORD

SOFORD

Sofia

Sun 12/7

2:25 pm-8:05 pm

1 stop13h 40m

Chicago O'Hare Intl

Fri 5/29

10:50 am-1:15 pm

2 stops18h 25m

$720

SofiaChicago

SOF - ORD

SOFORD

Sofia

Thu 12/4

6:00 am-1:10 pm

1 stop15h 10m

Chicago O'Hare Intl

Fri 5/29

7:30 am-11:05 am

2 stops19h 35m

$720

SofiaChicago

SOF - ORD

SOFORD

Sofia

Tue 12/2

6:00 am-11:10 am

1 stop13h 10m

Chicago O'Hare Intl

Wed 5/27

7:30 am-11:05 am

2 stops19h 35m

$720

SofiaChicago

SOF - ORD

SOFORD

Sofia

Thu 11/27

6:00 am-6:45 pm

2 stops20h 45m

Chicago O'Hare Intl

Thu 12/4

10:35 am-1:50 pm

2 stops19h 15m

$720

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/29

Showing 1-10 of 24 results
1
2
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Compare providers for flights from Sofia to Chicago

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 Sofia to Chicago in October.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy2 starsTrust Score*3 stars
eDreamsPrice Accuracy3 starsTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*1 star
CheapflightsfaresPrice Accuracy3 starsTrust Score*2 stars
Justfly.comPrice Accuracy3 starsTrust 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 Sofia-Chicago flights, users find the pricing of eDreams to be most consistent on Cheapflights vs. eDreams Users can find the same prices on Sofia-Chicago flight deals on Cheapflights vs. eDreams >95% of the time. Price accuracy is based on data collected from Sofia-Chicago flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Sofia-Chicago flights, Cheapflights users trust eDreams the most. eDreams 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 Sofia-Chicago 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 Sofia to Chicago

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

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

Use this chart to determine the optimal time to book a round-trip flight from Sofia to Chicago. Price data was last updated on October 24, 2025.

The best time to book flights from Sofia to Chicago is 89 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.

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

Currently, February is the cheapest month in which you can book a flight from Sofia to Chicago (average of $525). Flying from Sofia to Chicago in August is currently the most expensive (average of $672). 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 SOF to CHI?

Find hourly flight availability from Sofia to Chicago. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated October 30, 2025.

A simple way to save on the total cost of your ticket is to fly from Sofia to Chicago at noon. If you’re flexible enough to do this you can expect to save up to 15% on your trip compared to booking a flight in the morning.

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

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

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

Warsaw (WAW) – chosen by Cheapflights users on 67% of 1-stop itineraries from Sofia to Chicago on Cheapflights.

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

Average round-trip fare for 1-stop flights from Sofia to Chicago, 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 $519.

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

Shortest average travel time for 1-stop one-way flights from Sofia to Chicago, 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: 13h 05m.

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

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

Flights via Warsaw (WAW) offer the fastest connection on this route, with an average layover time of 1h 03m.

Reviews of airlines servicing Chicago

Get insights into the airlines that provide service to Chicago. 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 Chicago. Reviews last updated October 30, 2025.
Read through reviews of airlines operating flights from Sofia to Chicago, such as KLM, LOT, and United Airlines. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
KLM
7.7
Good
1,406 reviews

Crew

8.4

Comfort

7.7

Food

7.3

Entertainment

7.1

Boarding

7.8

Overall

7.7

Reviews

1 / 20
2.0
Mediocre

Abisola,Oct 2025

LOS - CDG

The food option was finished and what wa left was vegan pasta so I had to go without food for an 8 hour flight without any sort of empathy from crew that was mean.
KLM
7.7
Good
1,406 reviews
KLM
7.7
Good
1,406 reviews

Crew

8.4

Comfort

7.7

Food

7.3

Entertainment

7.1

Boarding

7.8

Overall

7.7

Reviews

1 / 20
2.0
Mediocre

Abisola,Oct 2025

LOS - CDG

The food option was finished and what wa left was vegan pasta so I had to go without food for an 8 hour flight without any sort of empathy from crew that was mean.
LOT
7.6
Good
1,135 reviews
KLM
7.7
Good
1,406 reviews

Crew

8.4

Comfort

7.7

Food

7.3

Entertainment

7.1

Boarding

7.8

Overall

7.7

Reviews

1 / 20
2.0
Mediocre

Abisola,Oct 2025

LOS - CDG

The food option was finished and what wa left was vegan pasta so I had to go without food for an 8 hour flight without any sort of empathy from crew that was mean.
United Airlines
7.4
Good
8,998 reviews
KLM
7.7
Good
1,406 reviews

Crew

8.4

Comfort

7.7

Food

7.3

Entertainment

7.1

Boarding

7.8

Overall

7.7

Reviews

1 / 20
2.0
Mediocre

Abisola,Oct 2025

LOS - CDG

The food option was finished and what wa left was vegan pasta so I had to go without food for an 8 hour flight without any sort of empathy from crew that was mean.
Turkish Airlines
7.3
Good
4,031 reviews
KLM
7.7
Good
1,406 reviews

Crew

8.4

Comfort

7.7

Food

7.3

Entertainment

7.1

Boarding

7.8

Overall

7.7

Reviews

1 / 20
2.0
Mediocre

Abisola,Oct 2025

LOS - CDG

The food option was finished and what wa left was vegan pasta so I had to go without food for an 8 hour flight without any sort of empathy from crew that was mean.
Lufthansa
6.8
Okay
7,541 reviews
KLM
7.7
Good
1,406 reviews

Crew

8.4

Comfort

7.7

Food

7.3

Entertainment

7.1

Boarding

7.8

Overall

7.7

Reviews

1 / 20
2.0
Mediocre

Abisola,Oct 2025

LOS - CDG

The food option was finished and what wa left was vegan pasta so I had to go without food for an 8 hour flight without any sort of empathy from crew that was mean.

Related info for your journey

Find useful and relevant information for your journey from Sofia to Chicago. 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 from for flights from Sofia to Chicago?

    Most people fly from Sofia (SOF) if they book a flight from Sofia to Chicago. On average, Sofia has 0 outbound flights to Chicago per day from 8 airlines. Sofia is conveniently located just 4.2 mi from Sofia’s city center.

  • How long is the flight from Sofia to Chicago?

    For as low as $719, British Airways can have you in Chicago from Sofia in 21h 55m. There are 5194 mi between Sofia and Chicago. This flight may include one or multiple stops.

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

    Currently priced at $532, LOT will fly you from Sofia to Chicago and back. In addition to LOT, many other airlines offer competitively priced options for your trip. Search Cheapflights for deals from British Airways and Air France - these airlines can fly you to your destination from $546 and $560, respectively. LOT is priced at 30% lower than the current average price of a flight leaving 3 months from now.

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

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

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

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

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

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

    Currently, February is the cheapest month in which you can book a flight from Sofia to Chicago (average of $525). Flying from Sofia to Chicago in August is currently the most expensive (average of $672). 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

Traveling to a place near Chicago?

Book flights to Chicago if you plan to visit one of these locations
Merrillville
Lansing
Hammond
Porter
Benton Harbor

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Alternative routes for Sofia to Chicago

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

Top 8 airlines flying from Sofia to Chicago

Discover the top 8 airlines that operate flights from Sofia to Chicago. 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 30, 2025.
AirlineCheapestAverageFlexibilityOn-time
LOTCheapest$532Average$653FlexibilityNo cancel feeOn-time81%
British AirwaysCheapest$546Average$619FlexibilityNo cancel feeOn-time70%
Air FranceCheapest$560Average$670FlexibilityNo cancel feeOn-time77%
KLMCheapest$604Average$745FlexibilityNo cancel feeOn-time75%
Turkish AirlinesCheapest$625Average$716FlexibilityNo cancel feeOn-time77%
LufthansaCheapest$630Average$767FlexibilityNo cancel feeOn-time76%
United AirlinesCheapest$641Average$766FlexibilityNo cancel feeOn-time69%
Austrian AirlinesCheapest$654Average$796FlexibilityNo cancel feeOn-time78%

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