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?

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 May 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.

$332 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.

8:55 am - 12:10 pm

STL

SOF

19h 15m

2 stops

6:20 am - 1:25 pm

SOF

STL

15h 05m

1 stop

$818Multiple Airlines

Wed, Sep 9 - Wed, Sep 16

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

Fri, Sep 11 - Sat, Sep 19

5:10 pm - 2:00 pm

ORD

SOF

12h 50m

1 stop

7:00 am - 2:15 pm

SOF

ORD

15h 15m

1 stop

$834Multiple Airlines

Tue, Jul 28 - Tue, Aug 18

12:30 pm - 12:10 pm

STL

SOF

15h 40m

2 stops

6:20 am - 1:25 pm

SOF

STL

15h 05m

1 stop

$838United Airlines

Wed, Sep 9 - Wed, Sep 16

12:30 pm - 12:10 pm

STL

SOF

15h 40m

2 stops

6:20 am - 1:25 pm

SOF

STL

15h 05m

1 stop

$839United Airlines

Wed, Sep 9 - Wed, Sep 16

12:57 pm - 11:40 am

ORD

SOF

14h 43m

2 stops

7:55 am - 6:33 pm

SOF

ORD

18h 38m

2 stops

$839Austrian Airlines

Thu, Sep 3 - Wed, Nov 11

12:11 pm - 12:10 pm

ORD

SOF

15h 59m

2 stops

7:25 pm - 12:35 pm

SOF

ORD

25h 10m

1 stop

$842Lufthansa

Wed, Aug 5 - Tue, Aug 25

2:07 pm - 2:00 pm

ORD

SOF

15h 53m

2 stops

7:00 am - 2:15 pm

SOF

ORD

15h 15m

1 stop

$843KLM

Tue, Jul 28 - Tue, Aug 18

1:18 pm - 2:00 pm

MDW

SOF

16h 42m

2 stops

7:00 am - 6:01 pm

SOF

MDW

19h 01m

2 stops

$878KLM

Sun, Aug 2 - Mon, Aug 17

3:30 pm - 6:05 pm

STL

SOF

18h 35m

1 stop

6:20 am - 1:25 pm

SOF

STL

15h 05m

1 stop

$1,010Lufthansa

Wed, Sep 9 - Wed, Sep 16

Lufthansa flights from Illinois to Sofia

Our best Lufthansa deals on Illinois to Sofia flight tickets

Lufthansa

Aug 5

ORD12:11 pmChicago O'Hare Intl

15h 59m

2 stops

SOF12:10 pmSofia

Aug 25

SOF7:25 pmSofia

25h 10m

1 stop

ORD12:35 pmChicago O'Hare Intl

$842

Lufthansa

Jul 27

ORD9:40 pmChicago O'Hare Intl

13h 00m

1 stop

SOF6:40 pmSofia

Aug 12

SOF7:00 pmSofia

25h 55m

1 stop

ORD12:55 pmChicago O'Hare Intl

$855

Lufthansa

May 11

ORD3:35 pmChicago O'Hare Intl

12h 35m

1 stop

SOF12:10 pmSofia

May 25

SOF6:10 amSofia

14h 25m

1 stop

ORD12:35 pmChicago O'Hare Intl

$896

KLM flights from Illinois to Sofia

Our best KLM deals on Illinois to Sofia flight tickets

KLM

Jul 28

ORD2:07 pmChicago O'Hare Intl

15h 53m

2 stops

SOF2:00 pmSofia

Aug 18

SOF7:00 amSofia

15h 15m

1 stop

ORD2:15 pmChicago O'Hare Intl

$843

KLM

Aug 1

ORD2:31 pmChicago O'Hare Intl

15h 29m

2 stops

SOF2:00 pmSofia

Aug 26

SOF7:00 amSofia

17h 54m

2 stops

ORD4:54 pmChicago O'Hare Intl

$847

KLM

Aug 2

ORD2:07 pmChicago O'Hare Intl

15h 53m

2 stops

SOF2:00 pmSofia

Sep 24

SOF7:00 amSofia

18h 41m

2 stops

ORD5:41 pmChicago O'Hare Intl

$853

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

St. LouisSofia

STL - SOF

STLSOF

Lambert-St Louis

Wed 9/9

8:55 am-12:10 pm

2 stops19h 15m

Sofia

Wed 9/16

6:20 am-1:25 pm

1 stop15h 05m

$818

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

Fri 9/11

11:25 am-3:00 pm

1 stop19h 35m

Sofia

Sat 9/19

3:50 pm-9:40 am

1 stop25h 50m

$827

Quickest round-trip

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

Tue 7/28

5:10 pm-2:00 pm

1 stop12h 50m

Sofia

Tue 8/18

7:00 am-2:15 pm

1 stop15h 15m

$834

St. LouisSofia

STL - SOF

STLSOF

Lambert-St Louis

Wed 9/9

12:30 pm-12:10 pm

2 stops15h 40m

Sofia

Wed 9/16

6:20 am-1:25 pm

1 stop15h 05m

$838

St. LouisSofia

STL - SOF

STLSOF

Lambert-St Louis

Wed 9/9

12:30 pm-12:10 pm

2 stops15h 40m

Sofia

Wed 9/16

6:20 am-1:25 pm

1 stop15h 05m

$839

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

Thu 9/3

12:57 pm-11:40 am

2 stops14h 43m

Sofia

Wed 11/11

7:55 am-6:33 pm

2 stops18h 38m

$839

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

Wed 8/5

12:11 pm-12:10 pm

2 stops15h 59m

Sofia

Tue 8/25

7:25 pm-12:35 pm

1 stop25h 10m

$842

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

Tue 7/28

2:07 pm-2:00 pm

2 stops15h 53m

Sofia

Tue 8/18

7:00 am-2:15 pm

1 stop15h 15m

$843

ChicagoSofia

MDW - SOF

MDWSOF

Chicago Midway

Sun 8/2

1:18 pm-2:00 pm

2 stops16h 42m

Sofia

Mon 8/17

7:00 am-6:01 pm

2 stops19h 01m

$878

St. LouisSofia

STL - SOF

STLSOF

Lambert-St Louis

Wed 9/9

3:30 pm-6:05 pm

1 stop18h 35m

Sofia

Wed 9/16

6:20 am-1:25 pm

1 stop15h 05m

$1,010

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 October. Flight prices, which tend to average around $385, are often lower during this time because this is during the off-season. If you aren’t able to travel during the month of October, then book flights to Sofia from Illinois during November instead. Flights to Sofia in November, while not as cheap as those in October, still average around $429.

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 $750 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 $739 on momondo.

Can stopping save me money on Illinois to Sofia flights?

You could potentially save up to 14% 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 35m
Direct flights	None

The fastest flight from Illinois to Sofia takes 12h 35m

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 May 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
KLM	PriceFrom $425	Free Cancellation	Rating 7.8 1,510 reviews	Search KLM flights
ITA Airways	PriceFrom $508	Free Cancellation	Rating 6.7 1,210 reviews	Search ITA Airways flights
Turkish Airlines	PriceFrom $521	Free Cancellation	Rating 7.4 4,356 reviews	Search Turkish Airlines flights
United Airlines	PriceFrom $561	Free Cancellation	Rating 7.4 9,693 reviews	Search United Airlines flights
SWISS	PriceFrom $564	Free Cancellation	Rating 7.6 1,937 reviews	Search SWISS flights
Lufthansa	PriceFrom $580	Free Cancellation	Rating 6.8 7,984 reviews	Search Lufthansa flights
LOT	PriceFrom $581	Free Cancellation	Rating 7.5 1,193 reviews	Search LOT flights
Air France	PriceFrom $585	Free Cancellation	Rating 7.4 1,585 reviews	Search Air France flights
Austrian Airlines	PriceFrom $587	Free Cancellation	Rating 7.6 915 reviews	Search Austrian Airlines flights
British Airways	PriceFrom $609	Free Cancellation	Rating 6.7 7,954 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.