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>

$330 CHEAP FLIGHTS from Illinois to Sofia

SOF

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

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Cheap Flights from Illinois to Sofia

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

Tue, Aug 4 - Mon, Aug 24

8:43 am - 11:15 pm

STL

SOF

30h 32m

2 stops

7:00 pm - 1:25 pm

SOF

STL

26h 25m

1 stop

$796Lufthansa

Tue, Aug 4 - Mon, Aug 24

3:30 pm - 6:00 pm

STL

SOF

18h 30m

1 stop

7:00 pm - 1:25 pm

SOF

STL

26h 25m

1 stop

$804Lufthansa

Sun, Sep 20 - Mon, Oct 5

8:10 pm - 3:00 pm

ORD

SOF

34h 50m

1 stop

9:35 am - 9:40 am

SOF

ORD

32h 05m

1 stop

$821Turkish Airlines

Fri, Aug 28 - Sat, Sep 12

9:39 am - 3:30 pm

ORD

SOF

21h 51m

2 stops

4:00 pm - 9:15 pm

SOF

ORD

13h 15m

1 stop

$824Multiple Airlines

Sat, Oct 31 - Sat, Nov 14

8:46 pm - 4:20 pm

ORD

SOF

36h 34m

2 stops

12:05 pm - 7:16 am

SOF

ORD

27h 11m

2 stops

$826British Airways

Fri, Sep 11 - Sat, Sep 19

11:25 am - 3:00 pm

ORD

SOF

19h 35m

1 stop

3:50 pm - 9:40 am

SOF

ORD

25h 50m

1 stop

$827Turkish Airlines

Tue, Sep 8 - Mon, Oct 12

9:50 am - 12:10 pm

ORD

SOF

18h 20m

2 stops

7:25 pm - 6:15 pm

SOF

ORD

30h 50m

1 stop

$828Multiple Airlines

Sat, Oct 31 - Sun, Jan 31

8:46 pm - 4:20 pm

ORD

SOF

36h 34m

2 stops

2:30 pm - 5:42 pm

SOF

ORD

35h 12m

2 stops

$832British Airways

Tue, Aug 4 - Mon, Aug 24

8:43 am - 12:10 pm

STL

SOF

19h 27m

2 stops

6:10 am - 7:31 pm

SOF

STL

21h 21m

2 stops

$832United Airlines

Wed, Sep 9 - Wed, Sep 16

7:01 am - 12:10 pm

STL

SOF

21h 09m

2 stops

6:20 am - 1:25 pm

SOF

STL

15h 05m

1 stop

$838United Airlines

Useful Info

Low season	November
High season	July
Cheapest flight	$330

Best time to beat the crowds with an average 12% drop in price.

Most popular time to fly with an average 9% 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.

Velingrad

Sandanski

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)

SOF

$330 Find Cheap Flights from Illinois to Sofia

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

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