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

British Airways, Lufthansa, and United Airlines are the most popular carriers 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 34% 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 October 2026, there are 12 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.

$297 Cheap Flights from Illinois to Sofia in 2026/27

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.

8:10 pm - 1:10 amORD Chicago O'Hare Intl-SOF Sofia

21h 00m2 stops Lisbon Humberto Delgado Madrid Barajas

5:25 pm - 3:30 pmSOF Sofia-ORD Chicago O'Hare Intl

30h 05m2 stops Madrid Barajas Lisbon Humberto Delgado

$706Multiple Airlines

Fri, Nov 6 - Tue, Nov 17

10:05 am - 12:10 pmORD Chicago O'Hare Intl-SOF Sofia

18h 05m2 stops Toronto Pearson Intl Munich Franz Josef Strauss

6:10 am - 12:55 pmSOF Sofia-ORD Chicago O'Hare Intl

14h 45m2 stops Munich Franz Josef Strauss Frankfurt am Main

$706Multiple Airlines

Wed, Mar 31 - Wed, Apr 14

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

28h 35m1 stop Istanbul

4:00 pm - 6:20 pmSOF Sofia-ORD Chicago O'Hare Intl

34h 20m1 stop Istanbul

$711Turkish Airlines

Mon, Oct 12 - Tue, Nov 10

11:45 am - 8:50 pmORD Chicago O'Hare Intl-SOF Sofia

25h 05m1 stop Istanbul

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

26h 00m1 stop Istanbul

$711Turkish Airlines

Thu, Dec 31 - Thu, Jan 14

9:50 pm - 11:00 pmORD Chicago O'Hare Intl-SOF Sofia

17h 10m2 stops Munich Franz Josef Strauss Frankfurt am Main

6:25 am - 1:10 pmSOF Sofia-ORD Chicago O'Hare Intl

14h 45m1 stop Frankfurt am Main

$712Lufthansa

Tue, Dec 29 - Tue, Jan 12

9:50 pm - 10:55 pmORD Chicago O'Hare Intl-SOF Sofia

17h 05m1 stop Munich Franz Josef Strauss

7:05 pm - 6:25 pmSOF Sofia-ORD Chicago O'Hare Intl

31h 20m1 stop Munich Franz Josef Strauss

$713Lufthansa

Mon, Jan 4 - Mon, Jan 18

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

16h 05m2 stops Newark Munich Franz Josef Strauss

6:25 am - 6:45 pmSOF Sofia-ORD Chicago O'Hare Intl

19h 20m2 stops Frankfurt am Main Montreal Pierre Elliott Trudeau Intl

$714United Airlines

Tue, Mar 2 - Tue, Mar 16

1:30 pm - 1:15 pmORD Chicago O'Hare Intl-SOF Sofia

15h 45m2 stops Washington, D.C. Dulles Intl Munich Franz Josef Strauss

6:25 am - 5:43 pmSOF Sofia-ORD Chicago O'Hare Intl

19h 18m2 stops Frankfurt am Main Toronto Pearson Intl

$719United Airlines

Tue, Mar 2 - Wed, Mar 10

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

32h 00m1 stop Warsaw Frederic Chopin

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

33h 05m1 stop Warsaw Frederic Chopin

$726LOT

Sun, Mar 28 - Sun, Apr 11

10:55 pm - 2:00 amORD Chicago O'Hare Intl-SOF Sofia

19h 05m1 stop Warsaw Frederic Chopin

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

33h 05m1 stop Warsaw Frederic Chopin

$753LOT

Sat, Mar 27 - Sun, Apr 11

Cheap last minute flights

Enter your travel dates to find the best prices.

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

28h 35m1 stop Istanbul

9:10 pm - 6:15 pmSOF Sofia-ORD Chicago O'Hare Intl

29h 05m1 stop Istanbul

$817Turkish Airlines

Wed, Oct 7 - Sun, Oct 18

8:10 pm - 8:20 pmORD Chicago O'Hare Intl-SOF Sofia

16h 10m1 stop Istanbul

11:55 am - 10:00 amSOF Sofia-ORD Chicago O'Hare Intl

30h 05m1 stop Istanbul

$828Turkish Airlines

Sun, Oct 4 - Fri, Feb 26

11:20 pm - 3:00 amORD Chicago O'Hare Intl-SOF Sofia

19h 40m1 stop Belgrade Nikola Tesla

4:00 pm - 2:45 pmSOF Sofia-ORD Chicago O'Hare Intl

30h 45m1 stop Belgrade Nikola Tesla

$873Air Serbia

Sat, Oct 3 - Thu, Feb 25

11:20 pm - 3:00 amORD Chicago O'Hare Intl-SOF Sofia

19h 40m1 stop Belgrade Nikola Tesla

4:00 pm - 2:45 pmSOF Sofia-ORD Chicago O'Hare Intl

30h 45m1 stop Belgrade Nikola Tesla

$875Air Serbia

Sat, Oct 3 - Thu, Feb 25

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

12h 35m1 stop Munich Franz Josef Strauss

6:25 am - 1:10 pmSOF Sofia-ORD Chicago O'Hare Intl

14h 45m1 stop Frankfurt am Main

$891Lufthansa

Sun, Oct 4 - Fri, Feb 26

9:40 pm - 6:40 pmORD Chicago O'Hare Intl-SOF Sofia

13h 00m1 stop Munich Franz Josef Strauss

6:25 am - 1:10 pmSOF Sofia-ORD Chicago O'Hare Intl

14h 45m1 stop Frankfurt am Main

$905Lufthansa

Sun, Oct 4 - Fri, Feb 26

9:40 pm - 6:40 pmORD Chicago O'Hare Intl-SOF Sofia

13h 00m1 stop Munich Franz Josef Strauss

6:25 am - 2:52 pmSOF Sofia-ORD Chicago O'Hare Intl

16h 27m2 stops Frankfurt am Main Montreal Pierre Elliott Trudeau Intl

$974Multiple Airlines

Sun, Oct 4 - Fri, Feb 26

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

11h 50m1 stop Zurich

6:25 am - 2:52 pmSOF Sofia-ORD Chicago O'Hare Intl

16h 27m2 stops Frankfurt am Main Montreal Pierre Elliott Trudeau Intl

$977Multiple Airlines

Sun, Oct 4 - Fri, Feb 26

4:20 pm - 11:40 amORD Chicago O'Hare Intl-SOF Sofia

11h 20m1 stop Vienna Intl

7:55 am - 5:03 pmSOF Sofia-ORD Chicago O'Hare Intl

17h 08m2 stops Vienna Intl Washington, D.C. Dulles Intl

$981Austrian Airlines

Sun, Oct 4 - Fri, Feb 26

4:20 pm - 6:10 pmORD Chicago O'Hare Intl-SOF Sofia

17h 50m1 stop Vienna Intl

6:55 pm - 1:20 pmSOF Sofia-ORD Chicago O'Hare Intl

26h 25m1 stop Vienna Intl

$1,029Austrian Airlines

Thu, Oct 8 - Mon, Oct 12

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Turkish Airlines flights from Illinois to Sofia

Our best Turkish Airlines deals on Illinois to Sofia flight tickets

Turkish Airlines

Oct 30

ORD12:45 pmChicago O'Hare Intl

25h 05m

1 stop

SOF8:50 pmSofia

Nov 6

SOF9:40 pmSofia

21h 20m

1 stop

ORD11:00 amChicago O'Hare Intl

$711

Turkish Airlines

Oct 12

ORD8:10 pmChicago O'Hare Intl

16h 10m

1 stop

SOF8:20 pmSofia

Oct 22

SOF9:10 pmSofia

20h 30m

1 stop

ORD9:40 amChicago O'Hare Intl

$723

Turkish Airlines

Oct 30

ORD9:15 pmChicago O'Hare Intl

28h 25m

1 stop

SOF8:40 amSofia

Nov 13

SOF9:30 amSofia

16h 50m

1 stop

ORD6:20 pmChicago O'Hare Intl

$726

Air Serbia flights from Illinois to Sofia

Our best Air Serbia deals on Illinois to Sofia flight tickets

Air Serbia

Oct 3

ORD11:20 pmChicago O'Hare Intl

19h 40m

1 stop

SOF3:00 amSofia

Feb 25

SOF4:00 pmSofia

30h 45m

1 stop

ORD2:45 pmChicago O'Hare Intl

$873

Air Serbia

Oct 3

ORD11:20 pmChicago O'Hare Intl

19h 40m

1 stop

SOF3:00 amSofia

Feb 25

SOF4:00 pmSofia

30h 45m

1 stop

ORD2:45 pmChicago O'Hare Intl

$875

Air Serbia

Oct 14

ORD4:40 pmChicago O'Hare Intl

26h 20m

1 stop

SOF3:00 amSofia

Oct 17

SOF4:00 pmSofia

13h 15m

1 stop

ORD9:15 pmChicago O'Hare Intl

$911

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

ChicagoSofia

ORD Chicago O'Hare Intl - SOF Sofia

ORDSOF

Chicago O'Hare Intl

Fri 11/6

8:10 pm-1:10 am

2 stops21h 00m

Sofia

Tue 11/17

5:25 pm-3:30 pm

2 stops30h 05m

$706

ChicagoSofia

ORD Chicago O'Hare Intl - SOF Sofia

ORDSOF

Chicago O'Hare Intl

Wed 3/31

10:05 am-12:10 pm

2 stops18h 05m

Sofia

Wed 4/14

6:10 am-12:55 pm

2 stops14h 45m

$706

ChicagoSofia

ORD Chicago O'Hare Intl - SOF Sofia

ORDSOF

Chicago O'Hare Intl

Mon 10/12

8:10 pm-8:45 am

1 stop28h 35m

Sofia

Tue 11/10

4:00 pm-6:20 pm

1 stop34h 20m

$711

ChicagoSofia

ORD Chicago O'Hare Intl - SOF Sofia

ORDSOF

Chicago O'Hare Intl

Thu 12/31

11:45 am-8:50 pm

1 stop25h 05m

Sofia

Thu 1/14

4:00 pm-10:00 am

1 stop26h 00m

$711

Quickest round-trip

ChicagoSofia

ORD Chicago O'Hare Intl - SOF Sofia

ORDSOF

Chicago O'Hare Intl

Tue 12/29

9:50 pm-11:00 pm

2 stops17h 10m

Sofia

Tue 1/12

6:25 am-1:10 pm

1 stop14h 45m

$712

ChicagoSofia

ORD Chicago O'Hare Intl - SOF Sofia

ORDSOF

Chicago O'Hare Intl

Mon 1/4

9:50 pm-10:55 pm

1 stop17h 05m

Sofia

Mon 1/18

7:05 pm-6:25 pm

1 stop31h 20m

$713

ChicagoSofia

ORD Chicago O'Hare Intl - SOF Sofia

ORDSOF

Chicago O'Hare Intl

Tue 3/2

1:10 pm-1:15 pm

2 stops16h 05m

Sofia

Tue 3/16

6:25 am-6:45 pm

2 stops19h 20m

$714

ChicagoSofia

ORD Chicago O'Hare Intl - SOF Sofia

ORDSOF

Chicago O'Hare Intl

Tue 3/2

1:30 pm-1:15 pm

2 stops15h 45m

Sofia

Wed 3/10

6:25 am-5:43 pm

2 stops19h 18m

$719

ChicagoSofia

ORD Chicago O'Hare Intl - SOF Sofia

ORDSOF

Chicago O'Hare Intl

Sun 3/28

9:50 pm-1:50 pm

1 stop32h 00m

Sofia

Sun 4/11

6:45 pm-7:50 pm

1 stop33h 05m

$726

ChicagoSofia

ORD Chicago O'Hare Intl - SOF Sofia

ORDSOF

Chicago O'Hare Intl

Sat 3/27

10:55 pm-2:00 am

1 stop19h 05m

Sofia

Sun 4/11

6:45 pm-7:50 pm

1 stop33h 05m

$753

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 $586, 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 $616.

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 $808 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 $747 on momondo.

Can stopping save me money on Illinois to Sofia flights?

You could potentially save up to 10% 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

Best Price Found	$297
Fastest flight time	11h 15m
Direct flights	None

The best one-way flight to Sofia from Illinois in the past 72 hours is $297. The best round-trip flight deal from Illinois to Sofia found on momondo in the last 72 hours is $706.

The fastest flight from Illinois to Sofia takes 11h 15m

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 October 2026, there are 12 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
JetBlue	PriceFrom $451	Free Cancellation	Rating 7.1 3,043 reviews	Search JetBlue flights
Turkish Airlines	PriceFrom $526	Free Cancellation	Rating 7.4 4,455 reviews	Search Turkish Airlines flights
SWISS	PriceFrom $565	Free Cancellation	Rating 7.5 2,090 reviews	Search SWISS flights
British Airways	PriceFrom $580	Free Cancellation	Rating 6.7 8,243 reviews	Search British Airways flights
United Airlines	PriceFrom $583	Free Cancellation	Rating 7.4 10,276 reviews	Search United Airlines flights
Air France	PriceFrom $585	Free Cancellation	Rating 7.5 1,649 reviews	Search Air France flights
LOT	PriceFrom $586	Free Cancellation	Rating 7.6 1,197 reviews	Search LOT flights
Lufthansa	PriceFrom $610	Free Cancellation	Rating 6.8 8,255 reviews	Search Lufthansa flights
KLM	PriceFrom $613	Free Cancellation	Rating 7.8 1,578 reviews	Search KLM flights
Air Serbia	PriceFrom $726	Free Cancellation	Rating 6.1 237 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.