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$351+ 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 6/10. Fares are subject to change and may not be available on all flights or dates of travel.
SOF — CHI
Apr 22 — Apr 291
Tue 4/22
Tue 4/29
1 adult, Economy
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Cheapflights Tip: The best prices from Sofia to Chicago are usually found in November or May, booked 80 days in advance, depart on a Thursday or Tuesday and return on a Thursday

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 April 17, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$629
(KLM)

One-way from

$351
(Kiwi.com)

Popular in

January

Cheapest in

November

Average price

$679
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)
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Highest demand for flights based on searches. 2% potential increase in price ($22 potential increase over avg. RT price).
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Cheapest flight prices on average. 1% potential price decrease ($13 potential savings vs. average RT price).
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Average for round-trip flights in April 2025
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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 April 17, 2025.

This KLM deal was found by Cheapflights users on 4/17. 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 KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/287:00 amSOF - ORD
2 stops17h 08mKLM
Wed 5/144:50 pmORD - SOF
1 stop13h 10mKLM
Deal found 4/17$629
This Air France deal was found by Cheapflights users on 4/16. 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 Air France is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/247:00 amSOF - ORD
2 stops18h 46mMultiple Airlines
Mon 7/141:31 pmORD - SOF
2 stops16h 29mMultiple Airlines
Deal found 4/16$630
This FlightHub deal was found by Cheapflights users on 4/17. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/235:20 amSOF - ORD
1 stop22h 20mLOT
Sat 9/139:40 pmORD - SOF
1 stop32h 10mLOT
Deal found 4/17$641
This Air Canada deal was found by Cheapflights users on 4/17. 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.
Mon 5/266:15 amSOF - ORD
2 stops37h 09mAir Canada
Fri 9/1210:40 amORD - SOF
2 stops24h 00mAir Canada
Deal found 4/17$681
This Lufthansa deal was found by Cheapflights users on 4/17. 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 Lufthansa is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 5/266:00 amSOF - ORD
1 stop14h 30mLufthansa
Wed 9/109:40 pmORD - SOF
1 stop13h 00mLufthansa
Deal found 4/17$697
This United Airlines deal was found by Cheapflights users on 4/17. 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.
Wed 7/96:15 amSOF - ORD
1 stop16h 40mUnited Airlines
Mon 9/810:40 amORD - SOF
2 stops28h 10mUnited Airlines
Deal found 4/17$700
This FlightHub deal was found by Cheapflights users on 4/17. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 7/279:15 pmSOF - ORD
1 stop20h 25mTurkish Airlines
Sat 8/911:25 amORD - SOF
1 stop13h 10mTurkish Airlines
Deal found 4/17$718
This SWISS deal was found by Cheapflights users on 4/17. 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 SWISS is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 5/263:30 pmSOF - ORD
1 stop28h 40mSWISS
Mon 9/154:00 pmORD - SOF
2 stops34h 05mSWISS
Deal found 4/17$725
This American Airlines deal was found by Cheapflights users on 4/17. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 6/202:20 pmSOF - ORD
2 stops26h 21mAmerican Airlines
Sat 7/55:00 pmORD - SOF
2 stops19h 20mAmerican Airlines
Deal found 4/17$776
This British Airways deal was found by Cheapflights users on 4/16. 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 British Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/288:00 pmSOF - ORD
1 stop25h 50mBritish Airways
Wed 5/149:15 pmORD - SOF
1 stop32h 15mBritish Airways
Deal found 4/16$799
This Air France deal was found by Cheapflights users on 4/17. 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 France is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 5/257:00 amSOF - ORD
1 stop16h 00mAir France
Sat 9/131:35 pmORD - SOF
2 stops16h 25mAir France
Deal found 4/17$844
This KLM deal was found by Cheapflights users on 4/17. 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 KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 6/197:00 amSOF - MDW
2 stops19h 02mKLM
Mon 6/301:09 pmMDW - SOF
2 stops16h 51mKLM
Deal found 4/17$923

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 April 17, 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

Mon 4/28

7:00 am-4:08 pm

2 stops17h 08m

Chicago O'Hare Intl

Wed 5/14

4:50 pm-2:00 pm

1 stop13h 10m

$629

SofiaChicago

SOF - ORD

SOFORD

Sofia

Tue 6/24

7:00 am-5:46 pm

2 stops18h 46m

Chicago O'Hare Intl

Mon 7/14

1:31 pm-2:00 pm

2 stops16h 29m

$630

SofiaChicago

SOF - ORD

SOFORD

Sofia

Fri 5/23

5:20 am-7:40 pm

1 stop22h 20m

Chicago O'Hare Intl

Sat 9/13

9:40 pm-1:50 pm

1 stop32h 10m

$641

SofiaChicago

SOF - ORD

SOFORD

Sofia

Mon 5/26

6:15 am-11:24 am

2 stops37h 09m

Chicago O'Hare Intl

Fri 9/12

10:40 am-6:40 pm

2 stops24h 00m

$681

SofiaChicago

SOF - ORD

SOFORD

Sofia

Mon 5/26

6:00 am-12:30 pm

1 stop14h 30m

Chicago O'Hare Intl

Tue 9/9

3:35 pm-12:00 pm

1 stop12h 25m

$697

SofiaChicago

SOF - ORD

SOFORD

Sofia

Wed 7/9

6:15 am-2:55 pm

1 stop16h 40m

Chicago O'Hare Intl

Mon 9/8

10:40 am-10:50 pm

2 stops28h 10m

$700

SofiaChicago

SOF - ORD

SOFORD

Sofia

Sun 7/27

9:15 pm-9:40 am

1 stop20h 25m

Chicago O'Hare Intl

Sat 8/9

11:25 am-8:35 am

1 stop13h 10m

$718

SofiaChicago

SOF - ORD

SOFORD

Sofia

Mon 5/26

3:30 pm-12:10 pm

1 stop28h 40m

Chicago O'Hare Intl

Tue 9/9

6:00 pm-10:05 am

2 stops32h 05m

$725

SofiaChicago

SOF - ORD

SOFORD

Sofia

Fri 6/20

2:20 pm-8:41 am

2 stops26h 21m

Chicago O'Hare Intl

Sat 7/5

5:00 pm-8:20 pm

2 stops19h 20m

$776

SofiaChicago

SOF - ORD

SOFORD

Sofia

Mon 4/28

8:00 pm-1:50 pm

1 stop25h 50m

Chicago O'Hare Intl

Wed 5/14

9:15 pm-1:30 pm

1 stop32h 15m

$799

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/17

Showing 1-10 of 21 results
1
2
3

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 April.
ProviderPrice AccuracyTrust Score*
eDreamsPrice Accuracy3 starsTrust Score*3 stars
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*2 stars
oojoPrice Accuracy3 starsTrust Score*3 stars
CheapflightsfaresPrice Accuracy3 starsTrust Score*2 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 April 11, 2025.

The best time to book flights from Sofia to Chicago is 80 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, August is the cheapest month in which you can book a flight from Sofia to Chicago (average of $245). Flying from Sofia to Chicago in March is currently the most expensive (average of $321). 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 April 17, 2025.

A simple way to save on the total cost of your ticket is to fly from Sofia to Chicago in the afternoon. If you’re flexible enough to do this you can expect to save up to 14% on your trip compared to booking a flight in the evening.

What is the cheapest day to fly from Sofia to Chicago?

Use this chart to determine the cheapest time to fly round-trip from Sofia to Chicago. Price data was last updated on June 30, 2024.

Travelers seeking maximum savings on their Sofia to Chicago flight should consider departing on Wednesday at noon when fares are most often at their lowest. Wednesday evenings flights should be avoided if possible as fares are typically the most expensive at this time.

Rainfall in Chicago by month

Plan your trip to Chicago by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Chicago ranges from 1.7 - 4.9 inches per month. August is typically the wettest month, when rainfall can reach 4.9 in. January is typically the driest time to visit Chicago when rainfall is around 1.7 in.

Temperature in Chicago by month

Plan your trip to Chicago by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Chicago, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 73.4 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 23.0 F).

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 April 17, 2025.
Read through reviews of airlines operating flights from Sofia to Chicago, such as KLM, LOT and Austrian Airlines. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
KLM
7.8
Good
1,327 reviews

Entertainment

7.1

Comfort

7.7

Crew

8.4

Overall

7.8

Food

7.3

Boarding

7.8

Reviews

1 / 20
8.0
Excellent

Anonymous,Mar 2025

LBA - AMS

Overall, the flight from Leeds Bradford to Amsterdam was at expected. The crew were efficient at boarding and professional on board. The only issue was extremely slow check in at Leeds Bradford which was very frustrating.
KLM
7.8
Good
1,327 reviews
KLM
7.8
Good
1,327 reviews

Entertainment

7.1

Comfort

7.7

Crew

8.4

Overall

7.8

Food

7.3

Boarding

7.8

Reviews

1 / 20
8.0
Excellent

Anonymous,Mar 2025

LBA - AMS

Overall, the flight from Leeds Bradford to Amsterdam was at expected. The crew were efficient at boarding and professional on board. The only issue was extremely slow check in at Leeds Bradford which was very frustrating.
LOT
7.6
Good
1,065 reviews
KLM
7.8
Good
1,327 reviews

Entertainment

7.1

Comfort

7.7

Crew

8.4

Overall

7.8

Food

7.3

Boarding

7.8

Reviews

1 / 20
8.0
Excellent

Anonymous,Mar 2025

LBA - AMS

Overall, the flight from Leeds Bradford to Amsterdam was at expected. The crew were efficient at boarding and professional on board. The only issue was extremely slow check in at Leeds Bradford which was very frustrating.
Austrian Airlines
7.6
Good
775 reviews
KLM
7.8
Good
1,327 reviews

Entertainment

7.1

Comfort

7.7

Crew

8.4

Overall

7.8

Food

7.3

Boarding

7.8

Reviews

1 / 20
8.0
Excellent

Anonymous,Mar 2025

LBA - AMS

Overall, the flight from Leeds Bradford to Amsterdam was at expected. The crew were efficient at boarding and professional on board. The only issue was extremely slow check in at Leeds Bradford which was very frustrating.
Air France
7.5
Good
1,435 reviews
KLM
7.8
Good
1,327 reviews

Entertainment

7.1

Comfort

7.7

Crew

8.4

Overall

7.8

Food

7.3

Boarding

7.8

Reviews

1 / 20
8.0
Excellent

Anonymous,Mar 2025

LBA - AMS

Overall, the flight from Leeds Bradford to Amsterdam was at expected. The crew were efficient at boarding and professional on board. The only issue was extremely slow check in at Leeds Bradford which was very frustrating.
SWISS
7.5
Good
1,580 reviews
KLM
7.8
Good
1,327 reviews

Entertainment

7.1

Comfort

7.7

Crew

8.4

Overall

7.8

Food

7.3

Boarding

7.8

Reviews

1 / 20
8.0
Excellent

Anonymous,Mar 2025

LBA - AMS

Overall, the flight from Leeds Bradford to Amsterdam was at expected. The crew were efficient at boarding and professional on board. The only issue was extremely slow check in at Leeds Bradford which was very frustrating.

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.

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

    Currently priced at $629, KLM will fly you from Sofia to Chicago and back. In addition to KLM, many other airlines offer competitively priced options for your trip. Search Cheapflights for deals from LOT and Air Canada - these airlines can fly you to your destination from $641 and $681, respectively. KLM is priced at 13% 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 $417 on Air Serbia. Other airlines that offer cheap prices include British Airways from $629 and Qatar Airways from $638 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, August is the cheapest month in which you can book a flight from Sofia to Chicago (average of $245). Flying from Sofia to Chicago in March is currently the most expensive (average of $321). 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 Sofia?

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

Browse thousands of different options on Cheapflights for your next trip

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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 April 17, 2025.
AirlineCheapestAverageFlexibilityOn-time
KLMCheapest$460Average$785FlexibilityNo cancel feeOn-time75%
LOTCheapest$496Average$627FlexibilityNo cancel feeOn-time81%
British AirwaysCheapest$546Average$864FlexibilityNo cancel feeOn-time70%
Air FranceCheapest$560Average$672FlexibilityNo cancel feeOn-time77%
Austrian AirlinesCheapest$576Average$733FlexibilityNo cancel feeOn-time78%
LufthansaCheapest$601Average$768FlexibilityNo cancel feeOn-time76%
United AirlinesCheapest$603Average$718FlexibilityNo cancel feeOn-time69%
Turkish AirlinesCheapest$627Average$710FlexibilityNo cancel feeOn-time77%

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