HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Green Bay

$329+ 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 10/1. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — GRB
Oct 16 — Oct 231
Thu 10/16
Thu 10/23
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

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 September 16, 2025.

Round-trip from

$339
(Delta)

One-way from

$329
(Delta)

Popular in

December

Cheapest in

January

Average price

$653
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, 2% potential price rise
Search Deals
Cheapest flight prices on average. 6% potential price decrease ($32 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in September 2025
Search Deals

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 September 16, 2025.

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.
Tue 9/3011:55 amONT - GRB
1 stop9h 05mDelta
Sat 10/45:34 amGRB - ONT
1 stop7h 08mDelta
Deal found 9/15$339
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.
Tue 9/306:36 pmONT - GRB
2 stops13h 29mUnited Airlines
Sat 10/41:20 pmGRB - ONT
2 stops10h 04mUnited Airlines
Deal found 9/15$349
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.
Fri 11/147:00 amONT - GRB
1 stop7h 46mUnited Airlines
Tue 11/1810:46 amGRB - ONT
1 stop9h 50mUnited Airlines
Deal found 9/14$494
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.
Thu 10/95:05 amONT - GRB
2 stops8h 04mUnited Airlines
Sat 10/1110:40 amGRB - ONT
1 stop9h 26mUnited Airlines
Deal found 9/14$505
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.
Thu 10/165:05 amONT - GRB
2 stops13h 53mUnited Airlines
Sun 11/23:51 pmGRB - ONT
1 stop8h 40mUnited Airlines
Deal found 9/14$515
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.
Tue 10/147:02 amONT - GRB
1 stop11h 56mUnited Airlines
Tue 10/215:25 pmGRB - ONT
1 stop7h 05mUnited Airlines
Deal found 9/14$527
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.
Thu 9/187:00 amONT - GRB
1 stop7h 50mUnited Airlines
Thu 9/255:25 pmGRB - ONT
1 stop7h 05mUnited Airlines
Deal found 9/15$544
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.
Fri 10/176:36 pmONT - GRB
2 stops13h 29mUnited Airlines
Sun 11/23:51 pmGRB - ONT
1 stop8h 40mUnited Airlines
Deal found 9/14$548

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 September 16, 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

Tue 9/30

10:00 pm-10:26 am

2 stops10h 26m

Green Bay Austin-Straubel

Sat 10/4

5:34 am-10:42 am

1 stop7h 08m

$344

OntarioGreen Bay

ONT - GRB

ONTGRB

Ontario

Fri 11/14

7:00 am-4:46 pm

1 stop7h 46m

Green Bay Austin-Straubel

Tue 11/18

10:46 am-6:36 pm

1 stop9h 50m

$494

OntarioGreen Bay

ONT - GRB

ONTGRB

Ontario

Tue 10/14

6:36 pm-10:05 am

2 stops13h 29m

Green Bay Austin-Straubel

Tue 10/21

2:40 pm-10:30 pm

1 stop9h 50m

$499

OntarioGreen Bay

ONT - GRB

ONTGRB

Ontario

Fri 3/6

6:00 am-10:35 am

2 stops26h 35m

Green Bay Austin-Straubel

Tue 3/10

1:10 pm-10:45 pm

2 stops11h 35m

$503

OntarioGreen Bay

ONT - GRB

ONTGRB

Ontario

Thu 10/9

7:02 am-3:09 pm

1 stop6h 07m

Green Bay Austin-Straubel

Sat 10/11

10:40 am-6:06 pm

1 stop9h 26m

$504

OntarioGreen Bay

ONT - GRB

ONTGRB

Ontario

Thu 10/16

5:05 am-8:58 pm

2 stops13h 53m

Green Bay Austin-Straubel

Sun 11/2

3:51 pm-10:31 pm

1 stop8h 40m

$515

OntarioGreen Bay

ONT - GRB

ONTGRB

Ontario

Wed 10/1

11:55 am-11:00 pm

1 stop9h 05m

$329

OntarioGreen Bay

ONT - GRB

ONTGRB

Ontario

Sat 12/20

11:59 pm-9:36 pm

1 stop19h 37m

$553

OntarioGreen Bay

ONT - GRB

ONTGRB

Ontario

Sat 12/20

10:29 pm-10:27 am

2 stops9h 58m

$1,436

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/15

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, January is the cheapest month in which you can book a flight from Ontario to Green Bay (average of $331). Flying from Ontario to Green Bay in July is currently the most expensive (average of $463). 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 September 16, 2025.

When flying from Ontario to Green Bay, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

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 September 16, 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
8.0
Very good
7,954 reviews

Food

7.3

Entertainment

7.9

Crew

8.5

Overall

8.0

Boarding

8.2

Comfort

7.9

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
8.0
Very good
7,954 reviews
Delta
8.0
Very good
7,954 reviews

Food

7.3

Entertainment

7.9

Crew

8.5

Overall

8.0

Boarding

8.2

Comfort

7.9

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
8,929 reviews
Delta
8.0
Very good
7,954 reviews

Food

7.3

Entertainment

7.9

Crew

8.5

Overall

8.0

Boarding

8.2

Comfort

7.9

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
10,000 reviews
Delta
8.0
Very good
7,954 reviews

Food

7.3

Entertainment

7.9

Crew

8.5

Overall

8.0

Boarding

8.2

Comfort

7.9

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 7h 46m. 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 41% 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, January is the cheapest month in which you can book a flight from Ontario to Green Bay (average of $331). Flying from Ontario to Green Bay in July is currently the most expensive (average of $463). 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

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.
Los Angeles to O'Hare Intl flights
San Francisco 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
Los Angeles to Minneapolis flights
San Francisco to Minneapolis flights
Las Vegas to O'Hare Intl flights
Sacramento to O'Hare Intl flights
Oakland to O'Hare Intl flights
Santa Ana to Minneapolis flights
San Diego to Minneapolis flights
Sacramento to Minneapolis flights
Ontario to Minneapolis flights
San Jose to Minneapolis flights
Las Vegas to Minneapolis flights
Los Angeles to Milwaukee flights
San Francisco to Madison flights
Palm Springs to O'Hare Intl flights
Reno to O'Hare Intl flights
Fresno to O'Hare Intl flights
San Francisco to Milwaukee flights
Long Beach to O'Hare Intl flights
Los Angeles to Madison flights
San Diego to Madison flights
Ontario to Milwaukee flights
Oakland to Minneapolis flights
Palm Springs to Minneapolis flights
Los Angeles to Green Bay flights
San Diego to Milwaukee flights
Las Vegas to Milwaukee flights
Reno to Minneapolis flights
San Jose to Milwaukee flights
Los Angeles to Appleton flights
Burbank to Minneapolis flights
Sacramento to Madison flights
Ontario to Madison flights
San Jose to Madison flights
San Francisco to Appleton flights
Santa Rosa to O'Hare Intl flights
Oakland to Milwaukee flights
Fresno to Minneapolis flights
Santa Ana to Milwaukee flights
Burbank to Milwaukee flights
San Francisco to Green Bay flights
Santa Barbara to O'Hare Intl flights
Las Vegas to Madison flights

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 September 16, 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$298Average$608FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$299Average$867FlexibilityNo cancel feeOn-time71%
DeltaCheapest$371Average$464FlexibilityNo cancel feeOn-timeN/A

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.