HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Green Bay

$219+ 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 4/25. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — GRB
Apr 17 — Apr 241
Fri 4/17
Fri 4/24
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Ontario to Green Bay with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

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 March 18, 2026.

This American Airlines deal was found by Cheapflights users on 3/16. 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 4/2510:54 am
ONT
-
GRB
2 stops9h 04m
American Airlines
Sat 5/169:42 am
GRB
-
ONT
2 stops11h 52m
American Airlines
Deal found 3/16$359
This Delta deal was found by Cheapflights users on 3/17. 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 4/3012:49 pm
ONT
-
GRB
1 stop8h 12m
Delta
Sat 5/911:11 am
GRB
-
ONT
2 stops12h 37m
Delta
Deal found 3/17$368
This American Airlines deal was found by Cheapflights users on 3/17. 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 3/17$373
This Delta deal was found by Cheapflights users on 3/17. 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 4/2512:49 pm
ONT
-
GRB
1 stop8h 12m
Delta
Sat 5/166:20 am
GRB
-
ONT
2 stops7h 59m
Delta
Deal found 3/17$393
This Delta deal was found by Cheapflights users on 3/13. 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.
Wed 9/212:00 pm
ONT
-
GRB
1 stop7h 58m
Delta
Sun 9/65:30 am
GRB
-
ONT
2 stops12h 44m
Delta
Deal found 3/13$398
This United Airlines deal was found by Cheapflights users on 3/17. 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 4/16:49 pm
ONT
-
GRB
2 stops13h 11m
United Airlines
Sun 4/52:48 pm
GRB
-
ONT
1 stop9h 43m
United Airlines
Deal found 3/17$424
This Delta deal was found by Cheapflights users on 3/13. 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.
Thu 9/312:00 pm
ONT
-
GRB
1 stop7h 58m
Delta
Sun 9/65:30 am
GRB
-
ONT
1 stop7h 34m
Delta
Deal found 3/13$434
This United Airlines deal was found by Cheapflights users on 3/18. 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 5/276:30 am
ONT
-
GRB
1 stop6h 39m
United Airlines
Wed 6/103:44 pm
GRB
-
ONT
1 stop9h 02m
United Airlines
Deal found 3/18$447

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 March 18, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$359
(American Airlines)

One-way from

$219
(Delta)

Popular in

April

Cheapest in

January

Average price

$602
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. 17% potential increase in price ($102 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($14 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in March 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 March 18, 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

Sat 4/25

10:54 am-9:58 pm

2 stops9h 04m

Green Bay Austin-Straubel

Sat 5/16

9:42 am-7:34 pm

2 stops11h 52m

$359

OntarioGreen Bay

ONT - GRB

ONTGRB

Ontario

Sat 4/25

12:49 pm-11:01 pm

1 stop8h 12m

Green Bay Austin-Straubel

Sat 5/16

11:11 am-10:45 pm

2 stops13h 34m

$422

OntarioGreen Bay

ONT - GRB

ONTGRB

Ontario

Thu 4/30

12:49 pm-11:01 pm

1 stop8h 12m

Green Bay Austin-Straubel

Sat 5/9

11:06 am-9:48 pm

2 stops12h 42m

$423

OntarioGreen Bay

ONT - GRB

ONTGRB

Ontario

Wed 4/1

6:49 pm-10:00 am

2 stops13h 11m

Green Bay Austin-Straubel

Sun 4/5

2:48 pm-10:31 pm

1 stop9h 43m

$424

OntarioGreen Bay

ONT - GRB

ONTGRB

Ontario

Wed 9/2

6:00 am-9:58 pm

2 stops13h 58m

Green Bay Austin-Straubel

Sun 9/6

5:30 am-4:14 pm

2 stops12h 44m

$444
Quickest round-trip

OntarioGreen Bay

ONT - GRB

ONTGRB

Ontario

Wed 5/27

6:30 am-3:09 pm

1 stop6h 39m

Green Bay Austin-Straubel

Wed 6/10

3:44 pm-10:46 pm

1 stop9h 02m

$447

OntarioGreen Bay

ONT - GRB

ONTGRB

Ontario

Sat 4/18

6:49 pm-10:00 am

2 stops13h 11m

Green Bay Austin-Straubel

Wed 4/22

5:40 pm-10:31 pm

1 stop6h 51m

$452

OntarioGreen Bay

ONT - GRB

ONTGRB

Ontario

Tue 5/19

6:59 pm-10:00 am

2 stops13h 01m

Green Bay Austin-Straubel

Tue 5/26

5:26 pm-10:46 pm

1 stop7h 20m

$464
Cheapest one-way

OntarioGreen Bay

ONT - GRB

ONTGRB

Ontario

Sat 4/25

7:05 am-9:59 pm

2 stops12h 54m

$224

OntarioGreen Bay

ONT - GRB

ONTGRB

Ontario

Sat 4/25

10:54 am-11:31 pm

2 stops10h 37m

$224

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/17

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 March.
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 $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.

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 March 18, 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
9,435 reviews

Overall

7.4

Entertainment

7.1

Boarding

7.7

Food

6.6

Comfort

7.3

Crew

8.1

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
9,435 reviews
United Airlines
7.4
Good
9,435 reviews

Overall

7.4

Entertainment

7.1

Boarding

7.7

Food

6.6

Comfort

7.3

Crew

8.1

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
11,468 reviews
United Airlines
7.4
Good
9,435 reviews

Overall

7.4

Entertainment

7.1

Boarding

7.7

Food

6.6

Comfort

7.3

Crew

8.1

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 8h 12m. Fly via American Airlines or Delta 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.

  • 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 $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

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Ontario to Green Bay

See prices for flight routes from nearby airports that may be better suited for you.
San Francisco to O'Hare Intl flights
Los Angeles to O'Hare Intl flights
Ontario to O'Hare Intl flights
Santa Ana to O'Hare Intl flights
San Diego to O'Hare Intl flights
Burbank to O'Hare Intl flights
San Jose to O'Hare Intl flights
Sacramento to O'Hare Intl flights
San Francisco to Minneapolis flights
Los Angeles to Minneapolis flights
Oakland to O'Hare Intl flights
San Diego to Minneapolis flights
Las Vegas to O'Hare Intl flights
Ontario to Minneapolis flights
Sacramento to Minneapolis flights
Los Angeles to Milwaukee flights
Santa Ana to Minneapolis flights
Fresno to O'Hare Intl flights
Las Vegas to Minneapolis flights
Palm Springs to O'Hare Intl flights
Long Beach to O'Hare Intl flights
San Jose to Minneapolis flights
San Francisco to Milwaukee flights
Santa Barbara to O'Hare Intl flights
Reno to O'Hare Intl flights
Ontario to Milwaukee flights
Las Vegas to Milwaukee flights
San Francisco to Madison flights
San Diego to Milwaukee flights
Los Angeles to Green Bay flights
Santa Ana to Milwaukee flights
Oakland to Minneapolis flights
Los Angeles to Madison flights
Reno to Minneapolis flights
Burbank to Minneapolis flights
Ontario to Madison flights
San Jose to Milwaukee flights
Sacramento to Milwaukee flights
Sacramento to Madison flights
Fresno to Minneapolis flights
Oakland to Milwaukee flights
San Diego to Madison flights
Monterey to O'Hare Intl flights
San Luis Obispo to O'Hare Intl flights
Santa Rosa to O'Hare Intl flights
Santa Ana to Madison flights
Burbank to Milwaukee flights
Burbank to Madison flights
San Diego to Appleton flights
Bakersfield to O'Hare Intl flights

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 March 18, 2026.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest$299Average$867FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$325Average$526FlexibilityNo cancel feeOn-time69%

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.