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$281+ 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 11/27. Fares are subject to change and may not be available on all flights or dates of travel.
GRB — ONT
Oct 15 — Oct 221
Wed 10/15
Wed 10/22
1 adult, Economy
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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 September 15, 2025.

Round-trip from

$339
(Delta)

One-way from

$281
(United Airlines)

Popular in

March

Cheapest in

May

Average price

$338
From Green Bay Austin-Straubel to Ontario
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One-way flight from Green Bay Austin-Straubel to Ontario
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Highest demand for flights based on searches. 32% potential increase in price ($217 potential increase over avg. RT price).
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Cheapest flight prices on average. 10% potential price decrease ($41 potential savings vs. average RT price).
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Average for round-trip flights in September 2025
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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 September 15, 2025.

This Delta deal was found by Cheapflights users on 9/13. 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 9/275:34 amGRB - ONT
1 stop7h 08mDelta
Wed 10/111:55 amONT - GRB
1 stop9h 05mDelta
Deal found 9/13$339
This Delta deal was found by Cheapflights users on 9/13. 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.
Sun 9/215:34 amGRB - ONT
1 stop7h 08mDelta
Sat 9/2711:55 amONT - GRB
1 stop9h 05mDelta
Deal found 9/13$379
This United Airlines deal was found by Cheapflights users on 9/15. 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 9/15$404
This American Airlines deal was found by Cheapflights users on 9/15. 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 9/246:00 amGRB - ONT
2 stops9h 54mAmerican Airlines
Sun 9/287:16 pmONT - GRB
2 stops12h 02mAmerican Airlines
Deal found 9/15$429
This United Airlines deal was found by Cheapflights users on 9/13. 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 9/271:20 pmGRB - ONT
1 stop6h 46mUnited Airlines
Wed 10/16:00 amONT - GRB
2 stops12h 58mUnited Airlines
Deal found 9/13$434
This Delta deal was found by Cheapflights users on 9/15. 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 9/245:34 amGRB - ONT
1 stop7h 08mDelta
Sun 9/2811:55 amONT - GRB
1 stop9h 05mDelta
Deal found 9/15$449
This United Airlines deal was found by Cheapflights users on 9/15. 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 9/243:45 pmGRB - ONT
1 stop8h 45mUnited Airlines
Sun 9/286:36 pmONT - GRB
2 stops13h 29mUnited Airlines
Deal found 9/15$450
This United Airlines deal was found by Cheapflights users on 9/14. 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 11/223:51 pmGRB - ONT
1 stop8h 40mUnited Airlines
Fri 11/287:00 amONT - GRB
1 stop6h 10mUnited Airlines
Deal found 9/14$460
This Delta deal was found by Cheapflights users on 9/13. 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.
Sun 9/215:34 amGRB - ONT
1 stop7h 08mDelta
Sun 9/2811:55 amONT - GRB
1 stop9h 05mDelta
Deal found 9/13$469
This United Airlines deal was found by Cheapflights users on 9/13. 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 9/215:30 pmGRB - ONT
1 stop7h 00mUnited Airlines
Sat 9/275:05 amONT - GRB
2 stops9h 44mUnited Airlines
Deal found 9/13$474

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 September 15, 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

Sat 9/27

5:34 am-10:42 am

1 stop7h 08m

Ontario

Wed 10/1

11:55 am-11:00 pm

1 stop9h 05m

$339

Green BayOntario

GRB - ONT

GRBONT

Green Bay Austin-Straubel

Fri 11/7

3:51 pm-10:31 pm

1 stop8h 40m

Ontario

Sun 11/16

7:00 am-3:10 pm

1 stop6h 10m

$404

Green BayOntario

GRB - ONT

GRBONT

Green Bay Austin-Straubel

Tue 9/30

2:40 pm-10:30 pm

1 stop9h 50m

Ontario

Sat 10/4

7:02 am-3:09 pm

1 stop6h 07m

$429

Green BayOntario

GRB - ONT

GRBONT

Green Bay Austin-Straubel

Sat 9/27

1:20 pm-6:06 pm

1 stop6h 46m

Ontario

Wed 10/1

6:00 am-8:58 pm

2 stops12h 58m

$434

Green BayOntario

GRB - ONT

GRBONT

Green Bay Austin-Straubel

Sun 11/23

3:51 pm-10:31 pm

1 stop8h 40m

Ontario

Fri 11/28

7:00 am-3:10 pm

1 stop6h 10m

$460

Green BayOntario

GRB - ONT

GRBONT

Green Bay Austin-Straubel

Sat 11/22

3:51 pm-10:31 pm

1 stop8h 40m

Ontario

Fri 11/28

7:00 am-3:10 pm

1 stop6h 10m

$460

Green BayOntario

GRB - ONT

GRBONT

Green Bay Austin-Straubel

Mon 11/24

5:22 pm-10:31 pm

1 stop7h 09m

Ontario

Fri 11/28

7:00 am-3:10 pm

1 stop6h 10m

$460

Green BayOntario

GRB - ONT

GRBONT

Green Bay Austin-Straubel

Thu 11/27

8:00 am-3:21 pm

1 stop9h 21m

$281

Green BayOntario

GRB - ONT

GRBONT

Green Bay Austin-Straubel

Mon 12/8

5:21 pm-12:32 pm

2 stops45h 11m

$519

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/13

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, August is the cheapest month in which you can book a flight from Green Bay to Ontario (average of $246). Flying from Green Bay to Ontario in March is currently the most expensive (average of $328). 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 $339, Delta can have you in Ontario from Green Bay in 7h 08m. There are 1720 mi between Green Bay and Ontario. This flight may include one or multiple stops.

  • 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, August is the cheapest month in which you can book a flight from Green Bay to Ontario (average of $246). Flying from Green Bay to Ontario in March is currently the most expensive (average of $328). 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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Alternative routes for Green Bay to Ontario

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