$333+ Cheap flights from Green Bay (GRB) to Ontario
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 10/19. Fares are subject to change and may not be available on all flights or dates of travel.
GRB — YYZ
Sep 20 — Sep 271
Round-trip
1 adult, Economy
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Find cheap flights from Green Bay to Ontario 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 Green Bay to Ontario
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Cheapest flights from Green Bay to OntarioExplore the most affordable flight options available from Green Bay to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on August 21, 2026.
Explore the most affordable flight options available from Green Bay to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on August 21, 2026.
This American Airlines deal was found by Cheapflights users on 8/18. 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 9/158:27 pm -
1 stop15h 08m
Tue 9/226:30 am -
1 stop18h 43m
Deal found 8/18![American Airlines logo]()
$513
This American Airlines deal was found by Cheapflights users on 8/18. 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.
Fri 9/188:27 pm -
1 stop15h 08m
Sun 9/206:30 am -
1 stop18h 43m
Deal found 8/18![American Airlines logo]()
$565
This American Airlines deal was found by Cheapflights users on 8/19. 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.
Sat 9/195:43 am -
2 stops12h 02m
Sat 9/266:25 pm -
1 stop16h 10m
Deal found 8/19![American Airlines logo]()
$575
This American Airlines deal was found by Cheapflights users on 8/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/310:05 am -
1 stop24h 39m
Wed 10/75:34 pm -
1 stop16h 48m
Deal found 8/16![American Airlines logo]()
$618
This American Airlines deal was found by Cheapflights users on 8/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/155:43 am -
2 stops14h 59m
Tue 9/2212:31 pm -
1 stop12h 42m
Deal found 8/17![American Airlines logo]()
$622
This United Airlines deal was found by Cheapflights users on 8/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/56:25 am -
2 stops8h 45m
Sat 9/123:25 pm -
2 stops8h 54m
Deal found 8/17![United Airlines logo]()
$623
This American Airlines deal was found by Cheapflights users on 8/19. 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.
Sat 10/310:05 am -
1 stop12h 21m
Sat 10/103:14 pm -
1 stop19h 08m
Deal found 8/19![American Airlines logo]()
$633
This Justfly.com deal was found by Cheapflights users on 8/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Justfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/304:51 pm -
1 stop5h 24m
Fri 11/66:00 am -
1 stop12h 21m
Deal found 8/19![WestJet logo]()
$635
This United Airlines deal was found by Cheapflights users on 8/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/83:44 pm -
1 stop4h 17m
Wed 12/96:10 am -
1 stop6h 55m
Deal found 8/16![United Airlines logo]()
$643
This American Airlines deal was found by Cheapflights users on 8/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/108:27 pm -
1 stop14h 17m
Mon 9/145:34 pm -
1 stop17h 01m
Deal found 8/17![American Airlines logo]()
$645
This American Airlines deal was found by Cheapflights users on 8/19. 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.
Fri 10/98:04 pm -
1 stop13h 55m
Mon 10/1211:40 am -
1 stop13h 32m
Deal found 8/19![American Airlines logo]()
$654
This United Airlines deal was found by Cheapflights users on 8/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/15:00 am -
1 stop4h 40m
Thu 10/89:45 am -
1 stop14h 34m
Deal found 8/16![United Airlines logo]()
$667
Best flights from Green Bay to OntarioDiscover carefully curated flight deals from Green Bay to Ontario that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated August 21, 2026.
Discover carefully curated flight deals from Green Bay to Ontario that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated August 21, 2026.
This American Airlines deal was found by Cheapflights users on 8/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/310:05 am -
1 stop24h 39m
Wed 10/75:34 pm -
1 stop16h 48m
Deal found 8/16![American Airlines logo]()
$618
This United Airlines deal was found by Cheapflights users on 8/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/56:25 am -
2 stops8h 45m
Sat 9/123:25 pm -
2 stops8h 54m
Deal found 8/17![United Airlines logo]()
$623
This American Airlines deal was found by Cheapflights users on 8/19. 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.
Sat 9/195:43 am -
2 stops11h 59m
Sat 9/262:15 pm -
2 stops10h 58m
Deal found 8/19![American Airlines logo]()
$648
This United Airlines deal was found by Cheapflights users on 8/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/88:25 am -
2 stops10h 13m
Wed 12/97:00 am -
2 stops10h 43m
Deal found 8/17![United Airlines logo]()
$658
This American Airlines deal was found by Cheapflights users on 8/19. 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.
Sat 10/35:43 am -
2 stops12h 02m
Sat 10/103:29 pm -
2 stops9h 43m
Deal found 8/19![American Airlines logo]()
$651
This United Airlines deal was found by Cheapflights users on 8/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/15:00 am -
1 stop4h 40m
Thu 10/89:45 am -
1 stop14h 34m
Deal found 8/16![United Airlines logo]()
$667
This American Airlines deal was found by Cheapflights users on 8/19. 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.
Fri 10/98:04 pm -
1 stop13h 55m
Mon 10/1211:40 am -
1 stop13h 32m
Deal found 8/19![American Airlines logo]()
$654
This United Airlines deal was found by Cheapflights users on 8/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/810:37 am -
1 stop7h 08m
Wed 11/1110:53 am -
1 stop6h 59m
Deal found 8/17![United Airlines logo]()
$672
This American Airlines deal was found by Cheapflights users on 8/19. 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.
Mon 11/168:27 pm -
1 stop14h 03m
Wed 11/1812:10 pm -
1 stop7h 10m
Deal found 8/19![American Airlines logo]()
$671
This United Airlines deal was found by Cheapflights users on 8/20. 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 1/93:44 pm -
1 stop4h 50m
Wed 1/137:00 am -
1 stop4h 30m
Deal found 8/20![United Airlines logo]()
$673
This American Airlines deal was found by Cheapflights users on 8/18. 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.
Fri 1/228:15 pm -
1 stop15h 19m
Sun 1/2412:30 pm -
2 stops12h 42m
Deal found 8/18![American Airlines logo]()
$679
This United Airlines deal was found by Cheapflights users on 8/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/71:58 pm -
1 stop6h 18m
Wed 11/114:46 pm -
1 stop6h 27m
Deal found 8/16![United Airlines logo]()
$700
Last-minute flights from Green Bay to OntarioDiscover last-minute flight deals from Green Bay to Ontario. Data last updated August 21, 2026 and is based on user searches.
Discover last-minute flight deals from Green Bay to Ontario. Data last updated August 21, 2026 and is based on user searches.
This American Airlines deal was found by Cheapflights users on 8/19. 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.
Wed 8/265:55 am -
2 stops11h 50m
Wed 9/22:15 pm -
2 stops11h 01m
Deal found 8/19![American Airlines logo]()
$734
This United Airlines deal was found by Cheapflights users on 8/21. 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 8/2812:30 pm -
2 stops8h 03m
Tue 9/18:10 am -
2 stops6h 45m
Deal found 8/21![United Airlines logo]()
$893
This United Airlines deal was found by Cheapflights users on 8/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/56:25 am -
2 stops8h 45m
Sat 9/123:25 pm -
2 stops8h 54m
Deal found 8/17![United Airlines logo]()
$623
This American Airlines deal was found by Cheapflights users on 8/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/108:27 pm -
1 stop14h 17m
Mon 9/145:34 pm -
1 stop17h 01m
Deal found 8/17![American Airlines logo]()
$645
This United Airlines deal was found by Cheapflights users on 8/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/108:05 am -
2 stops10h 40m
Mon 9/143:25 pm -
2 stops8h 54m
Deal found 8/17![United Airlines logo]()
$701
This American Airlines deal was found by Cheapflights users on 8/18. 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 9/158:27 pm -
1 stop15h 08m
Tue 9/226:30 am -
1 stop18h 43m
Deal found 8/18![American Airlines logo]()
$513
This American Airlines deal was found by Cheapflights users on 8/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/155:43 am -
2 stops14h 59m
Tue 9/2212:31 pm -
1 stop12h 42m
Deal found 8/17![American Airlines logo]()
$622
This American Airlines deal was found by Cheapflights users on 8/18. 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.
Fri 9/188:27 pm -
1 stop15h 08m
Sun 9/206:30 am -
1 stop18h 43m
Deal found 8/18![American Airlines logo]()
$565
This American Airlines deal was found by Cheapflights users on 8/19. 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.
Sat 9/195:43 am -
2 stops12h 02m
Sat 9/266:25 pm -
1 stop16h 10m
Deal found 8/19![American Airlines logo]()
$575
One-way flights from Green Bay to OntarioSearch for one-way flight options from Green Bay to Ontario. Find affordable one-way fares based on user searches. Data last updated August 21, 2026.
Search for one-way flight options from Green Bay to Ontario. Find affordable one-way fares based on user searches. Data last updated August 21, 2026.
This United Airlines deal was found by Cheapflights users on 8/20. 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 10/195:00 am -
1 stop3h 54m
Deal found 8/20![United Airlines logo]()
$333
This FlightHub deal was found by Cheapflights users on 8/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/2911:07 am -
1 stop11h 23m
Deal found 8/17![WestJet logo]()
$409
This FlightHub deal was found by Cheapflights users on 8/20. 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 9/14:13 pm -
1 stop6h 27m
Deal found 8/20![WestJet logo]()
$413
This United Airlines deal was found by Cheapflights users on 8/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/298:55 am -
2 stops9h 50m
Deal found 8/17![United Airlines logo]()
$419
This United Airlines deal was found by Cheapflights users on 8/20. 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 9/111:45 am -
3 stops19h 31m
Deal found 8/20![United Airlines logo]()
$907
Find flight deals from Green Bay to Ontario
Keep the following information in mind while searching for Green Bay to Ontario flight deals. Data was last updated August 21, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $513 (American Airlines) |
One-way from | $333 (United Airlines) |
Cheapflights Fare Finder
Customize your flight search to find flights from Green Bay to Ontario 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 21, 2026.
Use the filters below to find and compare flights from Green Bay to Ontario that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
Green BayMontreal
GRB Green Bay Austin-Straubel - YUL Montreal Pierre Elliott Trudeau Intl
GRBYUL
Green Bay Austin-Straubel
Sat 10/3
10:05 am-11:44 am
1 stop24h 39m
Montreal Pierre Elliott Trudeau Intl
Wed 10/7
5:34 pm-9:22 am
1 stop16h 48m
$618
Green BayMontreal
GRB Green Bay Austin-Straubel - YUL Montreal Pierre Elliott Trudeau Intl
GRBYUL
Green Bay Austin-Straubel
Sat 9/5
6:25 am-4:10 pm
2 stops8h 45m
Montreal Pierre Elliott Trudeau Intl
Sat 9/12
3:25 pm-11:19 pm
2 stops8h 54m
$623
Green BayToronto
GRB Green Bay Austin-Straubel - YYZ Toronto Pearson Intl
GRBYYZ
Green Bay Austin-Straubel
Sat 9/19
5:43 am-6:42 pm
2 stops11h 59m
Toronto Pearson Intl
Sat 9/26
2:15 pm-12:13 am
2 stops10h 58m
$648
Green BayToronto
GRB Green Bay Austin-Straubel - YYZ Toronto Pearson Intl
GRBYYZ
Green Bay Austin-Straubel
Sat 10/3
5:43 am-6:45 pm
2 stops12h 02m
Toronto Pearson Intl
Sat 10/10
3:29 pm-12:12 am
2 stops9h 43m
$651
Green BayToronto
GRB Green Bay Austin-Straubel - YYZ Toronto Pearson Intl
GRBYYZ
Green Bay Austin-Straubel
Fri 10/9
8:04 pm-10:59 am
1 stop13h 55m
Toronto Pearson Intl
Mon 10/12
11:40 am-12:12 am
1 stop13h 32m
$654
Green BayMontreal
GRB Green Bay Austin-Straubel - YUL Montreal Pierre Elliott Trudeau Intl
GRBYUL
Green Bay Austin-Straubel
Tue 12/8
8:25 am-7:38 pm
2 stops10h 13m
Montreal Pierre Elliott Trudeau Intl
Wed 12/9
7:00 am-4:43 pm
2 stops10h 43m
$658
Green BayMontreal
GRB Green Bay Austin-Straubel - YUL Montreal Pierre Elliott Trudeau Intl
GRBYUL
Green Bay Austin-Straubel
Thu 10/1
5:00 am-10:40 am
1 stop4h 40m
Montreal Pierre Elliott Trudeau Intl
Thu 10/8
9:45 am-11:19 pm
1 stop14h 34m
$667
Green BayMontreal
GRB Green Bay Austin-Straubel - YUL Montreal Pierre Elliott Trudeau Intl
GRBYUL
Green Bay Austin-Straubel
Mon 11/16
8:27 pm-11:30 am
1 stop14h 03m
Montreal Pierre Elliott Trudeau Intl
Wed 11/18
12:10 pm-6:20 pm
1 stop7h 10m
$671
Green BayToronto
GRB Green Bay Austin-Straubel - YYZ Toronto Pearson Intl
GRBYYZ
Green Bay Austin-Straubel
Sun 11/8
10:37 am-6:45 pm
1 stop7h 08m
Toronto Pearson Intl
Wed 11/11
10:53 am-4:52 pm
1 stop6h 59m
$672
Quickest round-trip
Green BayToronto
GRB Green Bay Austin-Straubel - YYZ Toronto Pearson Intl
GRBYYZ
Green Bay Austin-Straubel
Sat 1/9
3:44 pm-9:34 pm
1 stop4h 50m
Toronto Pearson Intl
Wed 1/13
7:00 am-10:30 am
1 stop4h 30m
$673
Showing 1-10 of 17 resultsSorted by cheapest first
Best time to book a flight from Green Bay to Ontario
Have a flexible travel schedule? Discover the best time to fly to Ontario from Green Bay with our price prediction graph.
GRB-YYZ
GRB-YUL
GRB-YOW
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 Green Bay to Ontario
GRB-CAON
GRB-YYZ
GRB-YUL
GRB-YOW
No data available for this route at this time. Please check back soon.
Related info for your journey
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