What is the cheapest airline that flies from Illinois to Sofia?

Turkish Airlines is the most popular carrier operating from Illinois to Sofia

What airlines fly to Sofia?

Turkish Airlines, Lufthansa and LOT are the top three most popular airlines that fly to Sofia from Illinois according to our data. Turkish Airlines is the first choice among our users, with 33% of people opting to fly with this airline when traveling to Sofia. Keep in mind that there are 12 different airlines that fly to Sofia on a routine basis, so you have a few additional options to choose from.

When did momondo last update prices for flights from Illinois to Sofia Airport?

Prices for flights from Illinois to Sofia Airport refresh daily.

How many operators does momondo search for flights from Illinois to Sofia Airport?

As of August 2026, there are 13 operators available to choose from for flights from Illinois to Sofia Airport.

How old do you have to be to fly from Illinois to Sofia Airport?

Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Illinois to Sofia Airport.

What documentation or ID do you need to fly to Sofia Airport?

The required travel and health documents for your Sofia Airport trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at Sofia Airport. We recommend that you seek guidance from your airline or a reliable third party such as IATA.

$306 Cheap Flights from Illinois to Sofia in 2026

Discover deals from 900+ travel sites with momondo.

Find the cheapest flights from Illinois to Sofia

Round-trip

One-way

Last minute

Cheap round-trip flights

Enter your travel dates to find the best prices.

9:50 pm - 1:50 pmORD Chicago O'Hare Intl-SOF Sofia

32h 00m1 stop Warsaw Frederic Chopin

2:35 pm - 7:55 pmSOF Sofia-ORD Chicago O'Hare Intl

13h 20m1 stop Warsaw Frederic Chopin

$733LOT

Tue, Nov 3 - Sun, Nov 15

9:50 pm - 5:55 pmORD Chicago O'Hare Intl-SOF Sofia

12h 05m1 stop Warsaw Frederic Chopin

2:35 pm - 7:55 pmSOF Sofia-ORD Chicago O'Hare Intl

13h 20m1 stop Warsaw Frederic Chopin

$733LOT

Fri, Nov 13 - Fri, Nov 27

8:10 pm - 8:45 amORD Chicago O'Hare Intl-SOF Sofia

28h 35m1 stop Istanbul

4:00 pm - 10:00 amSOF Sofia-ORD Chicago O'Hare Intl

26h 00m1 stop Istanbul

$733Turkish Airlines

Sun, Sep 13 - Mon, Nov 9

10:37 am - 1:15 pmORD Chicago O'Hare Intl-SOF Sofia

18h 38m2 stops Montreal Pierre Elliott Trudeau Intl Munich Franz Josef Strauss

11:50 am - 9:59 pmSOF Sofia-ORD Chicago O'Hare Intl

18h 09m2 stops Frankfurt am Main Toronto Pearson Intl

$736Air Canada

Wed, Nov 11 - Thu, Apr 1

1:55 pm - 1:15 pmORD Chicago O'Hare Intl-SOF Sofia

15h 20m2 stops Charlotte Douglas Munich Franz Josef Strauss

2:05 pm - 9:59 pmSOF Sofia-ORD Chicago O'Hare Intl

15h 54m2 stops Frankfurt am Main Toronto Pearson Intl

$737United Airlines

Wed, Nov 11 - Thu, Apr 1

11:45 am - 1:15 pmORD Chicago O'Hare Intl-SOF Sofia

17h 30m2 stops Newark Munich Franz Josef Strauss

6:25 am - 9:59 pmSOF Sofia-ORD Chicago O'Hare Intl

23h 34m2 stops Frankfurt am Main Toronto Pearson Intl

$738Multiple Airlines

Tue, Jan 12 - Tue, Jan 26

9:15 pm - 8:55 pmORD Chicago O'Hare Intl-SOF Sofia

16h 40m1 stop Istanbul

11:55 am - 7:20 pmSOF Sofia-ORD Chicago O'Hare Intl

15h 25m1 stop Istanbul

$739Turkish Airlines

Sun, Oct 25 - Sun, Nov 1

6:00 pm - 1:15 pmORD Chicago O'Hare Intl-SOF Sofia

11h 15m1 stop Munich Franz Josef Strauss

6:25 am - 3:20 pmSOF Sofia-ORD Chicago O'Hare Intl

16h 55m1 stop Frankfurt am Main

$775United Airlines

Wed, Jan 27 - Sun, Jan 31

8:40 am - 6:05 pmSTL Lambert-St Louis-SOF Sofia

25h 25m2 stops Washington, D.C. Dulles Intl Frankfurt am Main

6:20 am - 6:41 pmSOF Sofia-STL Lambert-St Louis

20h 21m2 stops Frankfurt am Main Montreal Pierre Elliott Trudeau Intl

$889Multiple Airlines

Wed, Sep 9 - Wed, Sep 16

9:40 am - 1:25 pmSTL Lambert-St Louis-SOF Sofia

19h 45m3 stops Chicago O'Hare Intl Toronto Pearson Intl Frankfurt am Main

2:10 pm - 10:42 amSOF Sofia-STL Lambert-St Louis

28h 32m3 stops Frankfurt am Main Toronto Pearson Intl Chicago O'Hare Intl

$1,101Air Canada

Wed, Dec 16 - Fri, Dec 25

Cheap last minute flights

Enter your travel dates to find the best prices.

11:25 am - 3:00 pmORD Chicago O'Hare Intl-SOF Sofia

19h 35m1 stop Istanbul

9:35 am - 9:40 amSOF Sofia-ORD Chicago O'Hare Intl

32h 05m1 stop Istanbul

$795Turkish Airlines

Wed, Aug 19 - Sat, Oct 10

8:10 pm - 3:00 pmORD Chicago O'Hare Intl-SOF Sofia

34h 50m1 stop Istanbul

3:50 pm - 9:40 amSOF Sofia-ORD Chicago O'Hare Intl

25h 50m1 stop Istanbul

$841Turkish Airlines

Thu, Aug 20 - Wed, Sep 30

4:40 pm - 3:30 pmORD Chicago O'Hare Intl-SOF Sofia

14h 50m1 stop Belgrade Nikola Tesla

4:00 pm - 2:30 pmSOF Sofia-ORD Chicago O'Hare Intl

30h 30m1 stop Belgrade Nikola Tesla

$870Air Serbia

Wed, Aug 19 - Sun, Sep 13

3:35 pm - 12:10 pmORD Chicago O'Hare Intl-SOF Sofia

12h 35m1 stop Munich Franz Josef Strauss

2:10 pm - 7:55 pmSOF Sofia-ORD Chicago O'Hare Intl

13h 45m1 stop Frankfurt am Main

$879Lufthansa

Wed, Aug 19 - Thu, Sep 3

10:30 pm - 10:50 pmORD Chicago O'Hare Intl-SOF Sofia

16h 20m1 stop Frankfurt am Main

12:55 pm - 6:15 pmSOF Sofia-ORD Chicago O'Hare Intl

13h 20m1 stop Munich Franz Josef Strauss

$894Lufthansa

Wed, Aug 19 - Thu, Sep 3

5:10 pm - 1:55 amORD Chicago O'Hare Intl-SOF Sofia

24h 45m2 stops Krakow J. Paul II Balice Warsaw Frederic Chopin

6:45 pm - 7:50 pmSOF Sofia-ORD Chicago O'Hare Intl

33h 05m1 stop Warsaw Frederic Chopin

$929LOT

Wed, Aug 19 - Sat, Oct 10

2:20 pm - 10:20 amORD Chicago O'Hare Intl-SOF Sofia

12h 00m1 stop Zurich

12:55 pm - 6:15 pmSOF Sofia-ORD Chicago O'Hare Intl

13h 20m1 stop Munich Franz Josef Strauss

$933Multiple Airlines

Wed, Aug 19 - Thu, Sep 3

11:05 am - 6:40 pmORD Chicago O'Hare Intl-SOF Sofia

23h 35m2 stops Montreal Pierre Elliott Trudeau Intl Munich Franz Josef Strauss

3:40 pm - 12:35 pmSOF Sofia-ORD Chicago O'Hare Intl

28h 55m1 stop Zurich

$959Multiple Airlines

Sun, Aug 16 - Mon, Sep 7

7:05 pm - 2:55 pmORD Chicago O'Hare Intl-SOF Sofia

11h 50m1 stop Zurich

3:40 pm - 12:35 pmSOF Sofia-ORD Chicago O'Hare Intl

28h 55m1 stop Zurich

$969SWISS

Sun, Aug 16 - Mon, Sep 7

6:00 pm - 11:15 pmORD Chicago O'Hare Intl-SOF Sofia

21h 15m1 stop Munich Franz Josef Strauss

6:30 am - 2:55 pmSOF Sofia-ORD Chicago O'Hare Intl

16h 25m2 stops Frankfurt am Main Montreal Pierre Elliott Trudeau Intl

$986United Airlines

Wed, Aug 19 - Thu, Sep 3

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LOT flights from Illinois to Sofia

Our best LOT deals on Illinois to Sofia flight tickets

LOT

Sep 7

ORD9:50 pmChicago O'Hare Intl

12h 10m

1 stop

SOF6:00 pmSofia

Dec 11

SOF2:35 pmSofia

13h 20m

1 stop

ORD7:55 pmChicago O'Hare Intl

$734

LOT

Oct 31

ORD10:50 pmChicago O'Hare Intl

12h 05m

1 stop

SOF5:55 pmSofia

Nov 18

SOF6:40 pmSofia

33h 15m

1 stop

ORD7:55 pmChicago O'Hare Intl

$735

LOT

Oct 4

ORD9:50 pmChicago O'Hare Intl

12h 10m

1 stop

SOF6:00 pmSofia

Feb 26

SOF2:35 pmSofia

13h 20m

1 stop

ORD7:55 pmChicago O'Hare Intl

$736

Lufthansa flights from Illinois to Sofia

Our best Lufthansa deals on Illinois to Sofia flight tickets

Lufthansa

Jan 27

ORD9:50 pmChicago O'Hare Intl

12h 30m

1 stop

SOF6:20 pmSofia

Jan 31

SOF6:25 amSofia

14h 45m

1 stop

ORD1:10 pmChicago O'Hare Intl

$752

Lufthansa

Jan 15

ORD9:50 pmChicago O'Hare Intl

12h 30m

1 stop

SOF6:20 pmSofia

Jan 18

SOF7:05 pmSofia

31h 20m

1 stop

ORD6:25 pmChicago O'Hare Intl

$763

Lufthansa

Jan 8

ORD4:20 pmChicago O'Hare Intl

13h 05m

1 stop

SOF1:25 pmSofia

Jan 22

SOF6:25 amSofia

14h 45m

1 stop

ORD1:10 pmChicago O'Hare Intl

$764

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

ChicagoSofia

ORD Chicago O'Hare Intl - SOF Sofia

ORDSOF

Chicago O'Hare Intl

Tue 11/3

9:50 pm-1:50 pm

1 stop32h 00m

Sofia

Sun 11/15

2:35 pm-7:55 pm

1 stop13h 20m

$733

Quickest round-trip

ChicagoSofia

ORD Chicago O'Hare Intl - SOF Sofia

ORDSOF

Chicago O'Hare Intl

Fri 11/13

9:50 pm-5:55 pm

1 stop12h 05m

Sofia

Fri 11/27

2:35 pm-7:55 pm

1 stop13h 20m

$733

ChicagoSofia

ORD Chicago O'Hare Intl - SOF Sofia

ORDSOF

Chicago O'Hare Intl

Sun 9/13

8:10 pm-8:45 am

1 stop28h 35m

Sofia

Mon 11/9

4:00 pm-10:00 am

1 stop26h 00m

$733

ChicagoSofia

ORD Chicago O'Hare Intl - SOF Sofia

ORDSOF

Chicago O'Hare Intl

Wed 11/11

10:37 am-1:15 pm

2 stops18h 38m

Sofia

Thu 4/1

11:50 am-9:59 pm

2 stops18h 09m

$736

ChicagoSofia

ORD Chicago O'Hare Intl - SOF Sofia

ORDSOF

Chicago O'Hare Intl

Wed 11/11

1:55 pm-1:15 pm

2 stops15h 20m

Sofia

Thu 4/1

2:05 pm-9:59 pm

2 stops15h 54m

$737

ChicagoSofia

ORD Chicago O'Hare Intl - SOF Sofia

ORDSOF

Chicago O'Hare Intl

Tue 1/12

11:45 am-1:15 pm

2 stops17h 30m

Sofia

Tue 1/26

6:25 am-9:59 pm

2 stops23h 34m

$738

ChicagoSofia

ORD Chicago O'Hare Intl - SOF Sofia

ORDSOF

Chicago O'Hare Intl

Sun 10/25

9:15 pm-8:55 pm

1 stop16h 40m

Sofia

Sun 11/1

11:55 am-7:20 pm

1 stop15h 25m

$739

ChicagoSofia

ORD Chicago O'Hare Intl - SOF Sofia

ORDSOF

Chicago O'Hare Intl

Wed 1/27

6:00 pm-1:15 pm

1 stop11h 15m

Sofia

Sun 1/31

6:25 am-3:20 pm

1 stop16h 55m

$775

St. LouisSofia

STL Lambert-St Louis - SOF Sofia

STLSOF

Lambert-St Louis

Wed 9/9

8:40 am-6:05 pm

2 stops25h 25m

Sofia

Wed 9/16

6:20 am-6:41 pm

2 stops20h 21m

$889

St. LouisSofia

STL Lambert-St Louis - SOF Sofia

STLSOF

Lambert-St Louis

Wed 12/16

9:40 am-1:25 pm

3 stops19h 45m

Sofia

Fri 12/25

2:10 pm-10:42 am

3 stops28h 32m

$1,101

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first

How to get the cheapest flight ticket from Illinois to Sofia

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

Prices

Airlines

What is the cheapest month to fly to Sofia?

The cheapest month to fly to Sofia from Illinois is in February. Flight prices, which tend to average around $593, are often lower during this time because this is during the off-season. If you aren’t able to travel during the month of February, then book flights to Sofia from Illinois during January instead. Flights to Sofia in January, while not as cheap as those in February, still average around $608.

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

You are more likely to see cheaper flights to Sofia from Illinois when booking weeks ahead of your departure date. In general, you can expect to find flights to Sofia for around $788 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Sofia from Illinois for as low as $736 on momondo.

Can stopping save me money on Illinois to Sofia flights?

You could potentially save up to 16% on your flight if you consider stops on a Illinois to Sofia flight.

Cheap Illinois to Sofia flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Illinois to Sofia

Fastest flight time	12h 30m
Direct flights	None

The fastest flight from Illinois to Sofia takes 12h 30m

There are no direct flights from Illinois to Sofia. There are no popular flight routes from Illinois to Sofia.

Search flight deals

Frequently asked questions about flying from Illinois to Sofia

When did momondo last update prices for flights from Illinois to Sofia Airport?
Prices for flights from Illinois to Sofia Airport refresh daily.
How many operators does momondo search for flights from Illinois to Sofia Airport?
As of August 2026, there are 13 operators available to choose from for flights from Illinois to Sofia Airport.
How old do you have to be to fly from Illinois to Sofia Airport?
Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Illinois to Sofia Airport.
What documentation or ID do you need to fly to Sofia Airport?
The required travel and health documents for your Sofia Airport trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at Sofia Airport. We recommend that you seek guidance from your airline or a reliable third party such as IATA.

Best airlines flying from Illinois to Sofia

Compare and see reviews for airlines that fly from Illinois to Sofia with momondo

Airline	Rating	Free Cancellation	Price
Turkish Airlines	PriceFrom $524	Free Cancellation	Rating 7.4 4,477 reviews	Search Turkish Airlines flights
LOT	PriceFrom $580	Free Cancellation	Rating 7.5 1,213 reviews	Search LOT flights
Air France	PriceFrom $585	Free Cancellation	Rating 7.5 1,643 reviews	Search Air France flights
SWISS	PriceFrom $594	Free Cancellation	Rating 7.5 2,035 reviews	Search SWISS flights
Lufthansa	PriceFrom $607	Free Cancellation	Rating 6.8 8,195 reviews	Search Lufthansa flights
United Airlines	PriceFrom $608	Free Cancellation	Rating 7.4 10,107 reviews	Search United Airlines flights
British Airways	PriceFrom $609	Free Cancellation	Rating 6.7 8,168 reviews	Search British Airways flights
KLM	PriceFrom $614	Free Cancellation	Rating 7.8 1,559 reviews	Search KLM flights
Austrian Airlines	PriceFrom $701	Free Cancellation	Rating 7.6 947 reviews	Search Austrian Airlines flights
Air Serbia	PriceFrom $703	Free Cancellation	Rating 6.2 234 reviews	Search Air Serbia flights

Bansko

Borovets

Velingrad

Sandanski

Why use momondo?

Why should I use momondo to find a flight deal from Illinois to Sofia?

momondo compares prices from hundreds of airlines and agents so you can find and book the best deal on flights from Illinois to Sofia. Millions of users trust and use momondo every year so you are in good hands.

Can I find flights from Illinois to Sofia with flexible booking policies on momondo?

momondo does allow users to show only those flights to Sofia from Illinois which offer a flexible booking policy as well as other useful filters and features.

How can momondo help me find flights from Illinois to Sofia?

momondo helps you find the best flight between Illinois and Sofia by providing filters to narrow your choice of flights to those matching your criteria. You can select flights based on numerous factors such as price, departure and landing times, airport and airline.

I’m not ready to book a flight from Illinois to Sofia right now. Can momondo alert me if prices change?

Of course. momondo tracks the price of Illinois to Sofia flights. All you need is a valid email address and we will do the rest; it is that quick and easy.