$271+ 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 7/11. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — GRB
Jun 18 — Jun 251
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
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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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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 May 19, 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 May 19, 2026.
This Delta deal was found by Cheapflights users on 5/13. 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.
Tue 9/1512:00 pm
ONT
- GRB
1 stop7h 58m
Delta
Tue 9/225:30 am
GRB
- ONT
1 stop7h 34m
Delta
Deal found 5/13![Delta logo]()
$335
This Delta deal was found by Cheapflights users on 5/14. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/2412:00 pm
ONT
- GRB
1 stop7h 58m
Delta
Tue 10/610:50 am
GRB
- ONT
2 stops9h 28m
Delta
Deal found 5/14![Delta logo]()
$347
This Delta deal was found by Cheapflights users on 5/17. 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.
Wed 10/1412:00 pm
ONT
- GRB
1 stop7h 57m
Delta
Wed 10/215:30 am
GRB
- ONT
1 stop7h 57m
Delta
Deal found 5/17![Delta logo]()
$367
This American Airlines deal was found by Cheapflights users on 5/15. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/1511:59 pm
ONT
- GRB
2 stops12h 14m
American Airlines
Tue 9/229:55 am
GRB
- ONT
2 stops11h 02m
American Airlines
Deal found 5/15![American Airlines logo]()
$378
This Delta deal was found by Cheapflights users on 5/17. 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.
Tue 10/1312:00 pm
ONT
- GRB
1 stop7h 57m
Delta
Tue 10/205:30 am
GRB
- ONT
1 stop7h 57m
Delta
Deal found 5/17![Delta logo]()
$399
This Delta deal was found by Cheapflights users on 5/17. 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 6/2011:50 am
ONT
- GRB
1 stop9h 01m
Delta
Sat 7/46:55 am
GRB
- ONT
2 stops13h 35m
Delta
Deal found 5/17![Delta logo]()
$402
This Delta deal was found by Cheapflights users on 5/17. 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.
Wed 10/1412:00 pm
ONT
- GRB
1 stop7h 57m
Delta
Thu 10/225:30 am
GRB
- ONT
1 stop7h 57m
Delta
Deal found 5/17![Delta logo]()
$407
This Delta deal was found by Cheapflights users on 5/15. 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.
Sat 5/3012:07 pm
ONT
- GRB
1 stop8h 45m
Delta
Wed 6/35:20 am
GRB
- ONT
1 stop7h 37m
Delta
Deal found 5/15![Delta logo]()
$419
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 May 19, 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 May 19, 2026.
This Delta deal was found by Cheapflights users on 5/13. 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.
Tue 9/1510:59 pm
ONT
- GRB
2 stops14h 33m
Delta
Tue 9/2211:53 am
GRB
- ONT
2 stops12h 03m
Delta
Deal found 5/13![Delta logo]()
$345
This United Airlines deal was found by Cheapflights users on 5/17. 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 8/157:00 am
ONT
- GRB
1 stop8h 52m
United Airlines
Sat 8/2212:55 pm
GRB
- ONT
1 stop9h 02m
United Airlines
Deal found 5/17![United Airlines logo]()
$537
This Delta deal was found by Cheapflights users on 5/18. 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.
Thu 9/2412:00 pm
ONT
- GRB
1 stop7h 58m
Delta
Tue 10/67:00 am
GRB
- ONT
2 stops13h 18m
Delta
Deal found 5/18![Delta logo]()
$347
This United Airlines deal was found by Cheapflights users on 5/14. 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.
Sat 6/206:05 am
ONT
- GRB
1 stop8h 46m
United Airlines
Sat 7/43:44 pm
GRB
- ONT
1 stop9h 07m
United Airlines
Deal found 5/14![United Airlines logo]()
$554
This Delta deal was found by Cheapflights users on 5/16. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/256:00 am
ONT
- GRB
2 stops7h 54m
Delta
Sat 10/315:30 am
GRB
- ONT
1 stop7h 57m
Delta
Deal found 5/16![Delta logo]()
$608
This United Airlines deal was found by Cheapflights users on 5/16. 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.
Thu 9/246:00 am
ONT
- GRB
3 stops15h 19m
United Airlines
Tue 10/610:45 am
GRB
- ONT
2 stops11h 31m
United Airlines
Deal found 5/16![United Airlines logo]()
$701
This United Airlines deal was found by Cheapflights users on 5/16. 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 10/175:00 am
ONT
- GRB
2 stops12h 05m
United Airlines
Mon 10/195:00 am
GRB
- ONT
1 stop19h 26m
United Airlines
Deal found 5/16![United Airlines logo]()
$727
Last-minute flights from Ontario to Green BayDiscover last-minute flight deals from Ontario to Green Bay. Data last updated May 19, 2026 and is based on user searches.
Discover last-minute flight deals from Ontario to Green Bay. Data last updated May 19, 2026 and is based on user searches.
This United Airlines deal was found by Cheapflights users on 5/18. 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 5/236:30 am
ONT
- GRB
1 stop6h 39m
United Airlines
Tue 5/265:26 pm
GRB
- ONT
1 stop7h 25m
United Airlines
Deal found 5/18![United Airlines logo]()
$527
This American Airlines deal was found by Cheapflights users on 5/18. 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.
Wed 5/2710:22 am
ONT
- GRB
2 stops11h 31m
American Airlines
Mon 6/112:15 pm
GRB
- ONT
2 stops9h 41m
American Airlines
Deal found 5/18![American Airlines logo]()
$521
This Delta deal was found by Cheapflights users on 5/15. 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.
Sat 5/3012:07 pm
ONT
- GRB
1 stop8h 45m
Delta
Wed 6/35:20 am
GRB
- ONT
1 stop7h 37m
Delta
Deal found 5/15![Delta logo]()
$419
This Delta deal was found by Cheapflights users on 5/17. 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 6/2011:50 am
ONT
- GRB
1 stop9h 01m
Delta
Sat 7/46:55 am
GRB
- ONT
2 stops13h 35m
Delta
Deal found 5/17![Delta logo]()
$402
This American Airlines deal was found by Cheapflights users on 5/14. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 6/2011:59 pm
ONT
- GRB
2 stops10h 30m
American Airlines
Sat 7/46:08 am
GRB
- ONT
2 stops9h 12m
American Airlines
Deal found 5/14![American Airlines logo]()
$450
This United Airlines deal was found by Cheapflights users on 5/14. 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.
Sat 6/206:05 am
ONT
- GRB
1 stop8h 46m
United Airlines
Sat 7/43:44 pm
GRB
- ONT
1 stop9h 07m
United Airlines
Deal found 5/14![United Airlines logo]()
$554
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 May 19, 2026.
Search for one-way flight options from Ontario to Green Bay. Find affordable one-way fares based on user searches. Data last updated May 19, 2026.
This Delta deal was found by Cheapflights users on 5/14. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 7/1112:00 pm
ONT
- GRB
1 stop8h 48m
Delta
Deal found 5/14![Delta logo]()
$271
This American Airlines deal was found by Cheapflights users on 5/14. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 7/1111:59 pm
ONT
- GRB
2 stops10h 32m
American Airlines
Deal found 5/14![American Airlines logo]()
$276
This United Airlines deal was found by Cheapflights users on 5/18. 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 10/177:00 am
ONT
- GRB
1 stop7h 43m
United Airlines
Deal found 5/18![United Airlines logo]()
$321
This Delta deal was found by Cheapflights users on 5/17. 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.
Sun 10/412:00 pm
ONT
- GRB
1 stop7h 58m
Delta
Deal found 5/17![Delta logo]()
$329
This Delta deal was found by Cheapflights users on 5/15. 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.
Fri 10/912:00 pm
ONT
- GRB
1 stop7h 57m
Delta
Deal found 5/15![Delta logo]()
$339
This United Airlines deal was found by Cheapflights users on 5/16. 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.
Tue 7/71:50 pm
ONT
- GRB
2 stops18h 11m
United Airlines
Deal found 5/16![United Airlines logo]()
$364
This Delta deal was found by Cheapflights users on 5/13. 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.
Tue 5/2612:07 pm
ONT
- GRB
1 stop8h 45m
Delta
Deal found 5/13![Delta logo]()
$431
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 May 19, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $335 (Delta) |
One-way from | $271 (Delta) |
Popular in | March |
Cheapest in | January |
Average price | $507 |
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 May 19, 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
Tue 9/15
10:59 pm-3:32 pm
2 stops14h 33m
Green Bay Austin-Straubel
Tue 9/22
11:53 am-9:56 pm
2 stops12h 03m
$345
OntarioGreen Bay
ONT - GRB
ONTGRB
Ontario
Thu 9/24
12:00 pm-9:58 pm
1 stop7h 58m
Green Bay Austin-Straubel
Tue 10/6
7:00 am-6:18 pm
2 stops13h 18m
$347
OntarioGreen Bay
ONT - GRB
ONTGRB
Ontario
Sat 8/15
7:00 am-5:52 pm
1 stop8h 52m
Green Bay Austin-Straubel
Sat 8/22
12:55 pm-7:57 pm
1 stop9h 02m
$537
OntarioGreen Bay
ONT - GRB
ONTGRB
Ontario
Sat 6/20
6:05 am-4:51 pm
1 stop8h 46m
Green Bay Austin-Straubel
Sat 7/4
3:44 pm-10:51 pm
1 stop9h 07m
$554
Quickest round-trip
OntarioGreen Bay
ONT - GRB
ONTGRB
Ontario
Sun 10/25
6:00 am-3:54 pm
2 stops7h 54m
Green Bay Austin-Straubel
Sat 10/31
5:30 am-11:27 am
1 stop7h 57m
$608
OntarioGreen Bay
ONT - GRB
ONTGRB
Ontario
Thu 9/24
6:00 am-11:19 pm
3 stops15h 19m
Green Bay Austin-Straubel
Tue 10/6
10:45 am-8:16 pm
2 stops11h 31m
$701
OntarioGreen Bay
ONT - GRB
ONTGRB
Ontario
Sat 10/17
5:00 am-7:05 pm
2 stops12h 05m
Green Bay Austin-Straubel
Mon 10/19
5:00 am-10:26 pm
1 stop19h 26m
$727
Cheapest one-way
OntarioGreen Bay
ONT - GRB
ONTGRB
Ontario
Sat 7/11
12:00 pm-10:48 pm
1 stop8h 48m
$271
Quickest one-way
OntarioGreen Bay
ONT - GRB
ONTGRB
Ontario
Sun 10/18
12:00 pm-9:57 pm
1 stop7h 57m
$299
OntarioGreen Bay
ONT - GRB
ONTGRB
Ontario
Sat 10/17
9:39 am-11:19 pm
2 stops11h 40m
$326
Showing 1-10 of 13 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 May.
| 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 May 19, 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.
Entertainment
7.1
Crew
8.1
Boarding
7.7
Comfort
7.3
Food
6.6
Overall
7.4
Reviews
1 / 20
4.0
OkayDynasty,May 2026
LAX - EWR
Entertainment
7.1
Crew
8.1
Boarding
7.7
Comfort
7.3
Food
6.6
Overall
7.4
Reviews
1 / 20
4.0
OkayDynasty,May 2026
LAX - EWR
Entertainment
7.1
Crew
8.1
Boarding
7.7
Comfort
7.3
Food
6.6
Overall
7.4
Reviews
1 / 20
4.0
OkayDynasty,May 2026
LAX - EWR
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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Alternative routes for Ontario to Green Bay
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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 May 19, 2026.
Ontario and Green Bay flights
Browse other Ontario and Green Bay flight options. Last updated on May 19, 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 May 19, 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 May 19, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$299 | Average$867 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$325 | Average$526 | FlexibilityNo cancel fee | On-time69% |