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$340+ 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 4/6. Fares are subject to change and may not be available on all flights or dates of travel.
CHI — SOF
Apr 6 — Apr 131
Sun 4/6
Sun 4/13
1 adult, Economy
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Cheapflights Tip: The best prices from Chicago to Sofia are usually found in February or November, booked 51 days in advance, depart on a Thursday or Sunday and return on a Thursday

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 April 1, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$603
(British Airways)

One-way from

$340
(Kiwi.com)

Popular in

June

Cheapest in

February

Average price

$703
Provider with most accurate pricing for Chicago (CHI)-Sofia flight deals.
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Provider most trusted by Cheapflights users for Chicago (CHI)-Sofia flights.
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From Chicago (CHI) to Sofia
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One-way flight from Chicago (CHI) to Sofia
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Highest demand for flights based on searches. 29% potential increase in price ($322 potential increase over avg. RT price).
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Cheapest flight prices on average. 5% potential price decrease ($42 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 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 April 1, 2025.

This Air France deal was found by Cheapflights users on 4/1. 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.
Mon 7/145:10 pmORD - SOF
1 stop12h 50mAir France
Tue 9/167:00 amSOF - ORD
2 stops18h 39mAir France
Deal found 4/1$601
This British Airways deal was found by Cheapflights users on 4/1. 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.
Tue 4/229:15 pmORD - SOF
1 stop15h 25mBritish Airways
Wed 4/309:30 pmSOF - ORD
1 stop28h 45mBritish Airways
Deal found 4/1$603
This KLM deal was found by Cheapflights users on 4/1. 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.
Sun 4/274:20 pmORD - SOF
1 stop13h 40mKLM
Thu 5/87:00 amSOF - ORD
1 stop15h 10mKLM
Deal found 4/1$604
This oojo deal was found by Cheapflights users on 3/31. 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 7/3011:25 amORD - SOF
1 stop13h 10mTurkish Airlines
Wed 9/173:35 pmSOF - ORD
1 stop14h 25mTurkish Airlines
Deal found 3/31$612
This Air Serbia deal was found by Cheapflights users on 3/31. 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 Serbia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/1911:20 pmORD - SOF
1 stop19h 35mAir Serbia
Tue 5/134:05 pmSOF - ORD
1 stop30h 20mAir Serbia
Deal found 3/31$625
This CheapOair deal was found by Cheapflights users on 4/1. 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.
Mon 4/289:40 pmORD - SOF
1 stop13h 00mMultiple Airlines
Tue 5/136:20 amSOF - ORD
2 stops21h 52mMultiple Airlines
Deal found 4/1$631
This FlightHub deal was found by Cheapflights users on 4/1. 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.
Mon 4/286:35 pmORD - SOF
1 stop31h 30mSWISS
Wed 5/1410:50 amSOF - ORD
1 stop13h 05mSWISS
Deal found 4/1$635
This United Airlines deal was found by Cheapflights users on 4/1. 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 5/38:25 pmORD - SOF
2 stops32h 40mUnited Airlines
Thu 5/156:15 amSOF - ORD
2 stops21h 57mUnited Airlines
Deal found 4/1$640
This Lufthansa deal was found by Cheapflights users on 4/1. 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.
Wed 4/24:00 pmORD - SOF
1 stop17h 50mLufthansa
Tue 4/226:00 amSOF - ORD
1 stop20h 15mLufthansa
Deal found 4/1$665
This American Airlines deal was found by Cheapflights users on 4/1. 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.
Sat 5/39:15 pmORD - SOF
1 stop15h 05mAmerican Airlines
Fri 5/232:20 pmSOF - ORD
2 stops26h 11mAmerican Airlines
Deal found 4/1$718
This Air Canada deal was found by Cheapflights users on 4/1. 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.
Sat 4/196:05 pmORD - SOF
2 stops40h 35mAir Canada
Fri 5/26:15 amSOF - ORD
2 stops40h 40mAir Canada
Deal found 4/1$726
This Austrian Airlines deal was found by Cheapflights users on 3/31. 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 Austrian Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/111:15 amORD - SOF
2 stops22h 55mAustrian Airlines
Sat 4/1212:25 pmSOF - ORD
1 stop32h 55mAustrian Airlines
Deal found 3/31$746

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 April 1, 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

Tue 4/22

9:15 pm-8:40 pm

1 stop15h 25m

Sofia

Mon 5/5

8:00 pm-3:55 pm

1 stop27h 55m

$603

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

Sun 4/27

4:20 pm-2:00 pm

1 stop13h 40m

Sofia

Thu 5/8

7:00 am-2:10 pm

1 stop15h 10m

$604

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

Sun 4/27

1:25 pm-2:00 pm

2 stops16h 35m

Sofia

Thu 5/8

7:00 am-5:29 pm

2 stops18h 29m

$605

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

Sat 4/19

11:20 pm-2:55 am

1 stop19h 35m

Sofia

Tue 5/13

4:05 pm-2:25 pm

1 stop30h 20m

$625

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

Mon 4/28

9:40 pm-6:40 pm

1 stop13h 00m

Sofia

Tue 5/13

6:20 am-8:12 pm

2 stops21h 52m

$631

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

Mon 4/28

6:35 pm-10:05 am

1 stop31h 30m

Sofia

Wed 5/14

10:50 am-3:55 pm

1 stop13h 05m

$635

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

Sat 5/3

8:25 pm-1:05 pm

2 stops32h 40m

Sofia

Thu 5/15

6:15 am-8:12 pm

2 stops21h 57m

$640

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

Sun 4/20

11:25 am-8:35 am

1 stop13h 10m

Sofia

Wed 5/7

9:25 am-9:40 am

1 stop32h 15m

$688

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

Sat 5/3

9:15 pm-8:20 pm

1 stop15h 05m

Sofia

Fri 5/23

2:20 pm-8:31 am

2 stops26h 11m

$718

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

Sat 4/19

6:05 pm-6:40 pm

2 stops40h 35m

Sofia

Fri 5/2

6:15 am-2:55 pm

2 stops40h 40m

$726

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/1

Showing 1-10 of 25 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 April.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
eDreamsPrice Accuracy3 starsTrust Score*3 stars
AranGrantPrice Accuracy3 starsTrust Score*1 star
FlightHubPrice Accuracy3 starsTrust Score*3 stars
CheapflightsfaresPrice Accuracy1 starTrust Score*2 stars
CheapfaremartPrice Accuracy-Trust Score*3 stars
oojoPrice Accuracy3 starsTrust Score*2 stars
GotogatePrice 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 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 March 28, 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 51 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 $632). Flying from Chicago to Sofia in June is currently the most expensive (average of $1,243). 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 April 1, 2025.

It’s optimal to fly from Chicago to Sofia in the morning. By choosing this option you can save up to 31% 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 Sunday mornings when fares are most often at their lowest. Saturday at noon flights should be avoided if possible as fares are typically the most expensive at this time.

Rainfall in Sofia by month

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

In terms of precipitation, rainfall in Sofia ranges from 1.2 - 2.8 inches per month. June is typically the wettest month, when rainfall can reach 2.8 in. January is typically the driest time to visit Sofia when rainfall is around 1.2 in.

Temperature in Sofia by month

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

If weather is an important factor for your trip to Sofia, 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 68.0 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 30.2 F).

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 April 1, 2025.
Peruse reviews from past customers who have flown with KLM, LOT and Austrian Airlines from Chicago to Sofia to help guide your decision. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
KLM
7.8
Good
1,323 reviews

Overall

7.8

Food

7.3

Comfort

7.7

Entertainment

7.2

Boarding

7.8

Crew

8.4

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
1,323 reviews
KLM
7.8
Good
1,323 reviews

Overall

7.8

Food

7.3

Comfort

7.7

Entertainment

7.2

Boarding

7.8

Crew

8.4

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
1,323 reviews

Overall

7.8

Food

7.3

Comfort

7.7

Entertainment

7.2

Boarding

7.8

Crew

8.4

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
771 reviews
KLM
7.8
Good
1,323 reviews

Overall

7.8

Food

7.3

Comfort

7.7

Entertainment

7.2

Boarding

7.8

Crew

8.4

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
1,572 reviews
KLM
7.8
Good
1,323 reviews

Overall

7.8

Food

7.3

Comfort

7.7

Entertainment

7.2

Boarding

7.8

Crew

8.4

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.
United Airlines
7.4
Good
8,615 reviews
KLM
7.8
Good
1,323 reviews

Overall

7.8

Food

7.3

Comfort

7.7

Entertainment

7.2

Boarding

7.8

Crew

8.4

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 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 11 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.

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

    According to our current data, British Airways ($603), Air Serbia ($625), and SWISS ($635) offers the cheapest pricing from Chicago to Sofia. British Airways is currently priced 23% 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 British Airways, with whom users have recently found tickets for as low as $541. However, be on the lookout for offers from Turkish Airlines and United Airlines, 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. Warsaw 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, Sultan Ahmet Camii, and Beyazit Meydani. Taksim Square, Sultan Ahmet Camii, and Beyazit Meydani can be visited by traveling about 20.8 mi, 22.3 mi, and 21.7 mi respectively from Istanbul. Those on a layover in Istanbul in need of a rental car can book one at Istanbul for about $28.

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

    Most Warsaw visitors opt to spend their time at Warsaw Old Town, Natolin, and Pałac Kultury i Nauki. Warsaw Old Town, Natolin, and Pałac Kultury i Nauki are located about 6.1 mi, 5.0 mi, and 4.8 mi, respectively from Warsaw Frederic Chopin. Those on a layover in Warsaw in need of a rental car can book one at Warsaw Frederic Chopin for about $21.

  • 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 $632). Flying from Chicago to Sofia in June is currently the most expensive (average of $1,243). 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 April 1, 2025.
AirlineCheapestAverageFlexibilityOn-time
Turkish AirlinesCheapest$500Average$782FlexibilityNo cancel feeOn-time77%
LOTCheapest$577Average$875FlexibilityNo cancel feeOn-time81%
KLMCheapest$578Average$738FlexibilityNo cancel feeOn-time75%
Austrian AirlinesCheapest$614Average$1,046FlexibilityNo cancel feeOn-time78%
United AirlinesCheapest$616Average$869FlexibilityNo cancel feeOn-time69%
LufthansaCheapest$616Average$1,028FlexibilityNo cancel feeOn-time76%
British AirwaysCheapest$627Average$927FlexibilityNo cancel feeOn-time70%
Air SerbiaCheapest$658Average$1,061FlexibilityNo cancel feeOn-timeN/A
ITA AirwaysCheapest$673Average$865FlexibilityNo cancel feeOn-time81%
Air CanadaCheapest$682Average$962FlexibilityNo cancel feeOn-time67%

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