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Bulgaria

$248+ 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 1/22. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — SOF
Dec 3 — Dec 101
Wed 12/3
Wed 12/10
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 November 3, 2025.

Most accurate provider

Gotogate
3 stars

Most trusted provider

Gotogate
3 stars

Round-trip from

$553
(KAYAK)

One-way from

$248
(Kiwi.com)

Popular in

June

Cheapest in

February

Average price

$641
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. 26% potential increase in price ($259 potential increase over avg. RT price).
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Cheapest flight prices on average. 5% potential price decrease ($38 potential savings vs. average RT price).
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Average for round-trip flights in November 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 November 3, 2025.

This Mytrip deal was found by Cheapflights users on 11/2. 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.
Wed 12/312:50 pmORD - SOF
2 stops21h 30mMultiple Airlines
Wed 12/172:25 pmSOF - ORD
1 stop13h 40mMultiple Airlines
Deal found 11/2$558
This Flightnetwork deal was found by Cheapflights users on 11/3. 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 Flightnetwork is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/39:55 pmORD - SOF
1 stop11h 55mLOT
Wed 12/102:35 pmSOF - ORD
1 stop13h 25mLOT
Deal found 11/3$559
This Kiwi.com deal was found by Cheapflights users on 11/1. 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.
Thu 11/69:50 pmORD - SOF
1 stop16h 55mLufthansa
Thu 11/136:05 amSOF - ORD
1 stop20h 20mLufthansa
Deal found 11/1$566
This Mytrip deal was found by Cheapflights users on 11/2. 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.
Wed 12/316:50 pmORD - SOF
1 stop12h 25mMultiple Airlines
Tue 1/136:00 amSOF - ORD
2 stops21h 30mMultiple Airlines
Deal found 11/2$568
This FlightHub deal was found by Cheapflights users on 11/2. 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 11/611:50 amORD - SOF
1 stop25h 00mTurkish Airlines
Tue 11/189:40 pmSOF - ORD
1 stop28h 45mTurkish Airlines
Deal found 11/2$574
This Flightnetwork deal was found by Cheapflights users on 11/2. 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 Flightnetwork is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/912:50 pmORD - SOF
2 stops21h 30mAir Canada
Sat 11/226:25 amSOF - ORD
2 stops21h 35mAir Canada
Deal found 11/2$575
This oojo deal was found by Cheapflights users on 11/2. 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 11/129:55 pmORD - SOF
1 stop11h 55mLOT
Fri 12/122:35 pmSOF - ORD
1 stop13h 25mLOT
Deal found 11/2$577
This Gotogate deal was found by Cheapflights users on 11/2. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/99:50 pmORD - SOF
1 stop12h 30mMultiple Airlines
Sat 11/226:25 amSOF - ORD
2 stops21h 35mMultiple Airlines
Deal found 11/2$578
This Kiwi.com deal was found by Cheapflights users on 11/1. 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.
Wed 11/511:50 amORD - SOF
1 stop12h 55mTurkish Airlines
Sun 11/164:00 pmSOF - ORD
1 stop34h 25mTurkish Airlines
Deal found 11/1$580
This United Airlines deal was found by Cheapflights users on 11/3. 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.
Mon 12/298:51 amORD - SOF
2 stops20h 24mUnited Airlines
Wed 1/146:05 amSOF - ORD
1 stop16h 05mUnited Airlines
Deal found 11/3$584
This KLM deal was found by Cheapflights users on 11/3. 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.
Wed 12/31:13 pmORD - SOF
2 stops16h 52mKLM
Wed 12/107:00 amSOF - ORD
1 stop15h 20mKLM
Deal found 11/3$585
This Air Canada deal was found by Cheapflights users on 11/3. 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 12/312:50 pmORD - SOF
2 stops21h 30mAir Canada
Wed 12/106:05 amSOF - ORD
2 stops19h 43mAir Canada
Deal found 11/3$586

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 November 3, 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

Sun 4/26

5:55 pm-11:10 pm

1 stop21h 15m

Sofia

Wed 5/13

6:20 am-12:55 pm

1 stop14h 35m

$579

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

Tue 4/28

9:40 pm-11:10 pm

1 stop17h 30m

Sofia

Wed 5/13

2:00 pm-7:55 pm

1 stop13h 55m

$579

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

Sun 4/26

9:40 pm-11:10 pm

1 stop17h 30m

Sofia

Tue 5/12

6:10 am-12:55 pm

1 stop14h 45m

$579

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

Wed 1/14

9:50 pm-6:20 pm

1 stop12h 30m

Sofia

Tue 1/27

6:00 am-2:55 pm

2 stops16h 55m

$579

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

Wed 1/14

9:50 pm-10:45 pm

1 stop16h 55m

Sofia

Wed 1/28

6:10 am-6:51 pm

2 stops20h 41m

$579

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

Sun 1/18

6:00 pm-6:20 pm

1 stop16h 20m

Sofia

Wed 1/28

6:10 am-6:51 pm

2 stops20h 41m

$579

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

Sun 1/18

9:50 pm-6:20 pm

1 stop12h 30m

Sofia

Tue 1/27

6:00 am-2:55 pm

2 stops16h 55m

$579

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

Thu 2/26

11:50 am-3:10 pm

1 stop19h 20m

Sofia

Mon 3/2

9:40 pm-10:05 am

1 stop20h 25m

$583

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

Mon 12/29

8:51 am-1:15 pm

2 stops20h 24m

Sofia

Wed 1/14

6:05 am-2:10 pm

1 stop16h 05m

$584

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

Wed 4/29

4:15 pm-6:40 pm

2 stops18h 25m

Sofia

Wed 5/13

2:00 pm-7:55 pm

1 stop13h 55m

$584

Flights are sorted by cheapest round-trip flights first.

Deals found on 11/3

Showing 1-10 of 38 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, January is the cheapest month in which you can book a flight from Illinois to Bulgaria (average of $484). Flying from Illinois to Bulgaria in June is currently the most expensive (average of $826). 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 November 3, 2025.

One of the essential ways to save on airfare from Illinois to Bulgaria is to remain as flexible as possible. Flights that are in the morning tend to be the most expensive. A flight in the evening could potentially save you up to 24% on airfare.

What is the cheapest day to fly from Illinois to Bulgaria?

Use this chart to determine the cheapest time to fly round-trip from Illinois to Bulgaria. Price data was last updated on December 16, 2024.

Travelers seeking maximum savings on their Illinois to Bulgaria flight should consider departing on Tuesday mornings when fares are most often at their lowest. Sunday at noon flights should be avoided if possible as fares are typically the most expensive at this time.

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.

  • How long is the flight from Illinois to Bulgaria?

    There are many flights that can get you from Illinois to Bulgaria in 17h 30m. Fly via United Airlines, Lufthansa, or Turkish Airlines to get the fastest option. Illinois and Bulgaria are separated by a distance of 5194 mi. 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 Illinois to Bulgaria one-way?

    One-way options have recently been found by users for as low as $359 on Air Serbia. Other airlines that offer cheap prices include Air France from $456 and Lufthansa from $559 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, January is the cheapest month in which you can book a flight from Illinois to Bulgaria (average of $484). Flying from Illinois to Bulgaria in June is currently the most expensive (average of $826). 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 Illinois to Bulgaria

See prices for flight routes from nearby airports that may be better suited for you.
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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 November 3, 2025.
AirlineCheapestAverageFlexibilityOn-time
Turkish AirlinesCheapest$511Average$936FlexibilityNo cancel feeOn-time77%
KLMCheapest$533Average$696FlexibilityNo cancel feeOn-time75%
LOTCheapest$570Average$967FlexibilityNo cancel feeOn-time81%
Air FranceCheapest$585Average$624FlexibilityNo cancel feeOn-time77%
LufthansaCheapest$590Average$883FlexibilityNo cancel feeOn-time76%
SWISSCheapest$593Average$808FlexibilityNo cancel feeOn-time79%
United AirlinesCheapest$600Average$791FlexibilityNo cancel feeOn-time69%
Austrian AirlinesCheapest$606Average$883FlexibilityNo cancel feeOn-time78%
British AirwaysCheapest$611Average$759FlexibilityNo cancel feeOn-time70%
Air SerbiaCheapest$634Average$1,010FlexibilityNo cancel feeOn-timeN/A

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