How does KAYAK find such low prices on flights from Illinois to Sofia?

KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Illinois to Sofia. Visit our flight page for the latest deals!>/a>

How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Illinois to Sofia?

KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Sofia from Illinois is likely to change within 7 days, so travelers know whether to wait or book now. Visit our flight page for the latest deals!>/a>

What is the Hacker Fare option on flights from Illinois to Sofia?

Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to Sofia with an airline and back to Illinois with another airline. Visit our flight page for the latest deals!>/a>

What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Illinois to Sofia?

Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to Sofia from Illinois up to 3 days before/after your preferred dates. You can then pick the flights that suit you best. Visit our flight page for the latest deals!>/a>

$270 CHEAP FLIGHTS from Illinois to Sofia

SOF

KAYAK searches hundreds of travel sites at once for deals on flights to Sofia

...and more

Travelers love KAYAK

41,299,237 searches in the past 7 days on KAYAK

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Filter your dealsChoose cabin class, free Wi-Fi and more.

Cheapest round-trip

$540

Typical prices: $692-$832

Lufthansa

Fri 1/23Sun 2/1

STL - SOF • 2 stops

Cheapest one-way

$270

Typical prices: $356-$459

Multiple Airlines

Sat 11/15

ORD - SOF • 3 stops

Start a new search

KAYAK searches 100s of sites at once to find you the best travel deals.

We hope you love your trip to Sofia!

Flight Deals

Cheap Flights from Illinois to Sofia

Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Illinois to Sofia that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.

Discover the best prices for you by selecting your travel dates on KAYAK.

Round-trip

One-way

Last minute

Recent round-trip flight deals from Illinois to Sofia

Fri, Jan 23 - Sun, Feb 1

11:22 am - 6:20 pmSTL-SOF

22h 58m2 stops

6:10 am - 11:59 pmSOF-STL

25h 49m2 stops

$540Lufthansa

Find Deal

Thu, Feb 12 - Sun, Feb 22

9:55 am - 10:45 pmSTL-SOF

28h 50m2 stops

6:10 am - 9:00 pmSOF-STL

22h 50m2 stops

$543United Airlines

Find Deal

Mon, Apr 27 - Mon, May 11

11:25 am - 8:45 amORD-SOF

13h 20m1 stop

3:50 pm - 9:40 amSOF-ORD

25h 50m1 stop

$559Turkish Airlines

Find Deal

Sun, Feb 8 - Thu, Mar 5

9:55 pm - 1:50 pmORD-SOF

31h 55m2 stops

2:35 pm - 8:00 pmSOF-ORD

13h 25m1 stop

$560LOT

Find Deal

Thu, Nov 13 - Fri, Mar 6

11:50 am - 8:45 amORD-SOF

12h 55m1 stop

9:35 am - 6:25 pmSOF-ORD

16h 50m1 stop

$563Turkish Airlines

Find Deal

Tue, Nov 18 - Mon, Mar 16

9:55 pm - 5:50 pmORD-SOF

11h 55m1 stop

6:35 pm - 9:00 pmSOF-ORD

33h 25m1 stop

$564LOT

Find Deal

Fri, Jan 23 - Sun, Feb 1

4:05 pm - 1:40 pmSTL-SOF

37h 35m2 stops

6:10 am - 10:58 pmSOF-STL

24h 48m3 stops

$565Multiple Airlines

Find Deal

Thu, Jan 1 - Mon, Jan 26

5:20 pm - 1:55 pmORD-SOF

12h 35m1 stop

7:00 am - 2:20 pmSOF-ORD

15h 20m1 stop

$569Multiple Airlines

Find Deal

Mon, Apr 27 - Mon, May 11

1:12 pm - 11:40 amORD-SOF

14h 28m2 stops

8:00 am - 1:20 pmSOF-ORD

13h 20m1 stop

$571Austrian Airlines

Find Deal

Fri, Apr 24 - Sat, May 9

4:20 pm - 6:10 pmORD-SOF

17h 50m1 stop

8:00 am - 6:33 pmSOF-ORD

18h 33m2 stops

$580Austrian Airlines

Find Deal

Useful Info

Low season	February
High season	July
Cheapest flight	$270

Best time to beat the crowds with an average 29% drop in price.

Most popular time to fly with an average 5% increase in price.

Flight from Chicago O'Hare Airport to Sofia

How does KAYAK find such low prices on flights from Illinois to Sofia?
KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Illinois to Sofia.
How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Illinois to Sofia?
KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Sofia from Illinois is likely to change within 7 days, so travelers know whether to wait or book now.
What is the Hacker Fare option on flights from Illinois to Sofia?
Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to Sofia with an airline and back to Illinois with another airline.
What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Illinois to Sofia?
Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to Sofia from Illinois up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Sandanski

Velingrad

Everything you need to know for your flight to Sofia

Airports

Cabin class

Complete your trip

Direct Flights

Flights to other cities

Origins

Other airports

Return flight deals

Information on the airport you'll fly into in Sofia

Sofia (SOF)

Not what you’re looking for? Find thousands of other hotels, flights, car rentals and package deals with KAYAK.

SOF

$270 Find Cheap Flights from Illinois to Sofia

KAYAK searches hundreds of travel sites at once for deals on flights to Sofia

Everything you should know

Cheap Flights from Illinois to Sofia

Recent round-trip flight deals from Illinois to Sofia

Recent one-way flight deals from Illinois to Sofia

Recent last minute flight deals from Illinois to Sofia

Good to know

FAQs for booking flights from Illinois to Sofia

How does KAYAK find such low prices on flights from Illinois to Sofia?

KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Illinois to Sofia.

How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Illinois to Sofia?

KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Sofia from Illinois is likely to change within 7 days, so travelers know whether to wait or book now.

What is the Hacker Fare option on flights from Illinois to Sofia?

Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to Sofia with an airline and back to Illinois with another airline.

What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Illinois to Sofia?

Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to Sofia from Illinois up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Traveling to a place near Sofia?

Everything you need to know for your flight to Sofia

Information on the airport you'll fly into in Sofia

Cabin class types available on flights to Illinois

Complete your trip to Sofia with a hotel stay or car rental

Find direct flights for Sofia

Flights to other popular destinations

Flights from domestic origins to Sofia

Choose which airport to fly into in Sofia

Find deals for your return flight