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GRB - ONT

$369 Find Cheap Flights from Green Bay to Ontario - Compare and Save

1 adult
1 adult, Economy, 0 bags

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Everything you should know

Cheapest round-trip
$379
Typical prices: $396-$589
Delta
Wed 10/31Mon 11/5
GRB - ONT • 1 stop
Cheapest one-way
$369
Typical prices: $234-$339
American Airlines
Wed 1/3
GRB - ONT • 2 stops
When to travel
September
Cheapest • 29% price drop
March
Most popular
Good to know
+1
Good to know
+1
Top layover airports
Chicago O'Hare Intl (ORD)
Cheapest • Avg $424 (round-trip)
Atlanta Hartsfield-Jackson (ATL)
Shortest trip • 8h 09m (one-way)
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Cheap Flights from Green Bay to Ontario (GRB-ONT)

 
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from Green Bay to Ontario

Sat, Oct 31 - Thu, Nov 5
Delta Logo
5:30 am - 11:06 amGRB  Green Bay Austin-Straubel-ONT Ontario
7h 36m1 stop Atlanta Hartsfield-Jackson
Delta Logo
12:16 pm - 10:17 pmONT  Ontario-GRB Green Bay Austin-Straubel
8h 01m1 stop Atlanta Hartsfield-Jackson
$379Delta
Fri, Jan 8 - Thu, Jan 14
Delta Logo
5:30 am - 11:27 amGRB  Green Bay Austin-Straubel-ONT Ontario
7h 57m1 stop Atlanta Hartsfield-Jackson
Delta Logo
12:00 pm - 10:45 pmONT  Ontario-GRB Green Bay Austin-Straubel
8h 45m1 stop Atlanta Hartsfield-Jackson
$409Delta
Sat, Nov 14 - Tue, Nov 17
United Airlines Logo
1:58 pm - 6:47 pmGRB  Green Bay Austin-Straubel-ONT Ontario
6h 49m1 stop Chicago O'Hare Intl
United Airlines Logo
7:00 am - 4:52 pmONT  Ontario-GRB Green Bay Austin-Straubel
7h 52m1 stop Chicago O'Hare Intl
$499United Airlines
Thu, Jan 7 - Sat, Jan 16
United Airlines Logo
1:25 pm - 9:40 pmGRB  Green Bay Austin-Straubel-ONT Ontario
10h 15m2 stops Chicago O'Hare Intl Houston George Bush Intcntl
United Airlines Logo
7:00 am - 4:56 pmONT  Ontario-GRB Green Bay Austin-Straubel
7h 56m1 stop Chicago O'Hare Intl
$504United Airlines
Sat, Jan 9 - Sat, Jan 16
United Airlines Logo
1:25 pm - 8:20 pmGRB  Green Bay Austin-Straubel-ONT Ontario
8h 55m2 stops Chicago O'Hare Intl Denver Intl
United Airlines Logo
7:00 am - 4:56 pmONT  Ontario-GRB Green Bay Austin-Straubel
7h 56m1 stop Chicago O'Hare Intl
$504United Airlines
Sun, Jan 10 - Sat, Jan 16
American Airlines Logo
5:23 am - 3:29 pmGRB  Green Bay Austin-Straubel-ONT Ontario
12h 06m2 stops Chicago O'Hare Intl Phoenix Sky Harbor Intl
American Airlines Logo
6:20 am - 7:39 pmONT  Ontario-GRB Green Bay Austin-Straubel
11h 19m2 stops Phoenix Sky Harbor Intl Chicago O'Hare Intl
$509American Airlines
Tue, Jan 5 - Tue, Jan 12
American Airlines Logo
5:30 am - 1:30 pmGRB  Green Bay Austin-Straubel-ONT Ontario
10h 00m2 stops Chicago O'Hare Intl Dallas/Fort Worth
American Airlines Logo
6:20 am - 7:39 pmONT  Ontario-GRB Green Bay Austin-Straubel
11h 19m2 stops Phoenix Sky Harbor Intl Chicago O'Hare Intl
$515American Airlines
Tue, Jan 5 - Tue, Jan 12
American Airlines Logo
5:30 am - 11:59 pmGRB  Green Bay Austin-Straubel-ONT Ontario
20h 29m1 stop Chicago O'Hare Intl
American Airlines Logo
6:26 am - 9:19 amONT  Ontario-GRB Green Bay Austin-Straubel
24h 53m1 stop Chicago O'Hare Intl
$567American Airlines
Fri, Nov 6 - Wed, Nov 11
Delta Logo
5:30 am - 11:06 amGRB  Green Bay Austin-Straubel-ONT Ontario
7h 36m1 stop Atlanta Hartsfield-Jackson
Delta Logo
12:18 pm - 10:29 pmONT  Ontario-GRB Green Bay Austin-Straubel
8h 11m1 stop Atlanta Hartsfield-Jackson
$626Delta
Fri, Nov 6 - Wed, Nov 11
Delta Logo
5:30 am - 11:06 amGRB  Green Bay Austin-Straubel-ONT Ontario
7h 36m1 stop Atlanta Hartsfield-Jackson
Delta Logo
6:00 am - 4:19 pmONT  Ontario-GRB Green Bay Austin-Straubel
8h 19m2 stops Salt Lake City Minneapolis St Paul
$631Delta
Booking Insights

Price, demand and travel trends for Green Bay to Ontario flights

Use KAYAK data on prices, travel dates, airlines and seasonal trends to compare options and book flights with more confidence.

How much is a round-trip flight from Green Bay to Ontario?

Round-trip flights from Green Bay to Ontario typically range from $396 to $589. The lowest price found in the past 5 days was $379, on Delta.

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Key details for Green Bay to Ontario flights

Low season

January

Cheapest flight

$369
The most popular month to fly with an average 23% increase in travelers.
One-way 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

Your Green Bay to Ontario flight questions, answered

Find helpful answers about this route, including flight times, airports, airlines and booking tips.

  • What cabin classes can I book on flights from Green Bay to Ontario?

    Only Economy Class is available on flights from Green Bay to Ontario.

  • How long is a flight from Green Bay to Ontario?

    There are currently no nonstop flights available from Green Bay to Ontario. Flights with 1 layover take between 6h 57m and 8h 09m in total, depending on the connection.

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

    No, a passport is not required for this domestic route, but you will need a real ID-compliant driver's license, a state ID or another TSA-accepted form of identification.

  • How much should I expect to pay for a Green Bay to Ontario flight?

    Round-trip flights from Green Bay to Ontario range from $396 to $589, with an average of $479 over the past 12 months. Anything below $396 counts as a good deal.

  • Have flight prices from Green Bay to Ontario changed much recently?

    Yes. Based on fares seen in the past 5 days, round-trip prices on this route showed a wide range, from about $379 to $2,345. That means the highest observed fare was about 6x higher than the lowest one.

  • How are flight prices from Green Bay to Ontario looking right now?

    One-way fares from Green Bay to Ontario are currently higher than usual. Average one-way flight prices are about $537, which is 108% above the typical average for this route.

  • What car rental options are available at Ontario Airport (ONT)?

    Ontario Airport (ONT) hosts 5 major car rental companies, with daily rates starting from around $18 for economy cars. Top options include:

    • Fox
    • Thrifty
    • Europcar
    • Dollar
    • Alamo

  • Which airports can I use when flying from Green Bay to Ontario?

    Flights from Green Bay to Ontario usually depart from Green Bay Austin-Straubel (GRB) and arrive at Ontario (ONT).

  • Which airports do connecting flights from Green Bay to Ontario pass through?

    Connecting flights from Green Bay to Ontario most commonly pass through:

    • Chicago O'Hare Intl (ORD) - 54% of one-stop connections
    • Atlanta Hartsfield-Jackson (ATL) - 46% of one-stop connections

  • Can I save money by using flexible dates for flights from Green Bay to Ontario?

    Yes. Flexible dates can save you up to 55% on flights from Green Bay to Ontario. Thursday is the cheapest departure day at $338 round-trip on average, while Monday is the most expensive at $744, a difference of $406.

    KAYAK's flexible dates feature shows options up to 3 days before and after your selected dates, making it easier to compare nearby fares.

  • How much time can I save by choosing a different layover airport from Green Bay to Ontario?

    Flying via Chicago O'Hare Intl (ORD) gives the shortest average 1-stop total travel time at 6h 57m, compared with 8h 09m via Atlanta Hartsfield-Jackson (ATL).

  • What is the time difference between Green Bay and Ontario?

    Ontario is 2 hours behind Green Bay (Pacific Time vs Central Time). Plan for the time shift when scheduling connections or first-day activities.

  • What popular places can I visit in Ontario?

    Some of the most popular sights in Ontario are Ontario Convention Center and Cucamonga-Guasti Regional Park. These are among the most viewed places in Ontario on KAYAK.

Your guide to booking Green Bay to Ontario flights

Get tips on when to book, when to fly and what to know before your trip.
  • If your dates are flexible, aim for a Thursday departure and avoid flying on Monday. On this route, Thursday flights average $338, about $406 less than Monday fares (55% savings) based on the last 12 months.
  • If you can choose when to travel, plan your Green Bay to Ontario trip for September. Fares historically average $338 round-trip in that month - typically $523 less than the most expensive month, which is June (based on the last 12 months).
  • If you're arriving late at night and need somewhere to stay, check out these hotels close to Ontario Airport.

    • Azure Hotel & Suites, Trademark Collection by Wyndham
    • La Quinta Inn & Suites by Wyndham Ontario Airport
    • Ontario Airport Inn

More options for your flight from Green Bay to Ontario

Complete your trip to Ontario with a hotel stay or car rental

Car rentals in Ontario
Hotels in Ontario
Vacations in Ontario