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$297+ 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 8/17. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — SOF
Apr 29 — May 61
Tue 4/29
Tue 5/6
1 adult, Economy
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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 April 24, 2025.

Most accurate provider

AranGrant
3 stars

Most trusted provider

AranGrant
3 stars

Round-trip from

$683
(Gotogate)

One-way from

$341
(Kiwi.com)

Popular in

June

Cheapest in

February

Average price

$624
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 Illinois to Bulgaria
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One-way flight from Illinois to Bulgaria
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Highest demand for flights based on searches. 29% potential increase in price ($322 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 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 April 24, 2025.

This FlightHub deal was found by Cheapflights users on 4/23. 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 8/57:50 pmORD - SOF
1 stop16h 35mTurkish Airlines
Fri 9/263:35 pmSOF - ORD
1 stop26h 05mTurkish Airlines
Deal found 4/23$620
This CrystalTravel deal was found by Cheapflights users on 4/23. 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 4/23$626
This CrystalTravel deal was found by Cheapflights users on 4/22. 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.
Wed 8/62:20 pmORD - SOF
2 stops13h 40mMultiple Airlines
Tue 8/268:00 amSOF - ORD
1 stop13h 20mMultiple Airlines
Deal found 4/22$634
This oojo deal was found by Cheapflights users on 4/23. 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 11/59:55 pmORD - SOF
1 stop31h 55mLOT
Sun 11/92:35 pmSOF - ORD
1 stop13h 25mLOT
Deal found 4/23$649
This Air Canada deal was found by Cheapflights users on 4/23. 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.
Wed 11/510:35 amORD - SOF
2 stops18h 25mAir Canada
Sun 11/96:00 amSOF - ORD
2 stops22h 25mAir Canada
Deal found 4/23$654
This United Airlines deal was found by Cheapflights users on 4/23. 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 7/232:20 pmORD - SOF
2 stops13h 40mUnited Airlines
Wed 11/196:00 amSOF - ORD
2 stops16h 45mUnited Airlines
Deal found 4/23$659
This Travelocity deal was found by Cheapflights users on 4/23. 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 Travelocity is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/12:20 pmORD - SOF
1 stop11h 45mSWISS
Mon 8/253:30 pmSOF - ORD
1 stop32h 25mSWISS
Deal found 4/23$660
This oojo deal was found by Cheapflights users on 4/22. 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.
Sat 8/1611:20 pmORD - SOF
1 stop19h 35mAir Serbia
Sun 8/314:05 pmSOF - ORD
1 stop32h 35mAir Serbia
Deal found 4/22$668
This Austrian Airlines deal was found by Cheapflights users on 4/21. 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.
Tue 8/124:20 pmORD - SOF
1 stop11h 20mAustrian Airlines
Mon 9/16:55 pmSOF - ORD
1 stop26h 25mAustrian Airlines
Deal found 4/21$730
This Orbitz deal was found by Cheapflights users on 4/23. 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 8/241:30 pmSTL - SOF
2 stops21h 10mAir Canada
Fri 9/512:45 pmSOF - STL
2 stops39h 12mAir Canada
Deal found 4/23$735
This FlightHub deal was found by Cheapflights users on 4/23. 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 5/79:40 pmORD - VAR
2 stops33h 35mLufthansa
Fri 11/74:00 pmVAR - ORD
2 stops34h 25mLufthansa
Deal found 4/23$737
This Orbitz deal was found by Cheapflights users on 4/23. 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 8/243:30 pmSTL - SOF
1 stop13h 35mMultiple Airlines
Fri 9/512:45 pmSOF - STL
2 stops39h 12mMultiple Airlines
Deal found 4/23$738

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 April 24, 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 8/5

7:50 pm-8:25 pm

1 stop16h 35m

Sofia

Fri 9/26

3:35 pm-9:40 am

1 stop26h 05m

$620

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

$626

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

Wed 8/6

2:20 pm-12:00 pm

2 stops13h 40m

Sofia

Tue 8/26

8:00 am-1:20 pm

1 stop13h 20m

$634

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

Wed 7/23

2:20 pm-12:00 pm

2 stops13h 40m

Sofia

Wed 11/19

6:00 am-2:45 pm

2 stops16h 45m

$659

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

Fri 8/1

2:20 pm-10:05 am

1 stop11h 45m

Sofia

Mon 8/25

3:30 pm-3:55 pm

1 stop32h 25m

$660

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

Sat 8/16

11:20 pm-2:55 am

1 stop19h 35m

Sofia

Sun 8/31

4:05 pm-4:40 pm

1 stop32h 35m

$668

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

Sat 10/18

6:30 pm-11:15 am

2 stops32h 45m

Sofia

Sun 11/2

5:00 am-8:57 am

2 stops34h 57m

$671

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

Wed 7/23

5:10 pm-5:55 pm

1 stop16h 45m

Sofia

Sat 8/16

6:40 pm-12:05 pm

1 stop25h 25m

$699

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

Tue 8/12

4:20 pm-11:40 am

1 stop11h 20m

Sofia

Mon 9/1

6:55 pm-1:20 pm

1 stop26h 25m

$730

St. LouisSofia

STL - SOF

STLSOF

Lambert-St Louis

Sun 8/24

1:30 pm-6:40 pm

2 stops21h 10m

Sofia

Fri 9/5

12:45 pm-7:57 pm

2 stops39h 12m

$735

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/22

Showing 1-10 of 40 results
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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 $1,243). 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 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 April 24, 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 April 24, 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
1,333 reviews

Food

7.2

Comfort

7.7

Boarding

7.8

Entertainment

7.1

Crew

8.4

Overall

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
1,333 reviews
KLM
7.8
Good
1,333 reviews

Food

7.2

Comfort

7.7

Boarding

7.8

Entertainment

7.1

Crew

8.4

Overall

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
1,066 reviews
KLM
7.8
Good
1,333 reviews

Food

7.2

Comfort

7.7

Boarding

7.8

Entertainment

7.1

Crew

8.4

Overall

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
780 reviews
KLM
7.8
Good
1,333 reviews

Food

7.2

Comfort

7.7

Boarding

7.8

Entertainment

7.1

Crew

8.4

Overall

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
1,582 reviews
KLM
7.8
Good
1,333 reviews

Food

7.2

Comfort

7.7

Boarding

7.8

Entertainment

7.1

Crew

8.4

Overall

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
7.4
Good
1,442 reviews
KLM
7.8
Good
1,333 reviews

Food

7.2

Comfort

7.7

Boarding

7.8

Entertainment

7.1

Crew

8.4

Overall

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 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 $416 on Turkish Airlines. Other airlines that offer cheap prices include Air Serbia from $448 and British Airways from $478 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 $1,243). 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.

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Alternative routes for Illinois to Bulgaria

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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 April 24, 2025.
AirlineCheapestAverageFlexibilityOn-time
Turkish AirlinesCheapest$498Average$940FlexibilityNo cancel feeOn-time77%
LOTCheapest$576Average$879FlexibilityNo cancel feeOn-time81%
KLMCheapest$578Average$739FlexibilityNo cancel feeOn-time75%
Austrian AirlinesCheapest$593Average$994FlexibilityNo cancel feeOn-time78%
LufthansaCheapest$614Average$1,125FlexibilityNo cancel feeOn-time76%
United AirlinesCheapest$617Average$856FlexibilityNo cancel feeOn-time69%
British AirwaysCheapest$628Average$913FlexibilityNo cancel feeOn-time70%
SWISSCheapest$637Average$1,059FlexibilityNo cancel feeOn-time79%
Air SerbiaCheapest$652Average$1,037FlexibilityNo cancel feeOn-timeN/A
ITA AirwaysCheapest$679Average$890FlexibilityNo cancel feeOn-time81%

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