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$335+ 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 1/11. Fares are subject to change and may not be available on all flights or dates of travel.
SOF — ORD
Oct 11 — Oct 181
Sat 10/11
Sat 10/18
1 adult, Economy
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Cheap flight deals from Sofia to Illinois

Keep the following information in mind while searching for Sofia to Illinois flight deals. Data was 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 Illinois
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One-way flight from Sofia to Illinois
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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 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 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 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 September 11, 2025.
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

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 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, August is the cheapest month in which you can book a flight from Sofia to Illinois (average of $245). Flying from Sofia to Illinois 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 IL?

Find hourly flight availability from Sofia to Illinois. 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.

When flying from Sofia to Illinois, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

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 September 11, 2025.
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
7.8
Good
1,385 reviews

Crew

8.4

Boarding

7.8

Entertainment

7.2

Overall

7.8

Food

7.3

Comfort

7.7

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

Boarding

7.8

Entertainment

7.2

Overall

7.8

Food

7.3

Comfort

7.7

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

Boarding

7.8

Entertainment

7.2

Overall

7.8

Food

7.3

Comfort

7.7

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

Boarding

7.8

Entertainment

7.2

Overall

7.8

Food

7.3

Comfort

7.7

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

Boarding

7.8

Entertainment

7.2

Overall

7.8

Food

7.3

Comfort

7.7

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

Boarding

7.8

Entertainment

7.2

Overall

7.8

Food

7.3

Comfort

7.7

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 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 33h 25m. Fly via LOT to get the fastest option. Airlines will cover a distance of 5194 mi.

  • 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, August is the cheapest month in which you can book a flight from Sofia to Illinois (average of $245). Flying from Sofia to Illinois 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

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Alternative routes for Sofia to Illinois

See prices for flight routes from nearby airports that may be better suited for you.
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Top 7 airlines flying from Sofia to Illinois

Discover the top 7 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 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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