HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Bulgaria

$246+ Cheap flights from Chicago (CHI) to Bulgaria

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 10/4. Fares are subject to change and may not be available on all flights or dates of travel.
CHI — SOF
Aug 5 — Aug 121
Tue 8/5
Tue 8/12
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Chicago to Bulgaria with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

Cheap flight deals from Chicago to Bulgaria

Keep the following information in mind while searching for Chicago to Bulgaria flight deals. Data was last updated July 31, 2025.

Round-trip from

$559
(CheapOair)

One-way from

$250
(Kiwi.com)

Popular in

June

Cheapest in

February

Average price

$884
From Chicago (CHI) to Bulgaria
Search Deals
One-way flight from Chicago (CHI) to Bulgaria
Search Deals
Highest demand for flights based on searches. 26% potential increase in price ($264 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 5% potential price decrease ($37 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in July 2025
Search Deals

Find flight deals from Chicago to Bulgaria

Cheapest flights from Chicago to Bulgaria
Explore the most affordable flight options available from Chicago to Bulgaria. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 31, 2025.

This CheapOair deal was found by Cheapflights users on 7/31. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/310:40 amORD - SOF
2 stops15h 25mMultiple Airlines
Wed 9/176:00 amSOF - ORD
1 stop14h 30mMultiple Airlines
Deal found 7/31$559
This SWISS deal was found by Cheapflights users on 7/31. 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 SWISS is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/227:05 pmORD - SOF
2 stops32h 55mSWISS
Mon 10/612:45 pmSOF - ORD
2 stops35h 10mSWISS
Deal found 7/31$560
This CheapOair deal was found by Cheapflights users on 7/31. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/1811:45 pmORD - VAR
1 stop25h 00mTurkish Airlines
Wed 9/310:10 pmVAR - ORD
1 stop19h 30mTurkish Airlines
Deal found 7/31$563
This Turkish Airlines deal was found by Cheapflights users on 7/31. 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 Turkish Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/1111:45 pmORD - SOF
1 stop31h 00mTurkish Airlines
Wed 9/173:35 pmSOF - ORD
1 stop26h 05mTurkish Airlines
Deal found 7/31$563
This Orbitz deal was found by Cheapflights users on 7/30. 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 Orbitz is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/54:55 pmORD - SOF
1 stop18h 15mBritish Airways
Wed 2/259:00 pmSOF - ORD
2 stops30h 18mBritish Airways
Deal found 7/30$566
This Lufthansa deal was found by Cheapflights users on 7/31. 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 Lufthansa is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/173:35 pmORD - SOF
1 stop12h 25mLufthansa
Wed 9/176:00 amSOF - ORD
1 stop14h 30mLufthansa
Deal found 7/31$577
This United Airlines deal was found by Cheapflights users on 7/31. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/169:40 pmORD - SOF
1 stop17h 20mUnited Airlines
Sat 9/276:15 amSOF - ORD
2 stops20h 19mUnited Airlines
Deal found 7/31$581
This Mytrip deal was found by Cheapflights users on 7/31. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/218:40 amORD - SOF
2 stops25h 10mAir Canada
Thu 9/46:00 amSOF - ORD
2 stops35h 51mAir Canada
Deal found 7/31$586
This deal was found by Cheapflights users on 7/31. 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 is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/164:20 pmORD - SOF
1 stop15h 00mAustrian Airlines
Mon 10/68:00 amSOF - ORD
1 stop13h 20mAustrian Airlines
Deal found 7/31$587
This Kiwi.com deal was found by Cheapflights users on 7/31. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/184:20 pmORD - VAR
1 stop14h 35mMultiple Airlines
Wed 9/39:30 pmVAR - ORD
2 stops23h 25mMultiple Airlines
Deal found 7/31$600
This Cheapflightsfares deal was found by Cheapflights users on 7/30. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/112:55 pmORD - VAR
2 stops18h 20mAustrian Airlines
Sun 10/59:35 pmVAR - ORD
1 stop23h 45mAustrian Airlines
Deal found 7/30$617
This Lufthansa deal was found by Cheapflights users on 7/31. 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 Lufthansa is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/264:00 pmORD - VAR
2 stops15h 15mLufthansa
Wed 9/179:30 pmVAR - ORD
1 stop28h 45mLufthansa
Deal found 7/31$629

Cheapflights Fare Finder

 
Customize your flight search to find flights from Chicago to Bulgaria 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 July 31, 2025.
Use the filters below to find and compare flights from Chicago to Bulgaria that are best for you.

Fly from

Chicago

Fly to

Bulgaria

Route

Depart

Return

Price

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

Wed 9/3

10:40 am-10:05 am

2 stops15h 25m

Sofia

Wed 9/17

6:00 am-12:30 pm

1 stop14h 30m

$559

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

Mon 9/22

7:05 pm-12:00 pm

2 stops32h 55m

Sofia

Mon 10/6

12:45 pm-3:55 pm

2 stops35h 10m

$560

ChicagoVarna

ORD - VAR

ORDVAR

Chicago O'Hare Intl

Mon 8/18

11:45 pm-8:45 am

1 stop25h 00m

Varna

Wed 9/3

10:10 pm-9:40 am

1 stop19h 30m

$563

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

Mon 8/11

11:45 pm-2:45 pm

1 stop31h 00m

Sofia

Wed 9/17

3:35 pm-9:40 am

1 stop26h 05m

$563

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

Sun 10/5

4:55 pm-7:10 pm

1 stop18h 15m

Sofia

Wed 2/25

9:00 pm-7:18 pm

2 stops30h 18m

$566

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

Sun 8/17

3:35 pm-12:00 pm

1 stop12h 25m

Sofia

Wed 9/17

6:00 am-12:30 pm

1 stop14h 30m

$577

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

Tue 9/16

9:40 pm-11:00 pm

1 stop17h 20m

Sofia

Sat 9/27

6:15 am-6:34 pm

2 stops20h 19m

$581

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

Thu 8/21

8:40 am-5:50 pm

2 stops25h 10m

Sofia

Thu 9/4

6:00 am-9:51 am

2 stops35h 51m

$586

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

Tue 9/16

4:20 pm-3:20 pm

1 stop15h 00m

Sofia

Mon 10/6

8:00 am-1:20 pm

1 stop13h 20m

$587

ChicagoVarna

ORD - VAR

ORDVAR

Chicago O'Hare Intl

Mon 8/18

4:20 pm-2:55 pm

1 stop14h 35m

Varna

Wed 9/3

9:30 pm-12:55 pm

2 stops23h 25m

$600

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/31

Showing 1-10 of 29 results
1
2
3

Best time to book a flight from Chicago to Bulgaria

Have a flexible travel schedule? Discover the best time to fly to Bulgaria 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 Bulgaria

What is the cheapest month to book a flight from Chicago to Bulgaria?

Currently, November is the cheapest month in which you can book a flight from Chicago to Bulgaria (average of $632). Flying from Chicago to Bulgaria in June is currently the most expensive (average of $1,187). 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 BG?

Find hourly flight availability from Chicago to Bulgaria. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated July 31, 2025.

When flying from Chicago to Bulgaria, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

Reviews of airlines servicing Bulgaria

Get insights into the airlines that provide service to Bulgaria. 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 Bulgaria. Reviews last updated July 31, 2025.
Peruse reviews from past customers who have flown with KLM, Austrian Airlines, and Air France from Chicago to Bulgaria to help guide your decision. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
KLM
7.8
Good
1,383 reviews

Comfort

7.7

Boarding

7.8

Food

7.3

Crew

8.4

Overall

7.8

Entertainment

7.1

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.
KLM
7.8
Good
1,383 reviews
KLM
7.8
Good
1,383 reviews

Comfort

7.7

Boarding

7.8

Food

7.3

Crew

8.4

Overall

7.8

Entertainment

7.1

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.
Austrian Airlines
7.6
Good
823 reviews
KLM
7.8
Good
1,383 reviews

Comfort

7.7

Boarding

7.8

Food

7.3

Crew

8.4

Overall

7.8

Entertainment

7.1

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.
Air France
7.5
Good
1,465 reviews
KLM
7.8
Good
1,383 reviews

Comfort

7.7

Boarding

7.8

Food

7.3

Crew

8.4

Overall

7.8

Entertainment

7.1

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.
SWISS
7.5
Good
1,686 reviews
KLM
7.8
Good
1,383 reviews

Comfort

7.7

Boarding

7.8

Food

7.3

Crew

8.4

Overall

7.8

Entertainment

7.1

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.
United Airlines
7.4
Good
8,900 reviews
KLM
7.8
Good
1,383 reviews

Comfort

7.7

Boarding

7.8

Food

7.3

Crew

8.4

Overall

7.8

Entertainment

7.1

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 Bulgaria. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

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

    To fly one-way, consider booking your trip with Turkish Airlines, which is currently one of the cheapest options available, starting at $289. British Airways flights start at $341 while deals on SWISS start at $344 one-way.

  • What are the most popular routes from Chicago to Bulgaria?

    The most popular route from Chicago to Bulgaria is Chicago O'Hare Intl - Sofia. You may also consider Chicago Midway - Sofia or Chicago O'Hare Intl - Varna.

  • Can I find deals for flights from Chicago to Bulgaria that include hotel bookings?

    Yes. In addition to deals on Chicago to Bulgaria flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Chicago to Bulgaria?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Chicago to Bulgaria.

  • Can I find deals for business class flights from Chicago to Bulgaria?

    Yes. Cheapflights offers flight deals from Chicago to Bulgaria 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 Bulgaria?

    Currently, November is the cheapest month in which you can book a flight from Chicago to Bulgaria (average of $632). Flying from Chicago to Bulgaria in June is currently the most expensive (average of $1,187). 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

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Chicago to Bulgaria

See prices for flight routes from nearby airports that may be better suited for you.
O'Hare Intl to Heathrow flights
O'Hare Intl to Leonardo da Vinci/Fiumicino flights
O'Hare Intl to Charles de Gaulle flights
O'Hare Intl to Madrid flights
O'Hare Intl to Dublin flights
O'Hare Intl to Athens flights
O'Hare Intl to Gatwick flights
O'Hare Intl to London City flights
O'Hare Intl to Istanbul flights
O'Hare Intl to Frederic Chopin flights
O'Hare Intl to Frankfurt flights
O'Hare Intl to Orly flights
O'Hare Intl to Barcelona-El Prat flights
O'Hare Intl to Amsterdam flights
O'Hare Intl to Munich flights
Midway to Heathrow flights
O'Hare Intl to Stansted flights
Midway to Charles de Gaulle flights
O'Hare Intl to Edinburgh flights
O'Hare Intl to Luton flights
O'Hare Intl to Malpensa flights
Midway to Leonardo da Vinci/Fiumicino flights
O'Hare Intl to Lisbon flights
O'Hare Intl to Keflavik Intl flights
O'Hare Intl to Zurich flights
O'Hare Intl to Bruxelles-National flights
O'Hare Intl to Krakow flights
Midway to Madrid flights
O'Hare Intl to Vienna flights
Midway to Dublin flights
O'Hare Intl to Copenhagen flights
O'Hare Intl to Sabiha Gokcen flights
O'Hare Intl to Beauvais-Tille flights
O'Hare Intl to Otopeni Intl flights
Midway to Athens flights
St. Louis to Frankfurt flights
O'Hare Intl to Linate flights
Midway to Lisbon flights
O'Hare Intl to Belgrade flights
O'Hare Intl to Naples flights
St. Louis to Heathrow flights
O'Hare Intl to Sofia flights
Midway to Barcelona-El Prat flights
Midway to Frankfurt flights
Midway to Frederic Chopin flights
O'Hare Intl to Berlin flights
Midway to Keflavik Intl flights
O'Hare Intl to Vicenza flights
O'Hare Intl to Tirana flights
O'Hare Intl to Porto flights

Top 10 airlines flying from Chicago to Bulgaria

Discover the top 10 airlines that operate flights from Chicago to Bulgaria. 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 July 31, 2025.
AirlineCheapestAverageFlexibilityOn-time
Turkish AirlinesCheapest$494Average$929FlexibilityNo cancel feeOn-time77%
Air FranceCheapest$498Average$608FlexibilityNo cancel feeOn-time77%
KLMCheapest$533Average$739FlexibilityNo cancel feeOn-time75%
LOTCheapest$571Average$870FlexibilityNo cancel feeOn-time81%
LufthansaCheapest$588Average$1,080FlexibilityNo cancel feeOn-time76%
Austrian AirlinesCheapest$588Average$877FlexibilityNo cancel feeOn-time78%
SWISSCheapest$596Average$847FlexibilityNo cancel feeOn-time79%
United AirlinesCheapest$601Average$787FlexibilityNo cancel feeOn-time69%
British AirwaysCheapest$613Average$778FlexibilityNo cancel feeOn-time70%
Air SerbiaCheapest$652Average$1,020FlexibilityNo cancel feeOn-timeN/A

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.