$268+ 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 4/20. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — SOF
May 5 — May 121
Round-trip
1 adult, Economy
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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 April 5, 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 April 5, 2026.
This Justfly.com deal was found by Cheapflights users on 4/4. 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.
Thu 7/308:10 pm
ORD
- SOF
1 stop34h 50m
Turkish Airlines
Fri 9/182:05 pm
SOF
- ORD
1 stop27h 35m
Turkish Airlines
Deal found 4/4![Turkish Airlines logo]()
$592
This Kiwi.com deal was found by Cheapflights users on 4/1. 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.
Mon 9/711:25 am
ORD
- SOF
1 stop13h 20m
Turkish Airlines
Thu 10/19:05 pm
SOF
- ORD
1 stop20h 35m
Turkish Airlines
Deal found 4/1![Turkish Airlines logo]()
$596
This FlightHub deal was found by Cheapflights users on 3/31. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/238:10 pm
ORD
- SOF
1 stop34h 50m
Turkish Airlines
Mon 5/43:50 pm
SOF
- ORD
1 stop25h 50m
Turkish Airlines
Deal found 3/31![Turkish Airlines logo]()
$599
This FlightHub deal was found by Cheapflights users on 3/31. 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 9/1111:25 am
ORD
- SOF
1 stop19h 35m
Turkish Airlines
Fri 9/253:50 pm
SOF
- ORD
1 stop25h 50m
Turkish Airlines
Deal found 3/31![Turkish Airlines logo]()
$606
This FlightHub deal was found by Cheapflights users on 3/31. 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 4/228:10 pm
ORD
- SOF
1 stop16h 05m
Turkish Airlines
Wed 5/63:50 pm
SOF
- ORD
1 stop25h 50m
Turkish Airlines
Deal found 3/31![Turkish Airlines logo]()
$607
This Kiwi.com deal was found by Cheapflights users on 3/31. 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 4/198:10 pm
ORD
- SOF
1 stop16h 05m
Turkish Airlines
Tue 4/289:35 am
SOF
- ORD
1 stop32h 05m
Turkish Airlines
Deal found 3/31![Turkish Airlines logo]()
$612
This oojo deal was found by Cheapflights users on 4/3. 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 9/411:25 am
ORD
- SOF
1 stop24h 50m
Turkish Airlines
Fri 9/182:05 pm
SOF
- ORD
1 stop27h 35m
Turkish Airlines
Deal found 4/3![Turkish Airlines logo]()
$615
This Kiwi.com deal was found by Cheapflights users on 3/31. 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 4/218:10 pm
ORD
- SOF
1 stop16h 05m
Turkish Airlines
Tue 5/53:50 pm
SOF
- ORD
1 stop25h 50m
Turkish Airlines
Deal found 3/31![Turkish Airlines logo]()
$617
This Kiwi.com deal was found by Cheapflights users on 3/31. 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 4/238:10 pm
ORD
- SOF
1 stop16h 05m
Turkish Airlines
Wed 5/69:05 pm
SOF
- ORD
1 stop20h 35m
Turkish Airlines
Deal found 3/31![Turkish Airlines logo]()
$621
This oojo deal was found by Cheapflights users on 3/31. 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 4/278:10 pm
ORD
- SOF
1 stop16h 05m
Turkish Airlines
Tue 9/229:05 pm
SOF
- ORD
1 stop20h 35m
Turkish Airlines
Deal found 3/31![Turkish Airlines logo]()
$622
This oojo deal was found by Cheapflights users on 4/4. 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 10/58:10 pm
ORD
- SOF
1 stop34h 50m
Turkish Airlines
Mon 10/193:50 pm
SOF
- ORD
1 stop25h 50m
Turkish Airlines
Deal found 4/4![Turkish Airlines logo]()
$624
This FlightHub deal was found by Cheapflights users on 4/4. 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 8/28:10 pm
ORD
- SOF
1 stop16h 05m
Turkish Airlines
Sun 9/63:50 pm
SOF
- ORD
1 stop25h 50m
Turkish Airlines
Deal found 4/4![Turkish Airlines logo]()
$625
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 April 5, 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 April 5, 2026.
This United Airlines deal was found by Cheapflights users on 4/1. 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.
Wed 9/95:10 am
STL
- SOF
2 stops29h 30m
United Airlines
Wed 9/166:20 am
SOF
- STL
2 stops20h 21m
United Airlines
Deal found 4/1![United Airlines logo]()
$840
This Justfly.com deal was found by Cheapflights users on 4/1. 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 Justfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/93:30 pm
STL
- SOF
1 stop18h 35m
Lufthansa
Wed 9/166:20 am
SOF
- STL
1 stop15h 05m
Lufthansa
Deal found 4/1![Lufthansa logo]()
$842
This KLM deal was found by Cheapflights users on 3/31. 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.
Tue 4/281:24 pm
MDW
- SOF
2 stops16h 36m
KLM
Tue 9/297:00 am
SOF
- MDW
2 stops17h 27m
KLM
Deal found 3/31![KLM logo]()
$876
This KLM deal was found by Cheapflights users on 4/2. 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 KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/111:30 pm
ORD
- SOF
2 stops16h 30m
Multiple Airlines
Sat 9/197:00 am
SOF
- ORD
2 stops18h 41m
Multiple Airlines
Deal found 4/2![Multiple Airlines logo]()
$933
This United Airlines deal was found by Cheapflights users on 4/1. 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 7/319:40 pm
ORD
- SOF
1 stop17h 35m
United Airlines
Sun 8/236:20 am
SOF
- ORD
2 stops20h 17m
United Airlines
Deal found 4/1![United Airlines logo]()
$888
This KLM deal was found by Cheapflights users on 4/3. 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 7/1212:27 pm
ORD
- SOF
2 stops17h 33m
KLM
Sat 8/297:00 am
SOF
- ORD
2 stops21h 17m
KLM
Deal found 4/3![KLM logo]()
$933
This KLM deal was found by Cheapflights users on 3/31. 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 7/304:20 pm
ORD
- SOF
1 stop13h 40m
Multiple Airlines
Thu 8/137:00 am
SOF
- ORD
1 stop16h 10m
Multiple Airlines
Deal found 3/31![Multiple Airlines logo]()
$949
This United Airlines deal was found by Cheapflights users on 4/1. 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 7/319:40 pm
ORD
- SOF
1 stop17h 35m
United Airlines
Fri 8/286:20 am
SOF
- ORD
2 stops20h 17m
United Airlines
Deal found 4/1![United Airlines logo]()
$895
This KLM deal was found by Cheapflights users on 4/1. 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 KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/11:24 pm
MDW
- SOF
2 stops16h 36m
KLM
Fri 5/87:00 am
SOF
- MDW
2 stops18h 56m
KLM
Deal found 4/1![KLM logo]()
$950
This United Airlines deal was found by Cheapflights users on 4/1. 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 7/319:50 am
ORD
- SOF
2 stops17h 00m
United Airlines
Mon 8/246:20 am
SOF
- ORD
2 stops20h 17m
United Airlines
Deal found 4/1![United Airlines logo]()
$908
This KLM deal was found by Cheapflights users on 3/31. 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.
Tue 4/71:10 pm
MDW
- SOF
2 stops16h 50m
KLM
Fri 4/177:00 am
SOF
- MDW
2 stops18h 58m
KLM
Deal found 3/31![KLM logo]()
$951
This United Airlines deal was found by Cheapflights users on 3/31. 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 9/112:20 pm
ORD
- SOF
2 stops13h 50m
United Airlines
Fri 9/256:20 am
SOF
- ORD
2 stops18h 15m
United Airlines
Deal found 3/31![United Airlines logo]()
$921
This Trip.com deal was found by Cheapflights users on 3/31. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 7/53:30 pm
STL
- SOF
1 stop23h 30m
Multiple Airlines
Mon 7/278:10 pm
SOF
- STL
1 stop31h 20m
Multiple Airlines
Deal found 3/31![Multiple Airlines logo]()
$1,121
This KLM deal was found by Cheapflights users on 3/30. 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.
Wed 4/81:10 pm
MDW
- SOF
2 stops16h 50m
KLM
Fri 4/177:00 am
SOF
- MDW
2 stops17h 29m
KLM
Deal found 3/30![KLM logo]()
$952
This United Airlines deal was found by Cheapflights users on 4/4. 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 5/82:55 pm
ORD
- SOF
1 stop11h 55m
United Airlines
Sun 5/176:10 am
SOF
- ORD
1 stop20h 05m
United Airlines
Deal found 4/4![United Airlines logo]()
$923
This Expedia deal was found by Cheapflights users on 3/31. 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 6/27:05 am
STL
- SOF
2 stops19h 55m
Multiple Airlines
Thu 6/116:45 pm
SOF
- STL
1 stop26h 40m
Multiple Airlines
Deal found 3/31![Multiple Airlines logo]()
$1,126
This KLM deal was found by Cheapflights users on 3/30. 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.
Tue 4/712:47 pm
MDW
- SOF
2 stops17h 13m
KLM
Thu 4/167:00 am
SOF
- MDW
2 stops17h 29m
KLM
Deal found 3/30![KLM logo]()
$952
This KLM deal was found by Cheapflights users on 3/31. 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 4/261:24 pm
MDW
- SOF
2 stops16h 36m
KLM
Wed 9/237:00 am
SOF
- MDW
2 stops17h 27m
KLM
Deal found 3/31![KLM logo]()
$954
This United Airlines deal was found by Cheapflights users on 4/3. 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 5/198:45 am
ORD
- SOF
2 stops18h 15m
United Airlines
Tue 5/262:10 pm
SOF
- ORD
2 stops25h 17m
United Airlines
Deal found 4/3![United Airlines logo]()
$955
This KLM deal was found by Cheapflights users on 3/31. 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 4/161:24 pm
MDW
- SOF
2 stops16h 36m
KLM
Wed 4/297:00 am
SOF
- MDW
2 stops18h 58m
KLM
Deal found 3/31![KLM logo]()
$1,001
This United Airlines deal was found by Cheapflights users on 4/4. 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 7/1511:03 am
ORD
- SOF
2 stops17h 07m
United Airlines
Wed 7/226:10 am
SOF
- ORD
2 stops24h 05m
United Airlines
Deal found 4/4![United Airlines logo]()
$1,032
This KLM deal was found by Cheapflights users on 4/3. 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.
Tue 5/1212:53 pm
MDW
- SOF
2 stops17h 07m
KLM
Mon 6/17:00 am
SOF
- MDW
2 stops17h 12m
KLM
Deal found 4/3![KLM logo]()
$1,047
This United Airlines deal was found by Cheapflights users on 3/31. 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.
Sun 7/57:00 am
STL
- SOF
2 stops32h 15m
United Airlines
Mon 7/272:20 pm
SOF
- STL
2 stops26h 21m
United Airlines
Deal found 3/31![United Airlines logo]()
$1,092
This KLM deal was found by Cheapflights users on 3/31. 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 4/261:24 pm
MDW
- SOF
2 stops16h 36m
KLM
Tue 9/227:00 am
SOF
- MDW
2 stops17h 27m
KLM
Deal found 3/31![KLM logo]()
$1,070
This United Airlines deal was found by Cheapflights users on 3/31. 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 6/21:05 pm
STL
- SOF
2 stops37h 35m
United Airlines
Thu 6/116:30 am
SOF
- STL
2 stops37h 36m
United Airlines
Deal found 3/31![United Airlines logo]()
$1,109
This KLM deal was found by Cheapflights users on 4/4. 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.
Sat 4/181:24 pm
MDW
- SOF
2 stops16h 36m
KLM
Sun 4/267:00 am
SOF
- MDW
2 stops17h 26m
KLM
Deal found 4/4![KLM logo]()
$1,079
This KLM deal was found by Cheapflights users on 3/31. 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.
Tue 4/2112:52 pm
MDW
- SOF
2 stops17h 08m
KLM
Mon 9/287:00 am
SOF
- MDW
2 stops17h 27m
KLM
Deal found 3/31![KLM logo]()
$1,209
Last-minute flights from Illinois to SofiaDiscover last-minute flight deals from Illinois to Sofia. Data last updated April 5, 2026 and is based on user searches.
Discover last-minute flight deals from Illinois to Sofia. Data last updated April 5, 2026 and is based on user searches.
This Kiwi.com deal was found by Cheapflights users on 3/31. 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 4/148:10 pm
ORD
- SOF
1 stop34h 50m
Turkish Airlines
Tue 4/289:05 pm
SOF
- ORD
1 stop20h 35m
Turkish Airlines
Deal found 3/31![Turkish Airlines logo]()
$635
This FlightHub deal was found by Cheapflights users on 3/31. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/168:10 pm
ORD
- SOF
1 stop16h 05m
Turkish Airlines
Tue 4/289:35 am
SOF
- ORD
1 stop32h 05m
Turkish Airlines
Deal found 3/31![Turkish Airlines logo]()
$627
This Kiwi.com deal was found by Cheapflights users on 3/31. 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 4/198:10 pm
ORD
- SOF
1 stop16h 05m
Turkish Airlines
Tue 4/289:35 am
SOF
- ORD
1 stop32h 05m
Turkish Airlines
Deal found 3/31![Turkish Airlines logo]()
$612
This KAYAK deal was found by Cheapflights users on 3/31. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/208:10 pm
ORD
- SOF
1 stop16h 05m
Turkish Airlines
Thu 5/73:50 pm
SOF
- ORD
1 stop25h 50m
Turkish Airlines
Deal found 3/31![Turkish Airlines logo]()
$656
This Kiwi.com deal was found by Cheapflights users on 3/31. 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 4/218:10 pm
ORD
- SOF
1 stop16h 05m
Turkish Airlines
Tue 5/53:50 pm
SOF
- ORD
1 stop25h 50m
Turkish Airlines
Deal found 3/31![Turkish Airlines logo]()
$617
This FlightHub deal was found by Cheapflights users on 3/31. 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 4/228:10 pm
ORD
- SOF
1 stop16h 05m
Turkish Airlines
Wed 5/63:50 pm
SOF
- ORD
1 stop25h 50m
Turkish Airlines
Deal found 3/31![Turkish Airlines logo]()
$607
This FlightHub deal was found by Cheapflights users on 3/31. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/238:10 pm
ORD
- SOF
1 stop34h 50m
Turkish Airlines
Mon 5/43:50 pm
SOF
- ORD
1 stop25h 50m
Turkish Airlines
Deal found 3/31![Turkish Airlines logo]()
$599
This Kiwi.com deal was found by Cheapflights users on 3/31. 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 4/238:10 pm
ORD
- SOF
1 stop16h 05m
Turkish Airlines
Wed 5/69:05 pm
SOF
- ORD
1 stop20h 35m
Turkish Airlines
Deal found 3/31![Turkish Airlines logo]()
$621
This Justfly.com deal was found by Cheapflights users on 3/31. 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.
Thu 4/238:10 pm
ORD
- SOF
1 stop28h 35m
Turkish Airlines
Tue 5/53:50 pm
SOF
- ORD
1 stop25h 50m
Turkish Airlines
Deal found 3/31![Turkish Airlines logo]()
$642
This oojo deal was found by Cheapflights users on 3/31. 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 4/278:10 pm
ORD
- SOF
1 stop16h 05m
Turkish Airlines
Tue 9/229:05 pm
SOF
- ORD
1 stop20h 35m
Turkish Airlines
Deal found 3/31![Turkish Airlines logo]()
$622
This FlightHub deal was found by Cheapflights users on 4/1. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/2811:25 am
ORD
- SOF
1 stop19h 35m
Turkish Airlines
Wed 5/139:05 pm
SOF
- ORD
1 stop20h 35m
Turkish Airlines
Deal found 4/1![Turkish Airlines logo]()
$630
This KLM deal was found by Cheapflights users on 3/31. 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 5/31:24 pm
MDW
- SOF
2 stops16h 36m
KLM
Fri 5/157:00 am
SOF
- MDW
2 stops18h 56m
KLM
Deal found 3/31![KLM logo]()
$852
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 April 5, 2026.
Search for one-way flight options from Illinois to Sofia. Find affordable one-way fares based on user searches. Data last updated April 5, 2026.
This Kiwi.com deal was found by Cheapflights users on 4/2. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/202:10 pm
ORD
- SOF
3 stops24h 20m
Multiple Airlines
Deal found 4/2![Multiple Airlines logo]()
$268
This Kiwi.com deal was found by Cheapflights users on 3/31. 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 4/197:25 pm
ORD
- SOF
2 stops18h 35m
Multiple Airlines
Deal found 3/31![Multiple Airlines logo]()
$308
This Kiwi.com deal was found by Cheapflights users on 3/31. 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 4/227:25 pm
ORD
- SOF
2 stops20h 55m
Multiple Airlines
Deal found 3/31![Multiple Airlines logo]()
$311
This Kiwi.com deal was found by Cheapflights users on 3/31. 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 4/267:25 pm
ORD
- SOF
2 stops18h 35m
Multiple Airlines
Deal found 3/31![Multiple Airlines logo]()
$312
This Kiwi.com deal was found by Cheapflights users on 3/31. 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 4/257:25 pm
ORD
- SOF
3 stops37h 10m
Multiple Airlines
Deal found 3/31![Multiple Airlines logo]()
$322
This Kiwi.com deal was found by Cheapflights users on 3/31. 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 4/2410:25 pm
ORD
- SOF
3 stops34h 05m
Multiple Airlines
Deal found 3/31![Multiple Airlines logo]()
$325
This Kiwi.com deal was found by Cheapflights users on 3/31. 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 4/187:25 pm
ORD
- SOF
3 stops36h 20m
Multiple Airlines
Deal found 3/31![Multiple Airlines logo]()
$326
This Kiwi.com deal was found by Cheapflights users on 3/31. 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 4/217:25 pm
ORD
- SOF
3 stops39h 30m
Multiple Airlines
Deal found 3/31![Multiple Airlines logo]()
$328
This Kiwi.com deal was found by Cheapflights users on 3/31. 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 4/217:30 am
MDW
- SOF
2 stops33h 45m
Multiple Airlines
Deal found 3/31![Multiple Airlines logo]()
$328
This Kiwi.com deal was found by Cheapflights users on 4/3. 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 6/83:20 pm
MDW
- SOF
3 stops35h 50m
Multiple Airlines
Deal found 4/3![Multiple Airlines logo]()
$387
This Kiwi.com deal was found by Cheapflights users on 4/3. 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 6/1110:25 am
MDW
- SOF
3 stops52h 05m
Multiple Airlines
Deal found 4/3![Multiple Airlines logo]()
$388
This Kiwi.com deal was found by Cheapflights users on 4/3. 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 5/1210:30 am
MDW
- SOF
3 stops38h 25m
Multiple Airlines
Deal found 4/3![Multiple Airlines logo]()
$391
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 April 5, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $592 (Justfly.com) |
One-way from | $268 (Kiwi.com) |
Popular in | June |
Cheapest in | February |
Average price | $701 |
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 2,558,603 searches. Data last updated April 5, 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
St. LouisSofia
STL - SOF
STLSOF
Lambert-St Louis
Wed 9/9
5:10 am-6:40 pm
2 stops29h 30m
Sofia
Wed 9/16
6:20 am-6:41 pm
2 stops20h 21m
$840
St. LouisSofia
STL - SOF
STLSOF
Lambert-St Louis
Wed 9/9
3:30 pm-6:05 pm
1 stop18h 35m
Sofia
Wed 9/16
6:20 am-1:25 pm
1 stop15h 05m
$842
ChicagoSofia
MDW - SOF
MDWSOF
Chicago Midway
Tue 4/28
1:24 pm-2:00 pm
2 stops16h 36m
Sofia
Tue 9/29
7:00 am-4:27 pm
2 stops17h 27m
$876
ChicagoSofia
ORD - SOF
ORDSOF
Chicago O'Hare Intl
Fri 7/31
9:40 pm-11:15 pm
1 stop17h 35m
Sofia
Sun 8/23
6:20 am-6:37 pm
2 stops20h 17m
$888
ChicagoSofia
ORD - SOF
ORDSOF
Chicago O'Hare Intl
Fri 7/31
9:40 pm-11:15 pm
1 stop17h 35m
Sofia
Fri 8/28
6:20 am-6:37 pm
2 stops20h 17m
$895
ChicagoSofia
ORD - SOF
ORDSOF
Chicago O'Hare Intl
Fri 7/31
9:50 am-10:50 am
2 stops17h 00m
Sofia
Mon 8/24
6:20 am-6:37 pm
2 stops20h 17m
$908
ChicagoSofia
ORD - SOF
ORDSOF
Chicago O'Hare Intl
Fri 9/11
2:20 pm-12:10 pm
2 stops13h 50m
Sofia
Fri 9/25
6:20 am-4:35 pm
2 stops18h 15m
$921
ChicagoSofia
ORD - SOF
ORDSOF
Chicago O'Hare Intl
Fri 5/8
2:55 pm-10:50 am
1 stop11h 55m
Sofia
Sun 5/17
6:10 am-6:15 pm
1 stop20h 05m
$923
ChicagoSofia
ORD - SOF
ORDSOF
Chicago O'Hare Intl
Fri 9/11
1:30 pm-2:00 pm
2 stops16h 30m
Sofia
Sat 9/19
7:00 am-5:41 pm
2 stops18h 41m
$933
ChicagoSofia
ORD - SOF
ORDSOF
Chicago O'Hare Intl
Sun 7/12
12:27 pm-2:00 pm
2 stops17h 33m
Sofia
Sat 8/29
7:00 am-8:17 pm
2 stops21h 17m
$933
Showing 1-10 of 46 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
MDW-SOF
STL-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
MDW-SOF
STL-SOF
What is the cheapest month to book a flight from Illinois to Sofia?
Currently, November is the cheapest month in which you can book a flight from Illinois to Sofia (average of $472). Flying from Illinois to Sofia in June is currently the most expensive (average of $821). 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?
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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Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.
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Complete your trip
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Sofia flight routes
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 April 5, 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 April 5, 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 2,558,603 searches. Data last updated April 5, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$425 | Average$654 | FlexibilityNo cancel fee | On-time75% | |
| Cheapest$508 | Average$1,097 | FlexibilityNo cancel fee | On-time81% | |
| Cheapest$521 | Average$695 | FlexibilityNo cancel fee | On-time77% | |
| Cheapest$561 | Average$803 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$565 | Average$748 | FlexibilityNo cancel fee | On-time79% | |
| Cheapest$574 | Average$649 | FlexibilityNo cancel fee | On-time70% | |
| Cheapest$575 | Average$847 | FlexibilityNo cancel fee | On-time78% | |
| Cheapest$582 | Average$868 | FlexibilityNo cancel fee | On-time76% | |
| Cheapest$583 | Average$878 | FlexibilityNo cancel fee | On-time81% | |
| Cheapest$585 | Average$624 | FlexibilityNo cancel fee | On-time77% |