Which airport is the most popular layover for flights between Chicago and Sofia?

Istanbul (IST) was the most common stop: 40% of momondo users choosing 1-stop flights on this route connected there.

Which layover airport offers the lowest fares from Chicago to Sofia?

Flights via Zurich (ZRH) offer the lowest average round-trip price of $696.

Which layover airport has the shortest travel time from Chicago to Sofia?

Flights connecting via Vienna (VIE) have the shortest average one-way travel time: 12h 13m.

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

British Airways is the most popular carrier operating from Chicago to Sofia

What airlines fly to Sofia?

Lufthansa, Turkish Airlines and LOT are the top three most popular airlines that fly to Sofia from Chicago according to our data. Lufthansa 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.

Which layover airport has the shortest connection time from Chicago to Sofia?

Warsaw (WAW) has the shortest average layover time for this route: 1h 36m.

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

Prices for flights from Chicago to Sofia Airport were last updated today.

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

As of April 2026, there are 12 operators available to choose from for flights from Chicago to Sofia Airport.

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

The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from Chicago to Sofia Airport.

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

The travel and health documents required for your trip to Sofia Airport can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at Sofia Airport. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

$305 Cheap Flights from Chicago to Sofia in 2026

Q: What is the typical price of a round-trip flight between Chicago and Sofia?

Prices are currently low for flights on this route. Typical prices usually range from $788 to $608. The lowest price recently found on this route was $647.

1 adult

0 bags

Discover deals from 900+ travel sites with momondo.

Find the cheapest flights from Chicago 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

4:00 pm - 11:05 am

SOF

ORD

26h 05m

1 stop

$647Turkish Airlines

Sun, Oct 11 - Sun, Oct 25

8:10 pm - 3:00 pm

ORD

SOF

34h 50m

1 stop

3:50 pm - 9:40 am

SOF

ORD

25h 50m

1 stop

$676Turkish Airlines

Tue, Aug 18 - Tue, Sep 1

11:25 am - 3:00 pm

ORD

SOF

19h 35m

1 stop

3:50 pm - 9:40 am

SOF

ORD

25h 50m

1 stop

$685Turkish Airlines

Fri, Sep 11 - Sat, Sep 19

8:10 pm - 1:15 pm

ORD

SOF

33h 05m

1 stop

9:05 pm - 9:40 am

SOF

ORD

20h 35m

1 stop

$686Turkish Airlines

Fri, Aug 14 - Sat, Sep 12

8:10 pm - 3:00 pm

ORD

SOF

34h 50m

1 stop

9:35 am - 9:40 am

SOF

ORD

32h 05m

1 stop

$692Turkish Airlines

Sat, Aug 8 - Wed, Sep 9

8:10 pm - 8:15 pm

ORD

SOF

16h 05m

1 stop

9:05 pm - 9:40 am

SOF

ORD

20h 35m

1 stop

$694Turkish Airlines

Sat, Aug 1 - Tue, Sep 8

1:16 pm - 2:00 pm

MDW

SOF

16h 44m

2 stops

7:00 am - 4:27 pm

SOF

MDW

17h 27m

2 stops

$847KLM

Sat, Aug 8 - Fri, Aug 21

1:22 pm - 2:00 pm

MDW

SOF

16h 38m

2 stops

7:00 am - 5:56 pm

SOF

MDW

18h 56m

2 stops

$852KLM

Wed, May 13 - Wed, May 27

1:49 pm - 2:00 pm

MDW

SOF

16h 11m

2 stops

7:00 am - 4:27 pm

SOF

MDW

17h 27m

2 stops

$873Multiple Airlines

Sat, Jul 4 - Fri, Aug 21

1:16 pm - 2:00 pm

MDW

SOF

16h 44m

2 stops

7:00 am - 6:05 pm

SOF

MDW

19h 05m

2 stops

$904KLM

Sat, Aug 8 - Wed, Sep 9

Save money when you book flights with momondo

Big names and deals

Search 100s of travel sites to compare prices.

Filter for what you want

Free Wi-Fi? Stopover? Instantly customize your results.

Trusted and free

We’re completely free to use - no hidden charges or fees.

Price Alerts

Not ready to book? to track prices.

Search flight deals

Turkish Airlines flights from Chicago to Sofia

Our best Turkish Airlines deals on Chicago to Sofia flight tickets

Turkish Airlines

Oct 11

ORD8:10 pmChicago O'Hare Intl

16h 05m

1 stop

SOF8:15 pmSofia

Oct 25

SOF4:00 pmSofia

26h 05m

1 stop

ORD11:05 amChicago O'Hare Intl

$647

Turkish Airlines

Apr 19

ORD8:10 pmChicago O'Hare Intl

16h 05m

1 stop

SOF8:15 pmSofia

May 5

SOF9:05 pmSofia

20h 35m

1 stop

ORD9:40 amChicago O'Hare Intl

$669

Turkish Airlines

Aug 18

ORD8:10 pmChicago O'Hare Intl

34h 50m

1 stop

SOF3:00 pmSofia

Sep 1

SOF3:50 pmSofia

25h 50m

1 stop

ORD9:40 amChicago O'Hare Intl

$676

KLM flights from Chicago to Sofia

Our best KLM deals on Chicago to Sofia flight tickets

KLM

Aug 8

MDW1:16 pmChicago Midway

16h 44m

2 stops

SOF2:00 pmSofia

Aug 21

SOF7:00 amSofia

17h 27m

2 stops

MDW4:27 pmChicago Midway

$847

KLM

May 13

MDW1:22 pmChicago Midway

16h 38m

2 stops

SOF2:00 pmSofia

May 27

SOF7:00 amSofia

18h 56m

2 stops

MDW5:56 pmChicago Midway

$852

KLM

Aug 8

MDW1:16 pmChicago Midway

16h 44m

2 stops

SOF2:00 pmSofia

Sep 9

SOF7:00 amSofia

19h 05m

2 stops

MDW6:05 pmChicago Midway

$904

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

Sun 10/11

8:10 pm-8:15 pm

1 stop16h 05m

Sofia

Sun 10/25

4:00 pm-11:05 am

1 stop26h 05m

$647

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

Tue 8/18

8:10 pm-3:00 pm

1 stop34h 50m

Sofia

Tue 9/1

3:50 pm-9:40 am

1 stop25h 50m

$676

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

$685

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

Fri 8/14

8:10 pm-1:15 pm

1 stop33h 05m

Sofia

Sat 9/12

9:05 pm-9:40 am

1 stop20h 35m

$686

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

Sat 8/8

8:10 pm-3:00 pm

1 stop34h 50m

Sofia

Wed 9/9

9:35 am-9:40 am

1 stop32h 05m

$692

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

Sat 8/1

8:10 pm-8:15 pm

1 stop16h 05m

Sofia

Tue 9/8

9:05 pm-9:40 am

1 stop20h 35m

$694

ChicagoSofia

MDW - SOF

MDWSOF

Chicago Midway

Sat 8/8

1:16 pm-2:00 pm

2 stops16h 44m

Sofia

Fri 8/21

7:00 am-4:27 pm

2 stops17h 27m

$847

ChicagoSofia

MDW - SOF

MDWSOF

Chicago Midway

Wed 5/13

1:22 pm-2:00 pm

2 stops16h 38m

Sofia

Wed 5/27

7:00 am-5:56 pm

2 stops18h 56m

$852

Quickest round-trip

ChicagoSofia

MDW - SOF

MDWSOF

Chicago Midway

Sat 7/4

1:49 pm-2:00 pm

2 stops16h 11m

Sofia

Fri 8/21

7:00 am-4:27 pm

2 stops17h 27m

$873

ChicagoSofia

MDW - SOF

MDWSOF

Chicago Midway

Sat 8/8

1:16 pm-2:00 pm

2 stops16h 44m

Sofia

Wed 9/9

7:00 am-6:05 pm

2 stops19h 05m

$904

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 Chicago 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

Layovers

What is the typical price of a round-trip flight between Chicago and Sofia?

What is the cheapest month to fly to Sofia?

The cheapest month to fly to Sofia from Chicago 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 Chicago 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 to Sofia?

You are more likely to see cheaper flights to Sofia from Chicago when booking weeks ahead of your departure date. In general, you can expect to find flights to Sofia for around $747 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Sofia from Chicago for as low as $713 on momondo.

Can stopping save me money on Chicago to Sofia flights?

You could potentially save up to 4% on your flight if you consider stops on a Chicago to Sofia flight.

How have Chicago to Sofia flight prices changed over time?

As of April 2026, prices for Chicago to Sofia flights are approximately 15% cheaper when compared to flights at the same time last year.

When to book flights from Chicago to Sofia

Are you open to changing your travel dates? Check out the ideal times to fly from Chicago to Sofia according to our flight data. Find out which month and days have the cheapest flights.

Estimated round-trip price

Cheap Chicago to Sofia (CHI to SOF) flight deals and tips

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

Fastest flight time	11h 50m
Direct flights	None

The fastest flight from Chicago to Sofia takes 11h 50m

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

Search flight deals

Frequently asked questions about flying from Chicago to Sofia

How far is Chicago to Sofia by plane?
A flight from Chicago to Sofia will travel around 5185.9 mi. A reasonable flight in good conditions will take 11h 50m.
When did momondo last update prices for flights from Chicago to Sofia Airport?
Prices for flights from Chicago to Sofia Airport were last updated today.
How many operators does momondo search for flights from Chicago to Sofia Airport?
As of April 2026, there are 12 operators available to choose from for flights from Chicago to Sofia Airport.
How old do you have to be to fly from Chicago to Sofia Airport?
The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from Chicago to Sofia Airport.
What documentation or ID do you need to fly to Sofia Airport?
The travel and health documents required for your trip to Sofia Airport can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at Sofia Airport. We always recommend checking with your airline or a trusted third party such as IATA to get advice.
What is the most popular airline from Chicago to Sofia?
momondo data reveals that the most frequently booked airline on the route from Chicago to Sofia is Lufthansa, representing 28% of all bookings. The subsequent popular airlines are Turkish Airlines at 27%, LOT at 15%, and United Airlines at 14%.

Best airlines flying from Chicago to Sofia

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

Airline	Rating	Free Cancellation	Price
KLM	PriceFrom $425	Free Cancellation	Rating 7.8 1,502 reviews	Search KLM flights
ITA Airways	PriceFrom $508	Free Cancellation	Rating 6.7 1,191 reviews	Search ITA Airways flights
Turkish Airlines	PriceFrom $521	Free Cancellation	Rating 7.3 4,308 reviews	Search Turkish Airlines flights
United Airlines	PriceFrom $561	Free Cancellation	Rating 7.4 9,605 reviews	Search United Airlines flights
SWISS	PriceFrom $564	Free Cancellation	Rating 7.6 1,923 reviews	Search SWISS flights
Austrian Airlines	PriceFrom $575	Free Cancellation	Rating 7.6 902 reviews	Search Austrian Airlines flights
LOT	PriceFrom $580	Free Cancellation	Rating 7.5 1,188 reviews	Search LOT flights
Lufthansa	PriceFrom $582	Free Cancellation	Rating 6.8 7,930 reviews	Search Lufthansa flights
Air France	PriceFrom $585	Free Cancellation	Rating 7.4 1,572 reviews	Search Air France flights
British Airways	PriceFrom $609	Free Cancellation	Rating 6.7 7,892 reviews	Search British Airways flights

Bansko

Borovets

Velingrad

Sandanski

Why use momondo?

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

momondo collates all your flight options in one place and lets you filter them to find the perfect flight from Chicago to Sofia. momondo saves you time and could save you money on your trip.

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

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

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

momondo helps you find the best flight between Chicago 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 Chicago to Sofia right now. Can momondo alert me if prices change?

If you are simply researching potential flights to Sofia, momondo offers a useful price alert feature which will track prices for flights to Sofia from Chicago and alert you when they change.

An easier way to manage your Sofia trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.

Start using Trips

Find my bookings

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.

1 adult

Mon 5/18

Mon 5/25

Email me momondo's favorite deals

By creating a price alert you accept our terms of use and privacy policy.

Find better results for your trip to Bulgaria

Airlines

Cabin classes

Other Bulgaria destinations

Other flights from Chicago

Complete your trip

Feeling lucky

Fly your favorite airline to Sofia

Cheap flights from Chicago to Sofia from $305

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Chicago to Sofia departing on 5/12. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.

Find the cheapest flights from Chicago to Sofia

Cheap round-trip flights

Cheap one-way flights

Cheap last minute flights

Big names and deals

Big names and deals

Filter for what you want

Filter for what you want

Trusted and free

Trusted and free

Price Alerts

Price Alerts

Turkish Airlines flights from Chicago to Sofia

Our best Turkish Airlines deals on Chicago to Sofia flight tickets

KLM flights from Chicago to Sofia

Our best KLM deals on Chicago to Sofia flight tickets

momondo Fare Finder

Use the filters below to find and compare flights from Chicago to Sofia that are best for you.

See travel insights to Sofia from

How to get the cheapest flight ticket from Chicago to Sofia

What is the typical price of a round-trip flight between Chicago and Sofia?

What is the cheapest month to fly to Sofia?

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

Can stopping save me money on Chicago to Sofia flights?

How have Chicago to Sofia flight prices changed over time?

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

What airlines fly to Sofia?

Which airport is the most popular layover for flights between Chicago and Sofia?

Which layover airport offers the lowest fares from Chicago to Sofia?

Which layover airport has the shortest travel time from Chicago to Sofia?

Which layover airport has the shortest connection time from Chicago to Sofia?

When to book flights from Chicago to Sofia

Cheap Chicago to Sofia (CHI to SOF) flight deals and tips

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

Fastest flight time

Direct flights

Frequently asked questions about flying from Chicago to Sofia

Best airlines flying from Chicago to Sofia

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

Traveling to a place near Sofia?

Why use momondo?

An easier way to manage your Sofia trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.

Find better results for your trip to Bulgaria

Fly your favorite airline to Sofia

Airlines are sorted and displayed according to clicks in the past 7 days on momondo

Cabin classes currently available on flights to Sofia

List of cabin classes available on flights landing in Sofia. Availability may vary depending on flight origin and airline.

Popular cities in Bulgaria

Popular flights according to clicks in the last 7 days on momondo

Fly to other destinations from Chicago

According to popular flight searches on momondo this year

Complete your trip to Sofia

Explore popular destinations other users love

According to popular flight searches on momondo this year