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$347+ 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 5/5. Fares are subject to change and may not be available on all flights or dates of travel.
CHI — SOF
Apr 22 — Apr 291
Tue 4/22
Tue 4/29
1 adult, Economy
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Cheapflights Tip: The best prices from Chicago to Sofia are usually found in February or March, booked 74 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 17, 2025.

Most accurate provider

AranGrant
3 stars

Most trusted provider

AranGrant
3 stars

Round-trip from

$617
(CrystalTravel)

One-way from

$347
(Kiwi.com)

Popular in

June

Cheapest in

February

Average price

$621
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 ($324 potential increase over avg. RT price).
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Cheapest flight prices on average. 5% potential price decrease ($40 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 17, 2025.

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.
Mon 9/2911:45 pmORD - SOF
1 stop24h 50mTurkish Airlines
Tue 10/79:25 amSOF - ORD
1 stop32h 15mTurkish Airlines
Deal found 4/17$620
This Air Serbia 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 Serbia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/64:30 pmORD - SOF
1 stop15h 05mAir Serbia
Tue 9/24:05 pmSOF - ORD
1 stop30h 20mAir Serbia
Deal found 4/16$622
This StudentUniverse deal was found by Cheapflights users on 4/15. 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 StudentUniverse is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/264:20 pmORD - SOF
1 stop15h 00mMultiple Airlines
Sun 9/76:20 amSOF - ORD
1 stop14h 35mMultiple Airlines
Deal found 4/15$623
This Kiwi.com 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 4/276:35 pmORD - SOF
1 stop12h 10mSWISS
Mon 5/53:30 pmSOF - ORD
1 stop28h 40mSWISS
Deal found 4/16$624
This CrystalTravel 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 CrystalTravel is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/43:35 pmORD - SOF
1 stop12h 25mLufthansa
Mon 8/257:25 pmSOF - ORD
1 stop25h 05mLufthansa
Deal found 4/16$625
This oojo 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/239:40 pmORD - SOF
1 stop12h 15mLOT
Mon 9/292:35 pmSOF - ORD
1 stop32h 35mLOT
Deal found 4/16$637
This Air Canada deal was found by Cheapflights users on 4/15. 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.
Sun 5/1812:00 pmORD - SOF
2 stops16h 00mAir Canada
Wed 5/286:15 amSOF - ORD
2 stops21h 57mAir Canada
Deal found 4/15$641
This United Airlines deal was found by Cheapflights users on 4/15. 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 4/235:50 pmORD - SOF
1 stop21h 10mUnited Airlines
Wed 5/76:00 amSOF - ORD
1 stop14h 30mUnited Airlines
Deal found 4/15$645
This StudentUniverse deal was found by Cheapflights users on 4/15. 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 StudentUniverse is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 4/274:20 pmORD - SOF
1 stop11h 20mAustrian Airlines
Sat 5/108:00 amSOF - ORD
1 stop13h 20mAustrian Airlines
Deal found 4/15$646
This Air France deal was found by Cheapflights users on 4/15. 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 4/245:10 pmORD - SOF
1 stop12h 50mAir France
Tue 5/67:00 amSOF - ORD
1 stop16h 00mAir France
Deal found 4/15$654
This British Airways deal was found by Cheapflights users on 4/15. 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.
Sun 4/279:15 pmORD - SOF
1 stop13h 55mBritish Airways
Sun 5/119:10 pmSOF - ORD
1 stop24h 40mBritish Airways
Deal found 4/15$664
This KLM 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 KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/209:30 amMDW - SOF
2 stops20h 30mKLM
Mon 9/87:00 amSOF - MDW
2 stops19h 36mKLM
Deal found 4/16$742

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 17, 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

Mon 9/29

11:45 pm-8:35 am

1 stop24h 50m

Sofia

Tue 10/7

9:25 am-9:40 am

1 stop32h 15m

$620

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

Wed 8/6

4:30 pm-3:35 pm

1 stop15h 05m

Sofia

Tue 9/2

4:05 pm-2:25 pm

1 stop30h 20m

$622

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

Tue 8/26

4:20 pm-3:20 pm

1 stop15h 00m

Sofia

Sun 9/7

6:20 am-12:55 pm

1 stop14h 35m

$623

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

Sun 4/27

6:35 pm-2:45 pm

1 stop12h 10m

Sofia

Mon 5/5

3:30 pm-12:10 pm

1 stop28h 40m

$624

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

Mon 8/4

3:35 pm-12:00 pm

1 stop12h 25m

Sofia

Mon 8/25

7:25 pm-12:30 pm

1 stop25h 05m

$625

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

Tue 5/20

12:00 pm-12:00 pm

2 stops16h 00m

Sofia

Tue 5/27

6:20 am-8:12 pm

2 stops21h 52m

$639

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

Sun 5/18

12:00 pm-12:00 pm

2 stops16h 00m

Sofia

Wed 5/28

6:15 am-8:12 pm

2 stops21h 57m

$641

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

Sun 4/27

4:20 pm-11:40 am

1 stop11h 20m

Sofia

Sat 5/10

8:00 am-1:20 pm

1 stop13h 20m

$646

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

Sun 4/27

9:15 pm-7:10 pm

1 stop13h 55m

Sofia

Sun 5/11

9:10 pm-1:50 pm

1 stop24h 40m

$664

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

Thu 8/7

5:10 pm-2:00 am

2 stops24h 50m

Sofia

Sat 8/23

6:40 pm-12:05 pm

1 stop25h 25m

$668

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/16

Showing 1-10 of 26 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
FlightHubPrice Accuracy3 starsTrust Score*2 stars
AranGrantPrice Accuracy3 starsTrust Score*3 stars
oojoPrice Accuracy3 starsTrust Score*3 stars
CheapflightsfaresPrice Accuracy1 starTrust Score*2 stars
CheapfaremartPrice Accuracy-Trust Score*1 star
GotogatePrice Accuracy3 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 AranGrant to be most consistent on Cheapflights vs. AranGrant Users can find the same prices on Chicago-Sofia flight deals on Cheapflights vs. AranGrant >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 AranGrant the most. AranGrant 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 April 11, 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 74 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 17, 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 17, 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
1,329 reviews

Crew

8.4

Entertainment

7.1

Overall

7.8

Comfort

7.7

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
1,329 reviews
KLM
7.8
Good
1,329 reviews

Crew

8.4

Entertainment

7.1

Overall

7.8

Comfort

7.7

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
1,329 reviews

Crew

8.4

Entertainment

7.1

Overall

7.8

Comfort

7.7

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
1,329 reviews

Crew

8.4

Entertainment

7.1

Overall

7.8

Comfort

7.7

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
1,329 reviews

Crew

8.4

Entertainment

7.1

Overall

7.8

Comfort

7.7

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
1,329 reviews

Crew

8.4

Entertainment

7.1

Overall

7.8

Comfort

7.7

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 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, LOT ($617), Turkish Airlines ($620), and Air Serbia ($622) offers the cheapest pricing from Chicago to Sofia. LOT is currently priced 20% 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 Air Serbia, with whom users have recently found tickets for as low as $388. However, be on the lookout for offers from Lufthansa and Air Canada, 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 $30.

  • 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 $26.

  • 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
St. Louis to Sofia flights
Midway 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 17, 2025.
AirlineCheapestAverageFlexibilityOn-time
Turkish AirlinesCheapest$500Average$786FlexibilityNo cancel feeOn-time77%
LOTCheapest$577Average$878FlexibilityNo cancel feeOn-time81%
KLMCheapest$578Average$739FlexibilityNo cancel feeOn-time75%
Austrian AirlinesCheapest$614Average$1,026FlexibilityNo cancel feeOn-time78%
LufthansaCheapest$614Average$990FlexibilityNo cancel feeOn-time76%
United AirlinesCheapest$616Average$862FlexibilityNo cancel feeOn-time69%
British AirwaysCheapest$628Average$925FlexibilityNo cancel feeOn-time70%
SWISSCheapest$643Average$1,087FlexibilityNo cancel feeOn-time79%
Air SerbiaCheapest$652Average$1,044FlexibilityNo cancel feeOn-timeN/A
ITA AirwaysCheapest$679Average$865FlexibilityNo cancel feeOn-time81%

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