$302+ Cheap flights from Green Bay to Ontario (GRB - ONT)
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 12/15. Fares are subject to change and may not be available on all flights or dates of travel.
GRB — ONT
Dec 5 — Dec 121
Round-trip
1 adult, Economy
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Find cheap flights from Green Bay to Ontario 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 Green Bay to Ontario
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Cheapest flights from Green Bay to OntarioExplore the most affordable flight options available from Green Bay to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on November 5, 2026.
Explore the most affordable flight options available from Green Bay to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on November 5, 2026.
This United Airlines deal was found by Cheapflights users on 11/2. 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.
Mon 11/231:32 pm -
2 stops11h 16m
Fri 11/277:00 am -
1 stop7h 52m
Deal found 11/2![United Airlines logo]()
$384
This United Airlines deal was found by Cheapflights users on 11/3. 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 12/51:15 pm -
1 stop7h 29m
Wed 12/97:00 am -
1 stop7h 52m
Deal found 11/3![United Airlines logo]()
$499
This United Airlines deal was found by Cheapflights users on 11/4. 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 12/81:06 pm -
2 stops10h 05m
Sat 12/121:40 pm -
2 stops25h 12m
Deal found 11/4![United Airlines logo]()
$597
This United Airlines deal was found by Cheapflights users on 11/3. 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 12/91:06 pm -
1 stop7h 38m
Sat 12/127:00 am -
1 stop7h 52m
Deal found 11/3![United Airlines logo]()
$629
This United Airlines deal was found by Cheapflights users on 11/1. 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 12/51:15 pm -
1 stop7h 29m
Sat 12/127:00 am -
1 stop7h 52m
Deal found 11/1![United Airlines logo]()
$633
This United Airlines deal was found by Cheapflights users on 11/1. 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 12/11:15 pm -
2 stops9h 56m
Wed 12/97:00 am -
1 stop7h 52m
Deal found 11/1![United Airlines logo]()
$634
Best flights from Green Bay to OntarioDiscover carefully curated flight deals from Green Bay to Ontario that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated November 5, 2026.
Discover carefully curated flight deals from Green Bay to Ontario that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated November 5, 2026.
This United Airlines deal was found by Cheapflights users on 11/2. 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.
Mon 11/231:32 pm -
2 stops11h 16m
Fri 11/277:00 am -
1 stop7h 52m
Deal found 11/2![United Airlines logo]()
$384
This United Airlines deal was found by Cheapflights users on 11/4. 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 4/35:18 pm -
1 stop7h 13m
Tue 4/66:53 pm -
2 stops13h 37m
Deal found 11/4![United Airlines logo]()
$394
This United Airlines deal was found by Cheapflights users on 11/2. 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 1/71:22 pm -
1 stop7h 28m
Sun 1/105:00 am -
2 stops10h 11m
Deal found 11/2![United Airlines logo]()
$441
This United Airlines deal was found by Cheapflights users on 11/3. 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 12/51:15 pm -
1 stop7h 29m
Wed 12/97:00 am -
1 stop7h 52m
Deal found 11/3![United Airlines logo]()
$499
This United Airlines deal was found by Cheapflights users on 11/4. 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 12/119:45 am -
2 stops13h 26m
Mon 12/146:40 pm -
2 stops12h 19m
Deal found 11/4![United Airlines logo]()
$509
This United Airlines deal was found by Cheapflights users on 11/3. 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 2/29:55 am -
2 stops13h 05m
Mon 2/86:37 pm -
2 stops12h 30m
Deal found 11/3![United Airlines logo]()
$509
This United Airlines deal was found by Cheapflights users on 11/3. 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 2/179:55 am -
2 stops13h 22m
Tue 2/236:00 am -
2 stops13h 21m
Deal found 11/3![United Airlines logo]()
$509
This United Airlines deal was found by Cheapflights users on 11/1. 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 2/189:55 am -
2 stops12h 39m
Tue 2/236:00 am -
2 stops13h 21m
Deal found 11/1![United Airlines logo]()
$519
Last-minute flights from Green Bay to OntarioDiscover last-minute flight deals from Green Bay to Ontario. Data last updated November 5, 2026 and is based on user searches.
Discover last-minute flight deals from Green Bay to Ontario. Data last updated November 5, 2026 and is based on user searches.
This United Airlines deal was found by Cheapflights users on 11/2. 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.
Mon 11/231:32 pm -
2 stops11h 16m
Fri 11/277:00 am -
1 stop7h 52m
Deal found 11/2![United Airlines logo]()
$384
This United Airlines deal was found by Cheapflights users on 11/1. 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 12/11:15 pm -
2 stops9h 56m
Wed 12/97:00 am -
1 stop7h 52m
Deal found 11/1![United Airlines logo]()
$634
This United Airlines deal was found by Cheapflights users on 11/3. 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 12/51:15 pm -
1 stop7h 29m
Wed 12/97:00 am -
1 stop7h 52m
Deal found 11/3![United Airlines logo]()
$499
This United Airlines deal was found by Cheapflights users on 11/1. 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 12/51:15 pm -
1 stop7h 29m
Sat 12/127:00 am -
1 stop7h 52m
Deal found 11/1![United Airlines logo]()
$633
This United Airlines deal was found by Cheapflights users on 11/4. 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 12/81:06 pm -
2 stops10h 05m
Sat 12/121:40 pm -
2 stops25h 12m
Deal found 11/4![United Airlines logo]()
$597
This United Airlines deal was found by Cheapflights users on 11/3. 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 12/91:06 pm -
1 stop7h 38m
Sat 12/127:00 am -
1 stop7h 52m
Deal found 11/3![United Airlines logo]()
$629
One-way flights from Green Bay to OntarioSearch for one-way flight options from Green Bay to Ontario. Find affordable one-way fares based on user searches. Data last updated November 5, 2026.
Search for one-way flight options from Green Bay to Ontario. Find affordable one-way fares based on user searches. Data last updated November 5, 2026.
This United Airlines deal was found by Cheapflights users on 11/4. 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 12/155:00 am -
2 stops14h 36m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 11/4![United Airlines logo]()
$302
This American Airlines deal was found by Cheapflights users on 11/4. 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 12/32:33 pm -
2 stops9h 20m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 11/4![American Airlines logo]()
$374
This United Airlines deal was found by Cheapflights users on 11/4. 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 12/31:15 pm -
1 stop7h 29m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 11/4![United Airlines logo]()
$380
This United Airlines deal was found by Cheapflights users on 11/3. 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 11/171:37 pm -
1 stop7h 10m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 11/3![United Airlines logo]()
$412
This United Airlines deal was found by Cheapflights users on 10/31. 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 12/178:00 am -
1 stop16h 31m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/31![United Airlines logo]()
$423
This American Airlines deal was found by Cheapflights users on 11/3. 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.
Sun 4/259:42 am -
2 stops8h 40m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 11/3![American Airlines logo]()
$526
This United Airlines deal was found by Cheapflights users on 11/2. 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 12/226:00 am -
2 stops8h 42m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 11/2![United Airlines logo]()
$545
Find flight deals from Green Bay to Ontario
Discover tips and strategies to find the most affordable flight options for your journey from Green Bay (GRB) to Ontario (ONT). 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 November 5, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $384 (United Airlines) |
One-way from | $302 (United Airlines) |
Popular in | March |
Cheapest in | December |
Average price | $403 |
Cheapflights Fare Finder
Customize your flight search to find flights from Green Bay to Ontario 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 7,457,451 searches. Data last updated November 5, 2026.
Use the filters below to find and compare flights from Green Bay to Ontario that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
Green BayOntario
GRB Green Bay Austin-Straubel - ONT Ontario
GRBONT
Green Bay Austin-Straubel
Tue 12/15
5:00 am-5:36 pm
2 stops14h 36m
Ontario
Wed 12/31
12:00 am-2:00 am
Nonstop0h 00m
$302
Green BayOntario
GRB Green Bay Austin-Straubel - ONT Ontario
GRBONT
Green Bay Austin-Straubel
Tue 12/22
3:26 pm-10:31 pm
1 stop9h 05m
Ontario
Wed 12/31
12:00 am-2:00 am
Nonstop0h 00m
$380
Quickest round-trip
Green BayOntario
GRB Green Bay Austin-Straubel - ONT Ontario
GRBONT
Green Bay Austin-Straubel
Thu 12/3
1:15 pm-6:44 pm
1 stop7h 29m
Ontario
Wed 12/31
12:00 am-2:00 am
Nonstop0h 00m
$380
Green BayOntario
GRB Green Bay Austin-Straubel - ONT Ontario
GRBONT
Green Bay Austin-Straubel
Mon 11/23
1:32 pm-10:48 pm
2 stops11h 16m
Ontario
Fri 11/27
7:00 am-4:52 pm
1 stop7h 52m
$384
Green BayOntario
GRB Green Bay Austin-Straubel - ONT Ontario
GRBONT
Green Bay Austin-Straubel
Sat 4/3
5:18 pm-10:31 pm
1 stop7h 13m
Ontario
Tue 4/6
6:53 pm-10:30 am
2 stops13h 37m
$394
Green BayOntario
GRB Green Bay Austin-Straubel - ONT Ontario
GRBONT
Green Bay Austin-Straubel
Tue 11/17
10:37 am-9:40 pm
2 stops13h 03m
Ontario
Wed 12/31
12:00 am-2:00 am
Nonstop0h 00m
$417
Green BayOntario
GRB Green Bay Austin-Straubel - ONT Ontario
GRBONT
Green Bay Austin-Straubel
Thu 12/17
8:00 am-10:31 pm
1 stop16h 31m
Ontario
Wed 12/31
12:00 am-2:00 am
Nonstop0h 00m
$423
Green BayOntario
GRB Green Bay Austin-Straubel - ONT Ontario
GRBONT
Green Bay Austin-Straubel
Thu 1/7
1:22 pm-6:50 pm
1 stop7h 28m
Ontario
Sun 1/10
5:00 am-5:11 pm
2 stops10h 11m
$441
Green BayOntario
GRB Green Bay Austin-Straubel - ONT Ontario
GRBONT
Green Bay Austin-Straubel
Sat 12/5
1:15 pm-6:44 pm
1 stop7h 29m
Ontario
Wed 12/9
7:00 am-4:52 pm
1 stop7h 52m
$499
Green BayOntario
GRB Green Bay Austin-Straubel - ONT Ontario
GRBONT
Green Bay Austin-Straubel
Fri 12/11
9:45 am-9:11 pm
2 stops13h 26m
Ontario
Mon 12/14
6:40 pm-8:59 am
2 stops12h 19m
$509
Showing 1-10 of 15 resultsSorted by cheapest first
Compare providers for flights from Green Bay to Ontario
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 Green Bay to Ontario in November.
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy1 star | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy2 stars | Trust Score*3 stars |
- Most accurate provider: When it comes to deals on Green Bay-Ontario flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Green Bay-Ontario flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Green Bay-Ontario flight searches over the past month and is updated monthly.
- Most trusted provider: When it comes to deals on Green Bay-Ontario 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 Green Bay-Ontario 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 Green Bay to Ontario
Have a flexible travel schedule? Discover the best time to fly to Ontario from Green Bay with our price prediction graph.
GRB-ONT
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 Green Bay to Ontario
Reviews of airlines servicing Ontario
Get insights into the airlines that provide service to Ontario. 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 Ontario. Reviews last updated November 5, 2026.
Get a feel of what it's like to fly with Delta and United Airlines from Green Bay to Ontario by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Boarding
8.1
Comfort
7.8
Crew
8.5
Overall
7.8
Food
7.2
Entertainment
7.8
Reviews
1 / 20
10.0
ExcellentAaron,Oct 2024
TUS - LAX
Boarding
8.1
Comfort
7.8
Crew
8.5
Overall
7.8
Food
7.2
Entertainment
7.8
Reviews
1 / 20
10.0
ExcellentAaron,Oct 2024
TUS - LAX
Boarding
8.1
Comfort
7.8
Crew
8.5
Overall
7.8
Food
7.2
Entertainment
7.8
Reviews
1 / 20
10.0
ExcellentAaron,Oct 2024
TUS - LAX
Related info for your journey
Find useful and relevant information for your journey from Green Bay to Ontario. 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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Complete your trip
Complete your trip to Ontario by adding a car rental and/or hotel reservation to your travel itinerary.
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Other flights to Ontario
Explore flights to Ontario departing from other origins. Flights are based on user searches made on Cheapflights and were last updated on November 5, 2026.
Green Bay and Ontario flights
Browse other Green Bay and Ontario flight options. Last updated on November 5, 2026.
Other flights from Green Bay
Browse through other flights departing from Green Bay. Flights are based on user searches made on Cheapflights and were last updated on November 5, 2026.
Popular flight searches
Check out other popular destinations found by fellow travelers in 2026
Top 2 airlines flying from Green Bay to Ontario
Discover the top 2 airlines that operate flights from Green Bay to Ontario. 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 7,457,451 searches. Data last updated November 5, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$256 | Average$479 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$288 | Average$403 | FlexibilityNo cancel fee | On-time69% |