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$271+ 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 3/15. Fares are subject to change and may not be available on all flights or dates of travel.
GRB — YYZ
Mar 22 — Mar 291
Sun 3/22
Sun 3/29
1 adult, Economy
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Cheap flight deals from Green Bay to Ontario

Cheapest flights from Green Bay to Ontario
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 February 20, 2026.

This American Airlines deal was found by Cheapflights users on 2/18. 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.
Sat 4/45:00 am
GRB
-
YUL
1 stop8h 59m
American Airlines
Sat 4/1112:30 pm
YUL
-
GRB
1 stop12h 01m
American Airlines
Deal found 2/18$388
This American Airlines deal was found by Cheapflights users on 2/19. 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.
Sun 4/56:03 am
GRB
-
YYZ
1 stop14h 26m
American Airlines
Sun 4/121:15 pm
YYZ
-
GRB
1 stop9h 43m
American Airlines
Deal found 2/19$396
This American Airlines deal was found by Cheapflights users on 2/20. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/66:38 pm
GRB
-
YYZ
1 stop15h 15m
American Airlines
Mon 4/133:13 pm
YYZ
-
GRB
1 stop18h 59m
American Airlines
Deal found 2/20$420
This United Airlines deal was found by Cheapflights users on 2/16. 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 5/22:35 pm
GRB
-
YOW
1 stop6h 00m
United Airlines
Wed 5/610:44 am
YOW
-
GRB
1 stop9h 17m
United Airlines
Deal found 2/16$429
This American Airlines deal was found by Cheapflights users on 2/19. 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.
Thu 4/165:24 pm
GRB
-
YYZ
1 stop18h 11m
American Airlines
Mon 4/201:15 pm
YYZ
-
GRB
1 stop11h 16m
American Airlines
Deal found 2/19$473
This United Airlines deal was found by Cheapflights users on 2/18. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/182:54 pm
GRB
-
YOW
1 stop5h 24m
United Airlines
Wed 3/256:20 am
YOW
-
GRB
1 stop8h 46m
United Airlines
Deal found 2/18$490
This American Airlines deal was found by Cheapflights users on 2/19. 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 3/185:00 am
GRB
-
YYZ
1 stop11h 36m
American Airlines
Tue 4/71:15 pm
YYZ
-
GRB
1 stop9h 43m
American Airlines
Deal found 2/19$501
This American Airlines deal was found by Cheapflights users on 2/19. 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 5/3012:15 pm
GRB
-
YYZ
1 stop10h 14m
American Airlines
Tue 6/211:39 am
YYZ
-
GRB
1 stop13h 12m
American Airlines
Deal found 2/19$504
This American Airlines deal was found by Cheapflights users on 2/18. 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.
Wed 3/185:00 am
GRB
-
YOW
2 stops10h 48m
American Airlines
Wed 3/256:45 am
YOW
-
GRB
2 stops17h 47m
American Airlines
Deal found 2/18$513
This American Airlines deal was found by Cheapflights users on 2/18. 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 3/136:38 pm
GRB
-
YYZ
1 stop16h 52m
American Airlines
Thu 3/196:17 pm
YYZ
-
GRB
1 stop16h 09m
American Airlines
Deal found 2/18$519
This American Airlines deal was found by Cheapflights users on 2/16. 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.
Sun 4/265:24 pm
GRB
-
YUL
1 stop17h 20m
American Airlines
Fri 5/112:30 pm
YUL
-
GRB
1 stop21h 42m
American Airlines
Deal found 2/16$526
This United Airlines deal was found by Cheapflights users on 2/16. 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.
Fri 5/228:25 pm
GRB
-
YYZ
1 stop12h 29m
United Airlines
Tue 5/261:55 pm
YYZ
-
GRB
1 stop8h 35m
United Airlines
Deal found 2/16$555

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 February 20, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$388
(American Airlines)

One-way from

$271
(United Airlines)
Provider with most accurate pricing for Green Bay Austin-Straubel-Toronto (YTO) flight deals.
Search Deals
Provider most trusted by Cheapflights users for Green Bay Austin-Straubel-Toronto (YTO) flights.
Search Deals
From Green Bay Austin-Straubel to Ontario
Search Deals
One-way flight from Green Bay Austin-Straubel to Ontario
Search Deals

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 2,558,603 searches. Data last updated February 20, 2026.
Use the filters below to find and compare flights from Green Bay to Ontario that are best for you.

Fly from

Green Bay

Fly to

Ontario

Route

Depart

Return

Price

Green BayMontreal

GRB - YUL

GRBYUL

Green Bay Austin-Straubel

Sat 4/4

5:00 am-2:59 pm

1 stop8h 59m

Montreal Pierre Elliott Trudeau Intl

Sat 4/11

12:30 pm-11:31 pm

1 stop12h 01m

$388

Green BayToronto

GRB - YYZ

GRBYYZ

Green Bay Austin-Straubel

Thu 4/16

5:24 pm-12:35 pm

1 stop18h 11m

Toronto Pearson Intl

Sun 4/19

6:15 am-11:31 pm

1 stop18h 16m

$396

Green BayToronto

GRB - YYZ

GRBYYZ

Green Bay Austin-Straubel

Fri 4/17

5:24 pm-12:35 pm

1 stop18h 11m

Toronto Pearson Intl

Sun 4/19

6:15 am-11:31 pm

1 stop18h 16m

$396

Green BayOttawa

GRB - YOW

GRBYOW

Green Bay Austin-Straubel

Sat 5/2

2:35 pm-9:35 pm

1 stop6h 00m

Ottawa

Wed 5/6

10:44 am-7:01 pm

1 stop9h 17m

$429

Green BayToronto

GRB - YYZ

GRBYYZ

Green Bay Austin-Straubel

Thu 4/16

5:24 pm-12:35 pm

1 stop18h 11m

Toronto Pearson Intl

Mon 4/20

1:15 pm-11:31 pm

1 stop11h 16m

$473

Green BayOttawa

GRB - YOW

GRBYOW

Green Bay Austin-Straubel

Wed 3/18

2:54 pm-9:18 pm

1 stop5h 24m

Ottawa

Wed 3/25

6:20 am-2:06 pm

1 stop8h 46m

$490

Green BayToronto

GRB - YYZ

GRBYYZ

Green Bay Austin-Straubel

Sat 5/30

12:15 pm-11:29 pm

1 stop10h 14m

Toronto Pearson Intl

Tue 6/2

11:39 am-11:51 pm

1 stop13h 12m

$504

Green BayToronto

GRB - YYZ

GRBYYZ

Green Bay Austin-Straubel

Fri 3/13

6:38 pm-12:30 pm

1 stop16h 52m

Toronto Pearson Intl

Thu 3/19

6:17 pm-9:26 am

1 stop16h 09m

$519

Green BayMontreal

GRB - YUL

GRBYUL

Green Bay Austin-Straubel

Sun 4/26

5:24 pm-11:44 am

1 stop17h 20m

Montreal Pierre Elliott Trudeau Intl

Fri 5/1

12:30 pm-9:12 am

1 stop21h 42m

$526

Green BayToronto

GRB - YYZ

GRBYYZ

Green Bay Austin-Straubel

Wed 3/18

5:00 am-4:03 pm

1 stop10h 03m

Toronto Pearson Intl

Tue 4/7

7:15 pm-9:12 am

1 stop14h 57m

$529

Flights are sorted by cheapest round-trip flights first.

Deals found on 2/18

Showing 1-10 of 19 results
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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.
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
No data available for this route at this time. Please check back soon.

Related info for your journey

Find useful and relevant information for your journey from Green Bay to Ontario. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly from for flights from Green Bay to Ontario?

    Located just 5.9 mi from the city center, Green Bay Austin-Straubel (GRB) is the airport most travelers will use when flying to Ontario from Green Bay.

  • How long is the flight from Green Bay to Region of Ontario?

    For as low as $429, American Airlines can have you in Region of Ontario from Green Bay in 6h. Green Bay and Region of Ontario are separated by a distance of 611 mi. Both multi-stop and nonstop flights can be found to your destination and back.

  • What are the most popular routes from Green Bay to Region of Ontario?

    When deciding which route to take from Green Bay to Region of Ontario consider Green Bay Austin-Straubel - Toronto Pearson Intl, Green Bay Austin-Straubel - Ottawa or Green Bay Austin-Straubel - Montreal Pierre Elliott Trudeau Intl as they are the most popular.

  • Can I find deals for flights from Green Bay to Ontario that include hotel bookings?

    Yes. In addition to deals on Green Bay to Ontario flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Green Bay to Ontario?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Green Bay to Ontario.

  • Can I find deals for business class flights from Green Bay to Ontario?

    Yes. Cheapflights offers flight deals from Green Bay to Ontario by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

See more FAQs

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See prices for flight routes from nearby airports that may be better suited for you.
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