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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 3/4. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — GRB
Feb 28 — Mar 71
Sat 2/28
Sat 3/7
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 January 29, 2026.

This United Airlines deal was found by Cheapflights users on 1/28. 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.
Thu 3/2611:59 pm
ONT
-
GRB
1 stop8h 00m
United Airlines
Mon 4/63:00 pm
GRB
-
ONT
1 stop9h 26m
United Airlines
Deal found 1/28$309
This Delta deal was found by Cheapflights users on 1/27. 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 5/1912:00 pm
ONT
-
GRB
1 stop7h 58m
Delta
Fri 5/294:00 pm
GRB
-
ONT
2 stops9h 44m
Delta
Deal found 1/27$318
This Delta deal was found by Cheapflights users on 1/27. 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 4/2510:15 pm
ONT
-
GRB
2 stops10h 14m
Delta
Sat 5/1610:50 am
GRB
-
ONT
2 stops9h 25m
Delta
Deal found 1/27$328
This Delta deal was found by Cheapflights users on 1/27. 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 5/1912:00 pm
ONT
-
GRB
1 stop7h 58m
Delta
Thu 5/285:30 am
GRB
-
ONT
1 stop7h 50m
Delta
Deal found 1/27$333
This Delta deal was found by Cheapflights users on 1/27. 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 5/1912:00 pm
ONT
-
GRB
1 stop7h 58m
Delta
Mon 5/255:30 am
GRB
-
ONT
1 stop7h 50m
Delta
Deal found 1/27$358
This United Airlines deal was found by Cheapflights users on 1/27. 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.
Thu 3/511:59 pm
ONT
-
GRB
1 stop8h 00m
United Airlines
Mon 3/92:54 pm
GRB
-
ONT
1 stop9h 24m
United Airlines
Deal found 1/27$399
This Delta deal was found by Cheapflights users on 1/27. 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 5/1912:00 pm
ONT
-
GRB
1 stop7h 58m
Delta
Wed 5/275:30 am
GRB
-
ONT
1 stop7h 50m
Delta
Deal found 1/27$402
This United Airlines deal was found by Cheapflights users on 1/27. 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 3/66:37 pm
ONT
-
GRB
2 stops13h 22m
United Airlines
Mon 3/163:43 pm
GRB
-
ONT
1 stop8h 35m
United Airlines
Deal found 1/27$404

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 January 29, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$309
(United Airlines)

One-way from

$279
(United Airlines)

Popular in

December

Cheapest in

January

Average price

$305
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
High demand for flights, 3% potential price rise
Search Deals
Cheapest flight prices on average. 1% potential price decrease ($9 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in January 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 January 29, 2026.
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

Tue 5/19

12:00 pm-9:58 pm

1 stop7h 58m

Green Bay Austin-Straubel

Fri 5/29

4:00 pm-11:44 pm

2 stops9h 44m

$318

OntarioGreen Bay

ONT - GRB

ONTGRB

Ontario

Sat 4/25

10:15 pm-10:29 am

2 stops10h 14m

Green Bay Austin-Straubel

Sat 5/16

10:50 am-6:15 pm

2 stops9h 25m

$328

OntarioGreen Bay

ONT - GRB

ONTGRB

Ontario

Tue 5/19

12:00 pm-9:58 pm

1 stop7h 58m

Green Bay Austin-Straubel

Thu 5/28

5:30 am-11:20 am

1 stop7h 50m

$333

OntarioGreen Bay

ONT - GRB

ONTGRB

Ontario

Tue 5/19

12:00 pm-9:58 pm

1 stop7h 58m

Green Bay Austin-Straubel

Mon 5/25

5:30 am-11:20 am

1 stop7h 50m

$358

OntarioGreen Bay

ONT - GRB

ONTGRB

Ontario

Tue 5/19

12:00 pm-9:58 pm

1 stop7h 58m

Green Bay Austin-Straubel

Wed 5/27

10:50 am-10:09 pm

2 stops13h 19m

$363

OntarioGreen Bay

ONT - GRB

ONTGRB

Ontario

Wed 5/20

12:00 pm-9:58 pm

1 stop7h 58m

Green Bay Austin-Straubel

Mon 5/25

4:00 pm-11:44 pm

2 stops9h 44m

$363

OntarioGreen Bay

ONT - GRB

ONTGRB

Ontario

Sat 4/25

7:00 am-3:12 pm

1 stop6h 12m

Green Bay Austin-Straubel

Sat 5/16

10:37 am-6:01 pm

1 stop9h 24m

$399

OntarioGreen Bay

ONT - GRB

ONTGRB

Ontario

Fri 3/6

11:59 pm-9:59 am

1 stop8h 00m

Green Bay Austin-Straubel

Tue 3/17

5:28 pm-10:18 pm

1 stop6h 50m

$399

OntarioGreen Bay

ONT - GRB

ONTGRB

Ontario

Wed 3/25

11:59 pm-9:59 am

1 stop8h 00m

Green Bay Austin-Straubel

Mon 3/30

5:35 pm-10:26 pm

1 stop6h 51m

$399

OntarioGreen Bay

ONT - GRB

ONTGRB

Ontario

Thu 3/26

11:59 pm-9:59 am

1 stop8h 00m

Green Bay Austin-Straubel

Mon 3/30

5:35 pm-10:26 pm

1 stop6h 51m

$399

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/27

Showing 1-10 of 14 results
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 January.
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.

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 February is currently the most expensive (average of $282). 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.

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 January 29, 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
9,215 reviews

Boarding

7.7

Comfort

7.3

Crew

8.1

Entertainment

7.1

Overall

7.4

Food

6.6

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
9,215 reviews
United Airlines
7.4
Good
9,215 reviews

Boarding

7.7

Comfort

7.3

Crew

8.1

Entertainment

7.1

Overall

7.4

Food

6.6

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
7.2
Good
11,205 reviews
United Airlines
7.4
Good
9,215 reviews

Boarding

7.7

Comfort

7.3

Crew

8.1

Entertainment

7.1

Overall

7.4

Food

6.6

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 7h 58m. Fly via Delta to get the fastest option. There are 1720 mi between Ontario and Green Bay.

  • 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.

  • 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 February is currently the most expensive (average of $282). 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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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 January 29, 2026.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest$299Average$867FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$325Average$577FlexibilityNo cancel feeOn-time69%

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