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Green Bay

$279+ Cheap flights from Ontario to Green Bay (ONT - GRB)

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 11/24. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — GRB
Nov 30 — Dec 71
Sun 11/30
Sun 12/7
1 adult, Economy
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Cheap flight deals from Ontario to Green Bay

Discover tips and strategies to find the most affordable flight options for your journey from Ontario (ONT) to Green Bay (GRB). 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 October 31, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$363
(Delta)

One-way from

$279
(United Airlines)

Popular in

December

Cheapest in

November

Average price

$429
Provider with most accurate pricing for Ontario-Green Bay Austin-Straubel flight deals.
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Provider most trusted by Cheapflights users for Ontario-Green Bay Austin-Straubel flights.
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From Ontario to Green Bay Austin-Straubel
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One-way flight from Ontario to Green Bay Austin-Straubel
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High demand for flights, 0% potential price rise
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Cheapest flight prices on average. 7% potential price decrease ($34 potential savings vs. average RT price).
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Average for round-trip flights in October 2025
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Find flight deals from Ontario to Green Bay

Cheapest flights from Ontario to Green Bay
Explore the most affordable flight options available from Ontario to Green Bay. Find the lowest fares from popular airlines and budget airlines, with prices last updated on October 31, 2025.

This Delta deal was found by Cheapflights users on 10/30. 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 11/1512:16 pmONT - GRB
1 stop8h 17mDelta
Wed 11/194:17 pmGRB - ONT
2 stops9h 35mDelta
Deal found 10/30$364
This United Airlines deal was found by Cheapflights users on 10/30. 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 12/2311:59 pmONT - GRB
1 stop8h 10mUnited Airlines
Wed 12/313:42 pmGRB - ONT
1 stop8h 43mUnited Airlines
Deal found 10/30$379
This United Airlines deal was found by Cheapflights users on 10/30. 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 11/157:00 amONT - GRB
1 stop7h 46mUnited Airlines
Wed 11/193:51 pmGRB - ONT
1 stop8h 40mUnited Airlines
Deal found 10/30$402
This Delta deal was found by Cheapflights users on 10/31. 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 12/510:25 pmONT - GRB
2 stops11h 08mDelta
Fri 12/125:15 amGRB - ONT
1 stop7h 47mDelta
Deal found 10/31$409
This Delta deal was found by Cheapflights users on 10/29. 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 10/3111:36 amONT - GRB
1 stop9h 16mDelta
Sun 11/212:02 pmGRB - ONT
2 stops11h 18mDelta
Deal found 10/29$443
This United Airlines deal was found by Cheapflights users on 10/30. 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 12/1911:59 pmONT - GRB
1 stop8h 10mUnited Airlines
Sat 1/35:22 pmGRB - ONT
1 stop7h 03mUnited Airlines
Deal found 10/30$460

Cheapflights Fare Finder

 
Customize your flight search to find flights from Ontario to Green Bay 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 October 31, 2025.
Use the filters below to find and compare flights from Ontario to Green Bay that are best for you.

Fly from

Ontario

Fly to

Green Bay

Route

Depart

Return

Price

OntarioGreen Bay

ONT - GRB

ONTGRB

Ontario

Sat 11/15

12:16 pm-10:33 pm

1 stop8h 17m

Green Bay Austin-Straubel

Wed 11/19

4:17 pm-11:52 pm

2 stops9h 35m

$364

OntarioGreen Bay

ONT - GRB

ONTGRB

Ontario

Tue 12/23

11:59 pm-10:09 am

1 stop8h 10m

Green Bay Austin-Straubel

Mon 1/5

5:22 pm-10:25 pm

1 stop7h 03m

$379

OntarioGreen Bay

ONT - GRB

ONTGRB

Ontario

Fri 12/19

11:59 pm-10:09 am

1 stop8h 10m

Green Bay Austin-Straubel

Mon 1/5

5:22 pm-10:25 pm

1 stop7h 03m

$379

OntarioGreen Bay

ONT - GRB

ONTGRB

Ontario

Sat 11/15

7:00 am-4:46 pm

1 stop7h 46m

Green Bay Austin-Straubel

Wed 11/19

3:51 pm-10:31 pm

1 stop8h 40m

$402

OntarioGreen Bay

ONT - GRB

ONTGRB

Ontario

Tue 4/14

12:00 pm-9:58 pm

1 stop7h 58m

Green Bay Austin-Straubel

Sat 4/18

4:00 pm-11:44 pm

2 stops9h 44m

$404

OntarioGreen Bay

ONT - GRB

ONTGRB

Ontario

Fri 12/5

10:25 pm-11:33 am

2 stops11h 08m

Green Bay Austin-Straubel

Fri 12/12

12:13 pm-10:47 pm

2 stops12h 34m

$414

OntarioGreen Bay

ONT - GRB

ONTGRB

Ontario

Mon 11/24

5:05 am-7:00 pm

2 stops11h 55m

$279

OntarioGreen Bay

ONT - GRB

ONTGRB

Ontario

Sat 11/8

5:05 am-7:01 pm

2 stops11h 56m

$428

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/30

Compare providers for flights from Ontario to Green Bay

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 Ontario to Green Bay in October.
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 Ontario-Green Bay flights, users find the pricing of eDreams to be most consistent on Cheapflights vs. eDreams Users can find the same prices on Ontario-Green Bay flight deals on Cheapflights vs. eDreams >95% of the time. Price accuracy is based on data collected from Ontario-Green Bay flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Ontario-Green Bay 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 Ontario-Green Bay 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 Ontario to Green Bay

Have a flexible travel schedule? Discover the best time to fly to Green Bay from Ontario 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 Ontario to Green Bay

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

Currently, July is the cheapest month in which you can book a flight from Ontario to Green Bay (average of $105). Flying from Ontario to Green Bay in April 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.

What is the cheapest time of day to fly from ONT to GRB?

Find hourly flight availability from Ontario to Green Bay. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated October 31, 2025.

One of the essential ways to save on airfare from Ontario to Green Bay is to remain as flexible as possible. Flights that are in the morning tend to be the most expensive. A flight at noon could potentially save you up to 16% on airfare.

Reviews of airlines servicing Green Bay

Get insights into the airlines that provide service to Green Bay. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Green Bay. Reviews last updated October 31, 2025.
Peruse reviews from past customers who have flown with Delta, United Airlines, and American Airlines from Ontario to Green Bay to help guide your decision. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Delta
7.9
Good
7,996 reviews

Comfort

7.9

Overall

7.9

Entertainment

7.9

Food

7.3

Crew

8.5

Boarding

8.2

Reviews

1 / 20
10.0
Excellent

Michael,Sep 2023

SMF - ATL

Not sufficient leg room and three seats are very tigh.t on 737 in economy main cabin
Delta
7.9
Good
7,996 reviews
Delta
7.9
Good
7,996 reviews

Comfort

7.9

Overall

7.9

Entertainment

7.9

Food

7.3

Crew

8.5

Boarding

8.2

Reviews

1 / 20
10.0
Excellent

Michael,Sep 2023

SMF - ATL

Not sufficient leg room and three seats are very tigh.t on 737 in economy main cabin
United Airlines
7.4
Good
8,995 reviews
Delta
7.9
Good
7,996 reviews

Comfort

7.9

Overall

7.9

Entertainment

7.9

Food

7.3

Crew

8.5

Boarding

8.2

Reviews

1 / 20
10.0
Excellent

Michael,Sep 2023

SMF - ATL

Not sufficient leg room and three seats are very tigh.t on 737 in economy main cabin
American Airlines
7.2
Good
11,031 reviews
Delta
7.9
Good
7,996 reviews

Comfort

7.9

Overall

7.9

Entertainment

7.9

Food

7.3

Crew

8.5

Boarding

8.2

Reviews

1 / 20
10.0
Excellent

Michael,Sep 2023

SMF - ATL

Not sufficient leg room and three seats are very tigh.t on 737 in economy main cabin

Related info for your journey

Find useful and relevant information for your journey from Ontario to Green Bay. 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 Ontario to Green Bay?

    There are many flights that can get you from Ontario to Green Bay in 8h 10m. Fly via Delta or United Airlines to get the fastest option. There are 1720 mi between Ontario and Green Bay. This flight may include one or multiple stops.

  • What are the cheapest airlines flying from Ontario to Green Bay round-trip?

    United Airlines, at $298, was found to be the cheapest airline from Ontario to Green Bay.Alternate airlines to your destination round-trip include American Airlines and Delta. You may be able to fly from Ontario to Green Bay for 39% less than the average price by searching for these airlines.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from Ontario to Green Bay 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 Ontario to Green Bay?

    Currently, July is the cheapest month in which you can book a flight from Ontario to Green Bay (average of $105). Flying from Ontario to Green Bay in April 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

Traveling to a place near Green Bay?

Book flights to Green Bay if you plan to visit one of these locations
Manitowoc

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Alternative routes for Ontario to Green Bay

See prices for flight routes from nearby airports that may be better suited for you.
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Top 3 airlines flying from Ontario to Green Bay

Discover the top 3 airlines that operate flights from Ontario to Green Bay. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated October 31, 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$298Average$608FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$299Average$867FlexibilityNo cancel feeOn-time71%
DeltaCheapest$371Average$464FlexibilityNo cancel feeOn-timeN/A

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