HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Bulgaria

$303+ Cheap flights from Illinois 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 7/9. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — SOF
May 6 — May 131
Tue 5/6
Tue 5/13
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Illinois 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 Illinois to Bulgaria

Keep the following information in mind while searching for Illinois to Bulgaria flight deals. Data was last updated May 1, 2025.

Most accurate provider

AranGrant
3 stars

Most trusted provider

AranGrant
3 stars

Round-trip from

$629
(FlightHub)

One-way from

$368
(Kiwi.com)

Popular in

June

Cheapest in

February

Average price

$1,001
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 Illinois to Bulgaria
Search Deals
One-way flight from Illinois to Bulgaria
Search Deals
Highest demand for flights based on searches. 29% potential increase in price ($320 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 5% potential price decrease ($40 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in May 2025
Search Deals

Find flight deals from Illinois to Bulgaria

Cheapest flights from Illinois to Bulgaria
Explore the most affordable flight options available from Illinois to Bulgaria. Find the lowest fares from popular airlines and budget airlines, with prices last updated on May 1, 2025.

This FlightHub deal was found by Cheapflights users on 4/29. 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.
Tue 8/1211:25 amORD - SOF
1 stop13h 10mTurkish Airlines
Wed 9/173:35 pmSOF - ORD
1 stop26h 05mTurkish Airlines
Deal found 4/29$625
This CrystalTravel deal was found by Cheapflights users on 4/29. 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 4/29$627
This FlightHub deal was found by Cheapflights users on 4/30. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/62:20 pmORD - SOF
1 stop11h 45mMultiple Airlines
Wed 8/206:40 pmSOF - ORD
1 stop26h 15mMultiple Airlines
Deal found 4/30$629
This United Airlines deal was found by Cheapflights users on 4/30. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/69:40 pmORD - SOF
1 stop17h 20mUnited Airlines
Wed 8/206:15 amSOF - ORD
2 stops17h 40mUnited Airlines
Deal found 4/30$637
This SWISS deal was found by Cheapflights users on 4/29. 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.
Tue 7/292:20 pmORD - SOF
1 stop11h 45mSWISS
Mon 8/183:30 pmSOF - ORD
1 stop32h 25mSWISS
Deal found 4/29$644
This British Airways deal was found by Cheapflights users on 4/30. 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 British Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/294:55 pmORD - SOF
1 stop19h 45mBritish Airways
Fri 9/262:20 pmSOF - ORD
2 stops26h 53mBritish Airways
Deal found 4/30$657
This Austrian Airlines deal was found by Cheapflights users on 4/30. 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 Austrian Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 7/204:20 pmORD - SOF
1 stop17h 50mAustrian Airlines
Mon 10/206:55 pmSOF - ORD
1 stop26h 25mAustrian Airlines
Deal found 4/30$660
This United deal was found by Cheapflights users on 4/29. 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 is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/94:20 pmORD - VAR
1 stop12h 25mMultiple Airlines
Tue 8/199:00 pmVAR - ORD
1 stop23h 10mMultiple Airlines
Deal found 4/29$668
This Air Canada deal was found by Cheapflights users on 4/30. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 7/278:50 amORD - SOF
2 stops25h 00mAir Canada
Mon 10/206:15 amSOF - ORD
2 stops33h 46mAir Canada
Deal found 4/30$679
This Air Serbia deal was found by Cheapflights users on 4/29. 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 8/911:20 pmORD - SOF
1 stop32h 15mAir Serbia
Mon 9/155:00 amSOF - ORD
1 stop19h 40mAir Serbia
Deal found 4/29$706
This oojo deal was found by Cheapflights users on 4/29. 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.
Mon 5/59:40 pmORD - SOF
1 stop32h 15mLOT
Mon 5/196:40 pmSOF - ORD
1 stop28h 15mLOT
Deal found 4/29$727
This Austrian Airlines deal was found by Cheapflights users on 4/29. 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.
Sun 8/104:20 pmORD - VAR
1 stop12h 25mAustrian Airlines
Wed 9/34:00 pmVAR - ORD
1 stop29h 20mAustrian Airlines
Deal found 4/29$731

Cheapflights Fare Finder

Customize your flight search to find flights from Illinois 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 May 1, 2025.
Use the filters below to find and compare flights from Illinois to Bulgaria that are best for you.

Fly from

Illinois

Fly to

Bulgaria

Route

Depart

Return

Price

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

Tue 7/22

2:20 pm-10:05 am

1 stop11h 45m

Sofia

Fri 10/17

8:00 am-1:20 pm

1 stop13h 20m

$633

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

Sun 7/27

11:25 am-8:35 am

1 stop13h 10m

Sofia

Fri 10/17

3:35 pm-9:40 am

1 stop26h 05m

$639

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

Tue 7/29

2:20 pm-10:05 am

1 stop11h 45m

Sofia

Mon 8/18

3:30 pm-3:55 pm

1 stop32h 25m

$644

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

Tue 7/22

1:05 pm-6:40 pm

2 stops21h 35m

Sofia

Fri 10/17

6:15 am-9:51 am

2 stops35h 36m

$648

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

Tue 7/29

4:55 pm-8:40 pm

1 stop19h 45m

Sofia

Fri 9/26

2:20 pm-9:13 am

2 stops26h 53m

$657

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

Sun 7/20

4:20 pm-6:10 pm

1 stop17h 50m

Sofia

Mon 10/20

6:55 pm-1:20 pm

1 stop26h 25m

$660

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

Sun 7/20

9:40 pm-11:00 pm

1 stop17h 20m

Sofia

Tue 10/14

6:20 am-6:21 pm

2 stops20h 01m

$667

ChicagoVarna

ORD - VAR

ORDVAR

Chicago O'Hare Intl

Sat 8/9

4:20 pm-12:45 pm

1 stop12h 25m

Varna

Tue 8/19

9:00 pm-12:10 pm

1 stop23h 10m

$668

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

Sun 7/27

8:50 am-5:50 pm

2 stops25h 00m

Sofia

Mon 10/20

6:15 am-8:01 am

2 stops33h 46m

$679

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

Mon 5/5

9:40 pm-1:55 pm

1 stop32h 15m

Sofia

Mon 5/19

6:40 pm-2:55 pm

1 stop28h 15m

$727

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/29

Showing 1-10 of 37 results
1
2
3
4

Best time to book a flight from Illinois to Bulgaria

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

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

Currently, November is the cheapest month in which you can book a flight from Illinois to Bulgaria (average of $632). Flying from Illinois to Bulgaria in June is currently the most expensive (average of $1,218). 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 IL to BG?

Find hourly flight availability from Illinois 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 May 1, 2025.

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Illinois to Bulgaria as you normally would.

Rainfall in Bulgaria by month

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

In terms of precipitation, rainfall in Bulgaria 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 Bulgaria when rainfall is around 1.2 in.

Temperature in Bulgaria by month

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

If weather is an important factor for your trip to Bulgaria, 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 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 May 1, 2025.
Read reviews from past customers who have flown KLM, LOT and Austrian Airlines from Illinois to Bulgaria. In addition to providing an overall rating, users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
KLM
7.8
Good
1,334 reviews

Overall

7.8

Comfort

7.7

Boarding

7.8

Food

7.2

Crew

8.4

Entertainment

7.1

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
1,334 reviews
KLM
7.8
Good
1,334 reviews

Overall

7.8

Comfort

7.7

Boarding

7.8

Food

7.2

Crew

8.4

Entertainment

7.1

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
1,069 reviews
KLM
7.8
Good
1,334 reviews

Overall

7.8

Comfort

7.7

Boarding

7.8

Food

7.2

Crew

8.4

Entertainment

7.1

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
781 reviews
KLM
7.8
Good
1,334 reviews

Overall

7.8

Comfort

7.7

Boarding

7.8

Food

7.2

Crew

8.4

Entertainment

7.1

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
1,588 reviews
KLM
7.8
Good
1,334 reviews

Overall

7.8

Comfort

7.7

Boarding

7.8

Food

7.2

Crew

8.4

Entertainment

7.1

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
7.4
Good
1,446 reviews
KLM
7.8
Good
1,334 reviews

Overall

7.8

Comfort

7.7

Boarding

7.8

Food

7.2

Crew

8.4

Entertainment

7.1

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 Illinois 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 Illinois to Bulgaria one-way?

    One-way options have recently been found by users for as low as $370 on Air Serbia. Other airlines that offer cheap prices include Turkish Airlines from $430 and KLM from $496 one-way.

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

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

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

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

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

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

    Currently, November is the cheapest month in which you can book a flight from Illinois to Bulgaria (average of $632). Flying from Illinois to Bulgaria in June is currently the most expensive (average of $1,218). 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 Illinois to Bulgaria

See prices for flight routes from nearby airports that may be better suited for you.
John F Kennedy Intl to Heathrow flights
John F Kennedy Intl to Charles de Gaulle flights
Newark to Heathrow flights
John F Kennedy Intl to Leonardo da Vinci/Fiumicino flights
Newark to Charles de Gaulle flights
John F Kennedy Intl to Gatwick flights
Newark to Leonardo da Vinci/Fiumicino flights
Newark to Athens flights
John F Kennedy Intl to Lisbon flights
LaGuardia to Heathrow flights
John F Kennedy Intl to Istanbul flights
John F Kennedy Intl to Athens flights
John F Kennedy Intl to Orly flights
Boston to Heathrow flights
Los Angeles to Heathrow flights
John F Kennedy Intl to Barcelona-El Prat flights
John F Kennedy Intl to London City flights
Dulles Intl to Heathrow flights
Miami to Madrid flights
Newark to Barcelona-El Prat flights
Newark to Lisbon flights
San Francisco to Heathrow flights
Newark to Gatwick flights
Newark to Orly flights
LaGuardia to Charles de Gaulle flights
John F Kennedy Intl to Madrid flights
John F Kennedy Intl to Malpensa flights
O'Hare Intl to Heathrow flights
Dallas/Fort Worth to Heathrow flights
Seattle to Heathrow flights
O'Hare Intl to Leonardo da Vinci/Fiumicino flights
Newark to Dublin flights
John F Kennedy Intl to Dublin flights
Dulles Intl to Charles de Gaulle flights
Newark to Madrid flights
O'Hare Intl to Charles de Gaulle flights
Boston to Leonardo da Vinci/Fiumicino flights
O'Hare Intl to Athens flights
Baltimore to Heathrow flights
Dallas/Fort Worth to Charles de Gaulle flights
Boston to Charles de Gaulle flights
LaGuardia to Gatwick flights
LaGuardia to Leonardo da Vinci/Fiumicino flights
Dulles Intl to Leonardo da Vinci/Fiumicino flights
Newark to Malpensa flights
LaGuardia to Athens flights
Boston to Gatwick flights
Atlanta to Heathrow flights
San Francisco to Charles de Gaulle flights
Newark to Frankfurt flights

Top 10 airlines flying from Illinois to Bulgaria

Discover the top 10 airlines that operate flights from Illinois 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 May 1, 2025.
AirlineCheapestAverageFlexibilityOn-time
Turkish AirlinesCheapest$498Average$934FlexibilityNo cancel feeOn-time77%
LOTCheapest$574Average$872FlexibilityNo cancel feeOn-time81%
KLMCheapest$578Average$739FlexibilityNo cancel feeOn-time75%
Austrian AirlinesCheapest$611Average$984FlexibilityNo cancel feeOn-time78%
SWISSCheapest$611Average$1,027FlexibilityNo cancel feeOn-time79%
LufthansaCheapest$614Average$1,124FlexibilityNo cancel feeOn-time76%
United AirlinesCheapest$618Average$851FlexibilityNo cancel feeOn-time69%
British AirwaysCheapest$628Average$824FlexibilityNo cancel feeOn-time70%
Air SerbiaCheapest$634Average$1,029FlexibilityNo cancel feeOn-timeN/A
ITA AirwaysCheapest$679Average$890FlexibilityNo cancel feeOn-time81%

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.