$359+ Cheap flights from Ontario to Green Bay (ONT - GRB)
This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 8/20. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — GRB
Aug 28 — Sep 41
Round-trip
1 adult, Economy
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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
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Best
Last-minute
One-way
Cheapest flights from Ontario to Green BayExplore 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 July 29, 2026.
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 July 29, 2026.
This Delta deal was found by Cheapflights users on 7/26. 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 8/2012:00 pm
ONT
- GRB
1 stop8h 34m
Delta
Wed 8/265:30 am
GRB
- ONT
1 stop7h 12m
Delta
Deal found 7/26![Delta logo]()
$359
This Delta deal was found by Cheapflights users on 7/27. 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.
Thu 8/1312:00 pm
ONT
- GRB
1 stop8h 06m
Delta
Tue 8/185:24 am
GRB
- ONT
1 stop7h 18m
Delta
Deal found 7/27![Delta logo]()
$394
This American Airlines deal was found by Cheapflights users on 7/27. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/247:11 pm
ONT
- GRB
2 stops12h 24m
American Airlines
Tue 10/69:58 am
GRB
- ONT
2 stops10h 45m
American Airlines
Deal found 7/27![American Airlines logo]()
$396
This American Airlines deal was found by Cheapflights users on 7/26. 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 8/2012:59 pm
ONT
- GRB
2 stops9h 17m
American Airlines
Wed 8/265:55 am
GRB
- ONT
2 stops14h 20m
American Airlines
Deal found 7/26![American Airlines logo]()
$410
This Delta deal was found by Cheapflights users on 7/27. 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 8/412:00 pm
ONT
- GRB
1 stop8h 06m
Delta
Wed 8/195:24 am
GRB
- ONT
1 stop7h 18m
Delta
Deal found 7/27![Delta logo]()
$435
Best flights from Ontario to Green BayDiscover carefully curated flight deals from Ontario to Green Bay that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated July 29, 2026.
Discover carefully curated flight deals from Ontario to Green Bay that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated July 29, 2026.
This Delta deal was found by Cheapflights users on 7/26. 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 8/2012:00 pm
ONT
- GRB
1 stop8h 34m
Delta
Wed 8/264:13 pm
GRB
- ONT
2 stops9h 21m
Delta
Deal found 7/26![Delta logo]()
$364
This United Airlines deal was found by Cheapflights users on 7/28. 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.
Tue 11/36:00 am
ONT
- GRB
2 stops13h 26m
United Airlines
Fri 11/131:32 pm
GRB
- ONT
1 stop7h 15m
United Airlines
Deal found 7/28![United Airlines logo]()
$529
This Delta deal was found by Cheapflights users on 7/26. 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 8/1312:00 pm
ONT
- GRB
1 stop8h 06m
Delta
Tue 8/185:24 am
GRB
- ONT
1 stop7h 18m
Delta
Deal found 7/26![Delta logo]()
$394
This Delta deal was found by Cheapflights users on 7/25. 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.
Thu 8/1312:00 pm
ONT
- GRB
1 stop8h 06m
Delta
Sun 8/165:24 am
GRB
- ONT
1 stop7h 18m
Delta
Deal found 7/25![Delta logo]()
$464
This Delta deal was found by Cheapflights users on 7/27. 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.
Thu 9/2412:19 pm
ONT
- GRB
1 stop8h 05m
Delta
Tue 10/65:30 am
GRB
- ONT
1 stop7h 36m
Delta
Deal found 7/27![Delta logo]()
$519
This United Airlines deal was found by Cheapflights users on 7/26. 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 10/276:00 am
ONT
- GRB
2 stops13h 26m
United Airlines
Sun 11/11:32 pm
GRB
- ONT
1 stop7h 15m
United Airlines
Deal found 7/26![United Airlines logo]()
$663
This United Airlines deal was found by Cheapflights users on 7/27. 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 8/217:13 pm
ONT
- GRB
2 stops12h 46m
United Airlines
Sun 8/235:29 pm
GRB
- ONT
1 stop7h 06m
United Airlines
Deal found 7/27![United Airlines logo]()
$717
This United Airlines deal was found by Cheapflights users on 7/28. 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.
Wed 8/125:00 am
ONT
- GRB
2 stops9h 54m
United Airlines
Tue 8/185:29 pm
GRB
- ONT
1 stop7h 06m
United Airlines
Deal found 7/28![United Airlines logo]()
$729
This Delta deal was found by Cheapflights users on 7/28. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/1312:00 pm
ONT
- GRB
1 stop8h 06m
Delta
Mon 8/175:24 am
GRB
- ONT
1 stop7h 18m
Delta
Deal found 7/28![Delta logo]()
$684
This Delta deal was found by Cheapflights users on 7/28. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/1412:00 pm
ONT
- GRB
1 stop8h 06m
Delta
Mon 8/175:24 am
GRB
- ONT
1 stop7h 18m
Delta
Deal found 7/28![Delta logo]()
$684
Last-minute flights from Ontario to Green BayDiscover last-minute flight deals from Ontario to Green Bay. Data last updated July 29, 2026 and is based on user searches.
Discover last-minute flight deals from Ontario to Green Bay. Data last updated July 29, 2026 and is based on user searches.
This Delta deal was found by Cheapflights users on 7/27. 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 8/412:00 pm
ONT
- GRB
1 stop8h 06m
Delta
Tue 8/185:24 am
GRB
- ONT
1 stop7h 18m
Delta
Deal found 7/27![Delta logo]()
$435
This Delta deal was found by Cheapflights users on 7/27. 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.
Thu 8/1312:00 pm
ONT
- GRB
1 stop8h 06m
Delta
Tue 8/185:24 am
GRB
- ONT
1 stop7h 18m
Delta
Deal found 7/27![Delta logo]()
$394
This American Airlines deal was found by Cheapflights users on 7/28. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/1312:59 pm
ONT
- GRB
2 stops9h 17m
American Airlines
Tue 8/187:02 pm
GRB
- ONT
2 stops19h 01m
American Airlines
Deal found 7/28![American Airlines logo]()
$437
This Delta deal was found by Cheapflights users on 7/28. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/1412:00 pm
ONT
- GRB
1 stop8h 06m
Delta
Tue 8/255:30 am
GRB
- ONT
1 stop7h 12m
Delta
Deal found 7/28![Delta logo]()
$454
This Delta deal was found by Cheapflights users on 7/26. 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 8/2012:00 pm
ONT
- GRB
1 stop8h 34m
Delta
Wed 8/265:30 am
GRB
- ONT
1 stop7h 12m
Delta
Deal found 7/26![Delta logo]()
$359
This American Airlines deal was found by Cheapflights users on 7/26. 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 8/2012:59 pm
ONT
- GRB
2 stops9h 17m
American Airlines
Wed 8/265:55 am
GRB
- ONT
2 stops14h 20m
American Airlines
Deal found 7/26![American Airlines logo]()
$410
One-way flights from Ontario to Green BaySearch for one-way flight options from Ontario to Green Bay. Find affordable one-way fares based on user searches. Data last updated July 29, 2026.
Search for one-way flight options from Ontario to Green Bay. Find affordable one-way fares based on user searches. Data last updated July 29, 2026.
This United Airlines deal was found by Cheapflights users on 7/28. 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.
Fri 9/187:13 pm
ONT
- GRB
2 stops12h 07m
United Airlines
Deal found 7/28![United Airlines logo]()
$359
This United Airlines deal was found by Cheapflights users on 7/28. 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.
Fri 9/117:00 am
ONT
- GRB
1 stop6h 43m
United Airlines
Deal found 7/28![United Airlines logo]()
$380
This United Airlines deal was found by Cheapflights users on 7/23. 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 8/137:13 pm
ONT
- GRB
2 stops12h 46m
United Airlines
Deal found 7/23![United Airlines logo]()
$385
This United Airlines deal was found by Cheapflights users on 7/27. 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 9/241:24 pm
ONT
- GRB
2 stops7h 55m
United Airlines
Deal found 7/27![United Airlines logo]()
$438
This United Airlines deal was found by Cheapflights users on 7/24. 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 8/197:00 am
ONT
- GRB
1 stop7h 54m
United Airlines
Deal found 7/24![United Airlines logo]()
$530
This United Airlines deal was found by Cheapflights users on 7/24. 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 8/55:00 am
ONT
- GRB
2 stops12h 10m
United Airlines
Deal found 7/24![United Airlines logo]()
$535
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 July 29, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $359 (Delta) |
One-way from | $359 (United Airlines) |
Popular in | March |
Cheapest in | January |
Average price | $592 |
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 July 29, 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
Cheapest round-trip
OntarioGreen Bay
ONT - GRB
ONTGRB
Ontario
Thu 8/20
12:00 pm-10:34 pm
1 stop8h 34m
Green Bay Austin-Straubel
Wed 8/26
4:13 pm-11:34 pm
2 stops9h 21m
$364
Quickest round-trip
OntarioGreen Bay
ONT - GRB
ONTGRB
Ontario
Thu 8/13
12:00 pm-10:06 pm
1 stop8h 06m
Green Bay Austin-Straubel
Tue 8/18
5:24 am-10:42 am
1 stop7h 18m
$394
OntarioGreen Bay
ONT - GRB
ONTGRB
Ontario
Thu 8/13
12:00 pm-10:06 pm
1 stop8h 06m
Green Bay Austin-Straubel
Sun 8/16
5:24 am-10:42 am
1 stop7h 18m
$464
OntarioGreen Bay
ONT - GRB
ONTGRB
Ontario
Thu 9/24
12:19 pm-10:24 pm
1 stop8h 05m
Green Bay Austin-Straubel
Tue 10/6
5:30 am-11:06 am
1 stop7h 36m
$519
OntarioGreen Bay
ONT - GRB
ONTGRB
Ontario
Tue 11/3
6:00 am-9:26 pm
2 stops13h 26m
Green Bay Austin-Straubel
Fri 11/13
1:32 pm-6:47 pm
1 stop7h 15m
$529
OntarioGreen Bay
ONT - GRB
ONTGRB
Ontario
Tue 10/27
6:00 am-9:26 pm
2 stops13h 26m
Green Bay Austin-Straubel
Sun 11/1
1:32 pm-6:47 pm
1 stop7h 15m
$663
OntarioGreen Bay
ONT - GRB
ONTGRB
Ontario
Thu 8/13
12:00 pm-10:06 pm
1 stop8h 06m
Green Bay Austin-Straubel
Mon 8/17
5:24 am-10:42 am
1 stop7h 18m
$684
OntarioGreen Bay
ONT - GRB
ONTGRB
Ontario
Fri 8/14
12:00 pm-10:06 pm
1 stop8h 06m
Green Bay Austin-Straubel
Mon 8/17
5:24 am-10:42 am
1 stop7h 18m
$684
OntarioGreen Bay
ONT - GRB
ONTGRB
Ontario
Fri 8/21
7:13 pm-9:59 am
2 stops12h 46m
Green Bay Austin-Straubel
Sun 8/23
5:29 pm-10:35 pm
1 stop7h 06m
$717
OntarioGreen Bay
ONT - GRB
ONTGRB
Ontario
Wed 8/12
5:00 am-4:54 pm
2 stops9h 54m
Green Bay Austin-Straubel
Tue 8/18
5:29 pm-10:35 pm
1 stop7h 06m
$729
Showing 1-10 of 14 resultsSorted by cheapest first
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 July.
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy1 star | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars |
- 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.
ONT-GRB
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 July 29, 2026.
Peruse reviews from past customers who have flown with Delta and United 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.
Crew
8.5
Food
7.2
Boarding
8.1
Comfort
7.8
Entertainment
7.8
Overall
7.8
Reviews
1 / 20
10.0
ExcellentMichael,Sep 2023
SMF - ATL
Crew
8.5
Food
7.2
Boarding
8.1
Comfort
7.8
Entertainment
7.8
Overall
7.8
Reviews
1 / 20
10.0
ExcellentMichael,Sep 2023
SMF - ATL
Crew
8.5
Food
7.2
Boarding
8.1
Comfort
7.8
Entertainment
7.8
Overall
7.8
Reviews
1 / 20
10.0
ExcellentMichael,Sep 2023
SMF - ATL
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.
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Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.
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Complete your trip
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Green Bay flight routes
Other flight options
Other flights from Ontario
Popular flights
Alternative routes for Ontario to Green Bay
See prices for flight routes from nearby airports that may be better suited for you.
Complete your trip
Complete your trip to Green Bay by adding a car rental and/or hotel reservation to your travel itinerary.
Search flights from Ontario to Green Bay by cabin class
Find flights from Ontario to Green Bay, based on your preferred cabin class, be it economy, premium economy, business, or first class.
Other flights to Green Bay
Explore flights to Green Bay departing from other origins. Flights are based on user searches made on Cheapflights and were last updated on July 29, 2026.
Ontario and Green Bay flights
Browse other Ontario and Green Bay flight options. Last updated on July 29, 2026.
Other flights from Ontario
Browse through other flights departing from Ontario. Flights are based on user searches made on Cheapflights and were last updated on July 29, 2026.
Popular flight searches
Check out other popular destinations found by fellow travelers in 2026
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 July 29, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$230 | Average$537 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$344 | Average$510 | FlexibilityNo cancel fee | On-time69% |