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$335+ Cheap flights from Sofia (SOF) to Chicago (CHI)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 1/11. Fares are subject to change and may not be available on all flights or dates of travel.
SOF — CHI
Oct 11 — Oct 181
Sat 10/11
Sat 10/18
1 adult, Economy
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Cheapflights Tip: The best prices from Sofia to Chicago are usually found in November or October, booked 89 days in advance, depart on a Thursday or Tuesday and return on a Thursday

Cheap flight deals from Sofia to Chicago

Discover tips and strategies to find the most affordable flight options for your journey from Sofia (SOF) to Chicago (CHI). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated September 11, 2025.

Round-trip from

$637
(oojo)

One-way from

$335
(Kiwi.com)

Popular in

May

Cheapest in

November

Average price

$812
From Sofia to Chicago (CHI)
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One-way flight from Sofia to Chicago (CHI)
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Highest demand for flights based on searches. 4% potential increase in price ($39 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease ($23 potential savings vs. average RT price).
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Average for round-trip flights in September 2025
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Find flight deals from Sofia to Chicago

Cheapest flights from Sofia to Chicago
Explore the most affordable flight options available from Sofia to Chicago. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 11, 2025.

This oojo deal was found by Cheapflights users on 9/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/272:35 pmSOF - ORD
1 stop29h 30mLOT
Tue 10/79:40 pmORD - SOF
1 stop32h 10mLOT
Deal found 9/10$637
This oojo deal was found by Cheapflights users on 9/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/16:40 pmSOF - ORD
1 stop28h 30mLOT
Thu 3/2610:55 pmORD - SOF
1 stop11h 55mLOT
Deal found 9/10$639
This FlightHub deal was found by Cheapflights users on 9/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/255:20 amSOF - ORD
1 stop22h 20mLOT
Thu 10/29:40 pmORD - SOF
1 stop12h 15mLOT
Deal found 9/10$640
This LOT deal was found by Cheapflights users on 9/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure LOT is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/172:35 pmSOF - ORD
1 stop13h 25mLOT
Thu 1/89:55 pmORD - SOF
1 stop11h 55mLOT
Deal found 9/10$641
This KLM deal was found by Cheapflights users on 9/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/17:00 amSOF - ORD
1 stop15h 20mMultiple Airlines
Sat 11/152:30 pmORD - SOF
2 stops15h 25mMultiple Airlines
Deal found 9/11$643
This KLM deal was found by Cheapflights users on 9/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/147:00 amSOF - ORD
1 stop15h 10mMultiple Airlines
Fri 11/145:20 pmORD - SOF
1 stop12h 35mMultiple Airlines
Deal found 9/9$644
This KLM deal was found by Cheapflights users on 9/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/37:00 amSOF - ORD
1 stop15h 10mMultiple Airlines
Thu 10/165:10 pmORD - SOF
1 stop12h 50mMultiple Airlines
Deal found 9/10$645
This American Airlines deal was found by Cheapflights users on 9/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/179:30 pmSOF - ORD
2 stops26h 15mAmerican Airlines
Sat 10/44:28 pmORD - SOF
2 stops19h 52mAmerican Airlines
Deal found 9/10$646
This KLM deal was found by Cheapflights users on 9/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/177:00 amSOF - ORD
1 stop15h 20mMultiple Airlines
Sat 1/171:30 pmORD - SOF
2 stops16h 25mMultiple Airlines
Deal found 9/9$649
This Air France deal was found by Cheapflights users on 9/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Air France is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/187:00 amSOF - ORD
1 stop16h 00mAir France
Sat 10/45:10 pmORD - SOF
1 stop12h 50mAir France
Deal found 9/10$651
This British Airways deal was found by Cheapflights users on 9/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure British Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/112:05 pmSOF - ORD
1 stop14h 40mBritish Airways
Sat 11/1511:48 amORD - SOF
2 stops17h 12mBritish Airways
Deal found 9/11$652
This KLM deal was found by Cheapflights users on 9/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/247:00 amSOF - MDW
2 stops18h 35mMultiple Airlines
Thu 10/21:08 pmMDW - SOF
2 stops16h 52mMultiple Airlines
Deal found 9/10$659

Cheapflights Fare Finder

 
Customize your flight search to find flights from Sofia to Chicago that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated September 11, 2025.
Use the filters below to find and compare flights from Sofia to Chicago that are best for you.

Fly from

Sofia

Fly to

Chicago

Route

Depart

Return

Price

SofiaChicago

SOF - ORD

SOFORD

Sofia

Mon 10/27

6:35 pm-9:00 pm

1 stop33h 25m

Chicago O'Hare Intl

Wed 11/5

9:55 pm-5:50 pm

1 stop11h 55m

$641

SofiaChicago

SOF - ORD

SOFORD

Sofia

Sat 11/1

7:00 am-3:20 pm

1 stop15h 20m

Chicago O'Hare Intl

Sat 11/15

2:30 pm-1:55 pm

2 stops15h 25m

$643

SofiaChicago

SOF - ORD

SOFORD

Sofia

Fri 10/3

7:00 am-2:10 pm

1 stop15h 10m

Chicago O'Hare Intl

Thu 10/16

5:10 pm-2:00 pm

1 stop12h 50m

$645

SofiaChicago

SOF - ORD

SOFORD

Sofia

Sat 10/25

7:00 am-2:10 pm

1 stop15h 10m

Chicago O'Hare Intl

Sun 11/2

5:20 pm-1:55 pm

1 stop12h 35m

$645

SofiaChicago

SOF - ORD

SOFORD

Sofia

Wed 12/17

7:00 am-2:20 pm

1 stop15h 20m

Chicago O'Hare Intl

Sat 1/17

1:30 pm-1:55 pm

2 stops16h 25m

$649

SofiaChicago

SOF - ORD

SOFORD

Sofia

Tue 10/14

7:00 am-2:10 pm

1 stop15h 10m

Chicago O'Hare Intl

Fri 11/14

2:30 pm-1:55 pm

2 stops15h 25m

$649

SofiaChicago

SOF - MDW

SOFMDW

Sofia

Wed 9/24

7:00 am-5:35 pm

2 stops18h 35m

Chicago Midway

Thu 10/2

1:08 pm-2:00 pm

2 stops16h 52m

$659

SofiaChicago

SOF - MDW

SOFMDW

Sofia

Tue 10/14

7:00 am-4:09 pm

2 stops17h 09m

Chicago Midway

Fri 11/14

1:47 pm-1:55 pm

2 stops16h 08m

$891

SofiaChicago

SOF - MDW

SOFMDW

Sofia

Sat 11/1

7:00 am-5:55 pm

2 stops17h 55m

Chicago Midway

Sat 11/15

1:47 pm-1:55 pm

2 stops16h 08m

$915

SofiaChicago

SOF - MDW

SOFMDW

Sofia

Tue 10/14

7:00 am-4:09 pm

2 stops17h 09m

Chicago Midway

Tue 12/2

1:14 pm-1:55 pm

2 stops16h 41m

$924

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/11

Showing 1-10 of 32 results
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Best time to book a flight from Sofia to Chicago

Have a flexible travel schedule? Discover the best time to fly to Chicago from Sofia with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from Sofia to Chicago

How far ahead should I book a flight from Sofia to Chicago?

Use this chart to determine the optimal time to book a round-trip flight from Sofia to Chicago. Price data was last updated on August 29, 2025.

The best time to book flights from Sofia to Chicago is 89 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.

What is the cheapest month to book a flight from Sofia to Chicago?

Currently, August is the cheapest month in which you can book a flight from Sofia to Chicago (average of $245). Flying from Sofia to Chicago in March is currently the most expensive (average of $321). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from SOF to CHI?

Find hourly flight availability from Sofia to Chicago. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated September 11, 2025.

A simple way to save on the total cost of your ticket is to fly from Sofia to Chicago in the afternoon. If you’re flexible enough to do this you can expect to save up to 14% on your trip compared to booking a flight in the evening.

Reviews of airlines servicing Chicago

Get insights into the airlines that provide service to Chicago. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Chicago. Reviews last updated September 11, 2025.
Read through reviews of airlines operating flights from Sofia to Chicago, such as KLM, LOT, and United Airlines. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
KLM
7.8
Good
1,385 reviews

Crew

8.4

Overall

7.8

Entertainment

7.2

Comfort

7.7

Food

7.3

Boarding

7.8

Reviews

1 / 20
4.0
Okay

Mark,Sep 2025

AMS - BHX

Crew and snacks were good, boarding wasn't great as busses were used rather than boarding tunnels. Also endured a one hour delay.
KLM
7.8
Good
1,385 reviews
KLM
7.8
Good
1,385 reviews

Crew

8.4

Overall

7.8

Entertainment

7.2

Comfort

7.7

Food

7.3

Boarding

7.8

Reviews

1 / 20
4.0
Okay

Mark,Sep 2025

AMS - BHX

Crew and snacks were good, boarding wasn't great as busses were used rather than boarding tunnels. Also endured a one hour delay.
LOT
7.6
Good
1,114 reviews
KLM
7.8
Good
1,385 reviews

Crew

8.4

Overall

7.8

Entertainment

7.2

Comfort

7.7

Food

7.3

Boarding

7.8

Reviews

1 / 20
4.0
Okay

Mark,Sep 2025

AMS - BHX

Crew and snacks were good, boarding wasn't great as busses were used rather than boarding tunnels. Also endured a one hour delay.
United Airlines
7.4
Good
8,937 reviews
KLM
7.8
Good
1,385 reviews

Crew

8.4

Overall

7.8

Entertainment

7.2

Comfort

7.7

Food

7.3

Boarding

7.8

Reviews

1 / 20
4.0
Okay

Mark,Sep 2025

AMS - BHX

Crew and snacks were good, boarding wasn't great as busses were used rather than boarding tunnels. Also endured a one hour delay.
Turkish Airlines
7.3
Good
3,968 reviews
KLM
7.8
Good
1,385 reviews

Crew

8.4

Overall

7.8

Entertainment

7.2

Comfort

7.7

Food

7.3

Boarding

7.8

Reviews

1 / 20
4.0
Okay

Mark,Sep 2025

AMS - BHX

Crew and snacks were good, boarding wasn't great as busses were used rather than boarding tunnels. Also endured a one hour delay.
Lufthansa
6.8
Okay
7,409 reviews
KLM
7.8
Good
1,385 reviews

Crew

8.4

Overall

7.8

Entertainment

7.2

Comfort

7.7

Food

7.3

Boarding

7.8

Reviews

1 / 20
4.0
Okay

Mark,Sep 2025

AMS - BHX

Crew and snacks were good, boarding wasn't great as busses were used rather than boarding tunnels. Also endured a one hour delay.

Related info for your journey

Find useful and relevant information for your journey from Sofia to Chicago. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly from for flights from Sofia to Chicago?

    Most people fly from Sofia (SOF) if they book a flight from Sofia to Chicago. On average, Sofia has 0 outbound flights to Chicago per day from 7 airlines. Sofia is conveniently located just 4.2 mi from Sofia’s city center.

  • How long is the flight from Sofia to Chicago?

    For as low as $641, LOT can have you in Chicago from Sofia in 33h 25m. There are 5194 mi between Sofia and Chicago.

  • What are the cheapest airlines flying from Sofia to Chicago round-trip?

    Currently priced at $460, KLM will fly you from Sofia to Chicago and back. In addition to KLM, many other airlines offer competitively priced options for your trip. Search Cheapflights for deals from LOT and Air France - these airlines can fly you to your destination from $532 and $560, respectively. KLM is priced at 39% lower than the current average price of a flight leaving 3 months from now.

  • Can I find deals for flights from Sofia to Chicago that include hotel bookings?

    Yes. In addition to deals on Sofia to Chicago flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Sofia to Chicago?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Sofia to Chicago.

  • Can I find deals for business class flights from Sofia to Chicago?

    Yes. Cheapflights offers flight deals from Sofia to Chicago by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from Sofia to Chicago?

    Currently, August is the cheapest month in which you can book a flight from Sofia to Chicago (average of $245). Flying from Sofia to Chicago in March is currently the most expensive (average of $321). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Traveling to a place near Chicago?

Book flights to Chicago if you plan to visit one of these locations
Merrillville
Lansing
Hammond
Benton Harbor
Porter
Chesterton

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Alternative routes for Sofia to Chicago

See prices for flight routes from nearby airports that may be better suited for you.
Sofia to O'Hare Intl flights
Sofia to Midway flights

Top 7 airlines flying from Sofia to Chicago

Discover the top 7 airlines that operate flights from Sofia to Chicago. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated September 11, 2025.
AirlineCheapestAverageFlexibilityOn-time
KLMCheapest$460Average$728FlexibilityNo cancel feeOn-time75%
LOTCheapest$532Average$632FlexibilityNo cancel feeOn-time81%
Air FranceCheapest$560Average$672FlexibilityNo cancel feeOn-time77%
Austrian AirlinesCheapest$576Average$761FlexibilityNo cancel feeOn-time78%
United AirlinesCheapest$603Average$702FlexibilityNo cancel feeOn-time69%
LufthansaCheapest$612Average$759FlexibilityNo cancel feeOn-time76%
Turkish AirlinesCheapest$625Average$709FlexibilityNo cancel feeOn-time77%

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