$331+ Cheap flights from Illinois to Sofia (SOF)
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 10/1. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — SOF
Sep 29 — Oct 61
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
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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
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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 August 30, 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 August 30, 2026.
This FlightHub deal was found by Cheapflights users on 8/30. 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 9/218:10 pm -
1 stop16h 10m
Wed 10/149:10 pm -
1 stop20h 30m
Deal found 8/30![Turkish Airlines logo]()
$718
This Expedia deal was found by Cheapflights users on 8/30. 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.
Tue 12/297:05 am -
2 stops22h 20m
Tue 1/126:25 am -
1 stop14h 45m
Deal found 8/30![Multiple Airlines logo]()
$719
This FlightHub deal was found by Cheapflights users on 8/29. 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.
Sun 10/1111:25 am -
1 stop13h 20m
Wed 10/213:50 pm -
1 stop25h 50m
Deal found 8/29![Turkish Airlines logo]()
$720
This Expedia deal was found by Cheapflights users on 8/30. 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.
Tue 12/297:05 am -
2 stops22h 20m
Wed 1/136:25 am -
2 stops16h 27m
Deal found 8/30![Multiple Airlines logo]()
$722
This Expedia deal was found by Cheapflights users on 8/29. 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.
Mon 12/289:50 pm -
1 stop17h 05m
Mon 1/112:00 pm -
2 stops35h 43m
Deal found 8/29![Multiple Airlines logo]()
$723
This FlightHub deal was found by Cheapflights users on 8/26. 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 9/228:10 pm -
1 stop34h 50m
Tue 10/63:50 pm -
1 stop25h 50m
Deal found 8/26![Turkish Airlines logo]()
$725
This oojo deal was found by Cheapflights users on 8/28. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/189:50 pm -
1 stop32h 00m
Sun 11/12:35 pm -
1 stop13h 20m
Deal found 8/28![LOT logo]()
$726
This Bravofly deal was found by Cheapflights users on 8/27. 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 Bravofly is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/1111:25 am -
1 stop13h 20m
Sun 10/189:10 pm -
1 stop20h 30m
Deal found 8/27![Turkish Airlines logo]()
$727
This oojo deal was found by Cheapflights users on 8/29. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/95:10 pm -
1 stop16h 50m
Wed 10/146:45 pm -
1 stop28h 25m
Deal found 8/29![LOT logo]()
$729
This FlightHub deal was found by Cheapflights users on 8/29. 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.
Mon 10/1911:25 am -
1 stop24h 55m
Mon 11/29:45 pm -
1 stop21h 15m
Deal found 8/29![Turkish Airlines logo]()
$732
This United Airlines deal was found by Cheapflights users on 8/26. 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 10/105:36 pm -
2 stops41h 04m
Sat 10/1712:55 pm -
2 stops40h 26m
Deal found 8/26![United Airlines logo]()
$970
This United Airlines deal was found by Cheapflights users on 8/26. 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 9/93:32 pm -
2 stops23h 43m
Wed 9/166:20 am -
1 stop15h 05m
Deal found 8/26![United Airlines logo]()
$986
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 August 30, 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 August 30, 2026.
This Turkish Airlines deal was found by Cheapflights users on 8/27. 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.
Tue 9/228:10 pm -
1 stop28h 35m
Tue 10/203:50 pm -
1 stop25h 50m
Deal found 8/27![Turkish Airlines logo]()
$750
This United Airlines deal was found by Cheapflights users on 8/28. 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.
Mon 1/113:21 pm -
2 stops23h 34m
Thu 1/142:10 pm -
2 stops33h 16m
Deal found 8/28![United Airlines logo]()
$783
This United deal was found by Cheapflights users on 8/30. 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 United is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/266:05 pm -
1 stop20h 55m
Tue 1/126:25 am -
1 stop14h 45m
Deal found 8/30![Multiple Airlines logo]()
$788
This British Airways deal was found by Cheapflights users on 8/26. 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 10/244:26 pm -
2 stops19h 09m
Mon 11/95:15 pm -
2 stops31h 40m
Deal found 8/26![British Airways logo]()
$798
This oojo deal was found by Cheapflights users on 8/26. 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 9/93:30 pm -
1 stop23h 20m
Wed 9/166:20 am -
1 stop15h 05m
Deal found 8/26![Lufthansa logo]()
$1,049
This United Airlines deal was found by Cheapflights users on 8/30. 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 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 8/30![United Airlines logo]()
$784
This United Airlines deal was found by Cheapflights users on 8/30. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/129:21 pm -
2 stops41h 34m
Sun 1/106:00 am -
1 stop16h 10m
Deal found 8/30![United Airlines logo]()
$785
This United Airlines deal was found by Cheapflights users on 8/29. 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.
Mon 10/1912:59 pm -
2 stops15h 11m
Wed 11/46:00 am -
1 stop16h 10m
Deal found 8/29![United Airlines logo]()
$789
This FlightHub deal was found by Cheapflights users on 8/28. 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.
Wed 9/912:28 pm -
2 stops15h 12m
Wed 9/166:20 am -
2 stops23h 11m
Deal found 8/28![Multiple Airlines logo]()
$999
This United Airlines deal was found by Cheapflights users on 8/26. 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 1/169:30 pm -
2 stops31h 45m
Sat 1/236:25 am -
1 stop16h 55m
Deal found 8/26![United Airlines logo]()
$796
This Expedia deal was found by Cheapflights users on 8/25. 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 11/96:50 pm -
2 stops20h 05m
Thu 11/122:10 pm -
2 stops33h 16m
Deal found 8/25![Multiple Airlines logo]()
$1,057
This United Airlines deal was found by Cheapflights users on 8/26. 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 12/1410:59 am -
2 stops18h 16m
Mon 1/112:00 pm -
2 stops35h 43m
Deal found 8/26![United Airlines logo]()
$803
This United Airlines deal was found by Cheapflights users on 8/30. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/191:55 pm -
2 stops15h 20m
Tue 12/226:25 am -
1 stop14h 45m
Deal found 8/30![United Airlines logo]()
$834
This United Airlines deal was found by Cheapflights users on 8/28. 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.
Mon 11/21:30 pm -
2 stops15h 45m
Sat 4/176:20 am -
2 stops17h 15m
Deal found 8/28![United Airlines logo]()
$842
This United Airlines deal was found by Cheapflights users on 8/26. 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 10/105:36 pm -
2 stops41h 04m
Sat 10/1712:55 pm -
2 stops40h 26m
Deal found 8/26![United Airlines logo]()
$970
This Mytrip deal was found by Cheapflights users on 8/28. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/223:20 pm -
3 stops26h 15m
Thu 10/1512:55 pm -
3 stops30h 05m
Deal found 8/28![Multiple Airlines logo]()
$1,605
This United Airlines deal was found by Cheapflights users on 8/26. 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 9/93:32 pm -
2 stops23h 43m
Wed 9/166:20 am -
2 stops20h 21m
Deal found 8/26![United Airlines logo]()
$989
This United Airlines deal was found by Cheapflights users on 8/29. 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 9/265:36 pm -
2 stops34h 34m
Sat 10/178:00 am -
2 stops21h 37m
Deal found 8/29![United Airlines logo]()
$1,051
Last-minute flights from Illinois to SofiaDiscover last-minute flight deals from Illinois to Sofia. Data last updated August 30, 2026 and is based on user searches.
Discover last-minute flight deals from Illinois to Sofia. Data last updated August 30, 2026 and is based on user searches.
This United Airlines deal was found by Cheapflights users on 8/26. 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 9/93:32 pm -
2 stops23h 43m
Wed 9/166:20 am -
1 stop15h 05m
Deal found 8/26![United Airlines logo]()
$986
This oojo deal was found by Cheapflights users on 8/27. 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.
Mon 9/149:50 pm -
1 stop32h 05m
Wed 11/186:40 pm -
1 stop33h 15m
Deal found 8/27![LOT logo]()
$728
This oojo deal was found by Cheapflights users on 8/27. 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.
Mon 9/149:50 pm -
1 stop32h 05m
Wed 11/116:40 pm -
1 stop33h 15m
Deal found 8/27![LOT logo]()
$751
This FlightHub deal was found by Cheapflights users on 8/30. 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 9/218:10 pm -
1 stop16h 10m
Wed 10/149:10 pm -
1 stop20h 30m
Deal found 8/30![Turkish Airlines logo]()
$718
This Turkish Airlines deal was found by Cheapflights users on 8/27. 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.
Mon 9/218:10 pm -
1 stop28h 35m
Thu 10/299:40 am -
1 stop32h 20m
Deal found 8/27![Turkish Airlines logo]()
$740
This FlightHub deal was found by Cheapflights users on 8/30. 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 9/218:10 pm -
1 stop28h 35m
Mon 10/59:10 pm -
1 stop20h 30m
Deal found 8/30![Turkish Airlines logo]()
$756
This FlightHub deal was found by Cheapflights users on 8/26. 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 9/228:10 pm -
1 stop34h 50m
Tue 10/63:50 pm -
1 stop25h 50m
Deal found 8/26![Turkish Airlines logo]()
$725
This Turkish Airlines deal was found by Cheapflights users on 8/27. 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.
Tue 9/228:10 pm -
1 stop28h 35m
Wed 10/284:00 pm -
1 stop26h 00m
Deal found 8/27![Turkish Airlines logo]()
$750
This FlightHub deal was found by Cheapflights users on 8/29. 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.
Wed 9/238:10 pm -
1 stop34h 50m
Tue 10/133:50 pm -
1 stop25h 50m
Deal found 8/29![Turkish Airlines logo]()
$743
This CheapOair deal was found by Cheapflights users on 8/27. 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.
Thu 9/248:10 pm -
1 stop34h 50m
Thu 10/223:50 pm -
1 stop25h 50m
Deal found 8/27![Turkish Airlines logo]()
$735
This Turkish Airlines deal was found by Cheapflights users on 8/27. 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 9/248:10 pm -
1 stop34h 50m
Thu 10/299:45 pm -
1 stop20h 15m
Deal found 8/27![Turkish Airlines logo]()
$755
This FlightHub deal was found by Cheapflights users on 8/29. 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.
Wed 9/308:10 pm -
1 stop31h 35m
Wed 10/149:10 pm -
1 stop20h 30m
Deal found 8/29![Turkish Airlines logo]()
$742
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 August 30, 2026.
Search for one-way flight options from Illinois to Sofia. Find affordable one-way fares based on user searches. Data last updated August 30, 2026.
This Kiwi.com deal was found by Cheapflights users on 8/29. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/17:25 pm -
3 stops45h 45m
Deal found 8/29![Multiple Airlines logo]()
$331
This Expedia deal was found by Cheapflights users on 8/28. 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 11/308:45 pm -
2 stops39h 25m
Deal found 8/28![British Airways logo]()
$332
This Kiwi.com deal was found by Cheapflights users on 8/28. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/306:30 pm -
3 stops34h 20m
Deal found 8/28![Multiple Airlines logo]()
$334
This Kiwi.com deal was found by Cheapflights users on 8/30. 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 11/26:30 pm -
3 stops34h 20m
Deal found 8/30![Multiple Airlines logo]()
$337
This Kiwi.com deal was found by Cheapflights users on 8/27. 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.
Sat 9/57:11 am -
3 stops33h 29m
Deal found 8/27![Multiple Airlines logo]()
$349
This Kiwi.com deal was found by Cheapflights users on 8/26. 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 9/810:25 pm -
3 stops30h 30m
Deal found 8/26![Multiple Airlines logo]()
$363
This Kiwi.com deal was found by Cheapflights users on 8/26. 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 9/610:25 pm -
3 stops33h 15m
Deal found 8/26![Multiple Airlines logo]()
$366
This Kiwi.com deal was found by Cheapflights users on 8/29. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/63:50 pm -
2 stops48h 50m
Deal found 8/29![Multiple Airlines logo]()
$392
This FlightHub deal was found by Cheapflights users on 8/27. 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 9/148:10 pm -
1 stop34h 50m
Deal found 8/27![Turkish Airlines logo]()
$397
This Kiwi.com deal was found by Cheapflights users on 8/27. 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.
Sat 9/56:05 am -
3 stops34h 35m
Deal found 8/27![Multiple Airlines logo]()
$402
This Kiwi.com deal was found by Cheapflights users on 8/27. 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 9/232:29 pm -
3 stops42h 36m
Deal found 8/27![Multiple Airlines logo]()
$438
This Kiwi.com deal was found by Cheapflights users on 8/27. 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 9/212:29 pm -
2 stops21h 51m
Deal found 8/27![Multiple Airlines logo]()
$451
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 August 30, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $718 (Expedia) |
One-way from | $331 (Kiwi.com) |
Popular in | July |
Cheapest in | February |
Average price | $833 |
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 August 30, 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 9/22
8:10 pm-8:45 am
1 stop28h 35m
Sofia
Tue 10/20
3:50 pm-9:40 am
1 stop25h 50m
$750
St. LouisSofia
STL Lambert-St Louis - SOF Sofia
STLSOF
Lambert-St Louis
Mon 1/11
3:21 pm-10:55 pm
2 stops23h 34m
Sofia
Thu 1/14
2:10 pm-3:26 pm
2 stops33h 16m
$783
ChicagoSofia
ORD Chicago O'Hare Intl - SOF Sofia
ORDSOF
Chicago O'Hare Intl
Wed 11/11
11:56 am-1:15 pm
2 stops17h 19m
Sofia
Thu 4/1
6:20 am-12:55 pm
1 stop14h 35m
$784
ChicagoSofia
ORD Chicago O'Hare Intl - SOF Sofia
ORDSOF
Chicago O'Hare Intl
Sat 12/12
9:21 pm-10:55 pm
2 stops41h 34m
Sofia
Sun 1/10
6:00 am-2:10 pm
1 stop16h 10m
$785
ChicagoSofia
ORD Chicago O'Hare Intl - SOF Sofia
ORDSOF
Chicago O'Hare Intl
Sat 12/26
6:05 pm-11:00 pm
1 stop20h 55m
Sofia
Tue 1/12
6:25 am-1:10 pm
1 stop14h 45m
$788
ChicagoSofia
ORD Chicago O'Hare Intl - SOF Sofia
ORDSOF
Chicago O'Hare Intl
Mon 10/19
12:59 pm-12:10 pm
2 stops15h 11m
Sofia
Wed 11/4
6:00 am-2:10 pm
1 stop16h 10m
$789
ChicagoSofia
ORD Chicago O'Hare Intl - SOF Sofia
ORDSOF
Chicago O'Hare Intl
Sat 1/16
9:30 pm-1:15 pm
2 stops31h 45m
Sofia
Sat 1/23
6:25 am-3:20 pm
1 stop16h 55m
$796
ChicagoSofia
ORD Chicago O'Hare Intl - SOF Sofia
ORDSOF
Chicago O'Hare Intl
Sat 10/24
4:26 pm-7:35 pm
2 stops19h 09m
Sofia
Mon 11/9
5:15 pm-4:55 pm
2 stops31h 40m
$798
ChicagoSofia
ORD Chicago O'Hare Intl - SOF Sofia
ORDSOF
Chicago O'Hare Intl
Mon 12/14
10:59 am-1:15 pm
2 stops18h 16m
Sofia
Mon 1/11
2:00 pm-5:43 pm
2 stops35h 43m
$803
Quickest round-trip
ChicagoSofia
ORD Chicago O'Hare Intl - SOF Sofia
ORDSOF
Chicago O'Hare Intl
Thu 11/19
1:55 pm-1:15 pm
2 stops15h 20m
Sofia
Tue 12/22
6:25 am-1:10 pm
1 stop14h 45m
$834
Showing 1-10 of 39 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
STL-SOF
MDW-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
STL-SOF
MDW-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 $593). Flying from Illinois to Sofia in June is currently the most expensive (average of $1,153). 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 $669 and $848 in September.The cheapest round-trip price found within the last 5 days was $718 on Turkish Airlines (Sep 21-Oct 14).
How far ahead should I book a flight from Illinois to Sofia?
Booking 73 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.
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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 August 30, 2026.
Popular flight searches
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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 August 30, 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 August 30, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$451 | Average$1,036 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$525 | Average$716 | FlexibilityNo cancel fee | On-time77% | |
| Cheapest$582 | Average$994 | FlexibilityNo cancel fee | On-time81% | |
| Cheapest$585 | Average$870 | FlexibilityNo cancel fee | On-time77% | |
| Cheapest$593 | Average$840 | FlexibilityNo cancel fee | On-time79% | |
| Cheapest$608 | Average$1,049 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$609 | Average$727 | FlexibilityNo cancel fee | On-time70% | |
| Cheapest$610 | Average$963 | FlexibilityNo cancel fee | On-time76% | |
| Cheapest$613 | Average$838 | FlexibilityNo cancel fee | On-time75% | |
| Cheapest$701 | Average$941 | FlexibilityNo cancel fee | On-time78% |