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$530+ 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 6/20. Fares are subject to change and may not be available on all flights or dates of travel.
SOF — ORD
Jun 17 — Jun 241
Tue 6/17
Tue 6/24
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 June 12, 2025.

Round-trip from

$669
(Air France)

One-way from

$530
(Kiwi.com)

Popular in

May

Cheapest in

November

Average price

$743
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. 6% potential increase in price ($49 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 June 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 June 12, 2025.

This FlightHub deal was found by Cheapflights users on 6/10. 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 6/193:35 pmSOF - ORD
1 stop26h 05mTurkish Airlines
Mon 6/3011:25 amORD - SOF
1 stop13h 10mTurkish Airlines
Deal found 6/10$668
This KLM deal was found by Cheapflights users on 6/11. 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.
Fri 11/217:00 amSOF - ORD
1 stop15h 30mKLM
Sun 12/74:25 pmORD - SOF
1 stop13h 40mKLM
Deal found 6/11$670
This Trip.com deal was found by Cheapflights users on 6/12. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 6/226:00 pmSOF - ORD
1 stop27h 10mITA Airways
Sat 7/193:00 pmORD - SOF
1 stop18h 10mITA Airways
Deal found 6/12$673
This United Airlines deal was found by Cheapflights users on 6/11. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 6/231:50 pmSOF - ORD
2 stops26h 09mUnited Airlines
Tue 7/86:00 pmORD - SOF
1 stop21h 00mUnited Airlines
Deal found 6/11$675
This oojo deal was found by Cheapflights users on 6/12. 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 6/216:40 pmSOF - ORD
1 stop25h 25mLOT
Sat 7/129:40 pmORD - SOF
1 stop12h 15mLOT
Deal found 6/12$678
This Air France deal was found by Cheapflights users on 6/12. 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.
Sat 11/17:00 amSOF - ORD
2 stops16h 34mMultiple Airlines
Sat 12/61:35 pmORD - SOF
2 stops16h 20mMultiple Airlines
Deal found 6/12$679
This British Airways deal was found by Cheapflights users on 6/12. 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.
Mon 6/238:00 pmSOF - ORD
2 stops45h 16mBritish Airways
Sat 7/122:37 pmORD - SOF
2 stops21h 43mBritish Airways
Deal found 6/12$680
This Lufthansa deal was found by Cheapflights users on 6/12. 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 Lufthansa is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/246:20 amSOF - ORD
1 stop16h 35mLufthansa
Sun 7/139:40 pmORD - SOF
1 stop17h 20mLufthansa
Deal found 6/12$687
This Air Canada deal was found by Cheapflights users on 6/12. 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 Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/246:20 amSOF - ORD
2 stops35h 32mAir Canada
Mon 7/149:55 amORD - SOF
2 stops18h 05mAir Canada
Deal found 6/12$694
This Austrian Airlines deal was found by Cheapflights users on 6/12. 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 Austrian Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 6/216:55 pmSOF - ORD
1 stop26h 25mAustrian Airlines
Mon 7/143:55 pmORD - SOF
2 stops18h 15mAustrian Airlines
Deal found 6/12$729
This KLM deal was found by Cheapflights users on 6/9. 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.
Mon 6/307:00 amSOF - MDW
2 stops18h 40mKLM
Sat 11/82:00 pmMDW - SOF
2 stops16h 05mKLM
Deal found 6/9$805
This Air France deal was found by Cheapflights users on 6/12. 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.
Fri 8/17:00 amSOF - MDW
2 stops18h 39mMultiple Airlines
Sat 12/62:00 pmMDW - SOF
2 stops15h 55mMultiple Airlines
Deal found 6/12$1,306

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 June 12, 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

Sat 11/1

7:00 am-3:30 pm

1 stop15h 30m

Chicago O'Hare Intl

Sat 12/6

1:35 pm-1:55 pm

2 stops16h 20m

$669

SofiaChicago

SOF - ORD

SOFORD

Sofia

Fri 11/21

7:00 am-2:30 pm

1 stop15h 30m

Chicago O'Hare Intl

Sun 12/7

4:25 pm-2:05 pm

1 stop13h 40m

$670

SofiaChicago

SOF - ORD

SOFORD

Sofia

Sun 6/22

6:00 pm-1:10 pm

1 stop27h 10m

Chicago O'Hare Intl

Sat 7/19

3:00 pm-5:10 pm

1 stop18h 10m

$673

SofiaChicago

SOF - ORD

SOFORD

Sofia

Mon 6/23

1:50 pm-7:59 am

2 stops26h 09m

Chicago O'Hare Intl

Tue 7/8

6:00 pm-11:00 pm

1 stop21h 00m

$675

SofiaChicago

SOF - ORD

SOFORD

Sofia

Mon 6/23

5:20 am-7:40 pm

1 stop22h 20m

Chicago O'Hare Intl

Mon 7/21

5:10 pm-2:00 am

1 stop24h 50m

$678

SofiaChicago

SOF - ORD

SOFORD

Sofia

Mon 6/23

8:00 pm-9:16 am

2 stops45h 16m

Chicago O'Hare Intl

Sat 7/12

2:37 pm-8:20 pm

2 stops21h 43m

$680

SofiaChicago

SOF - ORD

SOFORD

Sofia

Mon 9/15

7:00 am-5:36 pm

2 stops18h 36m

Chicago O'Hare Intl

Tue 9/30

1:35 pm-2:00 pm

2 stops16h 25m

$684

SofiaChicago

SOF - ORD

SOFORD

Sofia

Tue 6/24

6:20 am-2:55 pm

1 stop16h 35m

Chicago O'Hare Intl

Sun 7/13

9:40 pm-11:00 pm

1 stop17h 20m

$687

SofiaChicago

SOF - ORD

SOFORD

Sofia

Tue 6/24

6:20 am-9:52 am

2 stops35h 32m

Chicago O'Hare Intl

Mon 7/14

9:55 am-12:00 pm

2 stops18h 05m

$694

SofiaChicago

SOF - ORD

SOFORD

Sofia

Sun 6/22

4:05 pm-1:20 pm

1 stop29h 15m

Chicago O'Hare Intl

Tue 7/15

1:05 pm-11:40 am

2 stops14h 35m

$736

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/10

Showing 1-10 of 22 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 June 12, 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.

Rainfall in Illinois by month

Plan your trip to Illinois by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Illinois ranges from 1.7 - 4.9 inches per month. August is typically the wettest month, when rainfall can reach 4.9 in. January is typically the driest time to visit Illinois when rainfall is around 1.7 in.

Temperature in Illinois by month

Plan your trip to Illinois by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Illinois, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 73.4 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 23.0 F).

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 June 12, 2025.
To help decide which airline to fly from Sofia to Illinois, see what other customers have to say about KLM, LOT and Austrian Airlines. In addition to providing an overall rating, users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
KLM
7.8
Good
1,358 reviews

Overall

7.8

Food

7.2

Boarding

7.8

Comfort

7.7

Entertainment

7.1

Crew

8.4

Reviews

1 / 20
8.0
Excellent

Allan,Jun 2025

YYZ - AMS

I always enjoy flying KLM. Service is attentive, friendly and professional. The seat, when fully reclined is a little hard; some kind of mattress or topper would be helpful here. The dinner was really not very good …. “Meatless meatballs” tasted quite peculiar. Breakfast which consisted of an egg white omelette in flour tortilla was also rather tasteless.
KLM
7.8
Good
1,358 reviews
KLM
7.8
Good
1,358 reviews

Overall

7.8

Food

7.2

Boarding

7.8

Comfort

7.7

Entertainment

7.1

Crew

8.4

Reviews

1 / 20
8.0
Excellent

Allan,Jun 2025

YYZ - AMS

I always enjoy flying KLM. Service is attentive, friendly and professional. The seat, when fully reclined is a little hard; some kind of mattress or topper would be helpful here. The dinner was really not very good …. “Meatless meatballs” tasted quite peculiar. Breakfast which consisted of an egg white omelette in flour tortilla was also rather tasteless.
LOT
7.6
Good
1,077 reviews
KLM
7.8
Good
1,358 reviews

Overall

7.8

Food

7.2

Boarding

7.8

Comfort

7.7

Entertainment

7.1

Crew

8.4

Reviews

1 / 20
8.0
Excellent

Allan,Jun 2025

YYZ - AMS

I always enjoy flying KLM. Service is attentive, friendly and professional. The seat, when fully reclined is a little hard; some kind of mattress or topper would be helpful here. The dinner was really not very good …. “Meatless meatballs” tasted quite peculiar. Breakfast which consisted of an egg white omelette in flour tortilla was also rather tasteless.
Austrian Airlines
7.6
Good
802 reviews
KLM
7.8
Good
1,358 reviews

Overall

7.8

Food

7.2

Boarding

7.8

Comfort

7.7

Entertainment

7.1

Crew

8.4

Reviews

1 / 20
8.0
Excellent

Allan,Jun 2025

YYZ - AMS

I always enjoy flying KLM. Service is attentive, friendly and professional. The seat, when fully reclined is a little hard; some kind of mattress or topper would be helpful here. The dinner was really not very good …. “Meatless meatballs” tasted quite peculiar. Breakfast which consisted of an egg white omelette in flour tortilla was also rather tasteless.
Air France
7.5
Good
1,463 reviews
KLM
7.8
Good
1,358 reviews

Overall

7.8

Food

7.2

Boarding

7.8

Comfort

7.7

Entertainment

7.1

Crew

8.4

Reviews

1 / 20
8.0
Excellent

Allan,Jun 2025

YYZ - AMS

I always enjoy flying KLM. Service is attentive, friendly and professional. The seat, when fully reclined is a little hard; some kind of mattress or topper would be helpful here. The dinner was really not very good …. “Meatless meatballs” tasted quite peculiar. Breakfast which consisted of an egg white omelette in flour tortilla was also rather tasteless.
Qatar Airways
7.4
Good
3,584 reviews
KLM
7.8
Good
1,358 reviews

Overall

7.8

Food

7.2

Boarding

7.8

Comfort

7.7

Entertainment

7.1

Crew

8.4

Reviews

1 / 20
8.0
Excellent

Allan,Jun 2025

YYZ - AMS

I always enjoy flying KLM. Service is attentive, friendly and professional. The seat, when fully reclined is a little hard; some kind of mattress or topper would be helpful here. The dinner was really not very good …. “Meatless meatballs” tasted quite peculiar. Breakfast which consisted of an egg white omelette in flour tortilla was also rather tasteless.

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.

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

    The cheapest airline one-way is Qatar Airways, with whom users have recently found tickets for as low as $576. However, be on the lookout for offers from TAP AIR PORTUGAL and British Airways, 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, 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 8 airlines flying from Sofia to Illinois

Discover the top 8 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 June 12, 2025.
AirlineCheapestAverageFlexibilityOn-time
KLMCheapest$485Average$763FlexibilityNo cancel feeOn-time75%
LOTCheapest$532Average$627FlexibilityNo cancel feeOn-time81%
British AirwaysCheapest$546Average$864FlexibilityNo cancel feeOn-time70%
Air FranceCheapest$560Average$672FlexibilityNo cancel feeOn-time77%
Austrian AirlinesCheapest$576Average$773FlexibilityNo cancel feeOn-time78%
United AirlinesCheapest$603Average$702FlexibilityNo cancel feeOn-time69%
LufthansaCheapest$615Average$785FlexibilityNo cancel feeOn-time76%
Turkish AirlinesCheapest$641Average$720FlexibilityNo cancel feeOn-time77%

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