HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Bulgaria

$305+ 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 5/12. Fares are subject to change and may not be available on all flights or dates of travel.
CHI — SOF
May 17 — May 241
Sun 5/17
Sun 5/24
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

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 April 17, 2026.

This FlightHub deal was found by Cheapflights users on 4/12. 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 9/1111:25 am
ORD
-
SOF
1 stop19h 35m
Turkish Airlines
Fri 9/252:05 pm
SOF
-
ORD
1 stop27h 35m
Turkish Airlines
Deal found 4/12$629
This FlightHub deal was found by Cheapflights users on 4/12. 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.
Thu 10/811:25 am
ORD
-
SOF
1 stop17h 50m
Turkish Airlines
Sun 10/182:05 pm
SOF
-
ORD
1 stop27h 35m
Turkish Airlines
Deal found 4/12$647
This FlightHub 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/168:10 pm
ORD
-
VAR
1 stop17h 10m
Turkish Airlines
Fri 9/253:45 am
VAR
-
ORD
1 stop13h 55m
Turkish Airlines
Deal found 4/15$648
This KAYAK deal was found by Cheapflights users on 4/12. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/19:20 pm
ORD
-
SOF
1 stop15h 30m
Turkish Airlines
Tue 11/174:00 pm
SOF
-
ORD
1 stop26h 05m
Turkish Airlines
Deal found 4/12$651
This FlightHub deal was found by Cheapflights users on 4/12. 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 9/288:10 pm
ORD
-
SOF
1 stop16h 05m
Turkish Airlines
Tue 10/133:50 pm
SOF
-
ORD
1 stop25h 50m
Turkish Airlines
Deal found 4/12$657
This KAYAK deal was found by Cheapflights users on 4/12. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/112:50 pm
ORD
-
SOF
1 stop18h 20m
Turkish Airlines
Wed 11/189:40 pm
SOF
-
ORD
1 stop20h 25m
Turkish Airlines
Deal found 4/12$661
This oojo deal was found by Cheapflights users on 4/12. 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.
Thu 4/168:10 pm
ORD
-
SOF
1 stop34h 50m
Turkish Airlines
Wed 6/103:50 pm
SOF
-
ORD
1 stop25h 50m
Turkish Airlines
Deal found 4/12$668
This oojo deal was found by Cheapflights users on 4/14. 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.
Sun 4/198:10 pm
ORD
-
SOF
1 stop16h 05m
Turkish Airlines
Tue 5/59:05 pm
SOF
-
ORD
1 stop20h 35m
Turkish Airlines
Deal found 4/14$669
This oojo deal was found by Cheapflights users on 4/12. 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.
Sun 4/198:10 pm
ORD
-
SOF
1 stop16h 05m
Turkish Airlines
Mon 5/189:05 pm
SOF
-
ORD
1 stop20h 35m
Turkish Airlines
Deal found 4/12$673
This Justfly.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 Justfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/188:10 pm
ORD
-
SOF
1 stop34h 50m
Turkish Airlines
Tue 9/13:50 pm
SOF
-
ORD
1 stop25h 50m
Turkish Airlines
Deal found 4/16$676
This oojo deal was found by Cheapflights users on 4/12. 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.
Sun 4/198:10 pm
ORD
-
SOF
1 stop34h 50m
Turkish Airlines
Sun 5/173:50 pm
SOF
-
ORD
1 stop25h 50m
Turkish Airlines
Deal found 4/12$682
This FlightHub deal was found by Cheapflights users on 4/14. 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 9/1111:25 am
ORD
-
SOF
1 stop19h 35m
Turkish Airlines
Sat 9/193:50 pm
SOF
-
ORD
1 stop25h 50m
Turkish Airlines
Deal found 4/14$685

Find flight deals from Chicago to Bulgaria

Keep the following information in mind while searching for Chicago to Bulgaria flight deals. Data was last updated April 17, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$629
(FlightHub)

One-way from

$305
(Kiwi.com)

Popular in

June

Cheapest in

February

Average price

$701
Provider with most accurate pricing for Chicago (CHI)-Sofia flight deals.
Search Deals
Provider most trusted by Cheapflights users for Chicago (CHI)-Sofia flights.
Search Deals
From Chicago (CHI) to Bulgaria
Search Deals
One-way flight from Chicago (CHI) to Bulgaria
Search Deals
Highest demand for flights based on searches. 24% potential increase in price ($234 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease ($32 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in April 2026
Search Deals

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 April 17, 2026.
Use the filters below to find and compare flights from Chicago to Bulgaria that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

ChicagoVarna

ORD - VAR

ORDVAR

Chicago O'Hare Intl

Wed 9/16

8:10 pm-9:20 pm

1 stop17h 10m

Varna

Fri 9/25

3:45 am-9:40 am

1 stop13h 55m

$648
Quickest round-trip

ChicagoVarna

ORD - VAR

ORDVAR

Chicago O'Hare Intl

Mon 4/27

11:25 am-8:30 am

1 stop13h 05m

Varna

Fri 5/8

3:45 am-9:40 am

1 stop13h 55m

$707

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

Mon 8/3

4:40 pm-3:30 pm

1 stop14h 50m

Sofia

Sat 10/3

5:00 am-9:15 pm

1 stop24h 15m

$806

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

Tue 7/28

5:10 pm-2:00 pm

1 stop12h 50m

Sofia

Tue 8/18

7:00 am-6:07 pm

2 stops19h 07m

$844

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

Sun 8/9

2:07 pm-2:00 pm

2 stops15h 53m

Sofia

Wed 9/16

7:00 am-6:07 pm

2 stops19h 07m

$848

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

Tue 7/21

3:53 pm-6:40 pm

2 stops18h 47m

Sofia

Tue 8/18

2:10 pm-2:55 pm

1 stop32h 45m

$861

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

Tue 7/28

3:10 pm-1:05 pm

1 stop13h 55m

Sofia

Tue 8/18

2:10 pm-2:55 pm

1 stop32h 45m

$864

ChicagoSofia

MDW - SOF

MDWSOF

Chicago Midway

Sun 5/10

1:22 pm-2:00 pm

2 stops16h 38m

Sofia

Sun 5/17

7:00 am-5:56 pm

2 stops18h 56m

$872

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

Sun 5/10

10:30 pm-7:20 pm

1 stop12h 50m

Sofia

Sun 5/17

9:05 pm-5:04 pm

2 stops27h 59m

$876

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

Fri 7/10

3:53 pm-6:40 pm

2 stops18h 47m

Sofia

Mon 3/15

2:25 pm-2:10 pm

1 stop30h 45m

$887

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/12

Showing 1-10 of 54 resultsSorted by cheapest first
1
2
3
...
6

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, October is the cheapest month in which you can book a flight from Chicago to Bulgaria (average of $385). Flying from Chicago to Bulgaria in May is currently the most expensive (average of $1,622). 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.

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 April 17, 2026.
Peruse reviews from past customers who have flown with SWISS,LOT, andUnited Airlines 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.
SWISS
7.6
Good
1,922 reviews

Boarding

7.7

Crew

8.3

Entertainment

6.8

Food

7.1

Comfort

7.4

Overall

7.6

Reviews

1 / 20
10.0
Excellent

Thomas,Mar 2026

BOS - ZRH

The business class seats on the new Swiss A350 are hard as a rock. Seems like a bit of a miss on the new "Swiss Senses" experience. Other than that, excellent service.
SWISS
7.6
Good
1,922 reviews
SWISS
7.6
Good
1,922 reviews

Boarding

7.7

Crew

8.3

Entertainment

6.8

Food

7.1

Comfort

7.4

Overall

7.6

Reviews

1 / 20
10.0
Excellent

Thomas,Mar 2026

BOS - ZRH

The business class seats on the new Swiss A350 are hard as a rock. Seems like a bit of a miss on the new "Swiss Senses" experience. Other than that, excellent service.
LOT
7.5
Good
1,189 reviews
SWISS
7.6
Good
1,922 reviews

Boarding

7.7

Crew

8.3

Entertainment

6.8

Food

7.1

Comfort

7.4

Overall

7.6

Reviews

1 / 20
10.0
Excellent

Thomas,Mar 2026

BOS - ZRH

The business class seats on the new Swiss A350 are hard as a rock. Seems like a bit of a miss on the new "Swiss Senses" experience. Other than that, excellent service.
United Airlines
7.4
Good
9,603 reviews
SWISS
7.6
Good
1,922 reviews

Boarding

7.7

Crew

8.3

Entertainment

6.8

Food

7.1

Comfort

7.4

Overall

7.6

Reviews

1 / 20
10.0
Excellent

Thomas,Mar 2026

BOS - ZRH

The business class seats on the new Swiss A350 are hard as a rock. Seems like a bit of a miss on the new "Swiss Senses" experience. Other than that, excellent service.
Turkish Airlines
7.3
Good
4,306 reviews
SWISS
7.6
Good
1,922 reviews

Boarding

7.7

Crew

8.3

Entertainment

6.8

Food

7.1

Comfort

7.4

Overall

7.6

Reviews

1 / 20
10.0
Excellent

Thomas,Mar 2026

BOS - ZRH

The business class seats on the new Swiss A350 are hard as a rock. Seems like a bit of a miss on the new "Swiss Senses" experience. Other than that, excellent service.
Lufthansa
6.8
Okay
7,930 reviews
SWISS
7.6
Good
1,922 reviews

Boarding

7.7

Crew

8.3

Entertainment

6.8

Food

7.1

Comfort

7.4

Overall

7.6

Reviews

1 / 20
10.0
Excellent

Thomas,Mar 2026

BOS - ZRH

The business class seats on the new Swiss A350 are hard as a rock. Seems like a bit of a miss on the new "Swiss Senses" experience. Other than that, excellent service.

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.

  • How long is the flight from Chicago to Bulgaria?

    For as low as $806, Turkish Airlines can have you in Bulgaria from Chicago in 14h 50m. There are 5194 mi between Chicago and Bulgaria. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

  • 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 $295. United Airlines flights start at $305 while deals on Air Serbia start at $335 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, October is the cheapest month in which you can book a flight from Chicago to Bulgaria (average of $385). Flying from Chicago to Bulgaria in May is currently the most expensive (average of $1,622). 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.

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 April 17, 2026.
AirlineCheapestAverageFlexibilityOn-time
KLMCheapest$425Average$652FlexibilityNo cancel feeOn-time75%
ITA AirwaysCheapest$508Average$1,097FlexibilityNo cancel feeOn-time81%
Turkish AirlinesCheapest$520Average$816FlexibilityNo cancel feeOn-time77%
United AirlinesCheapest$561Average$817FlexibilityNo cancel feeOn-time69%
SWISSCheapest$565Average$821FlexibilityNo cancel feeOn-time79%
Austrian AirlinesCheapest$575Average$848FlexibilityNo cancel feeOn-time78%
LOTCheapest$580Average$867FlexibilityNo cancel feeOn-time81%
LufthansaCheapest$583Average$823FlexibilityNo cancel feeOn-time76%
Air FranceCheapest$585Average$624FlexibilityNo cancel feeOn-time77%
British AirwaysCheapest$609Average$646FlexibilityNo cancel feeOn-time70%

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.