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$344+ 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 2/7. Fares are subject to change and may not be available on all flights or dates of travel.
SOF — CHI
Jan 17 — Jan 241
Sat 1/17
Sat 1/24
1 adult, Economy
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Cheapflights Tip: The best prices from Sofia to Chicago are usually found in February or April, booked 87 days in advance, depart on a Thursday or Tuesday and return on a Thursday

Cheap 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 December 18, 2025.

This oojo deal was found by Cheapflights users on 12/17. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/232:35 pmSOF - ORD
1 stop13h 25mLOT
Mon 1/269:55 pmORD - SOF
1 stop31h 55mLOT
Deal found 12/17$762
This FlightHub deal was found by Cheapflights users on 12/16. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/172:35 pmSOF - ORD
1 stop33h 45mLOT
Sat 1/179:55 pmORD - SOF
1 stop31h 55mLOT
Deal found 12/16$763
This United Airlines deal was found by Cheapflights users on 12/17. 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.
Tue 12/236:00 amSOF - ORD
1 stop17h 20mUnited Airlines
Mon 1/261:00 pmORD - SOF
2 stops16h 15mUnited Airlines
Deal found 12/17$847
This Air Canada deal was found by Cheapflights users on 12/17. 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.
Tue 12/236:00 amSOF - ORD
2 stops22h 10mAir Canada
Mon 1/2610:35 amORD - SOF
2 stops18h 40mAir Canada
Deal found 12/17$849
This United Airlines deal was found by Cheapflights users on 12/16. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/222:20 pmSOF - ORD
2 stops17h 24mUnited Airlines
Wed 4/159:40 pmORD - SOF
1 stop17h 30mUnited Airlines
Deal found 12/16$852
This oojo deal was found by Cheapflights users on 12/16. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/223:00 pmSOF - ORD
1 stop29h 45mSWISS
Wed 4/152:20 pmORD - SOF
1 stop11h 45mSWISS
Deal found 12/16$854

Find 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 December 18, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$675
(LOT)

One-way from

$344
(Kiwi.com)

Popular in

January

Cheapest in

February

Average price

$841
Provider with most accurate pricing for Sofia-Chicago (CHI) flight deals.
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Provider most trusted by Cheapflights users for Sofia-Chicago (CHI) flights.
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From Sofia to Chicago (CHI)
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One-way flight from Sofia to Chicago (CHI)
Search Deals
Highest demand for flights based on searches. 5% potential increase in price ($41 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($18 potential savings vs. average RT price).
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Average for round-trip flights in December 2025
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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 December 18, 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

Thu 1/15

5:00 am-5:20 pm

3 stops20h 20m

Chicago O'Hare Intl

Wed 1/28

6:30 pm-6:45 pm

2 stops16h 15m

$676

SofiaChicago

SOF - ORD

SOFORD

Sofia

Fri 1/16

7:00 am-2:20 pm

1 stop15h 20m

Chicago O'Hare Intl

Fri 1/23

5:20 pm-1:55 pm

1 stop12h 35m

$687

SofiaChicago

SOF - ORD

SOFORD

Sofia

Sat 1/17

7:00 am-2:20 pm

1 stop15h 20m

Chicago O'Hare Intl

Sun 1/25

5:20 pm-1:55 pm

1 stop12h 35m

$687

SofiaChicago

SOF - ORD

SOFORD

Sofia

Fri 1/16

7:00 am-2:20 pm

1 stop15h 20m

Chicago O'Hare Intl

Sun 1/25

5:20 pm-1:55 pm

1 stop12h 35m

$687

SofiaChicago

SOF - ORD

SOFORD

Sofia

Fri 1/30

7:00 am-2:20 pm

1 stop15h 20m

Chicago O'Hare Intl

Fri 2/6

1:58 pm-1:55 pm

2 stops15h 57m

$691

SofiaChicago

SOF - ORD

SOFORD

Sofia

Fri 1/16

7:00 am-2:20 pm

1 stop15h 20m

Chicago O'Hare Intl

Sat 1/24

12:55 pm-1:55 pm

2 stops17h 00m

$691

SofiaChicago

SOF - ORD

SOFORD

Sofia

Sat 1/17

7:00 am-2:20 pm

1 stop15h 20m

Chicago O'Hare Intl

Sat 1/24

12:55 pm-1:55 pm

2 stops17h 00m

$691

SofiaChicago

SOF - ORD

SOFORD

Sofia

Sat 1/17

7:00 am-2:20 pm

1 stop15h 20m

Chicago O'Hare Intl

Sat 1/24

4:25 pm-2:05 pm

1 stop13h 40m

$693

SofiaChicago

SOF - ORD

SOFORD

Sofia

Thu 2/5

7:10 am-3:10 pm

1 stop16h 00m

Chicago O'Hare Intl

Wed 2/18

5:20 pm-2:05 pm

1 stop12h 45m

$693

SofiaChicago

SOF - ORD

SOFORD

Sofia

Fri 4/10

5:25 am-7:50 pm

2 stops22h 25m

Chicago O'Hare Intl

Fri 5/1

5:10 pm-1:55 pm

1 stop12h 45m

$694

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/16

Showing 1-10 of 37 results
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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 December.
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 December 12, 2025.

The best time to book flights from Sofia to Chicago is 87 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 $524). Flying from Sofia to Chicago in August is currently the most expensive (average of $670). 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 December 18, 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 71% 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 $552.

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 December 18, 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
1,428 reviews

Overall

7.7

Crew

8.4

Comfort

7.6

Entertainment

7.1

Food

7.2

Boarding

7.8

Reviews

1 / 20
8.0
Excellent

Anonymous,Dec 2025

YYC - AMS

Not literally sitting in the very last row in the middle
KLM
7.7
Good
1,428 reviews
KLM
7.7
Good
1,428 reviews

Overall

7.7

Crew

8.4

Comfort

7.6

Entertainment

7.1

Food

7.2

Boarding

7.8

Reviews

1 / 20
8.0
Excellent

Anonymous,Dec 2025

YYC - AMS

Not literally sitting in the very last row in the middle
LOT
7.5
Good
1,149 reviews
KLM
7.7
Good
1,428 reviews

Overall

7.7

Crew

8.4

Comfort

7.6

Entertainment

7.1

Food

7.2

Boarding

7.8

Reviews

1 / 20
8.0
Excellent

Anonymous,Dec 2025

YYC - AMS

Not literally sitting in the very last row in the middle
United Airlines
7.4
Good
9,092 reviews
KLM
7.7
Good
1,428 reviews

Overall

7.7

Crew

8.4

Comfort

7.6

Entertainment

7.1

Food

7.2

Boarding

7.8

Reviews

1 / 20
8.0
Excellent

Anonymous,Dec 2025

YYC - AMS

Not literally sitting in the very last row in the middle
Turkish Airlines
7.3
Good
4,105 reviews
KLM
7.7
Good
1,428 reviews

Overall

7.7

Crew

8.4

Comfort

7.6

Entertainment

7.1

Food

7.2

Boarding

7.8

Reviews

1 / 20
8.0
Excellent

Anonymous,Dec 2025

YYC - AMS

Not literally sitting in the very last row in the middle
Lufthansa
6.8
Okay
7,635 reviews
KLM
7.7
Good
1,428 reviews

Overall

7.7

Crew

8.4

Comfort

7.6

Entertainment

7.1

Food

7.2

Boarding

7.8

Reviews

1 / 20
8.0
Excellent

Anonymous,Dec 2025

YYC - AMS

Not literally sitting in the very last row in the middle

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 7 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 $707, KLM can have you in Chicago from Sofia in 18h 29m. There are 5198 mi between Sofia and Chicago.

  • 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 KLM - these airlines can fly you to your destination from $546 and $607, respectively. LOT is priced at 32% lower than the current average price of a flight leaving 3 months from now.

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

    One-way options have recently been found by users for as low as $373 on Air Serbia. Other airlines that offer cheap prices include LOT from $548 and Turkish Airlines from $586 one-way.

  • 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 $524). Flying from Sofia to Chicago in August is currently the most expensive (average of $670). 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
Lansing
Merrillville
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 7 airlines flying from Sofia to Chicago

Discover the top 7 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 December 18, 2025.
AirlineCheapestAverageFlexibilityOn-time
LOTCheapest$533Average$672FlexibilityNo cancel feeOn-time81%
British AirwaysCheapest$546Average$619FlexibilityNo cancel feeOn-time70%
KLMCheapest$607Average$738FlexibilityNo cancel feeOn-time75%
Turkish AirlinesCheapest$625Average$727FlexibilityNo cancel feeOn-time77%
LufthansaCheapest$641Average$784FlexibilityNo cancel feeOn-time76%
United AirlinesCheapest$643Average$766FlexibilityNo cancel feeOn-time69%
Austrian AirlinesCheapest$647Average$781FlexibilityNo cancel feeOn-time78%

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