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$274+ 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 12/31. Fares are subject to change and may not be available on all flights or dates of travel.
GRB — ONT
Dec 5 — Dec 121
Fri 12/5
Fri 12/12
1 adult, Economy
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Find 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 November 5, 2025.

This American Airlines deal was found by Cheapflights users on 11/4. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/1911:06 amGRB - ONT
2 stops10h 35mAmerican Airlines
Sun 11/2311:59 pmONT - GRB
2 stops10h 55mAmerican Airlines
Deal found 11/4$369
This American Airlines deal was found by Cheapflights users on 11/3. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/136:00 amGRB - ONT
2 stops12h 02mAmerican Airlines
Sat 12/207:18 pmONT - GRB
2 stops12h 21mAmerican Airlines
Deal found 11/3$397
This United Airlines deal was found by Cheapflights users on 11/4. 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 11/195:27 pmGRB - ONT
1 stop7h 04mUnited Airlines
Sun 11/237:00 amONT - GRB
1 stop7h 46mUnited Airlines
Deal found 11/4$442
This United Airlines deal was found by Cheapflights users on 11/3. 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.
Sun 12/141:35 pmGRB - ONT
2 stops11h 14mUnited Airlines
Sun 12/2111:59 pmONT - GRB
1 stop8h 10mUnited Airlines
Deal found 11/3$495
This United Airlines deal was found by Cheapflights users on 11/5. 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 12/121:35 pmGRB - ONT
2 stops11h 14mUnited Airlines
Sun 12/146:41 pmONT - GRB
2 stops13h 26mUnited Airlines
Deal found 11/5$515
This United Airlines deal was found by Cheapflights users on 11/3. 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.
Sat 12/131:35 pmGRB - ONT
2 stops11h 14mUnited Airlines
Sat 12/206:04 amONT - GRB
2 stops10h 58mUnited Airlines
Deal found 11/3$523
This United Airlines deal was found by Cheapflights users on 11/4. 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 11/73:51 pmGRB - ONT
1 stop8h 40mUnited Airlines
Sun 11/167:00 amONT - GRB
1 stop6h 10mUnited Airlines
Deal found 11/4$574
This Delta deal was found by Cheapflights users on 11/5. 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 12/195:15 amGRB - ONT
1 stop7h 47mDelta
Sun 12/2111:10 amONT - GRB
1 stop9h 37mDelta
Deal found 11/5$577
This American Airlines deal was found by Cheapflights users on 11/5. 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 12/1910:09 amGRB - ONT
2 stops10h 59mAmerican Airlines
Sun 12/217:18 pmONT - GRB
2 stops12h 21mAmerican Airlines
Deal found 11/5$604

Cheap 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 November 5, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$369
(American Airlines)

One-way from

$274
(United Airlines)

Popular in

March

Cheapest in

May

Average price

$403
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.
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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. 33% potential increase in price ($222 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 10% potential price decrease ($42 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in November 2025
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 November 5, 2025.
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 BayOntario

GRB - ONT

GRBONT

Green Bay Austin-Straubel

Wed 11/19

11:06 am-7:41 pm

2 stops10h 35m

Ontario

Sun 11/23

11:59 pm-12:54 pm

2 stops10h 55m

$369

Green BayOntario

GRB - ONT

GRBONT

Green Bay Austin-Straubel

Sat 12/13

6:00 am-4:02 pm

2 stops12h 02m

Ontario

Sat 12/20

7:18 pm-9:39 am

2 stops12h 21m

$397

Green BayOntario

GRB - ONT

GRBONT

Green Bay Austin-Straubel

Wed 11/19

5:27 pm-10:31 pm

1 stop7h 04m

Ontario

Sun 11/23

7:00 am-4:46 pm

1 stop7h 46m

$442

Green BayOntario

GRB - ONT

GRBONT

Green Bay Austin-Straubel

Sun 12/14

1:35 pm-10:49 pm

2 stops11h 14m

Ontario

Sun 12/21

11:59 pm-10:09 am

1 stop8h 10m

$495

Green BayOntario

GRB - ONT

GRBONT

Green Bay Austin-Straubel

Fri 12/12

1:35 pm-10:49 pm

2 stops11h 14m

Ontario

Sun 12/14

6:41 pm-10:07 am

2 stops13h 26m

$515

Green BayOntario

GRB - ONT

GRBONT

Green Bay Austin-Straubel

Sat 12/13

1:35 pm-10:49 pm

2 stops11h 14m

Ontario

Sat 12/20

6:04 am-7:02 pm

2 stops10h 58m

$523

Green BayOntario

GRB - ONT

GRBONT

Green Bay Austin-Straubel

Fri 12/19

5:15 am-11:02 am

1 stop7h 47m

Ontario

Sun 12/21

11:10 am-10:47 pm

1 stop9h 37m

$577

Green BayOntario

GRB - ONT

GRBONT

Green Bay Austin-Straubel

Fri 12/19

10:09 am-7:08 pm

2 stops10h 59m

Ontario

Sun 12/21

7:18 pm-9:39 am

2 stops12h 21m

$604

Green BayOntario

GRB - ONT

GRBONT

Green Bay Austin-Straubel

Wed 12/31

3:42 pm-10:25 pm

1 stop8h 43m

$274

Green BayOntario

GRB - ONT

GRBONT

Green Bay Austin-Straubel

Thu 3/12

5:30 am-11:38 am

1 stop8h 08m

$279

Flights are sorted by cheapest round-trip flights first.

Deals found on 11/5

Showing 1-10 of 19 results
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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 November.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy2 starsTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*1 star
eDreamsPrice 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 eDreams to be most consistent on Cheapflights vs. eDreams Users can find the same prices on Green Bay-Ontario flight deals on Cheapflights vs. eDreams >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 eDreams the most. eDreams 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 $288). 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 $442, American Airlines can have you in Ontario from Green Bay in 7h 04m. There are 1720 mi between Green Bay and Ontario. This flight may include one or multiple stops.

  • What are the cheapest airlines to fly from Green Bay to Ontario one-way?

    One-way options have recently been found by users for as low as $274 on United Airlines. Other airlines that offer cheap prices include Delta from $279 and American Airlines from $314 one-way.

  • 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 $288). 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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