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Flights from Atlanta to Ontario

Book direct flights from Atlanta to Ontario: One way flights from $348, round trip flights from $343. Find flight deals for the next 3 months below.

      • Cheapest nonstop
        ATL 8:10 PM
        4h 38m
        Nonstop
        ONT 9:48 PM
        Atlanta - Ontario | Thu, May 7 | Delta Air Lines
        ONT 10:55 PM
        4h 20m
        Nonstop
        ATL 6:15 AM
        Ontario - Atlanta | Mon, May 11 | Delta Air Lines
        $343 $385
        11% off
        11% off
        $385 $343
      • ATL 4:59 PM
        4h 37m
        Nonstop
        ONT 6:36 PM
        Atlanta - Ontario | Sat, May 9 | Delta Air Lines
        ONT 5:15 PM
        4h 19m
        Nonstop
        ATL 12:34 AM
        Ontario - Atlanta | Thu, May 14 | Delta Air Lines
        $346 $385
        10% off
        10% off
        $385 $346
      • ATL 8:50 PM
        24h 46m
        1 stop
        ONT 6:36 PM
        Atlanta - Ontario | Fri, Mar 27 | Frontier Airlines
        ONT 10:50 AM
        16h 48m
        1 stop
        ATL 6:38 AM
        Ontario - Atlanta | Thu, Apr 2 | Frontier Airlines
        $138 $385
        64% off
        64% off
        $385 $138
      • ATL 10:30 AM
        8h 24m
        1 stop
        ONT 3:54 PM
        Atlanta - Ontario | Tue, Mar 24 | Frontier Airlines
        ONT 6:00 AM
        10h 47m
        1 stop
        ATL 7:47 PM
        Ontario - Atlanta | Wed, Apr 1 | Frontier Airlines
        $146
        62% off
        $385 $146
      • ATL 12:00 PM
        9h 49m
        1 stop
        ONT 6:49 PM
        Atlanta - Ontario | Tue, Apr 28 | Frontier Airlines
        ONT 12:08 PM
        16h
        1 stop
        ATL 7:08 AM
        Ontario - Atlanta | Tue, May 5 | Frontier Airlines
        $151
        61% off
        $385 $151
      • ATL 8:51 PM
        13h 40m
        1 stop
        ONT 7:31 AM
        Atlanta - Ontario | Wed, Apr 29 | Frontier Airlines
        ONT 6:15 AM
        19h 56m
        1 stop
        ATL 5:11 AM
        Ontario - Atlanta | Sat, May 2 | Frontier Airlines
        $158
        59% off
        $385 $158
      • ATL 9:08 PM
        16h 36m
        1 stop
        ONT 10:44 AM
        Atlanta - Ontario | Mon, Apr 13 | Frontier Airlines
        ONT 8:01 PM
        7h 39m
        1 stop
        ATL 6:40 AM
        Ontario - Atlanta | Mon, Apr 20 | Frontier Airlines
        $165
        56% off
        $385 $165
      • ATL 8:50 PM
        26h 14m
        1 stop
        ONT 8:04 PM
        Atlanta - Ontario | Sun, May 3 | Frontier Airlines
        ONT 12:59 AM
        14h 23m
        1 stop
        ATL 6:22 PM
        Ontario - Atlanta | Sat, May 9 | Frontier Airlines
        $166
        56% off
        $385 $166
      • ATL 6:00 AM
        12h 46m
        1 stop
        ONT 3:46 PM
        Atlanta - Ontario | Sat, Apr 4 | Frontier Airlines
        ONT 6:00 AM
        12h 43m
        1 stop
        ATL 9:43 PM
        Ontario - Atlanta | Sat, Apr 11 | Frontier Airlines
        $166
        56% off
        $385 $166
      • ATL 8:50 PM
        19h 38m
        1 stop
        ONT 1:28 PM
        Atlanta - Ontario | Tue, Mar 17 | Frontier Airlines
        ONT 10:07 PM
        4h 23m
        Nonstop
        ATL 5:30 AM
        Ontario - Atlanta | Wed, Mar 18 | Frontier Airlines
        $168
        56% off
        $385 $168
      • ATL 6:00 AM
        13h 23m
        1 stop
        ONT 4:23 PM
        Atlanta - Ontario | Tue, Apr 7 | Frontier Airlines
        ONT 10:41 PM
        21h 53m
        1 stop
        ATL 11:34 PM
        Ontario - Atlanta | Thu, Apr 9 | Frontier Airlines
        $168
        56% off
        $385 $168
      • ATL 12:00 PM
        9h 49m
        1 stop
        ONT 6:49 PM
        Atlanta - Ontario | Wed, Apr 15 | Frontier Airlines
        ONT 5:30 AM
        7h 5m
        1 stop
        ATL 3:35 PM
        Ontario - Atlanta | Wed, Apr 22 | Spirit Airlines
        $173
        55% off
        $385 $173
      • ATL 1:00 PM
        17h 25m
        1 stop
        ONT Invalid Date
        Atlanta - Ontario | Wed, Mar 18 | Normal Airline
        ONT 3:00 PM
        6h
        Nonstop
        ATL 4:00 PM
        Ontario - Atlanta | Fri, Mar 20 | Normal Airline
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      • Cheapest nonstop
        ATL 7:20 PM
        4h 40m
        Nonstop
        ONT 9:00 PM
        Atlanta - Ontario | Sun, Apr 26 | Delta Air Lines
        $348 $387
        10% off
        10% off
        $387 $348
      • ATL 4:59 PM
        4h 37m
        Nonstop
        ONT 6:36 PM
        Atlanta - Ontario | Sat, May 9 | Delta Air Lines
        $348 $387
        10% off
        10% off
        $387 $348
      • ATL 10:30 AM
        16h 25m
        1 stop
        ONT 11:55 PM
        Atlanta - Ontario | Tue, Apr 14 | Frontier Airlines
        $56 $387
        86% off
        86% off
        $387 $56
      • ATL 6:00 AM
        13h 23m
        1 stop
        ONT 4:23 PM
        Atlanta - Ontario | Wed, Apr 8 | Frontier Airlines
        $58
        85% off
        $387 $58
      • ATL 10:30 AM
        16h 25m
        1 stop
        ONT 11:55 PM
        Atlanta - Ontario | Wed, May 6 | Frontier Airlines
        $61
        84% off
        $387 $61
      • ATL 10:30 AM
        16h 25m
        1 stop
        ONT 11:55 PM
        Atlanta - Ontario | Tue, Apr 28 | Frontier Airlines
        $61
        84% off
        $387 $61
      • ATL 10:30 AM
        16h 25m
        1 stop
        ONT 11:55 PM
        Atlanta - Ontario | Wed, Apr 15 | Frontier Airlines
        $62
        84% off
        $387 $62
      • ATL 10:30 AM
        16h 29m
        1 stop
        ONT 11:59 PM
        Atlanta - Ontario | Tue, Mar 24 | Frontier Airlines
        $65
        83% off
        $387 $65
      • ATL 10:30 AM
        16h 25m
        1 stop
        ONT 11:55 PM
        Atlanta - Ontario | Wed, May 13 | Frontier Airlines
        $65
        83% off
        $387 $65
      • ATL 10:30 AM
        16h 25m
        1 stop
        ONT 11:55 PM
        Atlanta - Ontario | Wed, Apr 29 | Frontier Airlines
        $65
        83% off
        $387 $65
      • ATL 9:21 PM
        29h 35m
        1 stop
        ONT 11:56 PM
        Atlanta - Ontario | Tue, Apr 7 | Frontier Airlines
        $66
        83% off
        $387 $66
      • ATL 10:30 AM
        16h 25m
        1 stop
        ONT 11:55 PM
        Atlanta - Ontario | Wed, Apr 22 | Frontier Airlines
        $66
        83% off
        $387 $66
      • ATL 1:00 PM
        17h 25m
        1 stop
        ONT Invalid Date
        Atlanta - Ontario | Wed, Mar 18 | Normal Airline
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Displayed flight fares from Atlanta to Ontario are based on average prices across airlines for the next 3 months, according to the latest Trip.com database.

Flight Info | Atlanta to Ontario

The distance between Atlanta and Ontario is approximately 3,054.01 km. Based on Trip.com's data travel demand peaks in September. The off-season for travel is February.

Cheapest one-way flight price$56
Cheapest round-trip ticket price$138
Off-season for travelFebruary
Peak season for travelSeptember
Flight distance3,054.01 km
Flight statistics for the Atlanta–Ontario route are based on aggregated booking data from Trip.com over the past 12 months.

Frequently Asked Questions

  • What are the cheapest flights from Atlanta to Ontario (ATL-ONT)?

    Based on Trip.com data, Frontier Airlines offers one-way fares as low as $56 on Cheapest nonstop routes (e.g. ATL to ONT on Tue, Apr 14), while Frontier Airlines offers Cheapest nonstop round-trips from $138 departing on Fri, Mar 27 and returning on Thu, Apr 2.
  • By analyzing data from all airlines on the Trip.com flight calendar, it looks like the best time to book a flight from Atlanta to Ontario is around 40 days (6 weeks) in advance, and the best time to fly is usually on Tuesday, Wednesday, and Saturday. Tuesday typically offers the cheapest flights for departure, while Saturday offers the best return deals.
  • To find best deals on flights from Atlanta to Ontario, you can use various tools on Trip.com:
    · Be flexible with your travel dates to get the cheapest flight deal. Now the cheapest flight deal is on Tue, Apr 14, with one-way flights priced at just $56.
    · Compare airlines strategically. Budget carriers often provide the lowest base fares, while we found the most affordable airline currently operating on this route is Delta Air Lines.
    · Set up price alerts to easily monitor ticket prices without having to check every day.
    · Check Trip.com flight deals and promo codes frequently.
    · Avoid peak season unless you book very early. It seems the peak season for Ontario travel is around September.
    · Get exclusive promo codes for Trip.com app users.
  • The cheapest months to fly from Atlanta to Ontario is February, when demand for travel is lower.
  • After crunching the numbers on our March flight calendar, it's currently cheapest to fly from Atlanta to Ontario on March 27, 2026 with Frontier Airlines, with prices starting at $138.
  • The time difference between Ontario and Atlanta is 3h.
  • Tickets can only be changed or canceled if permitted by airline policy. To submit a change or cancellation request, go to the flight bookings page, select the option to change or cancel your booking, choose the relevant passengers and segment, and submit a request. Please note that additional charges may apply according to the airline ticket policy. However, if the flight has been rescheduled and you would like to change or cancel your ticket, you can submit an involuntary cancellation request. For more details about change and cancellation policies, please check the customer support pages.

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Note: Prices shown on this page are estimated lowest price and include all taxes and fees found in the last 24 hours.

Book with no extra fees

Prices displayed in this page are all-inclusive prices (incl. taxes, fuel surcharge, civil aviation development fund, etc) with all fees confirmed before payment. Fees for luggage, meals, WLAN, or other additional services are also included as shown in the flight cards.

Real-time pricing updates

Prices, availability, and travel information on this page were updated within last 24 hours—even in real-time. The more popular the route, the more precise the data.

Change & Cancellation Policy

Trip.com displays flight cancellation and change policies for each flight ticket during the booking process, including fees and applicable conditions. Please check the following scenarios:
Voluntary cancellation/change:
To submit a change or cancellation request, go to the flight bookings page, select the option to change or cancel your booking, choose the relevant passengers and segment, and submit a request. Please note that additional charges may apply according to the airline ticket policy.
Cancellation/change due to a flight schedule change:
If the flight has been rescheduled and you would like to change or cancel your ticket, you can submit an involuntary cancellation request. For more details about change and cancellation policies, please check the customer support pages.