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$359+ 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 2/18. Fares are subject to change and may not be available on all flights or dates of travel.
SOF — ORD
Feb 4 — Feb 111
Tue 2/4
Tue 2/11
1 adult, Economy
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Cheap flight deals from Sofia to Illinois

Discover tips and strategies to find the most affordable flight options for your journey from Sofia (SOF) to Illinois (USIL). 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 January 30, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$571
(oojo)

Popular in

July

Cheapest in

April

Average price

$774
Provider with most accurate pricing for Sofia-Chicago (CHI) flight deals.
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Provider most trusted by Cheapflights users for Sofia-Chicago (CHI) flights.
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From Sofia to Illinois
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Highest demand for flights based on searches. 8% potential increase in price ($63 potential increase over avg. RT price).
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Cheapest flight prices on average. 1% potential price decrease ($11 potential savings vs. average RT price).
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Average for round-trip flights in January 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 January 30, 2025.

This oojo deal was found by Cheapflights users on 1/30. 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 2/272:25 pmSOF - ORD
1 stop13h 35mLOT
Wed 3/1210:55 pmORD - SOF
1 stop11h 55mLOT
Deal found 1/30$571
This American Airlines deal was found by Cheapflights users on 1/30. 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.
Mon 2/175:25 pmSOF - ORD
1 stop28h 30mAmerican Airlines
Sun 3/22:55 pmORD - SOF
2 stops17h 25mAmerican Airlines
Deal found 1/30$598
This United Airlines deal was found by Cheapflights users on 1/29. 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.
Tue 4/16:20 amSOF - ORD
2 stops16h 30mUnited Airlines
Tue 4/157:10 amORD - SOF
2 stops31h 50mUnited Airlines
Deal found 1/29$623
This Expedia deal was found by Cheapflights users on 1/30. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/173:00 pmSOF - ORD
1 stop33h 15mSWISS
Wed 3/268:05 pmORD - SOF
1 stop12h 10mSWISS
Deal found 1/30$629
This Expedia deal was found by Cheapflights users on 1/30. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/108:00 amSOF - ORD
1 stop13h 20mAustrian Airlines
Thu 4/244:20 pmORD - SOF
1 stop11h 20mAustrian Airlines
Deal found 1/30$633
This Gotogate deal was found by Cheapflights users on 1/30. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 2/171:45 pmSOF - ORD
1 stop12h 40mLufthansa
Sun 3/29:25 pmORD - SOF
1 stop17h 20mLufthansa
Deal found 1/30$639
This Expedia deal was found by Cheapflights users on 1/30. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/173:00 pmSOF - ORD
1 stop33h 15mMultiple Airlines
Sun 3/309:40 pmORD - SOF
1 stop17h 20mMultiple Airlines
Deal found 1/30$642
This Air Canada deal was found by Cheapflights users on 1/30. 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.
Thu 4/106:15 amSOF - ORD
2 stops21h 45mAir Canada
Tue 4/227:20 amORD - SOF
2 stops26h 30mAir Canada
Deal found 1/30$655
This KLM deal was found by Cheapflights users on 1/30. 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.
Sun 2/237:00 amSOF - ORD
2 stops18h 29mKLM
Sun 3/212:15 pmORD - SOF
2 stops17h 50mKLM
Deal found 1/30$663
This KLM deal was found by Cheapflights users on 1/30. 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.
Thu 2/67:00 amSOF - MDW
2 stops18h 43mKLM
Sat 4/51:12 pmMDW - SOF
2 stops16h 48mKLM
Deal found 1/30$669
This British Airways deal was found by Cheapflights users on 1/30. 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 2/35:25 pmSOF - ORD
1 stop28h 30mBritish Airways
Tue 2/185:00 pmORD - SOF
1 stop13h 10mBritish Airways
Deal found 1/30$689
This Turkish Airlines deal was found by Cheapflights users on 1/30. 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.
Thu 4/109:15 amSOF - ORD
1 stop16h 40mTurkish Airlines
Fri 4/257:50 pmORD - SOF
1 stop16h 35mTurkish Airlines
Deal found 1/30$707

Find flights from Sofia to Illinois within your budget

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 January 30, 2025.

Fly from

Any airport

Fly to

Any airport

Route

Depart

Return

Price

SofiaChicago

SOF - ORD

SOFORD

Sofia

Thu 2/27

2:25 pm-8:00 pm

1 stop13h 35m

Chicago O'Hare Intl

Wed 3/12

10:55 pm-5:50 pm

1 stop11h 55m

$571

SofiaChicago

SOF - ORD

SOFORD

Sofia

Mon 2/17

5:25 pm-1:55 pm

1 stop28h 30m

Chicago O'Hare Intl

Sun 3/2

2:55 pm-4:20 pm

2 stops17h 25m

$598

SofiaChicago

SOF - ORD

SOFORD

Sofia

Tue 4/1

6:20 am-2:50 pm

2 stops16h 30m

Chicago O'Hare Intl

Tue 4/15

7:10 am-11:00 pm

2 stops31h 50m

$623

SofiaChicago

SOF - ORD

SOFORD

Sofia

Mon 3/17

3:00 pm-5:15 pm

1 stop33h 15m

Chicago O'Hare Intl

Wed 3/26

8:05 pm-3:15 pm

1 stop12h 10m

$629

SofiaChicago

SOF - ORD

SOFORD

Sofia

Thu 4/10

8:00 am-1:20 pm

1 stop13h 20m

Chicago O'Hare Intl

Thu 4/24

4:20 pm-11:40 am

1 stop11h 20m

$633

SofiaChicago

SOF - ORD

SOFORD

Sofia

Mon 2/17

1:45 pm-6:25 pm

1 stop12h 40m

Chicago O'Hare Intl

Sun 3/2

9:25 pm-10:45 pm

1 stop17h 20m

$639

SofiaChicago

SOF - ORD

SOFORD

Sofia

Mon 3/17

3:00 pm-5:15 pm

1 stop33h 15m

Chicago O'Hare Intl

Sun 3/30

9:40 pm-11:00 pm

1 stop17h 20m

$642

SofiaChicago

SOF - ORD

SOFORD

Sofia

Thu 4/10

6:15 am-8:00 pm

2 stops21h 45m

Chicago O'Hare Intl

Tue 4/22

7:20 am-5:50 pm

2 stops26h 30m

$655

SofiaChicago

SOF - ORD

SOFORD

Sofia

Sun 2/23

7:00 am-5:29 pm

2 stops18h 29m

Chicago O'Hare Intl

Sun 3/2

12:15 pm-2:05 pm

2 stops17h 50m

$663

SofiaChicago

SOF - ORD

SOFORD

Sofia

Mon 2/3

5:25 pm-1:55 pm

1 stop28h 30m

Chicago O'Hare Intl

Tue 2/18

5:00 pm-2:10 pm

1 stop13h 10m

$689

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/30

Showing 1-10 of 16 results
1
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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.

Travel insights for flights from Sofia to Illinois

Get recent, data-driven insights about flights from Sofia to Illinois including ideal travel times, pricing trends, and more.

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 $325). 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 January 30, 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 January 30, 2025.
To help decide which airline to fly from Sofia to Illinois, see what other customers have to say about KLM, LOT and Qatar Airways. 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
1,335 reviews

Overall

7.8

Comfort

7.7

Boarding

7.8

Crew

8.4

Food

7.3

Entertainment

7.2

Reviews

1 / 20

8.0
Excellent

Anonymous,Dec 2024

YWG - YYZ

I could not select a seat prior to check in as systems not integrated. Different PNRs should be on reservation which would make process easier.

KLM
7.8
Good
1,335 reviews
KLM
7.8
Good
1,335 reviews

Overall

7.8

Comfort

7.7

Boarding

7.8

Crew

8.4

Food

7.3

Entertainment

7.2

Reviews

1 / 20

8.0
Excellent

Anonymous,Dec 2024

YWG - YYZ

I could not select a seat prior to check in as systems not integrated. Different PNRs should be on reservation which would make process easier.

LOT
7.6
Good
1,097 reviews
KLM
7.8
Good
1,335 reviews

Overall

7.8

Comfort

7.7

Boarding

7.8

Crew

8.4

Food

7.3

Entertainment

7.2

Reviews

1 / 20

8.0
Excellent

Anonymous,Dec 2024

YWG - YYZ

I could not select a seat prior to check in as systems not integrated. Different PNRs should be on reservation which would make process easier.

Qatar Airways
7.5
Good
3,718 reviews
KLM
7.8
Good
1,335 reviews

Overall

7.8

Comfort

7.7

Boarding

7.8

Crew

8.4

Food

7.3

Entertainment

7.2

Reviews

1 / 20

8.0
Excellent

Anonymous,Dec 2024

YWG - YYZ

I could not select a seat prior to check in as systems not integrated. Different PNRs should be on reservation which would make process easier.

Austrian Airlines
7.5
Good
786 reviews
KLM
7.8
Good
1,335 reviews

Overall

7.8

Comfort

7.7

Boarding

7.8

Crew

8.4

Food

7.3

Entertainment

7.2

Reviews

1 / 20

8.0
Excellent

Anonymous,Dec 2024

YWG - YYZ

I could not select a seat prior to check in as systems not integrated. Different PNRs should be on reservation which would make process easier.

SWISS
7.5
Good
1,584 reviews
KLM
7.8
Good
1,335 reviews

Overall

7.8

Comfort

7.7

Boarding

7.8

Crew

8.4

Food

7.3

Entertainment

7.2

Reviews

1 / 20

8.0
Excellent

Anonymous,Dec 2024

YWG - YYZ

I could not select a seat prior to check in as systems not integrated. Different PNRs should be on reservation which would make process easier.

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.

  • 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 $325). 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 January 30, 2025.
AirlineCheapestAverageFlexibilityOn-time
KLMCheapest$460Average$807FlexibilityNo cancel feeOn-time75%
LOTCheapest$518Average$631FlexibilityNo cancel feeOn-time81%
British AirwaysCheapest$546Average$795FlexibilityNo cancel feeOn-time70%
Austrian AirlinesCheapest$576Average$774FlexibilityNo cancel feeOn-time78%
LufthansaCheapest$585Average$785FlexibilityNo cancel feeOn-time76%
United AirlinesCheapest$603Average$768FlexibilityNo cancel feeOn-time69%
ITA AirwaysCheapest$631Average$688FlexibilityNo cancel feeOn-time81%
Turkish AirlinesCheapest$641Average$729FlexibilityNo cancel feeOn-time77%
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