Sofia

$306+ Cheap flights from Illinois to Sofia (SOF)

ORD — SOF
Nov 29 — Dec 61
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Cheap flight deals from Illinois to Sofia

Cheapest flights from Illinois to Sofia

Sun 11/2911:45 am -
1 stop25h 10m
Tue 12/159:45 pm -
1 stop20h 15m
Deal found 10/28$675
Sun 11/811:45 am -
1 stop19h 25m
Tue 11/244:00 pm -
1 stop26h 00m
Deal found 10/27$680
Wed 12/28:15 pm -
1 stop16h 40m
Wed 1/209:45 pm -
1 stop20h 15m
Deal found 10/25$688
Thu 11/2611:45 am -
1 stop19h 25m
Fri 12/119:45 pm -
1 stop20h 15m
Deal found 10/26$689
Wed 11/256:30 pm -
2 stops16h 30m
Sun 12/67:10 am -
2 stops18h 10m
Deal found 10/28$691
Wed 12/211:45 am -
1 stop12h 55m
Thu 1/219:45 pm -
1 stop20h 15m
Deal found 10/25$698
Thu 11/2611:45 am -
1 stop19h 25m
Sat 12/129:45 pm -
1 stop20h 15m
Deal found 10/26$699
Wed 11/49:15 pm -
1 stop27h 25m
Wed 11/189:30 am -
1 stop16h 50m
Deal found 10/26$700
Mon 11/238:15 pm -
1 stop16h 40m
Wed 3/179:30 am -
1 stop32h 30m
Deal found 10/26$702

Find flight deals from Illinois to Sofia

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$675
(Kissandfly.com)

One-way from

$306
(Kiwi.com)

Popular in

July

Cheapest in

February

Average price

$791
Provider with most accurate pricing for Chicago (CHI)-Sofia flight deals.
Provider most trusted by Cheapflights users for Chicago (CHI)-Sofia flights.
From Illinois to Sofia
One-way flight from Illinois to Sofia
Highest demand for flights based on searches. 21% potential increase in price ($222 potential increase over avg. RT price).
Cheapest flight prices on average. 3% potential price decrease ($31 potential savings vs. average RT price).
Average for round-trip flights in October 2026

Cheapflights Fare Finder

 
Use the filters below to find and compare flights from Illinois to Sofia that are best for you.

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Route

Depart

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Price

Cheapest round-trip

ChicagoSofia

ORD Chicago O'Hare Intl - SOF Sofia

ORDSOF

Chicago O'Hare Intl

Sun 11/15

8:10 pm-5:00 pm

2 stops36h 50m

Sofia

Wed 12/31

12:00 am-4:00 pm

Nonstop0h 00m

$306

ChicagoSofia

ORD Chicago O'Hare Intl - SOF Sofia

ORDSOF

Chicago O'Hare Intl

Wed 11/4

7:00 pm-9:50 am

3 stops54h 50m

Sofia

Wed 12/31

12:00 am-4:00 pm

Nonstop0h 00m

$328

ChicagoSofia

ORD Chicago O'Hare Intl - SOF Sofia

ORDSOF

Chicago O'Hare Intl

Wed 11/18

7:00 pm-9:35 pm

3 stops42h 35m

Sofia

Wed 12/31

12:00 am-4:00 pm

Nonstop0h 00m

$364

ChicagoSofia

ORD Chicago O'Hare Intl - SOF Sofia

ORDSOF

Chicago O'Hare Intl

Mon 11/23

6:30 pm-7:10 pm

3 stops40h 40m

Sofia

Wed 12/31

12:00 am-4:00 pm

Nonstop0h 00m

$364

ChicagoSofia

ORD Chicago O'Hare Intl - SOF Sofia

ORDSOF

Chicago O'Hare Intl

Mon 11/23

8:15 pm-8:55 pm

1 stop16h 40m

Sofia

Wed 12/31

12:00 am-4:00 pm

Nonstop0h 00m

$415

ChicagoSofia

ORD Chicago O'Hare Intl - SOF Sofia

ORDSOF

Chicago O'Hare Intl

Sat 11/7

8:05 pm-9:15 pm

2 stops41h 10m

Sofia

Wed 12/31

12:00 am-4:00 pm

Nonstop0h 00m

$448

ChicagoSofia

ORD Chicago O'Hare Intl - SOF Sofia

ORDSOF

Chicago O'Hare Intl

Fri 11/6

8:10 pm-8:10 pm

3 stops40h 00m

Sofia

Wed 12/31

12:00 am-4:00 pm

Nonstop0h 00m

$456
Quickest round-trip

ChicagoSofia

ORD Chicago O'Hare Intl - SOF Sofia

ORDSOF

Chicago O'Hare Intl

Wed 11/18

6:50 pm-3:25 pm

1 stop12h 35m

Sofia

Wed 12/31

12:00 am-4:00 pm

Nonstop0h 00m

$541

ChicagoSofia

ORD Chicago O'Hare Intl - SOF Sofia

ORDSOF

Chicago O'Hare Intl

Mon 11/23

11:56 am-1:15 pm

2 stops17h 19m

Sofia

Wed 12/31

12:00 am-4:00 pm

Nonstop0h 00m

$557

ChicagoSofia

ORD Chicago O'Hare Intl - SOF Sofia

ORDSOF

Chicago O'Hare Intl

Wed 1/27

11:25 am-1:15 pm

2 stops17h 50m

Sofia

Wed 2/17

6:25 am-3:20 pm

1 stop16h 55m

$710

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/28

Showing 1-10 of 19 resultsSorted by cheapest first
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Best time to book a flight from Illinois to Sofia

Have a flexible travel schedule? Discover the best time to fly to Sofia from Illinois with our price prediction graph.
Estimated round-trip price

Cheapflights Insights

Everything you need to know about your flight from Illinois to Sofia

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

Currently, February is the cheapest month in which you can book a flight from Illinois to Sofia (average of $589). Flying from Illinois to Sofia in June is currently the most expensive (average of $1,175). 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.

How much does it cost to fly round-trip from Illinois to Sofia?

Airfare is typical for this route at the moment.
Illinois to Sofia flights typically cost between $646 and $977 in November.
The cheapest round-trip price found within the last 5 days was $675 on Turkish Airlines (Nov 29-Dec 15).

How far ahead should I book a flight from Illinois to Sofia?

Booking 41 days in advance of your planned departure date is, on average, the best time to get cheap flights from Illinois to Sofia. The general trend is that the closer you book to the departure date, the more expensive your flight will be.

Related info for your journey

  • What airport do you fly into for flights to Sofia from Illinois?

    Most people fly into Sofia (SOF) if they book a flight to Sofia from Illinois. Sofia is conveniently located just 4.2 mi from Sofia’s city center.

  • How long is the flight from Illinois to Sofia?

    A quick flight from Illinois to Sofia can take about 17h 50m. United Airlines provides one of the quickest options available for as low as $710. There are 5194 mi between Illinois and Sofia. Both multi-stop and nonstop flights can be found to your destination and back.

  • What are the cheapest airlines to fly from Illinois to Sofia one-way?

    The cheapest airlines for a one-way flight from Illinois to Sofia are Lufthansa ($343), Air Serbia ($353), and Turkish Airlines ($396).

  • What are the most popular routes from Illinois to Sofia?

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

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

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

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

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

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

    Currently, February is the cheapest month in which you can book a flight from Illinois to Sofia (average of $589). Flying from Illinois to Sofia in June is currently the most expensive (average of $1,175). 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

Top 10 airlines flying from Illinois to Sofia

AirlineCheapestAverageFlexibilityOn-time
JetBlueCheapest$451Average$1,036FlexibilityNo cancel feeOn-time62%
Turkish AirlinesCheapest$526Average$745FlexibilityNo cancel feeOn-time77%
British AirwaysCheapest$573Average$846FlexibilityNo cancel feeOn-time70%
Air FranceCheapest$583Average$895FlexibilityNo cancel feeOn-time77%
LOTCheapest$586Average$989FlexibilityNo cancel feeOn-time81%
United AirlinesCheapest$610Average$1,055FlexibilityNo cancel feeOn-time69%
SWISSCheapest$612Average$985FlexibilityNo cancel feeOn-time79%
KLMCheapest$614Average$868FlexibilityNo cancel feeOn-time75%
LufthansaCheapest$616Average$1,030FlexibilityNo cancel feeOn-time76%
Air SerbiaCheapest$726Average$875FlexibilityNo cancel feeOn-timeN/A

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