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Green Bay

$259+ 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 5/26. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — GRB
May 30 — Jun 61
Sat 5/30
Sat 6/6
1 adult, Economy
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Cheap 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 April 30, 2026.

This United Airlines deal was found by Cheapflights users on 4/29. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/236:39 pm
ONT
-
GRB
2 stops13h 22m
United Airlines
Wed 5/275:26 pm
GRB
-
ONT
1 stop7h 25m
United Airlines
Deal found 4/29$354
This American Airlines deal was found by Cheapflights users on 4/29. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/2311:59 pm
ONT
-
GRB
2 stops9h 46m
American Airlines
Wed 5/2712:15 pm
GRB
-
ONT
2 stops12h 23m
American Airlines
Deal found 4/29$359
This Delta deal was found by Cheapflights users on 4/25. 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 5/2912:07 pm
ONT
-
GRB
1 stop8h 45m
Delta
Fri 6/55:20 am
GRB
-
ONT
1 stop7h 37m
Delta
Deal found 4/25$369
This American Airlines deal was found by Cheapflights users on 4/29. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/248:02 pm
ONT
-
GRB
2 stops11h 02m
American Airlines
Tue 10/69:52 am
GRB
-
ONT
2 stops11h 05m
American Airlines
Deal found 4/29$386
This United Airlines deal was found by Cheapflights users on 4/29. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/306:30 am
ONT
-
GRB
1 stop8h 21m
United Airlines
Sat 6/135:26 pm
GRB
-
ONT
1 stop7h 20m
United Airlines
Deal found 4/29$435
This Delta deal was found by Cheapflights users on 4/29. 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.
Thu 9/2412:00 pm
ONT
-
GRB
1 stop7h 58m
Delta
Tue 10/65:30 am
GRB
-
ONT
1 stop7h 57m
Delta
Deal found 4/29$449

Find 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 April 30, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$354
(United Airlines)

One-way from

$259
(Delta)

Popular in

March

Cheapest in

January

Average price

$476
Provider with most accurate pricing for Ontario-Green Bay Austin-Straubel flight deals.
Search Deals
Provider most trusted by Cheapflights users for Ontario-Green Bay Austin-Straubel flights.
Search Deals
From Ontario to Green Bay Austin-Straubel
Search Deals
One-way flight from Ontario to Green Bay Austin-Straubel
Search Deals
Highest demand for flights based on searches. 6% potential increase in price ($31 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($12 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in April 2026
Search Deals

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 April 30, 2026.
Use the filters below to find and compare flights from Ontario to Green Bay that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

OntarioGreen Bay

ONT - GRB

ONTGRB

Ontario

Thu 9/24

12:00 pm-9:58 pm

1 stop7h 58m

Green Bay Austin-Straubel

Tue 10/6

7:00 am-6:18 pm

2 stops13h 18m

$478

OntarioGreen Bay

ONT - GRB

ONTGRB

Ontario

Wed 5/20

5:00 am-4:50 pm

2 stops9h 50m

Green Bay Austin-Straubel

Tue 5/26

5:26 pm-10:51 pm

1 stop7h 25m

$609

OntarioGreen Bay

ONT - GRB

ONTGRB

Ontario

Tue 7/14

6:00 am-5:11 pm

2 stops9h 11m

Green Bay Austin-Straubel

Fri 7/17

5:10 am-10:38 am

1 stop7h 28m

$612
Quickest round-trip

OntarioGreen Bay

ONT - GRB

ONTGRB

Ontario

Tue 7/14

6:30 am-4:51 pm

1 stop8h 21m

Green Bay Austin-Straubel

Fri 7/17

5:30 pm-10:51 pm

1 stop7h 21m

$634

OntarioGreen Bay

ONT - GRB

ONTGRB

Ontario

Thu 6/18

6:30 am-12:14 am

1 stop15h 44m

Green Bay Austin-Straubel

Mon 6/22

5:26 pm-10:46 pm

1 stop7h 20m

$652

OntarioGreen Bay

ONT - GRB

ONTGRB

Ontario

Tue 7/21

6:30 am-4:51 pm

1 stop8h 21m

Green Bay Austin-Straubel

Wed 7/29

5:30 pm-10:51 pm

1 stop7h 21m

$657

OntarioGreen Bay

ONT - GRB

ONTGRB

Ontario

Fri 5/15

6:59 pm-10:00 am

2 stops13h 01m

Green Bay Austin-Straubel

Sun 5/17

5:35 pm-10:35 pm

1 stop7h 00m

$660

OntarioGreen Bay

ONT - GRB

ONTGRB

Ontario

Mon 6/15

11:59 pm-12:29 pm

2 stops10h 30m

Green Bay Austin-Straubel

Fri 6/19

9:43 am-10:39 pm

2 stops14h 56m

$697

OntarioGreen Bay

ONT - GRB

ONTGRB

Ontario

Thu 6/18

6:30 am-12:14 am

1 stop15h 44m

Green Bay Austin-Straubel

Sun 6/21

5:26 pm-10:46 pm

1 stop7h 20m

$707
Cheapest one-way

OntarioGreen Bay

ONT - GRB

ONTGRB

Ontario

Tue 5/26

10:00 pm-11:13 am

2 stops11h 13m

$259

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/25

Showing 1-10 of 15 resultsSorted by cheapest first
1
2

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 April.
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 Ontario-Green Bay flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Ontario-Green Bay flight deals on Cheapflights vs. FlightHub >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 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 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.

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 April 30, 2026.
Peruse reviews from past customers who have flown with 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.
United Airlines
7.4
Good
9,677 reviews

Crew

8.1

Entertainment

7.1

Comfort

7.3

Food

6.6

Boarding

7.7

Overall

7.4

Reviews

1 / 20
10.0
Excellent

Michelle,Dec 2025

DEN - MKE

I liked that the plane waited 5 minutes for a family whose incoming plane was late. This was the last flight of the day to MKE. Flight attendants actually checked in throughout the flight. Although, not really friendly. Happy to see screens on seat backs again. This is my first time not flying first class in over 10 years. It was economy plus.
United Airlines
7.4
Good
9,677 reviews
United Airlines
7.4
Good
9,677 reviews

Crew

8.1

Entertainment

7.1

Comfort

7.3

Food

6.6

Boarding

7.7

Overall

7.4

Reviews

1 / 20
10.0
Excellent

Michelle,Dec 2025

DEN - MKE

I liked that the plane waited 5 minutes for a family whose incoming plane was late. This was the last flight of the day to MKE. Flight attendants actually checked in throughout the flight. Although, not really friendly. Happy to see screens on seat backs again. This is my first time not flying first class in over 10 years. It was economy plus.
American Airlines
7.1
Good
11,681 reviews
United Airlines
7.4
Good
9,677 reviews

Crew

8.1

Entertainment

7.1

Comfort

7.3

Food

6.6

Boarding

7.7

Overall

7.4

Reviews

1 / 20
10.0
Excellent

Michelle,Dec 2025

DEN - MKE

I liked that the plane waited 5 minutes for a family whose incoming plane was late. This was the last flight of the day to MKE. Flight attendants actually checked in throughout the flight. Although, not really friendly. Happy to see screens on seat backs again. This is my first time not flying first class in over 10 years. It was economy plus.

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 6h 39m. 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?

    American Airlines, at $299, was found to be the cheapest airline from Ontario to Green Bay. An alternate airline flying to your destination would be United 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.

See more FAQs

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Alternative routes for Ontario to Green Bay

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Top 2 airlines flying from Ontario to Green Bay

Discover the top 2 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 April 30, 2026.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest$299Average$867FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$325Average$526FlexibilityNo cancel feeOn-time69%

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