$297+ Cheap flights from Illinois to Sofia (SOF)
This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 10/27. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — SOF
Nov 1 — Nov 81
Round-trip
1 adult, Economy
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Find cheap flights from Illinois to Sofia 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 Illinois to Sofia
Cheapest
Best
Last-minute
One-way
Cheapest flights from Illinois to SofiaExplore the most affordable flight options available from Illinois to Sofia. Find the lowest fares from popular airlines and budget airlines, with prices last updated on October 2, 2026.
Explore the most affordable flight options available from Illinois to Sofia. Find the lowest fares from popular airlines and budget airlines, with prices last updated on October 2, 2026.
This Mytrip deal was found by Cheapflights users on 10/1. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/68:10 pm -
2 stops21h 00m
Tue 11/175:25 pm -
2 stops30h 05m
Deal found 10/1![Multiple Airlines logo]()
$706
This Justfly.com deal was found by Cheapflights users on 9/30. 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 Justfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/3012:45 pm -
1 stop25h 05m
Fri 11/69:40 pm -
1 stop21h 20m
Deal found 9/30![Turkish Airlines logo]()
$711
This Expedia deal was found by Cheapflights users on 9/29. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/299:50 pm -
2 stops17h 10m
Tue 1/126:25 am -
1 stop14h 45m
Deal found 9/29![Lufthansa logo]()
$712
This Mytrip deal was found by Cheapflights users on 9/30. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/186:00 pm -
2 stops23h 30m
Tue 11/35:25 pm -
2 stops30h 05m
Deal found 9/30![Multiple Airlines logo]()
$718
This United Airlines deal was found by Cheapflights users on 9/29. 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 12/299:47 pm -
2 stops31h 28m
Tue 1/126:25 am -
2 stops20h 35m
Deal found 9/29![United Airlines logo]()
$722
This FlightHub deal was found by Cheapflights users on 9/30. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/128:10 pm -
1 stop16h 10m
Thu 10/229:10 pm -
1 stop20h 30m
Deal found 9/30![Turkish Airlines logo]()
$723
This FlightHub deal was found by Cheapflights users on 9/30. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/228:15 pm -
1 stop34h 55m
Thu 3/189:30 am -
1 stop16h 50m
Deal found 9/30![Turkish Airlines logo]()
$725
This FlightHub deal was found by Cheapflights users on 9/28. 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 10/309:15 pm -
1 stop28h 25m
Fri 11/139:30 am -
1 stop16h 50m
Deal found 9/28![Turkish Airlines logo]()
$726
This Expedia deal was found by Cheapflights users on 9/28. 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 12/288:50 pm -
2 stops37h 10m
Mon 1/112:00 pm -
2 stops35h 43m
Deal found 9/28![Multiple Airlines logo]()
$727
This Justfly.com deal was found by Cheapflights users on 9/30. 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 Justfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/112:45 pm -
1 stop11h 55m
Sun 11/154:00 pm -
1 stop26h 00m
Deal found 9/30![Turkish Airlines logo]()
$729
This Expedia deal was found by Cheapflights users on 10/1. 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 12/319:50 pm -
1 stop12h 30m
Thu 1/146:25 am -
1 stop14h 45m
Deal found 10/1![Lufthansa logo]()
$730
This FlightHub deal was found by Cheapflights users on 9/29. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/138:10 pm -
1 stop16h 10m
Wed 5/59:05 pm -
1 stop20h 35m
Deal found 9/29![Turkish Airlines logo]()
$731
Best flights from Illinois to SofiaDiscover carefully curated flight deals from Illinois to Sofia that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated October 2, 2026.
Discover carefully curated flight deals from Illinois to Sofia that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated October 2, 2026.
This United Airlines deal was found by Cheapflights users on 9/29. 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.
Sat 2/278:50 pm -
2 stops42h 05m
Sat 3/136:25 am -
1 stop14h 45m
Deal found 9/29![United Airlines logo]()
$765
This United deal was found by Cheapflights users on 10/1. 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 is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/911:56 am -
2 stops17h 19m
Wed 11/182:10 pm -
1 stop13h 55m
Deal found 10/1![Multiple Airlines logo]()
$782
This British Airways deal was found by Cheapflights users on 9/29. 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 British Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/238:45 pm -
2 stops39h 25m
Wed 12/29:05 pm -
2 stops30h 38m
Deal found 9/29![British Airways logo]()
$797
This United Airlines deal was found by Cheapflights users on 9/29. 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.
Wed 11/1111:56 am -
2 stops17h 19m
Thu 4/16:20 am -
1 stop14h 35m
Deal found 9/29![United Airlines logo]()
$783
This United deal was found by Cheapflights users on 9/28. 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 is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 1/36:50 am -
2 stops21h 00m
Sat 1/236:25 am -
2 stops36h 42m
Deal found 9/28![Multiple Airlines logo]()
$784
This United Airlines deal was found by Cheapflights users on 10/2. 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 11/3012:59 pm -
2 stops16h 16m
Wed 12/96:25 am -
2 stops16h 27m
Deal found 10/2![United Airlines logo]()
$785
This United Airlines deal was found by Cheapflights users on 10/1. 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 11/912:59 pm -
2 stops16h 16m
Wed 11/186:25 am -
2 stops20h 40m
Deal found 10/1![United Airlines logo]()
$790
This United Airlines deal was found by Cheapflights users on 10/1. 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.
Fri 10/307:00 pm -
1 stop20h 55m
Fri 11/66:25 am -
2 stops36h 42m
Deal found 10/1![United Airlines logo]()
$831
This United Airlines deal was found by Cheapflights users on 9/28. 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 11/171:30 pm -
2 stops15h 45m
Tue 12/16:25 am -
2 stops16h 27m
Deal found 9/28![United Airlines logo]()
$842
Last-minute flights from Illinois to SofiaDiscover last-minute flight deals from Illinois to Sofia. Data last updated October 2, 2026 and is based on user searches.
Discover last-minute flight deals from Illinois to Sofia. Data last updated October 2, 2026 and is based on user searches.
This FlightHub deal was found by Cheapflights users on 9/30. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/128:10 pm -
1 stop16h 10m
Thu 10/229:10 pm -
1 stop20h 30m
Deal found 9/30![Turkish Airlines logo]()
$723
This FlightHub deal was found by Cheapflights users on 9/29. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/138:10 pm -
1 stop16h 10m
Wed 5/59:05 pm -
1 stop20h 35m
Deal found 9/29![Turkish Airlines logo]()
$731
This Justfly.com deal was found by Cheapflights users on 9/30. 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 Justfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/138:10 pm -
1 stop34h 50m
Mon 10/199:10 pm -
1 stop20h 30m
Deal found 9/30![Turkish Airlines logo]()
$733
This Mytrip deal was found by Cheapflights users on 9/30. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/186:00 pm -
2 stops23h 30m
Tue 11/35:25 pm -
2 stops30h 05m
Deal found 9/30![Multiple Airlines logo]()
$718
This CheapOair deal was found by Cheapflights users on 9/29. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/218:10 pm -
1 stop28h 35m
Mon 11/99:30 am -
1 stop16h 50m
Deal found 9/29![Turkish Airlines logo]()
$739
This Justfly.com deal was found by Cheapflights users on 9/30. 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 Justfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/3012:45 pm -
1 stop25h 05m
Fri 11/69:40 pm -
1 stop21h 20m
Deal found 9/30![Turkish Airlines logo]()
$711
This FlightHub deal was found by Cheapflights users on 9/28. 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 10/309:15 pm -
1 stop28h 25m
Fri 11/139:30 am -
1 stop16h 50m
Deal found 9/28![Turkish Airlines logo]()
$726
This Justfly.com deal was found by Cheapflights users on 9/30. 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 Justfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/112:45 pm -
1 stop11h 55m
Sun 11/154:00 pm -
1 stop26h 00m
Deal found 9/30![Turkish Airlines logo]()
$729
This Mytrip deal was found by Cheapflights users on 10/1. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/68:10 pm -
2 stops21h 00m
Tue 11/175:25 pm -
2 stops30h 05m
Deal found 10/1![Multiple Airlines logo]()
$706
This Mytrip deal was found by Cheapflights users on 10/1. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/147:10 pm -
2 stops35h 00m
Sat 11/215:00 am -
2 stops19h 45m
Deal found 10/1![Multiple Airlines logo]()
$736
This FlightHub deal was found by Cheapflights users on 9/30. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/228:15 pm -
1 stop34h 55m
Thu 3/189:30 am -
1 stop16h 50m
Deal found 9/30![Turkish Airlines logo]()
$725
One-way flights from Illinois to SofiaSearch for one-way flight options from Illinois to Sofia. Find affordable one-way fares based on user searches. Data last updated October 2, 2026.
Search for one-way flight options from Illinois to Sofia. Find affordable one-way fares based on user searches. Data last updated October 2, 2026.
This Kiwi.com deal was found by Cheapflights users on 10/1. 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.
Tue 10/277:30 pm -
2 stops32h 05m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/1![Multiple Airlines logo]()
$297
This Kiwi.com deal was found by Cheapflights users on 10/1. 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.
Tue 1/126:30 pm -
2 stops32h 05m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/1![Multiple Airlines logo]()
$303
This Kiwi.com deal was found by Cheapflights users on 10/1. 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.
Fri 1/86:30 pm -
2 stops31h 30m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/1![Multiple Airlines logo]()
$306
This Kiwi.com deal was found by Cheapflights users on 9/30. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/267:30 pm -
3 stops31h 00m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/30![Multiple Airlines logo]()
$314
This Kiwi.com deal was found by Cheapflights users on 10/1. 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 1/76:30 pm -
3 stops22h 05m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/1![Multiple Airlines logo]()
$315
This Kiwi.com deal was found by Cheapflights users on 9/30. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 1/156:30 pm -
2 stops31h 30m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/30![Multiple Airlines logo]()
$316
This Expedia deal was found by Cheapflights users on 10/1. 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.
Sun 1/103:17 pm -
2 stops17h 03m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/1![British Airways logo]()
$318
This Kiwi.com deal was found by Cheapflights users on 10/1. 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 1/106:30 pm -
3 stops32h 50m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/1![Multiple Airlines logo]()
$319
This Kiwi.com deal was found by Cheapflights users on 9/30. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/287:30 pm -
3 stops32h 20m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/30![Multiple Airlines logo]()
$331
Find flight deals from Illinois to Sofia
Keep the following information in mind while searching for Illinois to Sofia flight deals. Data was last updated October 2, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $706 (Mytrip) |
One-way from | $297 (Kiwi.com) |
Popular in | July |
Cheapest in | February |
Average price | $780 |
Cheapflights Fare Finder
Customize your flight search to find flights from Illinois to Sofia 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 7,457,451 searches. Data last updated October 2, 2026.
Use the filters below to find and compare flights from Illinois to Sofia that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
ChicagoSofia
ORD Chicago O'Hare Intl - SOF Sofia
ORDSOF
Chicago O'Hare Intl
Tue 12/29
6:30 pm-5:50 pm
3 stops39h 20m
Sofia
Wed 12/31
12:00 am-4:00 pm
Nonstop0h 00m
$338
ChicagoSofia
ORD Chicago O'Hare Intl - SOF Sofia
ORDSOF
Chicago O'Hare Intl
Tue 12/29
4:29 pm-8:10 pm
2 stops19h 41m
Sofia
Wed 12/31
12:00 am-4:00 pm
Nonstop0h 00m
$339
ChicagoSofia
ORD Chicago O'Hare Intl - SOF Sofia
ORDSOF
Chicago O'Hare Intl
Tue 12/29
9:50 pm-1:15 pm
1 stop31h 25m
Sofia
Wed 12/31
12:00 am-4:00 pm
Nonstop0h 00m
$356
ChicagoSofia
ORD Chicago O'Hare Intl - SOF Sofia
ORDSOF
Chicago O'Hare Intl
Fri 1/1
6:00 pm-10:55 pm
1 stop20h 55m
Sofia
Wed 12/31
12:00 am-4:00 pm
Nonstop0h 00m
$382
ChicagoSofia
ORD Chicago O'Hare Intl - SOF Sofia
ORDSOF
Chicago O'Hare Intl
Fri 1/8
4:20 pm-1:25 pm
1 stop13h 05m
Sofia
Wed 12/31
12:00 am-4:00 pm
Nonstop0h 00m
$394
ChicagoSofia
ORD Chicago O'Hare Intl - SOF Sofia
ORDSOF
Chicago O'Hare Intl
Sat 10/24
8:01 pm-10:30 am
3 stops55h 29m
Sofia
Wed 12/31
12:00 am-4:00 pm
Nonstop0h 00m
$400
ChicagoSofia
ORD Chicago O'Hare Intl - SOF Sofia
ORDSOF
Chicago O'Hare Intl
Tue 10/27
4:55 pm-1:55 pm
1 stop14h 00m
Sofia
Wed 12/31
12:00 am-4:00 pm
Nonstop0h 00m
$416
ChicagoSofia
ORD Chicago O'Hare Intl - SOF Sofia
ORDSOF
Chicago O'Hare Intl
Sun 10/11
3:45 pm-12:50 am
2 stops25h 05m
Sofia
Wed 12/31
12:00 am-4:00 pm
Nonstop0h 00m
$422
ChicagoSofia
ORD Chicago O'Hare Intl - SOF Sofia
ORDSOF
Chicago O'Hare Intl
Wed 10/28
9:15 pm-8:50 pm
1 stop16h 35m
Sofia
Wed 12/31
12:00 am-4:00 pm
Nonstop0h 00m
$427
Quickest round-trip
ChicagoSofia
ORD Chicago O'Hare Intl - SOF Sofia
ORDSOF
Chicago O'Hare Intl
Sun 10/25
12:45 pm-8:40 am
1 stop12h 55m
Sofia
Wed 12/31
12:00 am-4:00 pm
Nonstop0h 00m
$427
Showing 1-10 of 21 resultsSorted by cheapest first
Best time to book a flight from Illinois to Sofia
Have a flexible travel schedule? Discover the best time to fly to Sofia from Illinois with our price prediction graph.
ORD-SOF
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 Illinois to Sofia
USIL-SOF
ORD-SOF
What is the cheapest month to book a flight from Illinois to Sofia?
Currently, February is the cheapest month in which you can book a flight from Illinois to Sofia (average of $586). Flying from Illinois to Sofia in June is currently the most expensive (average of $1,174). 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 Illinois to Sofia?
Airfare is typical for this route at the moment.
Illinois to Sofia flights typically cost between $623 and $840 in November.The cheapest round-trip price found within the last 5 days was $706 on Multiple Airlines (Nov 6-Nov 17).
How far ahead should I book a flight from Illinois to Sofia?
Booking 41 days in advance of your planned departure date is, on average, the best time to get cheap flights from Illinois to Sofia. The general trend is that the closer you book to the departure date, the more expensive your flight will be.
Related info for your journey
Find useful and relevant information for your journey from Illinois to Sofia. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
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.
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Alternative routes for Illinois to Sofia
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Complete your trip
Complete your trip to Sofia by adding a car rental and/or hotel reservation to your travel itinerary.
Search flights from Illinois to Sofia by cabin class
Find flights from Illinois to Sofia, based on your preferred cabin class, be it economy, premium economy, business, or first class.
Illinois and Sofia flights
Browse other Illinois and Sofia flight options. Last updated on October 2, 2026.
Popular flight searches
Check out other popular destinations found by fellow travelers in 2026
Other flights to Sofia
Explore flights to Sofia departing from other origins. Flights are based on user searches made on Cheapflights and were last updated on October 2, 2026.
Top 10 airlines flying from Illinois to Sofia
Discover the top 10 airlines that operate flights from Illinois to Sofia. 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 7,457,451 searches. Data last updated October 2, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$451 | Average$1,036 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$526 | Average$734 | FlexibilityNo cancel fee | On-time77% | |
| Cheapest$565 | Average$839 | FlexibilityNo cancel fee | On-time79% | |
| Cheapest$580 | Average$649 | FlexibilityNo cancel fee | On-time70% | |
| Cheapest$583 | Average$1,054 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$585 | Average$870 | FlexibilityNo cancel fee | On-time77% | |
| Cheapest$586 | Average$987 | FlexibilityNo cancel fee | On-time81% | |
| Cheapest$610 | Average$1,034 | FlexibilityNo cancel fee | On-time76% | |
| Cheapest$613 | Average$860 | FlexibilityNo cancel fee | On-time75% | |
| Cheapest$726 | Average$872 | FlexibilityNo cancel fee | On-timeN/A |