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

Flights via Paris (CDG) offer the lowest average round-trip price of $706.

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

Istanbul (IST) was the most common stop: 35% of momondo users choosing 1-stop flights on this route connected there.

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

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

What airlines fly to Sofia?

Turkish Airlines, Lufthansa and LOT are the top three most popular airlines that fly to Sofia from Chicago according to our data. Turkish Airlines is the first choice among our users, with 30% of people opting to fly with this airline when traveling to Sofia. Keep in mind that there are 10 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 travel time from Chicago to Sofia?

Flights connecting via Vienna (VIE) have the shortest average one-way travel time: 12h 02m.

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

Vienna (VIE) has the shortest average layover time for this route: 1h 49m.

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 August 2025, there are 10 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.

$232 Cheap Flights from Chicago to Sofia (CHI-SOF) in 2025

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Find the cheapest flights from Chicago to Sofia (CHI-SOF)

Round-trip

One-way

Last minute

Cheap round-trip flights

11:45 pm - 8:35 amORD-SOF

24h 50m1 stop

3:35 pm - 9:40 amSOF-ORD

26h 05m1 stop

$490Turkish Airlines

Find Deal

Mon, Aug 25 - Wed, Sep 10

11:25 am - 2:45 pmORD-SOF

19h 20m1 stop

9:15 pm - 9:40 amSOF-ORD

20h 25m1 stop

$497Turkish Airlines

Find Deal

Mon, Sep 29 - Fri, Oct 17

11:45 pm - 2:45 pmORD-SOF

31h 00m1 stop

9:40 pm - 11:05 amSOF-ORD

20h 25m1 stop

$499Turkish Airlines

Find Deal

Sat, Sep 27 - Wed, Oct 29

7:50 pm - 8:25 pmORD-SOF

16h 35m1 stop

10:05 am - 6:25 pmSOF-ORD

16h 20m1 stop

$507Turkish Airlines

Find Deal

Mon, Oct 13 - Wed, Nov 5

1:00 pm - 11:50 amORD-SOF

14h 50m2 stops

7:55 am - 2:00 pmSOF-ORD

14h 05m1 stop

$594Austrian Airlines

Find Deal

Wed, Nov 12 - Wed, Nov 26

9:40 pm - 11:00 pmORD-SOF

17h 20m1 stop

2:35 pm - 8:05 pmSOF-ORD

13h 30m1 stop

$600United Airlines

Find Deal

Tue, Sep 9 - Fri, Nov 21

6:00 pm - 6:20 pmORD-SOF

16h 20m1 stop

6:10 am - 6:27 pmSOF-ORD

20h 17m2 stops

$602United Airlines

Find Deal

Wed, Jan 14 - Wed, Jan 28

4:00 pm - 1:00 pmORD-SOF

13h 00m1 stop

2:35 pm - 8:05 pmSOF-ORD

13h 30m1 stop

$604Lufthansa

Find Deal

Sun, Sep 7 - Thu, Nov 20

1:08 pm - 2:00 pmMDW-SOF

16h 52m2 stops

7:00 am - 5:37 pmSOF-MDW

18h 37m2 stops

$759KLM

Find Deal

Mon, Aug 25 - Wed, Sep 10

1:43 pm - 2:00 pmMDW-SOF

16h 17m2 stops

7:00 am - 4:09 pmSOF-MDW

17h 09m2 stops

$802KLM

Find Deal

Mon, Sep 8 - Mon, Oct 13

Turkish Airlines flights from Chicago to Sofia

Our best Turkish Airlines deals on Chicago to Sofia flight tickets

Turkish Airlines

Aug 25

ORD11:45 pmChicago O'Hare Intl

24h 50m

1 stop

SOF8:35 amSofia

Sep 10

SOF3:35 pmSofia

26h 05m

1 stop

ORD9:40 amChicago O'Hare Intl

$490

Find similar

Turkish Airlines

Sep 29

ORD11:25 amChicago O'Hare Intl

19h 20m

1 stop

SOF2:45 pmSofia

Oct 17

SOF9:15 pmSofia

20h 25m

1 stop

ORD9:40 amChicago O'Hare Intl

$497

Find similar

Turkish Airlines

Sep 27

ORD11:45 pmChicago O'Hare Intl

31h 00m

1 stop

SOF2:45 pmSofia

Oct 29

SOF9:40 pmSofia

20h 25m

1 stop

ORD11:05 amChicago O'Hare Intl

$499

Find similar

KLM flights from Chicago to Sofia

Our best KLM deals on Chicago to Sofia flight tickets

KLM

Aug 25

MDW1:08 pmChicago Midway

16h 52m

2 stops

SOF2:00 pmSofia

Sep 10

SOF7:00 amSofia

18h 37m

2 stops

MDW5:37 pmChicago Midway

$759

Find similar

KLM

Sep 8

MDW1:43 pmChicago Midway

16h 17m

2 stops

SOF2:00 pmSofia

Oct 13

SOF7:00 amSofia

17h 09m

2 stops

MDW4:09 pmChicago Midway

$802

Find similar

KLM

Aug 31

MDW12:15 pmChicago Midway

17h 45m

2 stops

SOF2:00 pmSofia

Sep 15

SOF7:00 amSofia

22h 36m

2 stops

MDW9:36 pmChicago Midway

$819

Find similar

Fly from

Fly to

Route

Depart

Return

Price

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

Mon 8/25

11:45 pm-8:35 am

1 stop24h 50m

Sofia

Wed 9/10

3:35 pm-9:40 am

1 stop26h 05m

$490

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

Mon 9/29

11:25 am-2:45 pm

1 stop19h 20m

Sofia

Fri 10/17

9:15 pm-9:40 am

1 stop20h 25m

$497

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

Sat 9/27

11:45 pm-2:45 pm

1 stop31h 00m

Sofia

Wed 10/29

9:40 pm-11:05 am

1 stop20h 25m

$499

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

Mon 10/13

7:50 pm-8:25 pm

1 stop16h 35m

Sofia

Wed 11/5

10:05 am-6:25 pm

1 stop16h 20m

$507

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

Wed 11/12

1:00 pm-11:50 am

2 stops14h 50m

Sofia

Wed 11/26

7:55 am-2:00 pm

1 stop14h 05m

$594

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

Tue 9/9

9:40 pm-11:00 pm

1 stop17h 20m

Sofia

Fri 11/21

2:35 pm-8:05 pm

1 stop13h 30m

$600

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

Wed 1/14

6:00 pm-6:20 pm

1 stop16h 20m

Sofia

Wed 1/28

6:10 am-6:27 pm

2 stops20h 17m

$602

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

Sun 9/7

4:00 pm-1:00 pm

1 stop13h 00m

Sofia

Thu 11/20

2:35 pm-8:05 pm

1 stop13h 30m

$604

ChicagoSofia

MDW - SOF

MDWSOF

Chicago Midway

Mon 8/25

1:08 pm-2:00 pm

2 stops16h 52m

Sofia

Wed 9/10

7:00 am-5:37 pm

2 stops18h 37m

$759

ChicagoSofia

MDW - SOF

MDWSOF

Chicago Midway

Mon 9/8

1:43 pm-2:00 pm

2 stops16h 17m

Sofia

Mon 10/13

7:00 am-4:09 pm

2 stops17h 09m

$802

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 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 $565, 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 March instead. Flights to Sofia in March, while not as cheap as those in February, still average around $588.

What is the cheapest day to depart on your flight to Sofia?

According to our data, Thursday is the cheapest day to fly to Sofia from Chicago. The lowest ticket price found for a Thursday departure recently was $871. Keep in mind that prices can always vary depending on your route and whether or not you are flying domestic or international. Flights from Chicago to Sofia on a Saturday will generally be more expensive and average around $1,039. Keep in mind that these prices on both days could fluctuate depending on the season and the demand.

What is the cheapest time of day to depart on your flight to Sofia?

In the morning is the cheapest time of day to fly from Chicago to Sofia when you can find flight prices for as low as $801. Flying to Sofia in the morning is an ideal time because this is during off-peak travel hours. At noon is when there is more demand to fly to Sofia, so prices are often more expensive at around $1,145 per ticket.

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 $769 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 $743 on momondo.

How have Chicago to Sofia flight prices changed over time?

As of August 2025, prices for Chicago to Sofia flights are approximately 5% 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

Best Price Found	$232
Fastest flight time	11h 30m
Direct flights	None
Airports in Sofia	1 airport

The best one-way flight to Sofia from Chicago in the past 72 hours is $232. The best round-trip flight deal from Chicago to Sofia found on momondo in the last 72 hours is $490.

The fastest flight from Chicago to Sofia takes 11h 30m

There are no direct flights from Chicago to Sofia. Popular non-direct route for this connection is Chicago O'Hare Intl Airport - Sofia Airport.

There is 1 airport near Sofia: Sofia (SOF)

Search flight deals

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 30m.
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 August 2025, there are 10 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 Turkish Airlines, representing 26% of all bookings. The subsequent popular airlines are Lufthansa at 24%, LOT at 20%, 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
Turkish Airlines	PriceFrom $496	Free Cancellation	Rating 7.3 3,940 reviews	Search Turkish Airlines flights
Air France	PriceFrom $498	Free Cancellation	Rating 7.4 1,467 reviews	Search Air France flights
KLM	PriceFrom $533	Free Cancellation	Rating 7.8 1,381 reviews	Search KLM flights
LOT	PriceFrom $570	Free Cancellation	Rating 7.6 1,107 reviews	Search LOT flights
Lufthansa	PriceFrom $588	Free Cancellation	Rating 6.8 7,317 reviews	Search Lufthansa flights
Austrian Airlines	PriceFrom $591	Free Cancellation	Rating 7.6 829 reviews	Search Austrian Airlines flights
SWISS	PriceFrom $596	Free Cancellation	Rating 7.5 1,699 reviews	Search SWISS flights
United Airlines	PriceFrom $601	Free Cancellation	Rating 7.4 8,916 reviews	Search United Airlines flights
British Airways	PriceFrom $628	Free Cancellation	Rating 6.6 7,266 reviews	Search British Airways flights
Air Serbia	PriceFrom $652	Free Cancellation	Rating 6.2 199 reviews	Search Air Serbia 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.