$136+ Cheap flights from Ontario to Illinois
This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 9/19. Fares are subject to change and may not be available on all flights or dates of travel.
YYZ — ORD
Aug 30 — Sep 61
Round-trip
1 adult, Economy
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Find cheap flights from Ontario to Illinois with Cheapflights
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Cheapest flights from Ontario to IllinoisExplore the most affordable flight options available from Ontario to Illinois. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 31, 2026.
Explore the most affordable flight options available from Ontario to Illinois. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 31, 2026.
This United Airlines deal was found by Cheapflights users on 7/30. 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.
Fri 9/48:50 am
YYZ
- ORD
Nonstop2h 03m
United Airlines
Tue 9/89:18 pm
ORD
- YYZ
Nonstop1h 41m
United Airlines
Deal found 7/30![United Airlines logo]()
$204
This Trip.com deal was found by Cheapflights users on 7/26. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/94:00 pm
YYZ
- ORD
1 stop5h 12m
Air Canada
Wed 9/163:45 pm
ORD
- YYZ
Nonstop1h 45m
Air Canada
Deal found 7/26![Air Canada logo]()
$205
This Trip.com deal was found by Cheapflights users on 7/29. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/318:55 am
YTZ
- MDW
Nonstop1h 50m
Porter Airlines
Wed 9/23:20 pm
MDW
- YTZ
Nonstop1h 40m
Porter Airlines
Deal found 7/29![Porter Airlines logo]()
$205
This Trip.com deal was found by Cheapflights users on 7/27. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/106:50 pm
YYZ
- ORD
Nonstop1h 58m
Air Canada
Sun 9/135:35 pm
ORD
- YYZ
Nonstop1h 43m
Air Canada
Deal found 7/27![Air Canada logo]()
$206
This Trip.com deal was found by Cheapflights users on 7/29. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/278:55 am
YTZ
- MDW
Nonstop1h 50m
Porter Airlines
Wed 9/211:45 am
MDW
- YTZ
Nonstop1h 40m
Porter Airlines
Deal found 7/29![Porter Airlines logo]()
$206
This Trip.com deal was found by Cheapflights users on 7/30. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/209:30 am
YTZ
- ORD
1 stop6h 14m
Air Canada
Sun 8/238:40 am
ORD
- YTZ
1 stop6h 11m
Air Canada
Deal found 7/30![Air Canada logo]()
$206
This Air Canada deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/42:00 pm
YYZ
- ORD
Nonstop1h 55m
Air Canada
Tue 9/88:40 pm
ORD
- YYZ
Nonstop1h 46m
Air Canada
Deal found 7/30![Air Canada logo]()
$207
This Trip.com deal was found by Cheapflights users on 7/30. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/288:55 am
YTZ
- MDW
Nonstop1h 50m
Porter Airlines
Wed 9/23:20 pm
MDW
- YTZ
Nonstop1h 40m
Porter Airlines
Deal found 7/30![Porter Airlines logo]()
$207
This Trip.com deal was found by Cheapflights users on 7/26. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/254:00 pm
YYZ
- ORD
Nonstop1h 58m
Air Canada
Mon 9/288:40 pm
ORD
- YYZ
Nonstop1h 46m
Air Canada
Deal found 7/26![Air Canada logo]()
$208
This Trip.com deal was found by Cheapflights users on 7/30. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/298:50 am
YTZ
- MDW
Nonstop1h 50m
Porter Airlines
Tue 9/811:45 am
MDW
- YTZ
Nonstop1h 40m
Porter Airlines
Deal found 7/30![Porter Airlines logo]()
$208
This Trip.com deal was found by Cheapflights users on 7/29. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/47:45 pm
YTZ
- ORD
Nonstop2h 06m
Air Canada
Sun 9/67:25 am
ORD
- YTZ
Nonstop1h 42m
Air Canada
Deal found 7/29![Air Canada logo]()
$208
This United Airlines deal was found by Cheapflights users on 7/28. 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.
Fri 9/411:00 am
YYZ
- ORD
Nonstop2h 00m
United Airlines
Wed 9/912:59 pm
ORD
- YYZ
Nonstop1h 47m
United Airlines
Deal found 7/28![United Airlines logo]()
$209
Best flights from Ontario to IllinoisDiscover carefully curated flight deals from Ontario to Illinois that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated July 31, 2026.
Discover carefully curated flight deals from Ontario to Illinois that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated July 31, 2026.
This FlightHub deal was found by Cheapflights users on 7/30. 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.
Thu 8/208:55 am
YTZ
- MDW
Nonstop1h 50m
Multiple Airlines
Sun 8/2310:20 am
MDW
- YTZ
Nonstop1h 40m
Multiple Airlines
Deal found 7/30![Multiple Airlines logo]()
$212
This Porter Airlines deal was found by Cheapflights users on 7/28. 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 Porter Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/91:45 pm
YTZ
- MDW
Nonstop1h 50m
Porter Airlines
Sun 9/133:20 pm
MDW
- YTZ
Nonstop1h 40m
Porter Airlines
Deal found 7/28![Porter Airlines logo]()
$228
This Delta deal was found by Cheapflights users on 7/30. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/212:09 pm
YYZ
- MDW
1 stop5h 50m
Delta
Sat 9/125:37 pm
MDW
- YYZ
1 stop4h 22m
Delta
Deal found 7/30![Delta logo]()
$235
This United Airlines deal was found by Cheapflights users on 7/30. 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.
Fri 8/2111:00 am
YYZ
- ORD
Nonstop2h 00m
United Airlines
Sun 8/236:30 am
ORD
- YYZ
1 stop11h 32m
United Airlines
Deal found 7/30![United Airlines logo]()
$236
This American Airlines deal was found by Cheapflights users on 7/25. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/81:15 pm
YYZ
- STL
1 stop11h 59m
American Airlines
Fri 9/115:00 am
STL
- YYZ
1 stop8h 32m
American Airlines
Deal found 7/25![American Airlines logo]()
$329
This United deal was found by Cheapflights users on 7/25. 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 United is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/111:00 am
YYZ
- ORD
Nonstop2h 00m
Multiple Airlines
Wed 9/303:40 pm
ORD
- YYZ
1 stop6h 38m
Multiple Airlines
Deal found 7/25![Multiple Airlines logo]()
$218
This Porter Airlines deal was found by Cheapflights users on 7/27. 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 Porter Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/81:45 pm
YTZ
- MDW
Nonstop1h 50m
Porter Airlines
Sun 9/133:20 pm
MDW
- YTZ
Nonstop1h 40m
Porter Airlines
Deal found 7/27![Porter Airlines logo]()
$228
This Delta deal was found by Cheapflights users on 7/30. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/216:00 am
YYZ
- MDW
1 stop4h 17m
Delta
Sat 10/316:44 pm
MDW
- YYZ
1 stop3h 12m
Delta
Deal found 7/30![Delta logo]()
$235
This United Airlines deal was found by Cheapflights users on 7/30. 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.
Mon 9/149:00 pm
YYZ
- ORD
Nonstop2h 05m
United Airlines
Wed 9/168:45 am
ORD
- YYZ
1 stop9h 17m
United Airlines
Deal found 7/30![United Airlines logo]()
$236
This Air Canada deal was found by Cheapflights users on 7/26. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/272:00 pm
YYZ
- STL
1 stop5h 42m
Air Canada
Thu 9/38:55 am
STL
- YYZ
Nonstop1h 57m
Air Canada
Deal found 7/26![Air Canada logo]()
$478
This United deal was found by Cheapflights users on 7/30. 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.
Wed 9/29:00 pm
YYZ
- ORD
Nonstop2h 05m
Multiple Airlines
Sat 9/125:35 pm
ORD
- YYZ
Nonstop1h 43m
Multiple Airlines
Deal found 7/30![Multiple Airlines logo]()
$229
This oojo deal was found by Cheapflights users on 7/25. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/712:10 pm
YYZ
- STL
1 stop6h 01m
WestJet
Fri 10/96:00 pm
STL
- YYZ
1 stop4h 01m
WestJet
Deal found 7/25![WestJet logo]()
$506
This Trip.com deal was found by Cheapflights users on 7/29. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/278:55 am
YTZ
- MDW
Nonstop1h 50m
Porter Airlines
Thu 9/33:20 pm
MDW
- YTZ
Nonstop1h 40m
Porter Airlines
Deal found 7/29![Porter Airlines logo]()
$234
This Delta deal was found by Cheapflights users on 7/26. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/912:08 pm
YYZ
- ORD
1 stop5h 05m
Delta
Wed 9/165:10 pm
ORD
- YYZ
1 stop4h 49m
Delta
Deal found 7/26![Delta logo]()
$243
This United Airlines deal was found by Cheapflights users on 7/29. 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.
Fri 9/187:43 pm
YYZ
- ORD
1 stop4h 57m
United Airlines
Tue 9/295:53 pm
ORD
- YYZ
Nonstop1h 51m
United Airlines
Deal found 7/29![United Airlines logo]()
$250
This United deal was found by Cheapflights users on 7/29. 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 is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/178:00 pm
YYZ
- ORD
1 stop5h 28m
Multiple Airlines
Sun 9/203:40 pm
ORD
- YYZ
1 stop6h 38m
Multiple Airlines
Deal found 7/29![Multiple Airlines logo]()
$241
This Delta deal was found by Cheapflights users on 7/28. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/86:00 am
YYZ
- ORD
1 stop7h 59m
Delta
Thu 9/107:05 am
ORD
- YYZ
1 stop3h 13m
Delta
Deal found 7/28![Delta logo]()
$243
This Cheapflightsfares deal was found by Cheapflights users on 7/27. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/121:45 pm
YTZ
- MDW
Nonstop1h 50m
Porter Airlines
Sat 8/1510:20 am
MDW
- YTZ
Nonstop1h 40m
Porter Airlines
Deal found 7/27![Porter Airlines logo]()
$256
This United Airlines deal was found by Cheapflights users on 7/30. 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 9/127:30 am
YYZ
- ORD
1 stop5h 38m
United Airlines
Sun 9/136:30 am
ORD
- YYZ
1 stop11h 32m
United Airlines
Deal found 7/30![United Airlines logo]()
$258
This Delta deal was found by Cheapflights users on 7/29. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/1212:08 pm
YYZ
- MDW
1 stop5h 49m
Delta
Sat 9/199:29 am
MDW
- YYZ
1 stop6h 51m
Delta
Deal found 7/29![Delta logo]()
$243
This Porter Airlines deal was found by Cheapflights users on 7/27. 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 Porter Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/278:55 am
YTZ
- MDW
Nonstop1h 50m
Porter Airlines
Mon 8/313:15 pm
MDW
- YTZ
Nonstop1h 40m
Porter Airlines
Deal found 7/27![Porter Airlines logo]()
$267
This United deal was found by Cheapflights users on 7/26. 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 is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/269:45 am
YUL
- ORD
Nonstop2h 36m
Multiple Airlines
Wed 9/28:40 am
ORD
- YUL
Nonstop2h 19m
Multiple Airlines
Deal found 7/26![Multiple Airlines logo]()
$287
This United Airlines deal was found by Cheapflights users on 7/30. 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 8/227:35 pm
YTZ
- ORD
Nonstop2h 06m
United Airlines
Sat 8/2912:56 pm
ORD
- YTZ
1 stop5h 00m
United Airlines
Deal found 7/30![United Airlines logo]()
$287
This Delta deal was found by Cheapflights users on 7/27. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/249:45 am
YYZ
- ORD
1 stop7h 32m
Delta
Thu 8/271:59 pm
ORD
- YYZ
1 stop8h 04m
Delta
Deal found 7/27![Delta logo]()
$276
This Porter Airlines deal was found by Cheapflights users on 7/30. 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 Porter Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/258:55 am
YTZ
- MDW
Nonstop1h 50m
Porter Airlines
Sat 10/103:20 pm
MDW
- YTZ
Nonstop1h 40m
Porter Airlines
Deal found 7/30![Porter Airlines logo]()
$276
This United deal was found by Cheapflights users on 7/26. 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 is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/147:00 am
YYZ
- ORD
Nonstop2h 00m
Multiple Airlines
Wed 8/262:15 pm
ORD
- YYZ
Nonstop1h 46m
Multiple Airlines
Deal found 7/26![Multiple Airlines logo]()
$293
This United Airlines deal was found by Cheapflights users on 7/29. 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 8/244:55 pm
YUL
- ORD
Nonstop2h 48m
United Airlines
Fri 8/282:01 pm
ORD
- YUL
Nonstop2h 29m
United Airlines
Deal found 7/29![United Airlines logo]()
$299
This Delta deal was found by Cheapflights users on 7/28. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/2012:09 pm
YYZ
- MDW
1 stop7h 24m
Delta
Sat 8/221:25 pm
MDW
- YYZ
1 stop8h 34m
Delta
Deal found 7/28![Delta logo]()
$281
This Porter Airlines deal was found by Cheapflights users on 7/27. 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 Porter Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/2810:10 am
YTZ
- MDW
Nonstop1h 50m
Porter Airlines
Thu 10/111:45 am
MDW
- YTZ
Nonstop1h 40m
Porter Airlines
Deal found 7/27![Porter Airlines logo]()
$287
This United deal was found by Cheapflights users on 7/27. 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 United is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/296:10 am
YUL
- ORD
Nonstop2h 41m
Multiple Airlines
Fri 9/112:00 pm
ORD
- YUL
1 stop4h 45m
Multiple Airlines
Deal found 7/27![Multiple Airlines logo]()
$299
Last-minute flights from Ontario to IllinoisDiscover last-minute flight deals from Ontario to Illinois. Data last updated July 31, 2026 and is based on user searches.
Discover last-minute flight deals from Ontario to Illinois. Data last updated July 31, 2026 and is based on user searches.
This FlightHub deal was found by Cheapflights users on 7/30. 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.
Tue 8/181:45 pm
YTZ
- MDW
Nonstop1h 50m
Porter Airlines
Sat 8/2210:20 am
MDW
- YTZ
Nonstop1h 40m
Porter Airlines
Deal found 7/30![Porter Airlines logo]()
$209
This Cheapflightsfares deal was found by Cheapflights users on 7/26. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/181:45 pm
YTZ
- MDW
Nonstop1h 50m
Porter Airlines
Thu 8/2010:25 am
MDW
- YTZ
Nonstop1h 40m
Porter Airlines
Deal found 7/26![Porter Airlines logo]()
$211
This Trip.com deal was found by Cheapflights users on 7/30. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/209:30 am
YTZ
- ORD
1 stop6h 14m
Air Canada
Sun 8/238:40 am
ORD
- YTZ
1 stop6h 11m
Air Canada
Deal found 7/30![Air Canada logo]()
$206
This FlightHub deal was found by Cheapflights users on 7/30. 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.
Thu 8/208:55 am
YTZ
- MDW
Nonstop1h 50m
Multiple Airlines
Sun 8/2310:20 am
MDW
- YTZ
Nonstop1h 40m
Multiple Airlines
Deal found 7/30![Multiple Airlines logo]()
$212
This Super.com deal was found by Cheapflights users on 7/27. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/248:55 am
YTZ
- MDW
Nonstop1h 50m
Porter Airlines
Mon 8/3110:25 am
MDW
- YTZ
Nonstop1h 40m
Porter Airlines
Deal found 7/27![Porter Airlines logo]()
$217
This Trip.com deal was found by Cheapflights users on 7/29. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/278:55 am
YTZ
- MDW
Nonstop1h 50m
Porter Airlines
Wed 9/211:45 am
MDW
- YTZ
Nonstop1h 40m
Porter Airlines
Deal found 7/29![Porter Airlines logo]()
$206
This Trip.com deal was found by Cheapflights users on 7/30. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/288:55 am
YTZ
- MDW
Nonstop1h 50m
Porter Airlines
Wed 9/23:20 pm
MDW
- YTZ
Nonstop1h 40m
Porter Airlines
Deal found 7/30![Porter Airlines logo]()
$207
This Air Canada deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/294:00 pm
YYZ
- ORD
Nonstop1h 57m
Air Canada
Tue 9/12:15 pm
ORD
- YYZ
Nonstop1h 46m
Air Canada
Deal found 7/30![Air Canada logo]()
$207
This Trip.com deal was found by Cheapflights users on 7/30. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/298:50 am
YTZ
- MDW
Nonstop1h 50m
Porter Airlines
Tue 9/811:45 am
MDW
- YTZ
Nonstop1h 40m
Porter Airlines
Deal found 7/30![Porter Airlines logo]()
$208
This Trip.com deal was found by Cheapflights users on 7/26. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/297:35 pm
YTZ
- ORD
Nonstop2h 06m
Air Canada
Tue 9/12:00 pm
ORD
- YTZ
Nonstop1h 42m
Air Canada
Deal found 7/26![Air Canada logo]()
$214
This SmartFares deal was found by Cheapflights users on 7/28. 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 SmartFares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/297:35 pm
YTZ
- ORD
Nonstop2h 06m
Air Canada
Mon 8/317:25 am
ORD
- YTZ
Nonstop1h 53m
Air Canada
Deal found 7/28![Air Canada logo]()
$215
This Trip.com deal was found by Cheapflights users on 7/29. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/318:55 am
YTZ
- MDW
Nonstop1h 50m
Porter Airlines
Wed 9/23:20 pm
MDW
- YTZ
Nonstop1h 40m
Porter Airlines
Deal found 7/29![Porter Airlines logo]()
$205
One-way flights from Ontario to IllinoisSearch for one-way flight options from Ontario to Illinois. Find affordable one-way fares based on user searches. Data last updated July 31, 2026.
Search for one-way flight options from Ontario to Illinois. Find affordable one-way fares based on user searches. Data last updated July 31, 2026.
This Air Canada deal was found by Cheapflights users on 7/27. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/512:25 pm
YYZ
- ORD
Nonstop1h 57m
Air Canada
Deal found 7/27![Air Canada logo]()
$136
This Trip.com deal was found by Cheapflights users on 7/29. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/288:55 am
YTZ
- MDW
Nonstop1h 50m
Porter Airlines
Deal found 7/29![Porter Airlines logo]()
$136
This Air Canada deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/27:35 pm
YTZ
- ORD
Nonstop2h 06m
Air Canada
Deal found 7/30![Air Canada logo]()
$136
This Kiwi.com deal was found by Cheapflights users on 7/29. 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.
Mon 9/281:30 pm
YYZ
- ORD
1 stop26h 50m
Multiple Airlines
Deal found 7/29![Multiple Airlines logo]()
$137
This Flightnetwork deal was found by Cheapflights users on 7/27. 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 Flightnetwork is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/298:50 am
YTZ
- MDW
Nonstop1h 50m
Porter Airlines
Deal found 7/27![Porter Airlines logo]()
$137
This Air Canada deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/199:00 am
YYZ
- ORD
1 stop6h 52m
Air Canada
Deal found 7/30![Air Canada logo]()
$138
This Cheapflightsfares deal was found by Cheapflights users on 7/28. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/31:45 pm
YTZ
- MDW
Nonstop1h 50m
Porter Airlines
Deal found 7/28![Porter Airlines logo]()
$138
This Goibibo deal was found by Cheapflights users on 7/29. 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 Goibibo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/1110:20 am
YTZ
- ORD
2 stops10h 52m
Air Canada
Deal found 7/29![Air Canada logo]()
$138
This Air Canada deal was found by Cheapflights users on 7/29. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/112:25 pm
YYZ
- ORD
Nonstop1h 57m
Air Canada
Deal found 7/29![Air Canada logo]()
$139
This Trip.com deal was found by Cheapflights users on 7/27. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/248:55 am
YTZ
- MDW
Nonstop1h 50m
Porter Airlines
Deal found 7/27![Porter Airlines logo]()
$139
This Mytrip deal was found by Cheapflights users on 7/26. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/299:30 am
YTZ
- ORD
1 stop6h 22m
Air Canada
Deal found 7/26![Air Canada logo]()
$139
This Air Canada deal was found by Cheapflights users on 7/26. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/66:15 am
YYZ
- ORD
1 stop5h 04m
Air Canada
Deal found 7/26![Air Canada logo]()
$140
Find flight deals from Ontario to Illinois
Keep the following information in mind while searching for Ontario to Illinois flight deals. Data was last updated July 31, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $204 (United Airlines) |
One-way from | $136 (Air Canada) |
Popular in | May |
Cheapest in | September |
Average price | $283 |
Good round-trip deal | $205 or less |
Good one-way deal | $136 or less |
Cheapflights Fare Finder
Customize your flight search to find flights from Ontario to Illinois that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated July 31, 2026.
Use the filters below to find and compare flights from Ontario to Illinois that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
Quickest round-trip
TorontoChicago
YTZ - MDW
YTZMDW
Toronto Island
Thu 8/20
8:55 am-9:45 am
Nonstop1h 50m
Chicago Midway
Sun 8/23
10:20 am-1:00 pm
Nonstop1h 40m
$212
TorontoChicago
YYZ - ORD
YYZORD
Toronto Pearson Intl
Tue 9/1
11:00 am-12:00 pm
Nonstop2h 00m
Chicago O'Hare Intl
Wed 9/30
3:40 pm-11:18 pm
1 stop6h 38m
$218
TorontoChicago
YTZ - MDW
YTZMDW
Toronto Island
Wed 9/9
1:45 pm-2:35 pm
Nonstop1h 50m
Chicago Midway
Sun 9/13
3:20 pm-6:00 pm
Nonstop1h 40m
$228
TorontoChicago
YTZ - MDW
YTZMDW
Toronto Island
Tue 9/8
1:45 pm-2:35 pm
Nonstop1h 50m
Chicago Midway
Sun 9/13
3:20 pm-6:00 pm
Nonstop1h 40m
$228
TorontoChicago
YYZ - ORD
YYZORD
Toronto Pearson Intl
Wed 9/2
9:00 pm-10:05 pm
Nonstop2h 05m
Chicago O'Hare Intl
Sat 9/12
5:35 pm-8:18 pm
Nonstop1h 43m
$229
TorontoChicago
YTZ - MDW
YTZMDW
Toronto Island
Thu 8/27
8:55 am-9:45 am
Nonstop1h 50m
Chicago Midway
Thu 9/3
3:20 pm-6:00 pm
Nonstop1h 40m
$234
TorontoChicago
YYZ - MDW
YYZMDW
Toronto Pearson Intl
Wed 9/2
12:09 pm-4:59 pm
1 stop5h 50m
Chicago Midway
Sat 9/12
5:37 pm-10:59 pm
1 stop4h 22m
$235
TorontoChicago
YYZ - MDW
YYZMDW
Toronto Pearson Intl
Wed 10/21
6:00 am-9:17 am
1 stop4h 17m
Chicago Midway
Sat 10/31
6:44 pm-10:56 pm
1 stop3h 12m
$235
TorontoChicago
YYZ - ORD
YYZORD
Toronto Pearson Intl
Fri 8/21
11:00 am-12:00 pm
Nonstop2h 00m
Chicago O'Hare Intl
Sun 8/23
6:30 am-7:02 pm
1 stop11h 32m
$236
TorontoChicago
YYZ - ORD
YYZORD
Toronto Pearson Intl
Mon 9/14
9:00 pm-10:05 pm
Nonstop2h 05m
Chicago O'Hare Intl
Wed 9/16
8:45 am-7:02 pm
1 stop9h 17m
$236
Showing 1-10 of 60 resultsSorted by cheapest first
Best time to book a flight from Ontario to Illinois
Have a flexible travel schedule? Discover the best time to fly to Illinois from Ontario with our price prediction graph.
YTZ-MDW
YYZ-MDW
YYZ-ORD
YYZ-STL
YUL-ORD
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 Ontario to Illinois
CAON-USIL
YTZ-MDW
YYZ-MDW
YYZ-ORD
YYZ-STL
What is the cheapest month to book a flight from Region of Ontario to Illinois?
Currently, January is the cheapest month in which you can book a flight from Region of Ontario to Illinois (average of $259). Flying from Region of Ontario to Illinois in December is currently the most expensive (average of $319). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.
What is the cheapest time of day to fly from ON to IL?
Find hourly flight availability from Ontario to Illinois. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated July 31, 2026.
One of the essential ways to save on airfare from Region of Ontario to Illinois is to remain as flexible as possible. Flights that are in the afternoon tend to be the most expensive. A flight at noon could potentially save you up to 32% on airfare.
Weekly flight availability from Region of Ontario to Illinois
Explore weekly flight availability from Ontario to Illinois. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated July 31, 2026.
The most flights from CAON to USIL are scheduled on a Thursday (71 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (33 on average).
How much does it cost to fly round-trip from Region of Ontario to Illinois?
Airfare is below average for this route at the moment.
Region of Ontario to Illinois flights typically cost between $254 and $384 in September.The cheapest round-trip price found within the last 5 days was $204 on United Airlines (Sep 4-Sep 8).
How far ahead should I book a flight from Region of Ontario to Illinois?
The best time to book flights from Region of Ontario to Illinois is 87 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.
What is the cheapest day to fly from Region of Ontario to Illinois?
Use this chart to determine the cheapest time to fly round-trip from Ontario to Illinois. Price data was last updated on July 25, 2026.
Travelers seeking maximum savings on their Region of Ontario to Illinois flight should consider departing on Sunday at noon when fares are most often at their lowest. Friday afternoons flights should be avoided if possible as fares are typically the most expensive at this time.
Reviews of airlines servicing Illinois
Get insights into the airlines that provide service to Illinois. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Illinois. Reviews last updated July 31, 2026.
See what other customers who have flown with Porter Airlines,United Airlines, andAmerican Airlines from Ontario to Illinois have to say. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Entertainment
6.9
Crew
8.6
Boarding
8.2
Comfort
8.0
Overall
8.0
Food
7.5
Reviews
1 / 20
6.0
GoodShannon,Jul 2026
YQT - YOW
Entertainment
6.9
Crew
8.6
Boarding
8.2
Comfort
8.0
Overall
8.0
Food
7.5
Reviews
1 / 20
6.0
GoodShannon,Jul 2026
YQT - YOW
Entertainment
6.9
Crew
8.6
Boarding
8.2
Comfort
8.0
Overall
8.0
Food
7.5
Reviews
1 / 20
6.0
GoodShannon,Jul 2026
YQT - YOW
Entertainment
6.9
Crew
8.6
Boarding
8.2
Comfort
8.0
Overall
8.0
Food
7.5
Reviews
1 / 20
6.0
GoodShannon,Jul 2026
YQT - YOW
Entertainment
6.9
Crew
8.6
Boarding
8.2
Comfort
8.0
Overall
8.0
Food
7.5
Reviews
1 / 20
6.0
GoodShannon,Jul 2026
YQT - YOW
Related info for your journey
Find useful and relevant information for your journey from Ontario to Illinois. 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 Ontario to Illinois
See prices for flight routes from nearby airports that may be better suited for you.
Complete your trip
Complete your trip to Illinois by adding a car rental and/or hotel reservation to your travel itinerary.
Search flights from Ontario to Illinois by cabin class
Find flights from Ontario to Illinois, based on your preferred cabin class, be it economy, premium economy, business, or first class.
Ontario and Illinois flights
Browse other Ontario and Illinois flight options. Last updated on July 31, 2026.
Popular flight searches
Check out other popular destinations found by fellow travelers in 2026
Find a return flight route from Illinois
Find the right flight back to Ontario after your stay in Illinois
Ontario to Illinois flights
Consider these flights traveling from Ontario to Illinois.
Top 4 airlines flying from Ontario to Illinois
Discover the top 4 airlines that operate flights from Ontario to Illinois. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated July 31, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$137 | Average$291 | FlexibilityNo cancel fee | On-time67% | |
| Cheapest$168 | Average$370 | FlexibilityNo cancel fee | On-time52% | |
| Cheapest$189 | Average$294 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$189 | Average$473 | FlexibilityNo cancel fee | On-time69% |