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Ontario

$227+ Cheap flights from Green Bay to Ontario (GRB - ONT)

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 4/13. Fares are subject to change and may not be available on all flights or dates of travel.
GRB — ONT
Apr 19 — Apr 261
Sun 4/19
Sun 4/26
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 March 20, 2026.

This United Airlines deal was found by Cheapflights users on 3/17. 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.
Fri 5/13:48 pm
GRB
-
ONT
1 stop8h 47m
United Airlines
Mon 5/46:59 pm
ONT
-
GRB
2 stops13h 01m
United Airlines
Deal found 3/17$374
This Delta deal was found by Cheapflights users on 3/17. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/17:00 am
GRB
-
ONT
2 stops11h 25m
Delta
Mon 5/410:15 pm
ONT
-
GRB
2 stops10h 14m
Delta
Deal found 3/17$379
This Delta deal was found by Cheapflights users on 3/17. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/44:00 pm
GRB
-
ONT
2 stops9h 44m
Delta
Tue 8/1112:00 pm
ONT
-
GRB
1 stop7h 58m
Delta
Deal found 3/17$393
This Delta deal was found by Cheapflights users on 3/20. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/206:20 am
GRB
-
ONT
2 stops7h 59m
Delta
Tue 5/269:50 am
ONT
-
GRB
2 stops10h 08m
Delta
Deal found 3/20$398
This Delta deal was found by Cheapflights users on 3/20. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/206:20 am
GRB
-
ONT
2 stops7h 59m
Delta
Wed 5/2712:07 pm
ONT
-
GRB
1 stop8h 45m
Delta
Deal found 3/20$423
This Delta deal was found by Cheapflights users on 3/20. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/214:19 pm
GRB
-
ONT
2 stops9h 15m
Delta
Tue 5/269:50 am
ONT
-
GRB
2 stops10h 08m
Delta
Deal found 3/20$429
This United Airlines deal was found by Cheapflights users on 3/17. 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 4/283:47 pm
GRB
-
ONT
1 stop8h 44m
United Airlines
Sat 5/27:00 am
ONT
-
GRB
1 stop7h 50m
United Airlines
Deal found 3/17$447
This Delta deal was found by Cheapflights users on 3/20. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/214:19 pm
GRB
-
ONT
2 stops9h 15m
Delta
Wed 5/2712:07 pm
ONT
-
GRB
1 stop8h 45m
Delta
Deal found 3/20$454

Find flight deals from Green Bay to Ontario

Discover tips and strategies to find the most affordable flight options for your journey from Green Bay (GRB) to Ontario (ONT). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated March 20, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$374
(United Airlines)

One-way from

$227
(United Airlines)

Popular in

April

Cheapest in

May

Average price

$479
Provider with most accurate pricing for Green Bay Austin-Straubel-Ontario flight deals.
Search Deals
Provider most trusted by Cheapflights users for Green Bay Austin-Straubel-Ontario flights.
Search Deals
From Green Bay Austin-Straubel to Ontario
Search Deals
One-way flight from Green Bay Austin-Straubel to Ontario
Search Deals
Highest demand for flights based on searches. 10% potential increase in price ($45 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease ($17 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in March 2026
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 March 20, 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

Price

Cheapest round-trip

Green BayOntario

GRB - ONT

GRBONT

Green Bay Austin-Straubel

Tue 4/28

3:47 pm-10:31 pm

1 stop8h 44m

Ontario

Sat 5/2

7:00 am-4:50 pm

1 stop7h 50m

$447
Quickest round-trip

Green BayOntario

GRB - ONT

GRBONT

Green Bay Austin-Straubel

Thu 5/21

3:44 pm-10:46 pm

1 stop9h 02m

Ontario

Thu 5/28

6:30 am-3:09 pm

1 stop6h 39m

$469

Green BayOntario

GRB - ONT

GRBONT

Green Bay Austin-Straubel

Fri 7/3

5:30 am-11:20 am

1 stop7h 50m

Ontario

Tue 7/7

12:00 pm-9:58 pm

1 stop7h 58m

$483

Green BayOntario

GRB - ONT

GRBONT

Green Bay Austin-Straubel

Sat 6/13

5:26 pm-10:46 pm

1 stop7h 20m

Ontario

Sat 6/20

6:30 am-4:51 pm

1 stop8h 21m

$490

Green BayOntario

GRB - ONT

GRBONT

Green Bay Austin-Straubel

Fri 5/1

3:48 pm-10:35 pm

1 stop8h 47m

Ontario

Mon 5/4

7:00 am-4:50 pm

1 stop7h 50m

$504

Green BayOntario

GRB - ONT

GRBONT

Green Bay Austin-Straubel

Mon 6/29

3:44 pm-10:51 pm

1 stop9h 07m

Ontario

Thu 7/9

6:30 am-4:51 pm

1 stop8h 21m

$514
Cheapest one-way

Green BayOntario

GRB - ONT

GRBONT

Green Bay Austin-Straubel

Wed 5/6

1:15 pm-10:59 pm

2 stops11h 44m

$269

Green BayOntario

GRB - ONT

GRBONT

Green Bay Austin-Straubel

Tue 8/4

4:00 pm-11:44 pm

2 stops9h 44m

$304

Green BayOntario

GRB - ONT

GRBONT

Green Bay Austin-Straubel

Fri 7/17

12:12 pm-9:44 pm

2 stops11h 32m

$334

Green BayOntario

GRB - ONT

GRBONT

Green Bay Austin-Straubel

Wed 4/1

5:19 am-11:47 am

1 stop8h 28m

$372

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/18

Showing 1-10 of 14 resultsSorted by cheapest first
1
2

Compare providers for flights from Green Bay to Ontario

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Green Bay to Ontario in March.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on Green Bay-Ontario flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Green Bay-Ontario flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Green Bay-Ontario flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Green Bay-Ontario flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Green Bay-Ontario flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

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

What is the cheapest month to book a flight from Green Bay to Ontario?

Currently, July is the cheapest month in which you can book a flight from Green Bay to Ontario (average of $60). Flying from Green Bay to Ontario in March is currently the most expensive (average of $284). 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.

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.

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

    For as low as $447, United Airlines can have you in Ontario from Green Bay in 8h 44m. There are 1720 mi between Green Bay and Ontario.

  • 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.

  • What is the cheapest month to book a flight from Green Bay to Ontario?

    Currently, July is the cheapest month in which you can book a flight from Green Bay to Ontario (average of $60). Flying from Green Bay to Ontario in March is currently the most expensive (average of $284). 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.

See more FAQs

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