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

British Airways and Lufthansa are the most popular carriers operating from Illinois to Sofia

What airlines fly to Sofia?

Lufthansa, Turkish Airlines and LOT are the top three most popular airlines that fly to Sofia from Illinois according to our data. Lufthansa is the first choice among our users, with 32% 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 March 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.

$293 Cheap Flights from Illinois to Sofia in 2026

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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 - 8:15 pm

ORD

SOF

16h 05m

1 stop

9:05 pm - 6:15 pm

SOF

ORD

29h 10m

1 stop

$580Turkish Airlines

Sun, Aug 2 - Tue, Sep 8

8:10 pm - 8:15 pm

ORD

SOF

16h 05m

1 stop

9:05 pm - 9:40 am

SOF

ORD

20h 35m

1 stop

$582Turkish Airlines

Mon, Apr 27 - Mon, May 11

2:15 pm - 6:40 pm

STL

SOF

20h 25m

2 stops

6:10 am - 8:25 pm

SOF

STL

22h 15m

2 stops

$727Air Canada

Tue, May 5 - Tue, May 12

5:59 pm - 6:40 pm

STL

SOF

16h 41m

2 stops

6:20 am - 1:25 pm

SOF

STL

15h 05m

1 stop

$753United Airlines

Wed, May 6 - Wed, May 13

11:37 am - 12:10 pm

STL

SOF

16h 33m

2 stops

6:10 am - 8:25 pm

SOF

STL

22h 15m

2 stops

$756United Airlines

Wed, Apr 29 - Tue, May 5

12:23 pm - 2:00 pm

STL

SOF

17h 37m

2 stops

7:00 am - 8:37 pm

SOF

STL

21h 37m

2 stops

$761Multiple Airlines

Wed, May 6 - Tue, Jan 12

2:15 pm - 6:40 pm

STL

SOF

20h 25m

2 stops

6:40 pm - 1:25 pm

SOF

STL

26h 45m

1 stop

$766Multiple Airlines

Tue, May 5 - Tue, May 12

12:10 pm - 6:40 pm

STL

SOF

22h 30m

2 stops

6:10 am - 6:41 pm

SOF

STL

20h 31m

2 stops

$789Air Canada

Tue, Sep 1 - Tue, Sep 15

1:24 pm - 2:00 pm

MDW

SOF

16h 36m

2 stops

7:00 am - 6:36 pm

SOF

MDW

19h 36m

2 stops

$863KLM

Sun, Apr 19 - Tue, May 5

1:24 pm - 2:00 pm

MDW

SOF

16h 36m

2 stops

7:00 am - 4:26 pm

SOF

MDW

17h 26m

2 stops

$917KLM

Sun, Apr 19 - Tue, May 5

KLM flights from Illinois to Sofia

Our best KLM deals on Illinois to Sofia flight tickets

KLM

Apr 19

MDW1:24 pmChicago Midway

16h 36m

2 stops

SOF2:00 pmSofia

May 5

SOF7:00 amSofia

19h 36m

2 stops

MDW6:36 pmChicago Midway

$863

KLM

Apr 19

MDW1:24 pmChicago Midway

16h 36m

2 stops

SOF2:00 pmSofia

May 5

SOF7:00 amSofia

18h 58m

2 stops

MDW5:58 pmChicago Midway

$944

KLM

Apr 13

MDW1:24 pmChicago Midway

16h 36m

2 stops

SOF2:00 pmSofia

Apr 25

SOF7:00 amSofia

17h 29m

2 stops

MDW4:29 pmChicago Midway

$951

Turkish Airlines flights from Illinois to Sofia

Our best Turkish Airlines deals on Illinois to Sofia flight tickets

Turkish Airlines

Aug 2

ORD8:10 pmChicago O'Hare Intl

16h 05m

1 stop

SOF8:15 pmSofia

Sep 8

SOF9:05 pmSofia

29h 10m

1 stop

ORD6:15 pmChicago O'Hare Intl

$580

Turkish Airlines

Apr 27

ORD8:10 pmChicago O'Hare Intl

16h 05m

1 stop

SOF8:15 pmSofia

May 11

SOF9:05 pmSofia

20h 35m

1 stop

ORD9:40 amChicago O'Hare Intl

$582

Turkish Airlines

Aug 17

ORD11:25 amChicago O'Hare Intl

13h 20m

1 stop

SOF8:45 amSofia

Sep 2

SOF3:50 pmSofia

25h 50m

1 stop

ORD9:40 amChicago O'Hare Intl

$583

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

Sun 8/2

8:10 pm-8:15 pm

1 stop16h 05m

Sofia

Tue 9/8

9:05 pm-6:15 pm

1 stop29h 10m

$580

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

Mon 4/27

8:10 pm-8:15 pm

1 stop16h 05m

Sofia

Mon 5/11

9:05 pm-9:40 am

1 stop20h 35m

$582

St. LouisSofia

STL - SOF

STLSOF

Lambert-St Louis

Tue 5/5

2:15 pm-6:40 pm

2 stops20h 25m

Sofia

Tue 5/12

6:10 am-8:25 pm

2 stops22h 15m

$727

Quickest round-trip

St. LouisSofia

STL - SOF

STLSOF

Lambert-St Louis

Wed 5/6

5:59 pm-6:40 pm

2 stops16h 41m

Sofia

Wed 5/13

6:20 am-1:25 pm

1 stop15h 05m

$753

St. LouisSofia

STL - SOF

STLSOF

Lambert-St Louis

Wed 4/29

11:37 am-12:10 pm

2 stops16h 33m

Sofia

Tue 5/5

6:10 am-8:25 pm

2 stops22h 15m

$756

St. LouisSofia

STL - SOF

STLSOF

Lambert-St Louis

Wed 5/6

12:23 pm-2:00 pm

2 stops17h 37m

Sofia

Tue 1/12

7:00 am-8:37 pm

2 stops21h 37m

$761

St. LouisSofia

STL - SOF

STLSOF

Lambert-St Louis

Tue 5/5

2:15 pm-6:40 pm

2 stops20h 25m

Sofia

Tue 5/12

6:40 pm-1:25 pm

1 stop26h 45m

$766

St. LouisSofia

STL - SOF

STLSOF

Lambert-St Louis

Tue 9/1

12:10 pm-6:40 pm

2 stops22h 30m

Sofia

Tue 9/15

6:10 am-6:41 pm

2 stops20h 31m

$789

ChicagoSofia

MDW - SOF

MDWSOF

Chicago Midway

Sun 4/19

1:24 pm-2:00 pm

2 stops16h 36m

Sofia

Tue 5/5

7:00 am-6:36 pm

2 stops19h 36m

$863

ChicagoSofia

MDW - SOF

MDWSOF

Chicago Midway

Sun 4/19

1:24 pm-2:00 pm

2 stops16h 36m

Sofia

Tue 5/5

7:00 am-4:26 pm

2 stops17h 26m

$917

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 $575, 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 November instead. Flights to Sofia in November, while not as cheap as those in February, still average around $617.

How far in advance should I book a flight 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 $732 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 $691 on momondo.

Can stopping save me money on Illinois to Sofia flights?

You could potentially save up to 18% 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	13h 55m
Direct flights	None

The fastest flight from Illinois to Sofia takes 13h 55m

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

Search flight deals

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 March 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
ITA Airways	PriceFrom $469	Free Cancellation	Rating 6.7 1,173 reviews	Search ITA Airways flights
Turkish Airlines	PriceFrom $521	Free Cancellation	Rating 7.4 4,275 reviews	Search Turkish Airlines flights
KLM	PriceFrom $533	Free Cancellation	Rating 7.8 1,478 reviews	Search KLM flights
United Airlines	PriceFrom $563	Free Cancellation	Rating 7.4 9,478 reviews	Search United Airlines flights
SWISS	PriceFrom $565	Free Cancellation	Rating 7.5 1,903 reviews	Search SWISS flights
Austrian Airlines	PriceFrom $575	Free Cancellation	Rating 7.6 902 reviews	Search Austrian Airlines flights
Lufthansa	PriceFrom $580	Free Cancellation	Rating 6.8 7,867 reviews	Search Lufthansa flights
LOT	PriceFrom $585	Free Cancellation	Rating 7.5 1,182 reviews	Search LOT flights
Air France	PriceFrom $585	Free Cancellation	Rating 7.4 1,552 reviews	Search Air France flights
British Airways	PriceFrom $609	Free Cancellation	Rating 6.7 7,819 reviews	Search British Airways 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.