$299+ Cheap flights from Green Bay to Ontario (GRB - ONT)
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 8/21. Fares are subject to change and may not be available on all flights or dates of travel.
GRB — ONT
Jul 21 — Jul 281
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 June 21, 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 June 21, 2026.
This Delta deal was found by Cheapflights users on 6/21. 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.
Sun 10/255:30 am
GRB
- ONT
2 stops12h 42m
Delta
Mon 11/25:50 pm
ONT
- GRB
2 stops14h 33m
Delta
Deal found 6/21![Delta logo]()
$359
This United Airlines deal was found by Cheapflights users on 6/18. 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.
Sat 9/55:29 pm
GRB
- ONT
1 stop7h 06m
United Airlines
Sat 9/127:00 am
ONT
- GRB
1 stop6h 43m
United Airlines
Deal found 6/18![United Airlines logo]()
$394
This American Airlines deal was found by Cheapflights users on 6/18. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/55:37 am
GRB
- ONT
2 stops14h 38m
American Airlines
Sat 9/121:05 pm
ONT
- GRB
2 stops9h 08m
American Airlines
Deal found 6/18![American Airlines logo]()
$447
This United Airlines deal was found by Cheapflights users on 6/17. 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.
Sat 10/312:30 pm
GRB
- ONT
1 stop9h 56m
United Airlines
Tue 11/36:53 pm
ONT
- GRB
2 stops13h 37m
United Airlines
Deal found 6/17![United Airlines logo]()
$454
This American Airlines deal was found by Cheapflights users on 6/18. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/216:55 pm
GRB
- ONT
2 stops19h 08m
American Airlines
Thu 8/2712:59 pm
ONT
- GRB
2 stops9h 17m
American Airlines
Deal found 6/18![American Airlines logo]()
$506
This United Airlines deal was found by Cheapflights users on 6/16. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/241:17 pm
GRB
- ONT
2 stops11h 42m
United Airlines
Tue 10/275:00 am
ONT
- GRB
2 stops15h 49m
United Airlines
Deal found 6/16![United Airlines logo]()
$518
This Delta deal was found by Cheapflights users on 6/19. 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 6/245:10 am
GRB
- ONT
1 stop7h 30m
Delta
Mon 6/2911:50 am
ONT
- GRB
1 stop9h 01m
Delta
Deal found 6/19![Delta logo]()
$535
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 June 21, 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 June 21, 2026.
This United Airlines deal was found by Cheapflights users on 6/18. 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.
Sat 9/55:29 pm
GRB
- ONT
1 stop7h 06m
United Airlines
Sat 9/127:00 am
ONT
- GRB
1 stop6h 43m
United Airlines
Deal found 6/18![United Airlines logo]()
$394
This American Airlines deal was found by Cheapflights users on 6/21. 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 7/411:16 am
GRB
- ONT
2 stops10h 43m
American Airlines
Mon 7/131:11 pm
ONT
- GRB
2 stops9h 01m
American Airlines
Deal found 6/21![American Airlines logo]()
$593
This Delta deal was found by Cheapflights users on 6/20. 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 6/265:10 am
GRB
- ONT
1 stop7h 30m
Delta
Sun 6/2811:50 am
ONT
- GRB
1 stop9h 01m
Delta
Deal found 6/20![Delta logo]()
$729
This United Airlines deal was found by Cheapflights users on 6/20. 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 7/43:44 pm
GRB
- ONT
1 stop9h 07m
United Airlines
Mon 7/136:39 pm
ONT
- GRB
2 stops13h 22m
United Airlines
Deal found 6/20![United Airlines logo]()
$635
This United Airlines deal was found by Cheapflights users on 6/19. 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 6/273:44 pm
GRB
- ONT
1 stop9h 07m
United Airlines
Mon 6/295:45 am
ONT
- GRB
2 stops11h 26m
United Airlines
Deal found 6/19![United Airlines logo]()
$645
This United Airlines deal was found by Cheapflights users on 6/21. 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 8/46:52 pm
GRB
- ONT
2 stops19h 20m
United Airlines
Fri 8/76:00 am
ONT
- GRB
2 stops26h 01m
United Airlines
Deal found 6/21![United Airlines logo]()
$718
Last-minute flights from Green Bay to OntarioDiscover last-minute flight deals from Green Bay to Ontario. Data last updated June 21, 2026 and is based on user searches.
Discover last-minute flight deals from Green Bay to Ontario. Data last updated June 21, 2026 and is based on user searches.
This Delta deal was found by Cheapflights users on 6/19. 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 6/245:10 am
GRB
- ONT
1 stop7h 30m
Delta
Mon 6/2911:50 am
ONT
- GRB
1 stop9h 01m
Delta
Deal found 6/19![Delta logo]()
$535
This Delta deal was found by Cheapflights users on 6/19. 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 6/245:10 am
GRB
- ONT
1 stop7h 30m
Delta
Sun 6/2811:50 am
ONT
- GRB
1 stop9h 01m
Delta
Deal found 6/19![Delta logo]()
$610
This United Airlines deal was found by Cheapflights users on 6/19. 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 6/263:44 pm
GRB
- ONT
1 stop9h 07m
United Airlines
Wed 7/16:39 pm
ONT
- GRB
2 stops13h 22m
United Airlines
Deal found 6/19![United Airlines logo]()
$649
This Delta deal was found by Cheapflights users on 6/20. 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 6/265:10 am
GRB
- ONT
1 stop7h 30m
Delta
Mon 6/2911:50 am
ONT
- GRB
1 stop9h 01m
Delta
Deal found 6/20![Delta logo]()
$654
This American Airlines deal was found by Cheapflights users on 6/20. 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.
Fri 6/2612:59 pm
GRB
- ONT
2 stops10h 58m
American Airlines
Sat 6/271:11 pm
ONT
- GRB
2 stops9h 32m
American Airlines
Deal found 6/20![American Airlines logo]()
$671
This United Airlines deal was found by Cheapflights users on 6/19. 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 6/273:44 pm
GRB
- ONT
1 stop9h 07m
United Airlines
Mon 6/295:45 am
ONT
- GRB
2 stops11h 26m
United Airlines
Deal found 6/19![United Airlines logo]()
$645
This American Airlines deal was found by Cheapflights users on 6/20. 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 7/411:16 am
GRB
- ONT
2 stops10h 43m
American Airlines
Mon 7/131:11 pm
ONT
- GRB
2 stops9h 01m
American Airlines
Deal found 6/20![American Airlines logo]()
$593
This Delta deal was found by Cheapflights users on 6/21. 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 7/45:45 am
GRB
- ONT
2 stops12h 56m
Delta
Mon 7/1311:48 am
ONT
- GRB
1 stop9h 00m
Delta
Deal found 6/21![Delta logo]()
$604
This United Airlines deal was found by Cheapflights users on 6/20. 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 7/43:44 pm
GRB
- ONT
1 stop9h 07m
United Airlines
Mon 7/136:39 pm
ONT
- GRB
2 stops13h 22m
United Airlines
Deal found 6/20![United Airlines logo]()
$635
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 June 21, 2026.
Search for one-way flight options from Green Bay to Ontario. Find affordable one-way fares based on user searches. Data last updated June 21, 2026.
This Delta deal was found by Cheapflights users on 6/18. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/215:30 am
GRB
- ONT
1 stop7h 12m
Delta
Deal found 6/18![Delta logo]()
$299
This Delta deal was found by Cheapflights users on 6/20. 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.
Mon 8/35:24 am
GRB
- ONT
1 stop7h 18m
Delta
Deal found 6/20![Delta logo]()
$320
This Delta deal was found by Cheapflights users on 6/21. 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 7/175:10 am
GRB
- ONT
1 stop7h 28m
Delta
Deal found 6/21![Delta logo]()
$359
This American Airlines deal was found by Cheapflights users on 6/20. 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.
Fri 7/171:01 pm
GRB
- ONT
2 stops11h 33m
American Airlines
Deal found 6/20![American Airlines logo]()
$364
This United Airlines deal was found by Cheapflights users on 6/20. 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 8/43:44 pm
GRB
- ONT
1 stop9h 07m
United Airlines
Deal found 6/20![United Airlines logo]()
$380
This United Airlines deal was found by Cheapflights users on 6/20. 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 8/512:34 pm
GRB
- ONT
2 stops12h 03m
United Airlines
Deal found 6/20![United Airlines logo]()
$383
This United Airlines deal was found by Cheapflights users on 6/20. 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 8/19:00 am
GRB
- ONT
2 stops14h 55m
United Airlines
Deal found 6/20![United Airlines logo]()
$384
This United Airlines deal was found by Cheapflights users on 6/17. 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.
Tue 7/1412:34 pm
GRB
- ONT
2 stops12h 03m
United Airlines
Deal found 6/17![United Airlines logo]()
$385
This American Airlines deal was found by Cheapflights users on 6/20. 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.
Fri 8/75:55 am
GRB
- ONT
2 stops11h 24m
American Airlines
Deal found 6/20![American Airlines logo]()
$395
This United Airlines deal was found by Cheapflights users on 6/18. 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.
Fri 7/173:44 pm
GRB
- ONT
1 stop9h 07m
United Airlines
Deal found 6/18![United Airlines logo]()
$398
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 June 21, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $359 (Delta) |
One-way from | $299 (Delta) |
Popular in | November |
Cheapest in | October |
Average price | $374 |
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 2,558,603 searches. Data last updated June 21, 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
Quickest round-trip
Green BayOntario
GRB - ONT
GRBONT
Green Bay Austin-Straubel
Sat 9/5
5:29 pm-10:35 pm
1 stop7h 06m
Ontario
Sat 9/12
7:00 am-3:43 pm
1 stop6h 43m
$394
Green BayOntario
GRB - ONT
GRBONT
Green Bay Austin-Straubel
Sat 7/4
11:16 am-7:59 pm
2 stops10h 43m
Ontario
Mon 7/13
1:11 pm-12:12 am
2 stops9h 01m
$593
Green BayOntario
GRB - ONT
GRBONT
Green Bay Austin-Straubel
Sat 7/4
3:44 pm-10:51 pm
1 stop9h 07m
Ontario
Mon 7/13
6:39 pm-10:01 am
2 stops13h 22m
$635
Green BayOntario
GRB - ONT
GRBONT
Green Bay Austin-Straubel
Sat 6/27
3:44 pm-10:51 pm
1 stop9h 07m
Ontario
Mon 6/29
5:45 am-7:11 pm
2 stops11h 26m
$645
Green BayOntario
GRB - ONT
GRBONT
Green Bay Austin-Straubel
Tue 8/4
6:52 pm-12:12 pm
2 stops19h 20m
Ontario
Fri 8/7
6:00 am-10:01 am
2 stops26h 01m
$718
Green BayOntario
GRB - ONT
GRBONT
Green Bay Austin-Straubel
Fri 6/26
5:10 am-10:40 am
1 stop7h 30m
Ontario
Sun 6/28
11:50 am-10:51 pm
1 stop9h 01m
$729
Cheapest one-way
Quickest one-way
Green BayOntario
GRB - ONT
GRBONT
Green Bay Austin-Straubel
Fri 7/17
5:10 am-10:38 am
1 stop7h 28m
$359
Green BayOntario
GRB - ONT
GRBONT
Green Bay Austin-Straubel
Fri 7/17
1:01 pm-10:34 pm
2 stops11h 33m
$364
Green BayOntario
GRB - ONT
GRBONT
Green Bay Austin-Straubel
Fri 8/7
3:44 pm-10:51 pm
1 stop9h 07m
$379
Green BayOntario
GRB - ONT
GRBONT
Green Bay Austin-Straubel
Wed 8/5
3:44 pm-10:51 pm
1 stop9h 07m
$380
Showing 1-10 of 14 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 June.
| 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 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.
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 June 21, 2026.
Get a feel of what it's like to fly with 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.
Entertainment
7.1
Food
6.6
Comfort
7.3
Boarding
7.7
Crew
8.1
Overall
7.4
Reviews
1 / 20
10.0
ExcellentAnonymous,Sep 2025
FRA - SFO
Entertainment
7.1
Food
6.6
Comfort
7.3
Boarding
7.7
Crew
8.1
Overall
7.4
Reviews
1 / 20
10.0
ExcellentAnonymous,Sep 2025
FRA - SFO
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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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 June 21, 2026.
Green Bay and Ontario flights
Browse other Green Bay and Ontario flight options. Last updated on June 21, 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 June 21, 2026.
Popular flight searches
Check out other popular destinations found by fellow travelers in 2026
Top airline flying from Green Bay to Ontario
Discover the top airline 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 2,558,603 searches. Data last updated June 21, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$288 | Average$380 | FlexibilityNo cancel fee | On-time69% |