HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Illinois

$351+ 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 6/10. Fares are subject to change and may not be available on all flights or dates of travel.
SOF — ORD
abr. 22 — abr. 291
mar. 4/22
mar. 4/29
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Sofia to Illinois with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

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 abril 17, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$629
(KLM)

One-way from

$351
(Kiwi.com)

Popular in

January

Cheapest in

November

Average price

$679
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 ($22 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease ($13 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in April 2025
Search Deals

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 abril 17, 2025.

This KLM deal was found by Cheapflights users on 4/17. 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.
lun. 4/287:00 amSOF - ORD
2 stops17h 08mKLM
mié. 5/144:50 pmORD - SOF
1 stop13h 10mKLM
Deal found 4/17$629
This Air France deal was found by Cheapflights users on 4/16. 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.
mar. 6/247:00 amSOF - ORD
2 stops18h 46mMultiple Airlines
lun. 7/141:31 pmORD - SOF
2 stops16h 29mMultiple Airlines
Deal found 4/16$630
This FlightHub deal was found by Cheapflights users on 4/17. 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.
vie. 5/235:20 amSOF - ORD
1 stop22h 20mLOT
sáb. 9/139:40 pmORD - SOF
1 stop32h 10mLOT
Deal found 4/17$641
This Air Canada deal was found by Cheapflights users on 4/17. 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.
lun. 5/266:15 amSOF - ORD
2 stops37h 09mAir Canada
vie. 9/1210:40 amORD - SOF
2 stops24h 00mAir Canada
Deal found 4/17$681
This Lufthansa deal was found by Cheapflights users on 4/17. 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.
lun. 5/266:00 amSOF - ORD
1 stop14h 30mLufthansa
mié. 9/109:40 pmORD - SOF
1 stop13h 00mLufthansa
Deal found 4/17$697
This United Airlines deal was found by Cheapflights users on 4/17. 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.
mié. 7/96:15 amSOF - ORD
1 stop16h 40mUnited Airlines
lun. 9/810:40 amORD - SOF
2 stops28h 10mUnited Airlines
Deal found 4/17$700
This FlightHub deal was found by Cheapflights users on 4/17. 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.
dom. 7/279:15 pmSOF - ORD
1 stop20h 25mTurkish Airlines
sáb. 8/911:25 amORD - SOF
1 stop13h 10mTurkish Airlines
Deal found 4/17$718
This SWISS deal was found by Cheapflights users on 4/17. 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 SWISS is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 5/263:30 pmSOF - ORD
1 stop28h 40mSWISS
lun. 9/154:00 pmORD - SOF
2 stops34h 05mSWISS
Deal found 4/17$725
This American Airlines deal was found by Cheapflights users on 4/17. 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.
vie. 6/202:20 pmSOF - ORD
2 stops26h 21mAmerican Airlines
sáb. 7/55:00 pmORD - SOF
2 stops19h 20mAmerican Airlines
Deal found 4/17$776
This British Airways deal was found by Cheapflights users on 4/16. 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.
lun. 4/288:00 pmSOF - ORD
1 stop25h 50mBritish Airways
mié. 5/149:15 pmORD - SOF
1 stop32h 15mBritish Airways
Deal found 4/16$799
This Air France deal was found by Cheapflights users on 4/17. 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.
dom. 5/257:00 amSOF - ORD
1 stop16h 00mAir France
sáb. 9/131:35 pmORD - SOF
2 stops16h 25mAir France
Deal found 4/17$844
This KLM deal was found by Cheapflights users on 4/17. 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.
jue. 6/197:00 amSOF - MDW
2 stops19h 02mKLM
lun. 6/301:09 pmMDW - SOF
2 stops16h 51mKLM
Deal found 4/17$923

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 abril 17, 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

lun. 4/28

7:00 am-4:08 pm

2 stops17h 08m

Chicago O'Hare Intl

mié. 5/14

4:50 pm-2:00 pm

1 stop13h 10m

$629

SofiaChicago

SOF - ORD

SOFORD

Sofia

mar. 6/24

7:00 am-5:46 pm

2 stops18h 46m

Chicago O'Hare Intl

lun. 7/14

1:31 pm-2:00 pm

2 stops16h 29m

$630

SofiaChicago

SOF - ORD

SOFORD

Sofia

vie. 5/23

5:20 am-7:40 pm

1 stop22h 20m

Chicago O'Hare Intl

sáb. 9/13

9:40 pm-1:50 pm

1 stop32h 10m

$641

SofiaChicago

SOF - ORD

SOFORD

Sofia

lun. 5/26

6:15 am-11:24 am

2 stops37h 09m

Chicago O'Hare Intl

vie. 9/12

10:40 am-6:40 pm

2 stops24h 00m

$681

SofiaChicago

SOF - ORD

SOFORD

Sofia

lun. 5/26

6:00 am-12:30 pm

1 stop14h 30m

Chicago O'Hare Intl

mar. 9/9

3:35 pm-12:00 pm

1 stop12h 25m

$697

SofiaChicago

SOF - ORD

SOFORD

Sofia

mié. 7/9

6:15 am-2:55 pm

1 stop16h 40m

Chicago O'Hare Intl

lun. 9/8

10:40 am-10:50 pm

2 stops28h 10m

$700

SofiaChicago

SOF - ORD

SOFORD

Sofia

dom. 7/27

9:15 pm-9:40 am

1 stop20h 25m

Chicago O'Hare Intl

sáb. 8/9

11:25 am-8:35 am

1 stop13h 10m

$718

SofiaChicago

SOF - ORD

SOFORD

Sofia

lun. 5/26

3:30 pm-12:10 pm

1 stop28h 40m

Chicago O'Hare Intl

mar. 9/9

6:00 pm-10:05 am

2 stops32h 05m

$725

SofiaChicago

SOF - ORD

SOFORD

Sofia

vie. 6/20

2:20 pm-8:41 am

2 stops26h 21m

Chicago O'Hare Intl

sáb. 7/5

5:00 pm-8:20 pm

2 stops19h 20m

$776

SofiaChicago

SOF - ORD

SOFORD

Sofia

lun. 4/28

8:00 pm-1:50 pm

1 stop25h 50m

Chicago O'Hare Intl

mié. 5/14

9:15 pm-1:30 pm

1 stop32h 15m

$799

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/17

Showing 1-10 of 21 results
1
2
3

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 abril 17, 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 abril 17, 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
1,327 reviews

Food

7.3

Comfort

7.7

Entertainment

7.1

Boarding

7.8

Overall

7.8

Crew

8.4

Reviews

1 / 20
8.0
Excellent

Anonymous,Mar 2025

LBA - AMS

Overall, the flight from Leeds Bradford to Amsterdam was at expected. The crew were efficient at boarding and professional on board. The only issue was extremely slow check in at Leeds Bradford which was very frustrating.
KLM
7.8
Good
1,327 reviews
KLM
7.8
Good
1,327 reviews

Food

7.3

Comfort

7.7

Entertainment

7.1

Boarding

7.8

Overall

7.8

Crew

8.4

Reviews

1 / 20
8.0
Excellent

Anonymous,Mar 2025

LBA - AMS

Overall, the flight from Leeds Bradford to Amsterdam was at expected. The crew were efficient at boarding and professional on board. The only issue was extremely slow check in at Leeds Bradford which was very frustrating.
LOT
7.6
Good
1,065 reviews
KLM
7.8
Good
1,327 reviews

Food

7.3

Comfort

7.7

Entertainment

7.1

Boarding

7.8

Overall

7.8

Crew

8.4

Reviews

1 / 20
8.0
Excellent

Anonymous,Mar 2025

LBA - AMS

Overall, the flight from Leeds Bradford to Amsterdam was at expected. The crew were efficient at boarding and professional on board. The only issue was extremely slow check in at Leeds Bradford which was very frustrating.
Austrian Airlines
7.6
Good
775 reviews
KLM
7.8
Good
1,327 reviews

Food

7.3

Comfort

7.7

Entertainment

7.1

Boarding

7.8

Overall

7.8

Crew

8.4

Reviews

1 / 20
8.0
Excellent

Anonymous,Mar 2025

LBA - AMS

Overall, the flight from Leeds Bradford to Amsterdam was at expected. The crew were efficient at boarding and professional on board. The only issue was extremely slow check in at Leeds Bradford which was very frustrating.
Air France
7.5
Good
1,435 reviews
KLM
7.8
Good
1,327 reviews

Food

7.3

Comfort

7.7

Entertainment

7.1

Boarding

7.8

Overall

7.8

Crew

8.4

Reviews

1 / 20
8.0
Excellent

Anonymous,Mar 2025

LBA - AMS

Overall, the flight from Leeds Bradford to Amsterdam was at expected. The crew were efficient at boarding and professional on board. The only issue was extremely slow check in at Leeds Bradford which was very frustrating.
SWISS
7.5
Good
1,580 reviews
KLM
7.8
Good
1,327 reviews

Food

7.3

Comfort

7.7

Entertainment

7.1

Boarding

7.8

Overall

7.8

Crew

8.4

Reviews

1 / 20
8.0
Excellent

Anonymous,Mar 2025

LBA - AMS

Overall, the flight from Leeds Bradford to Amsterdam was at expected. The crew were efficient at boarding and professional on board. The only issue was extremely slow check in at Leeds Bradford which was very frustrating.

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 Air Serbia, with whom users have recently found tickets for as low as $417. However, be on the lookout for offers from British Airways and Qatar 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

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.

Alternative routes for Sofia to Illinois

See prices for flight routes from nearby airports that may be better suited for you.
Sofia to John F Kennedy Intl flights
Sofia to LaGuardia flights
Sofia to Newark flights
Sofia to O'Hare Intl flights
Sofia to Boston flights
Sofia to Seattle flights
Sofia to Dulles Intl flights
Sofia to Baltimore flights
Sofia to Los Angeles flights
Sofia to San Francisco flights
Sofia to Ontario flights
Sofia to Hobby flights
Sofia to Midway flights
Sofia to Miami flights
Sofia to Fort Lauderdale flights
Sofia to West Palm Beach flights
Sofia to Santa Ana flights
Sofia to Minneapolis flights
Sofia to Las Vegas flights
Sofia to George Bush Intcntl flights
Sofia to San Jose flights
Sofia to Honolulu flights
Sofia to Denver flights
Sofia to Orlando flights
Sofia to Tampa flights
Sofia to Oakland flights
Sofia to Portland flights
Sofia to Boise flights
Sofia to Kailua-Kona flights
Sofia to Indianapolis flights
Sofia to Detroit flights
Sofia to Buffalo flights
Sofia to Charlotte flights
Sofia to Fayetteville flights
Sofia to Tulsa flights
Sofia to Burbank flights
Sofia to Richmond flights
Sofia to Raleigh flights
Sofia to Providence flights
Sofia to Philadelphia flights
Sofia to Dallas/Fort Worth flights
Sofia to Norfolk flights

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 abril 17, 2025.
AirlineCheapestAverageFlexibilityOn-time
KLMCheapest$460Average$785FlexibilityNo cancel feeOn-time75%
LOTCheapest$496Average$627FlexibilityNo cancel feeOn-time81%
British AirwaysCheapest$546Average$864FlexibilityNo cancel feeOn-time70%
Air FranceCheapest$560Average$672FlexibilityNo cancel feeOn-time77%
Austrian AirlinesCheapest$576Average$733FlexibilityNo cancel feeOn-time78%
LufthansaCheapest$601Average$768FlexibilityNo cancel feeOn-time76%
United AirlinesCheapest$603Average$718FlexibilityNo cancel feeOn-time69%
Turkish AirlinesCheapest$627Average$710FlexibilityNo cancel feeOn-time77%

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.