$262+ 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 9/12. Fares are subject to change and may not be available on all flights or dates of travel.
GRB — ONT
Sep 3 — Sep 101
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
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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 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 August 4, 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 August 4, 2026.
This Delta deal was found by Cheapflights users on 8/3. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/65:30 am -
1 stop7h 12m
Tue 9/1512:17 pm -
1 stop8h 07m
Deal found 8/3![Delta logo]()
$386
This Delta deal was found by Cheapflights users on 8/4. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/195:24 am -
1 stop7h 18m
Tue 8/2512:00 pm -
1 stop8h 34m
Deal found 8/4![Delta logo]()
$394
This United Airlines deal was found by Cheapflights users on 8/3. 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 8/199:14 am -
2 stops11h 02m
Tue 8/259:01 am -
2 stops12h 18m
Deal found 8/3![United Airlines logo]()
$406
This United Airlines deal was found by Cheapflights users on 8/1. 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 8/185:29 pm -
1 stop7h 06m
Tue 8/259:01 am -
2 stops12h 18m
Deal found 8/1![United Airlines logo]()
$499
This United Airlines deal was found by Cheapflights users on 7/31. 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.
Sat 12/51:11 pm -
1 stop7h 33m
Wed 12/96:53 pm -
2 stops13h 37m
Deal found 7/31![United Airlines logo]()
$544
This United Airlines deal was found by Cheapflights users on 8/4. 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 10/231:17 pm -
2 stops11h 34m
Mon 10/266:37 pm -
2 stops13h 25m
Deal found 8/4![United Airlines logo]()
$595
This United Airlines deal was found by Cheapflights users on 8/2. 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.
Sat 10/311:32 pm -
1 stop7h 15m
Sun 11/87:00 am -
1 stop7h 52m
Deal found 8/2![United Airlines logo]()
$639
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 August 4, 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 August 4, 2026.
This Delta deal was found by Cheapflights users on 8/4. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/194:13 pm -
2 stops9h 21m
Tue 8/2512:00 pm -
1 stop8h 34m
Deal found 8/4![Delta logo]()
$399
This United Airlines deal was found by Cheapflights users on 8/1. 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.
Wed 1/131:11 pm -
1 stop7h 33m
Sat 1/166:45 am -
1 stop7h 58m
Deal found 8/1![United Airlines logo]()
$459
This United Airlines deal was found by Cheapflights users on 8/3. 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 8/199:14 am -
2 stops12h 47m
Tue 8/259:15 am -
2 stops12h 04m
Deal found 8/3![United Airlines logo]()
$504
This United Airlines deal was found by Cheapflights users on 8/1. 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 8/189:14 am -
2 stops12h 47m
Tue 8/259:01 am -
2 stops12h 18m
Deal found 8/1![United Airlines logo]()
$580
Last-minute flights from Green Bay to OntarioDiscover last-minute flight deals from Green Bay to Ontario. Data last updated August 4, 2026 and is based on user searches.
Discover last-minute flight deals from Green Bay to Ontario. Data last updated August 4, 2026 and is based on user searches.
This United Airlines deal was found by Cheapflights users on 8/3. 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.
Sun 8/169:14 am -
2 stops12h 59m
Thu 8/209:01 am -
2 stops12h 18m
Deal found 8/3![United Airlines logo]()
$882
This United Airlines deal was found by Cheapflights users on 8/1. 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 8/185:29 pm -
1 stop7h 06m
Tue 8/259:01 am -
2 stops12h 18m
Deal found 8/1![United Airlines logo]()
$499
This Delta deal was found by Cheapflights users on 8/4. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/195:24 am -
1 stop7h 18m
Tue 8/2512:00 pm -
1 stop8h 34m
Deal found 8/4![Delta logo]()
$394
This United Airlines deal was found by Cheapflights users on 8/3. 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 8/199:14 am -
2 stops11h 02m
Tue 8/259:01 am -
2 stops12h 18m
Deal found 8/3![United Airlines logo]()
$406
This American Airlines deal was found by Cheapflights users on 8/3. 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.
Wed 8/195:55 am -
2 stops9h 36m
Tue 8/256:15 am -
3 stops10h 10m
Deal found 8/3![American Airlines logo]()
$858
This Delta deal was found by Cheapflights users on 8/3. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/65:30 am -
1 stop7h 12m
Tue 9/1512:17 pm -
1 stop8h 07m
Deal found 8/3![Delta logo]()
$386
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 August 4, 2026.
Search for one-way flight options from Green Bay to Ontario. Find affordable one-way fares based on user searches. Data last updated August 4, 2026.
This United Airlines deal was found by Cheapflights users on 8/3. 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 9/1210:32 am -
2 stops13h 27m
Deal found 8/3![United Airlines logo]()
$262
This Delta deal was found by Cheapflights users on 8/3. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/75:30 am -
1 stop7h 36m
Deal found 8/3![Delta logo]()
$277
This Delta deal was found by Cheapflights users on 8/3. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/255:30 am -
1 stop7h 36m
Deal found 8/3![Delta logo]()
$314
This United Airlines deal was found by Cheapflights users on 8/4. 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 9/35:29 pm -
1 stop7h 06m
Deal found 8/4![United Airlines logo]()
$364
This Delta deal was found by Cheapflights users on 8/1. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/175:24 am -
1 stop7h 18m
Deal found 8/1![Delta logo]()
$374
This United Airlines deal was found by Cheapflights users on 8/1. 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.
Wed 8/195:29 pm -
1 stop7h 06m
Deal found 8/1![United Airlines logo]()
$379
This United Airlines deal was found by Cheapflights users on 8/2. 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 8/1111:45 am -
2 stops10h 16m
Deal found 8/2![United Airlines logo]()
$384
This United Airlines deal was found by Cheapflights users on 7/31. 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.
Mon 8/175:29 pm -
1 stop7h 06m
Deal found 7/31![United Airlines logo]()
$410
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 August 4, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $386 (Delta) |
One-way from | $262 (United Airlines) |
Popular in | November |
Cheapest in | February |
Average price | $418 |
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 August 4, 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 - ONT
GRBONT
Green Bay Austin-Straubel
Wed 8/19
4:13 pm-11:34 pm
2 stops9h 21m
Ontario
Tue 8/25
12:00 pm-10:34 pm
1 stop8h 34m
$399
Quickest round-trip
Green BayOntario
GRB - ONT
GRBONT
Green Bay Austin-Straubel
Wed 1/13
1:11 pm-6:44 pm
1 stop7h 33m
Ontario
Sat 1/16
6:45 am-4:43 pm
1 stop7h 58m
$459
Green BayOntario
GRB - ONT
GRBONT
Green Bay Austin-Straubel
Wed 8/19
9:14 am-8:01 pm
2 stops12h 47m
Ontario
Tue 8/25
9:15 am-11:19 pm
2 stops12h 04m
$504
Green BayOntario
GRB - ONT
GRBONT
Green Bay Austin-Straubel
Tue 8/18
9:14 am-8:01 pm
2 stops12h 47m
Ontario
Tue 8/25
9:01 am-11:19 pm
2 stops12h 18m
$580
Cheapest one-way
Green BayOntario
GRB - ONT
GRBONT
Green Bay Austin-Straubel
Sat 9/12
10:32 am-9:59 pm
2 stops13h 27m
$262
Green BayOntario
GRB - ONT
GRBONT
Green Bay Austin-Straubel
Wed 10/7
5:30 am-11:06 am
1 stop7h 36m
$277
Green BayOntario
GRB - ONT
GRBONT
Green Bay Austin-Straubel
Sun 10/25
5:30 am-11:06 am
1 stop7h 36m
$314
Quickest one-way
Green BayOntario
GRB - ONT
GRBONT
Green Bay Austin-Straubel
Thu 9/3
5:29 pm-10:35 pm
1 stop7h 06m
$364
Green BayOntario
GRB - ONT
GRBONT
Green Bay Austin-Straubel
Mon 8/17
5:24 am-10:42 am
1 stop7h 18m
$374
Green BayOntario
GRB - ONT
GRBONT
Green Bay Austin-Straubel
Tue 8/11
11:45 am-8:01 pm
2 stops10h 16m
$384
Showing 1-10 of 12 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 August.
| 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 August 4, 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.
Crew
8.5
Entertainment
7.8
Overall
7.8
Boarding
8.1
Comfort
7.8
Food
7.2
Reviews
1 / 20
10.0
ExcellentAaron,Oct 2024
TUS - LAX
Crew
8.5
Entertainment
7.8
Overall
7.8
Boarding
8.1
Comfort
7.8
Food
7.2
Reviews
1 / 20
10.0
ExcellentAaron,Oct 2024
TUS - LAX
Crew
8.5
Entertainment
7.8
Overall
7.8
Boarding
8.1
Comfort
7.8
Food
7.2
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
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Other flights from Green Bay
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Alternative routes for Green Bay to Ontario
See prices for flight routes from nearby airports that may be better suited for you.
Complete your trip
Complete your trip to Ontario by adding a car rental and/or hotel reservation to your travel itinerary.
Search flights from Green Bay to Ontario by cabin class
Find flights from Green Bay to Ontario, based on your preferred cabin class, be it economy, premium economy, business, or first class.
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 August 4, 2026.
Green Bay and Ontario flights
Browse other Green Bay and Ontario flight options. Last updated on August 4, 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 August 4, 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 2,558,603 searches. Data last updated August 4, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$288 | Average$380 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$360 | Average$437 | FlexibilityNo cancel fee | On-timeN/A |