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$313+ Cheap flights from Sofia (SOF) to Illinois

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 4/16. Fares are subject to change and may not be available on all flights or dates of travel.
SOF — ORD
Mar 10 — Mar 171
Tue 3/10
Tue 3/17
1 adult, Economy
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Cheap flight deals from Sofia to Illinois

Cheapest flights from Sofia to Illinois
Explore the most affordable flight options available from Sofia to Illinois. Find the lowest fares from popular airlines and budget airlines, with prices last updated on February 8, 2026.

This FlightHub deal was found by Cheapflights users on 2/6. 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.
Sat 4/183:50 pm
SOF
-
ORD
1 stop25h 50m
Turkish Airlines
Thu 4/238:10 pm
ORD
-
SOF
1 stop34h 50m
Turkish Airlines
Deal found 2/6$649
This oojo deal was found by Cheapflights users on 2/7. 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.
Thu 4/235:25 am
SOF
-
ORD
1 stop22h 25m
LOT
Fri 8/285:10 pm
ORD
-
SOF
2 stops36h 45m
LOT
Deal found 2/7$655
This FlightHub deal was found by Cheapflights users on 2/5. 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.
Sun 2/226:35 pm
SOF
-
ORD
2 stops33h 20m
LOT
Tue 3/1010:55 pm
ORD
-
SOF
1 stop31h 55m
LOT
Deal found 2/5$658
This Kiwi.com deal was found by Cheapflights users on 2/5. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 2/196:35 pm
SOF
-
ORD
1 stop33h 25m
LOT
Mon 3/1610:55 pm
ORD
-
SOF
1 stop11h 55m
LOT
Deal found 2/5$662
This FlightHub deal was found by Cheapflights users on 2/5. 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.
Fri 4/249:05 pm
SOF
-
ORD
1 stop20h 35m
Turkish Airlines
Fri 5/111:25 am
ORD
-
SOF
1 stop13h 20m
Turkish Airlines
Deal found 2/5$663
This Kiwi.com deal was found by Cheapflights users on 2/6. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 3/82:35 pm
SOF
-
ORD
1 stop13h 25m
LOT
Sat 4/189:50 pm
ORD
-
SOF
1 stop12h 10m
LOT
Deal found 2/6$665
This KAYAK deal was found by Cheapflights users on 2/5. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/249:05 pm
SOF
-
ORD
1 stop20h 35m
Turkish Airlines
Thu 4/308:10 pm
ORD
-
SOF
1 stop16h 05m
Turkish Airlines
Deal found 2/5$673
This FlightHub deal was found by Cheapflights users on 2/5. 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 2/196:35 pm
SOF
-
ORD
1 stop33h 25m
LOT
Mon 3/910:55 pm
ORD
-
SOF
1 stop31h 55m
LOT
Deal found 2/5$674
This FlightHub deal was found by Cheapflights users on 2/7. 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.
Wed 6/33:50 pm
SOF
-
ORD
1 stop25h 50m
Turkish Airlines
Thu 7/1611:25 am
ORD
-
SOF
1 stop19h 35m
Turkish Airlines
Deal found 2/7$676
This LOT deal was found by Cheapflights users on 2/5. 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 3/42:35 pm
SOF
-
ORD
1 stop13h 25m
LOT
Tue 3/1010:55 pm
ORD
-
SOF
1 stop31h 55m
LOT
Deal found 2/5$680
This LOT deal was found by Cheapflights users on 2/6. 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.
Fri 3/132:35 pm
SOF
-
ORD
1 stop13h 25m
LOT
Sun 4/199:50 pm
ORD
-
SOF
1 stop12h 10m
LOT
Deal found 2/6$681
This Turkish Airlines deal was found by Cheapflights users on 2/5. 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 Turkish Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/229:05 pm
SOF
-
ORD
1 stop20h 35m
Turkish Airlines
Mon 4/2711:25 am
ORD
-
SOF
1 stop19h 35m
Turkish Airlines
Deal found 2/5$682

Find flight deals from Sofia to Illinois

Keep the following information in mind while searching for Sofia to Illinois flight deals. Data was last updated February 8, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$649
(FlightHub)

One-way from

$313
(Kiwi.com)

Popular in

May

Cheapest in

April

Average price

$690
Provider with most accurate pricing for Sofia-Chicago (CHI) flight deals.
Search Deals
Provider most trusted by Cheapflights users for Sofia-Chicago (CHI) flights.
Search Deals
From Sofia to Illinois
Search Deals
One-way flight from Sofia to Illinois
Search Deals
Highest demand for flights based on searches. 2% potential increase in price ($20 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($18 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in February 2026
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Sofia to Illinois 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 February 8, 2026.
Use the filters below to find and compare flights from Sofia to Illinois that are best for you.

Fly from

Sofia

Fly to

Illinois

Route

Depart

Return

Price

SofiaChicago

SOF - ORD

SOFORD

Sofia

Sat 3/7

2:35 pm-8:00 pm

1 stop13h 25m

Chicago O'Hare Intl

Sun 4/19

9:50 pm-6:00 pm

1 stop12h 10m

$680

SofiaChicago

SOF - ORD

SOFORD

Sofia

Fri 3/13

2:35 pm-9:00 pm

1 stop13h 25m

Chicago O'Hare Intl

Sun 4/19

9:50 pm-6:00 pm

1 stop12h 10m

$680

SofiaChicago

SOF - ORD

SOFORD

Sofia

Sat 3/7

2:35 pm-8:00 pm

1 stop13h 25m

Chicago O'Hare Intl

Fri 4/17

9:50 pm-6:00 pm

1 stop12h 10m

$680

SofiaChicago

SOF - ORD

SOFORD

Sofia

Mon 4/27

9:35 am-6:15 pm

1 stop16h 40m

Chicago O'Hare Intl

Thu 4/30

11:25 am-1:15 pm

1 stop17h 50m

$682

SofiaChicago

SOF - ORD

SOFORD

Sofia

Mon 4/27

9:35 am-6:15 pm

1 stop16h 40m

Chicago O'Hare Intl

Wed 4/29

8:10 pm-8:15 pm

1 stop16h 05m

$682

SofiaChicago

SOF - ORD

SOFORD

Sofia

Mon 4/27

9:35 am-6:15 pm

1 stop16h 40m

Chicago O'Hare Intl

Fri 5/1

11:25 am-3:00 pm

1 stop19h 35m

$682

SofiaChicago

SOF - ORD

SOFORD

Sofia

Wed 4/22

9:05 pm-9:40 am

1 stop20h 35m

Chicago O'Hare Intl

Tue 4/28

11:25 am-3:00 pm

1 stop19h 35m

$682

SofiaChicago

SOF - ORD

SOFORD

Sofia

Mon 4/27

9:35 am-6:15 pm

1 stop16h 40m

Chicago O'Hare Intl

Sun 5/3

11:25 am-8:45 am

1 stop13h 20m

$682

SofiaChicago

SOF - ORD

SOFORD

Sofia

Mon 4/27

9:35 am-6:15 pm

1 stop16h 40m

Chicago O'Hare Intl

Sat 5/2

11:25 am-8:45 am

1 stop13h 20m

$682

SofiaChicago

SOF - ORD

SOFORD

Sofia

Sun 3/1

7:00 am-2:20 pm

1 stop15h 20m

Chicago O'Hare Intl

Mon 4/13

5:10 pm-2:00 pm

1 stop12h 50m

$727

Flights are sorted by cheapest round-trip flights first.

Deals found on 2/6

Showing 1-10 of 42 results
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Best time to book a flight from Sofia to Illinois

Have a flexible travel schedule? Discover the best time to fly to Illinois 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 Illinois

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

Currently, November is the cheapest month in which you can book a flight from Sofia to Illinois (average of $527). Flying from Sofia to Illinois in August is currently the most expensive (average of $670). 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.

How much does it cost to fly round-trip from Sofia to Illinois?

Reviews of airlines servicing Illinois

Get insights into the airlines that provide service to Illinois. 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 Illinois. Reviews last updated February 8, 2026.
See what other customers who have flown with KLM, LOT, and United Airlines from Sofia to Illinois have to say. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
KLM
7.7
Good
1,450 reviews

Overall

7.7

Entertainment

7.1

Food

7.3

Crew

8.4

Boarding

7.8

Comfort

7.6

Reviews

1 / 20
10.0
Excellent

Snapyou,Jan 2026

TPA - LHR

Flight operated by Virgin Atlantic - usual high standard service by Virgin.
KLM
7.7
Good
1,450 reviews
KLM
7.7
Good
1,450 reviews

Overall

7.7

Entertainment

7.1

Food

7.3

Crew

8.4

Boarding

7.8

Comfort

7.6

Reviews

1 / 20
10.0
Excellent

Snapyou,Jan 2026

TPA - LHR

Flight operated by Virgin Atlantic - usual high standard service by Virgin.
LOT
7.5
Good
1,179 reviews
KLM
7.7
Good
1,450 reviews

Overall

7.7

Entertainment

7.1

Food

7.3

Crew

8.4

Boarding

7.8

Comfort

7.6

Reviews

1 / 20
10.0
Excellent

Snapyou,Jan 2026

TPA - LHR

Flight operated by Virgin Atlantic - usual high standard service by Virgin.
United Airlines
7.4
Good
9,254 reviews
KLM
7.7
Good
1,450 reviews

Overall

7.7

Entertainment

7.1

Food

7.3

Crew

8.4

Boarding

7.8

Comfort

7.6

Reviews

1 / 20
10.0
Excellent

Snapyou,Jan 2026

TPA - LHR

Flight operated by Virgin Atlantic - usual high standard service by Virgin.
Turkish Airlines
7.3
Good
4,207 reviews
KLM
7.7
Good
1,450 reviews

Overall

7.7

Entertainment

7.1

Food

7.3

Crew

8.4

Boarding

7.8

Comfort

7.6

Reviews

1 / 20
10.0
Excellent

Snapyou,Jan 2026

TPA - LHR

Flight operated by Virgin Atlantic - usual high standard service by Virgin.
Lufthansa
6.8
Okay
7,773 reviews
KLM
7.7
Good
1,450 reviews

Overall

7.7

Entertainment

7.1

Food

7.3

Crew

8.4

Boarding

7.8

Comfort

7.6

Reviews

1 / 20
10.0
Excellent

Snapyou,Jan 2026

TPA - LHR

Flight operated by Virgin Atlantic - usual high standard service by Virgin.

Related info for your journey

Find useful and relevant information for your journey from Sofia to Illinois. 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 Illinois?

    Most people fly from Sofia (SOF) if they book a flight from Sofia to Illinois. Sofia is conveniently located just 4.2 mi from Sofia’s city center.

  • How long is the flight from Sofia to Illinois?

    There are many flights that can get you from Sofia to Illinois in 13h 25m. Fly via LOT or Turkish Airlines to get the fastest option. Airlines will cover a distance of 5194 mi. This flight may include one or multiple stops.

  • What are the cheapest airlines to fly from Sofia to Illinois one-way?

    The cheapest airline one-way is Air Serbia, with whom users have recently found tickets for as low as $374. However, be on the lookout for offers from Turkish Airlines and Austrian Airlines, as they are both options that can get you from Sofia to Illinois for a low price.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from Sofia to Illinois 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 Illinois?

    Currently, November is the cheapest month in which you can book a flight from Sofia to Illinois (average of $527). Flying from Sofia to Illinois in August is currently the most expensive (average of $670). 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

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Top 6 airlines flying from Sofia to Illinois

Discover the top 6 airlines that operate flights from Sofia to Illinois. 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 February 8, 2026.
AirlineCheapestAverageFlexibilityOn-time
LOTCheapest$593Average$700FlexibilityNo cancel feeOn-time81%
KLMCheapest$621Average$760FlexibilityNo cancel feeOn-time75%
Turkish AirlinesCheapest$625Average$735FlexibilityNo cancel feeOn-time77%
United AirlinesCheapest$649Average$766FlexibilityNo cancel feeOn-time69%
LufthansaCheapest$653Average$786FlexibilityNo cancel feeOn-time76%
Austrian AirlinesCheapest$658Average$797FlexibilityNo cancel feeOn-time78%

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