GRB - ONT

$299 Find Cheap Flights from Green Bay to Ontario

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Green Bay to Ontario departing on 6/2. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult
1 adult, Economy, 0 bags

KAYAK searches hundreds of travel sites at once for deals on flights to Ontario

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Green Bay to Ontario, as well as popular online travel agencies
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Green Bay to Ontario, as well as popular online travel agencies
Travelers love KAYAK
41,299,237 searches in the past 7 days on KAYAK

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Everything you should know

Cheapest round-trip
$335
Typical prices: $413-$412
United Airlines
Tue 4/28Sat 5/2
GRB - ONT • 1 stop
Cheapest one-way
$299
United Airlines
Tue 6/2
GRB - ONT • 1 stop
Top airlines
United Airlines
Cheapest • from $335 (round-trip)
United Airlines
Best reviews • 7.4 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
Nonstop flights
Not available
There are currently no direct flights between Green Bay and Ontario. You'll need at least 1 connection.
Insights
Insights
Insights
Insights
Top layover airports
Chicago (ORD)
Cheapest • Avg $350 (round-trip)
Chicago (ORD)
Shortest trip • 7h 31m (one-way)
Insights
Insights
Insights
Insights
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KAYAK searches 100s of sites at once to find you the best travel deals.
We hope you love your trip to Ontario!
Flight Deals
Booking Insights
Flight Deals

Cheap Flights from Green Bay to Ontario (GRB-ONT)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Green Bay to Ontario that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from Green Bay to Ontario

Tue, Apr 28 - Sat, May 2
United Airlines Logo
3:47 pm - 10:31 pm
GRB
-
ONT
8h 44m
1 stop
United Airlines Logo
7:00 am - 4:50 pm
ONT
-
GRB
7h 50m
1 stop
$335United Airlines
Tue, Apr 28 - Sat, May 2
United Airlines Logo
5:00 am - 12:38 pm
GRB
-
ONT
9h 38m
2 stops
United Airlines Logo
7:00 am - 4:50 pm
ONT
-
GRB
7h 50m
1 stop
$340United Airlines
Tue, Apr 28 - Sat, May 2
United Airlines Logo
1:30 pm - 8:36 pm
GRB
-
ONT
9h 06m
2 stops
United Airlines Logo
10:43 am - 10:58 pm
ONT
-
GRB
10h 15m
2 stops
$345United Airlines
Tue, Apr 14 - Mon, Apr 20
American Airlines Logo
9:42 am - 6:24 pm
GRB
-
ONT
10h 42m
2 stops
American Airlines Logo
7:35 pm - 9:12 am
ONT
-
GRB
11h 37m
2 stops
$404American Airlines
Tue, Apr 14 - Sat, Apr 18
United Airlines Logo
5:40 pm - 10:31 pm
GRB
-
ONT
6h 51m
1 stop
United Airlines Logo
7:00 am - 3:12 pm
ONT
-
GRB
6h 12m
1 stop
$419United Airlines
Tue, Apr 14 - Sat, Apr 18
United Airlines Logo
1:30 pm - 9:50 pm
GRB
-
ONT
10h 20m
2 stops
United Airlines Logo
7:00 am - 3:12 pm
ONT
-
GRB
6h 12m
1 stop
$424United Airlines
Tue, Apr 14 - Sat, Apr 18
United Airlines Logo
5:00 am - 12:38 pm
GRB
-
ONT
9h 38m
2 stops
United Airlines Logo
6:05 am - 7:13 pm
ONT
-
GRB
11h 08m
2 stops
$429United Airlines
Sat, May 9 - Tue, May 12
United Airlines Logo
10:40 am - 6:01 pm
GRB
-
ONT
9h 21m
1 stop
United Airlines Logo
7:00 am - 4:50 pm
ONT
-
GRB
7h 50m
1 stop
$435United Airlines
Sat, May 9 - Tue, May 12
United Airlines Logo
5:00 am - 5:52 pm
GRB
-
ONT
14h 52m
2 stops
United Airlines Logo
7:00 am - 3:10 pm
ONT
-
GRB
6h 10m
1 stop
$440United Airlines
Sat, May 9 - Tue, May 12
United Airlines Logo
5:00 am - 12:38 pm
GRB
-
ONT
9h 38m
2 stops
United Airlines Logo
6:59 pm - 10:00 am
ONT
-
GRB
13h 01m
2 stops
$445United Airlines
Booking Insights

KAYAK's insights & trends for Green Bay to Ontario flights

Get data-powered insights and trends into flights from Green Bay to Ontario to help you find the cheapest flights, the best time to fly and much more.

Which airlines provide the cheapest flights from Green Bay to Ontario?

The cheapest round-trip price for the route for each airline clicked by KAYAK users in the last 72 hours.

In the past 3 days, the cheapest round-trip tickets from Green Bay to Ontario were found on United Airlines ($335) and American Airlines ($404).

Find deals

Good to know

Low seasonMay
Cheapest flight$299
Best time to beat the crowds with an average 27% drop in price.
Most popular time to fly with an average 3% increase in price.
Flight from Green Bay to Ontario

When to book flights from Green Bay to Ontario

Are your dates flexible? Find out the best times to travel from Green Bay to Ontario based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated round-trip price
KAYAK looks at all historical flight data for each date to provide a predicted price for one-way trips or round-trips with a duration up to 40 days. While we try to provide actual minimum prices for each date, some prices are predictions and actual prices may differ.

FAQs for booking flights from Green Bay to Ontario

  • What is the cheapest flight from Green Bay to Ontario?

    In the last 3 days, the lowest price for a flight from Green Bay to Ontario was $299 for a one-way ticket and $335 for a round-trip.

  • Do I need a passport to fly between Green Bay and Ontario?

    No

  • Which aircraft models fly most regularly from Green Bay to Ontario?

    We unfortunately don’t have that data for this specific route.

  • Which airline alliances offer flights from Green Bay to Ontario?

    Star Alliance is the only airline alliance operating flights between Green Bay and Ontario.

  • How does KAYAK find such low prices on flights from Green Bay to Ontario?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Green Bay to Ontario.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Green Bay to Ontario?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Ontario from Green Bay is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights from Green Bay to Ontario?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to Ontario with an airline and back to Green Bay with another airline. Booking your flights between Green Bay and ONT can sometimes prove cheaper using this method.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Green Bay to Ontario?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to Ontario from Green Bay up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Reviews of the top airline flying from Green Bay to Ontario

 
See real verified KAYAK customer reviews for airlines flying from Green Bay to Ontario. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with from Green Bay to Ontario? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
7.4
United AirlinesOverall score based on 9525 reviews
7.7Boarding
8.1Crew
6.6Food
7.3Comfort
7.1Entertainment
Airline reviews

Terrible, if possible won't be flying again anytime soon!

2.0 MediocreTimothy, Mar 2026
ORD - LAX
Read more United Airlines reviews

Terrible, if possible won't be flying again anytime soon!

Wonderful in-seat entertainment with seatback screens and huge selection of quality movies. The ability to bluetooth connect headphones was amazing.

Horrible service no Wi-Fi connection on both leg of the flight and they are refusing to fix bad service

I will never fly ANA again. They lost one of my large pieces of checked luggage, the heaviest one with the most valuable items in it, and they said they will not send me an email unless they can't find it, even though the paper they gave me to track the status of my lost luggage requires a code from an email they are supposed to send me so I can do baggage tracing. They claim to be an international airline, but they also insist on calling a Japanese telephone number to confirm where to send the lost baggage if they find it. It is impossible to find an actual contact email address for customer support on their website, and their AI chatbot is unhelpful, directing you to a webpage that says it is for contact information but does not have any actual email addresses or phone numbers listed on it. My seat in economy did not recline at all, even though I was not sitting in an exit row nor the very back row. I had to sit in the fully upright position for over ten hours of international travel. Awful experience overall.

Flight delayed for more than 16 hrs and no effort was spent to provide an alternate

Overall we had a good experience during our flight from San Francisco to Houston.

it was a very short flight so my expectations were low.

Very disappointing given gate agent behavior. Filed a formal complaint with United.

Flight delayed. WiFi connectivity very poor if not existant. Last minute arrival forced me to run to catch my connection.

The power at the seat didn't work and the seat itself was difficult to adjust - this was a business class seat. Flight attendant gave me miles to compensate. The attendant was very professional and on top of his game the entire flight.

Everything you need to know for your flight from Green Bay to Ontario

Information on your arrival and departure airports

Green Bay (GRB)
Ontario (ONT)