Sofia

$241+ 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 8/16. Fares are subject to change and may not be available on all flights or dates of travel.
CHI — SOF
jul. 12 — jul. 191
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Cheapflights Tip: The best prices from Chicago to Sofia are usually found in February or March, booked 68 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 julio 7, 2025.

Round-trip from

$608
(CheapOair)

One-way from

$241
(Kiwi.com)

Popular in

June

Cheapest in

February

Average price

$987
From Chicago (CHI) to Sofia
One-way flight from Chicago (CHI) to Sofia
Highest demand for flights based on searches. 27% potential increase in price ($290 potential increase over avg. RT price).
Cheapest flight prices on average. 5% potential price decrease ($38 potential savings vs. average RT price).
Average for round-trip flights in July 2025

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 julio 7, 2025.

This United Airlines deal was found by Cheapflights users on 7/6. 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.
jue. 7/172:24 pmORD - SOF
2 stops20h 16mUnited Airlines
mié. 8/276:00 amSOF - ORD
1 stop14h 30mUnited Airlines
Deal found 7/6$612
This Austrian Airlines deal was found by Cheapflights users on 7/5. 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.
jue. 9/44:20 pmORD - SOF
1 stop23h 35mAustrian Airlines
vie. 10/38:00 amSOF - ORD
1 stop13h 20mAustrian Airlines
Deal found 7/5$614
This Air Canada deal was found by Cheapflights users on 7/5. 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.
sáb. 7/123:50 pmORD - SOF
2 stops18h 50mAir Canada
mié. 8/276:00 amSOF - ORD
2 stops34h 01mAir Canada
Deal found 7/5$615
This FlightHub deal was found by Cheapflights users on 7/6. 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.
mié. 7/232:20 pmORD - SOF
1 stop11h 45mMultiple Airlines
mar. 11/256:00 amSOF - ORD
1 stop22h 05mMultiple Airlines
Deal found 7/6$616
This Air France deal was found by Cheapflights users on 7/5. 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.
lun. 8/181:08 pmMDW - SOF
2 stops16h 52mMultiple Airlines
mié. 8/277:00 amSOF - MDW
2 stops18h 37mMultiple Airlines
Deal found 7/5$618
This SWISS deal was found by Cheapflights users on 7/6. 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.
lun. 8/42:20 pmORD - SOF
2 stops13h 40mSWISS
lun. 8/253:30 pmSOF - ORD
1 stop32h 25mSWISS
Deal found 7/6$619
This deal was found by Cheapflights users on 7/5. 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 is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 8/253:35 pmORD - SOF
1 stop12h 25mLufthansa
sáb. 9/66:00 amSOF - ORD
1 stop14h 30mLufthansa
Deal found 7/5$623
This FlightHub deal was found by Cheapflights users on 7/7. 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.
sáb. 8/2311:25 amORD - SOF
1 stop13h 10mTurkish Airlines
sáb. 9/209:15 pmSOF - ORD
1 stop20h 25mTurkish Airlines
Deal found 7/7$634
This CrystalTravel deal was found by Cheapflights users on 7/6. 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.
sáb. 8/99:40 pmORD - SOF
1 stop20h 20mLOT
dom. 8/242:35 pmSOF - ORD
1 stop13h 05mLOT
Deal found 7/6$643
This KLM deal was found by Cheapflights users on 7/5. 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.
mié. 8/131:43 pmMDW - SOF
2 stops16h 17mKLM
mié. 8/277:00 amSOF - MDW
2 stops18h 37mKLM
Deal found 7/5$651
This Kiwi.com deal was found by Cheapflights users on 7/6. 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.
dom. 8/33:00 pmORD - SOF
1 stop13h 00mITA Airways
dom. 8/246:55 pmSOF - ORD
1 stop26h 15mITA Airways
Deal found 7/6$656
This Air France deal was found by Cheapflights users on 7/7. 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.
mié. 7/231:09 pmMDW - SOF
2 stops16h 51mAir France
sáb. 8/167:00 amSOF - MDW
2 stops22h 12mAir France
Deal found 7/7$1,015

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 julio 7, 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

lun. 9/1

10:30 pm-11:00 pm

2 stops16h 30m

Sofia

lun. 9/8

6:55 pm-1:20 pm

1 stop26h 25m

$608

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

jue. 7/17

2:24 pm-6:40 pm

2 stops20h 16m

Sofia

mié. 8/27

6:00 am-12:30 pm

1 stop14h 30m

$612

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

jue. 9/4

4:20 pm-11:55 pm

1 stop23h 35m

Sofia

vie. 10/3

8:00 am-1:20 pm

1 stop13h 20m

$614

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

jue. 8/7

9:55 am-12:00 pm

2 stops18h 05m

Sofia

mié. 8/27

6:00 am-8:01 am

2 stops34h 01m

$615

ChicagoSofia

MDW - SOF

MDWSOF

Chicago Midway

lun. 8/18

1:08 pm-2:00 pm

2 stops16h 52m

Sofia

mié. 8/27

7:00 am-5:37 pm

2 stops18h 37m

$618

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

lun. 8/4

2:20 pm-12:00 pm

2 stops13h 40m

Sofia

lun. 8/25

3:30 pm-3:55 pm

1 stop32h 25m

$619

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

jue. 9/25

4:00 pm-1:05 pm

1 stop13h 05m

Sofia

lun. 10/27

6:50 pm-2:10 pm

1 stop26h 20m

$621

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

sáb. 8/23

11:25 am-8:35 am

1 stop13h 10m

Sofia

sáb. 9/20

9:15 pm-9:40 am

1 stop20h 25m

$634

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

sáb. 8/9

9:40 pm-2:00 am

1 stop20h 20m

Sofia

dom. 8/24

2:35 pm-7:40 pm

1 stop13h 05m

$643

ChicagoSofia

MDW - SOF

MDWSOF

Chicago Midway

mié. 8/13

1:43 pm-2:00 pm

2 stops16h 17m

Sofia

mié. 8/27

7:00 am-5:37 pm

2 stops18h 37m

$651

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/7

Showing 1-10 of 21 results
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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 June 27, 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 68 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 $1,189). 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 julio 7, 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.

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 julio 7, 2025.
Read reviews from past customers who have flown KLM, LOT, and Austrian Airlines from Chicago to Sofia. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.

Entertainment

7.1

Boarding

7.8

Crew

8.4

Comfort

7.7

Overall

7.8

Food

7.3

Reviews

1 / 20
4.0
Okay

Anonymous,Jun 2025

AMS - BOS

A two and half hour delay caused havoc with all connections. Otherwise on board service was great.

Entertainment

7.1

Boarding

7.8

Crew

8.4

Comfort

7.7

Overall

7.8

Food

7.3

Reviews

1 / 20
4.0
Okay

Anonymous,Jun 2025

AMS - BOS

A two and half hour delay caused havoc with all connections. Otherwise on board service was great.

Entertainment

7.1

Boarding

7.8

Crew

8.4

Comfort

7.7

Overall

7.8

Food

7.3

Reviews

1 / 20
4.0
Okay

Anonymous,Jun 2025

AMS - BOS

A two and half hour delay caused havoc with all connections. Otherwise on board service was great.

Entertainment

7.1

Boarding

7.8

Crew

8.4

Comfort

7.7

Overall

7.8

Food

7.3

Reviews

1 / 20
4.0
Okay

Anonymous,Jun 2025

AMS - BOS

A two and half hour delay caused havoc with all connections. Otherwise on board service was great.

Entertainment

7.1

Boarding

7.8

Crew

8.4

Comfort

7.7

Overall

7.8

Food

7.3

Reviews

1 / 20
4.0
Okay

Anonymous,Jun 2025

AMS - BOS

A two and half hour delay caused havoc with all connections. Otherwise on board service was great.

Entertainment

7.1

Boarding

7.8

Crew

8.4

Comfort

7.7

Overall

7.8

Food

7.3

Reviews

1 / 20
4.0
Okay

Anonymous,Jun 2025

AMS - BOS

A two and half hour delay caused havoc with all connections. Otherwise on board service was great.

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 10 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, United Airlines ($612), Austrian Airlines ($614), and Air Canada ($615) offers the cheapest pricing from Chicago to Sofia. United Airlines is currently priced 18% 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 ITA Airways, with whom users have recently found tickets for as low as $310. However, be on the lookout for offers from SWISS and British Airways, 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?

  • 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 $45.

  • 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 $28.

  • Where are the least popular layover locations for Chicago to Sofia flights?

  • 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 $1,189). 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.

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 julio 7, 2025.
AirlineCheapestAverageFlexibilityOn-time
Turkish AirlinesCheapest$493Average$818FlexibilityNo cancel feeOn-time77%
Air FranceCheapest$498Average$608FlexibilityNo cancel feeOn-time77%
KLMCheapest$533Average$739FlexibilityNo cancel feeOn-time75%
LOTCheapest$569Average$877FlexibilityNo cancel feeOn-time81%
LufthansaCheapest$595Average$918FlexibilityNo cancel feeOn-time76%
SWISSCheapest$596Average$904FlexibilityNo cancel feeOn-time79%
Austrian AirlinesCheapest$604Average$884FlexibilityNo cancel feeOn-time78%
British AirwaysCheapest$613Average$778FlexibilityNo cancel feeOn-time70%
United AirlinesCheapest$615Average$800FlexibilityNo cancel feeOn-time69%
Air SerbiaCheapest$652Average$1,020FlexibilityNo cancel feeOn-timeN/A

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