$137+ Cheap flights from Atlanta to Ontario (ATL - ONT)
This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 8/25. Fares are subject to change and may not be available on all flights or dates of travel.
ATL — ONT
Aug 20 — Aug 271
Round-trip
1 adult, Economy
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Find cheap flights from Atlanta 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
We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.3. Compare prices and book
Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.Cheapflights Tip: The best prices from Atlanta Hartsfield-Jackson to Ontario are usually found in October or January, booked 19 days in advance, depart on a Tuesday or Wednesday and return on a Wednesday
Cheap flight deals from Atlanta to Ontario
Cheapest
Best
Last-minute
One-way
Cheapest flights from Atlanta to OntarioExplore the most affordable flight options available from Atlanta to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 21, 2026.
Explore the most affordable flight options available from Atlanta to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 21, 2026.
This Kiwi.com deal was found by Cheapflights users on 7/17. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/258:30 pm
ATL
- ONT
1 stop16h 34m
Frontier
Wed 9/92:55 pm
ONT
- ATL
1 stop10h 56m
Frontier
Deal found 7/17![Frontier logo]()
$137
This Kiwi.com deal was found by Cheapflights users on 7/17. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/198:35 pm
ATL
- ONT
1 stop16h 29m
Frontier
Sat 8/226:00 am
ONT
- ATL
1 stop20h 21m
Frontier
Deal found 7/17![Frontier logo]()
$140
This Kiwi.com deal was found by Cheapflights users on 7/17. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/1012:30 pm
ATL
- ONT
1 stop14h 25m
Frontier
Mon 9/142:55 pm
ONT
- ATL
1 stop10h 56m
Frontier
Deal found 7/17![Frontier logo]()
$176
This Kiwi.com deal was found by Cheapflights users on 7/19. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/186:07 am
ATL
- ONT
1 stop15h 54m
Frontier
Mon 8/249:33 am
ONT
- ATL
1 stop20h 59m
Frontier
Deal found 7/19![Frontier logo]()
$192
This Kiwi.com deal was found by Cheapflights users on 7/20. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/37:57 am
ATL
- ONT
1 stop29h 07m
Frontier
Sun 9/66:00 am
ONT
- ATL
1 stop20h 21m
Frontier
Deal found 7/20![Frontier logo]()
$199
This Kiwi.com deal was found by Cheapflights users on 7/17. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/78:00 am
ATL
- ONT
1 stop8h 57m
Frontier
Sat 10/106:00 am
ONT
- ATL
1 stop26h 25m
Frontier
Deal found 7/17![Frontier logo]()
$206
This Kiwi.com deal was found by Cheapflights users on 7/20. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/199:00 pm
ATL
- ONT
1 stop13h 32m
Frontier
Wed 8/2610:59 am
ONT
- ATL
1 stop19h 33m
Frontier
Deal found 7/20![Frontier logo]()
$214
This Kiwi.com deal was found by Cheapflights users on 7/20. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/118:00 am
ATL
- ONT
1 stop18h 55m
Frontier
Mon 9/148:07 am
ONT
- ATL
1 stop8h 20m
Frontier
Deal found 7/20![Frontier logo]()
$215
Best flights from Atlanta to OntarioDiscover carefully curated flight deals from Atlanta to Ontario that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated July 21, 2026.
Discover carefully curated flight deals from Atlanta to Ontario that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated July 21, 2026.
This Southwest deal was found by Cheapflights users on 7/19. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/15:30 pm
ATL
- ONT
2 stops9h 25m
Southwest
Thu 10/291:05 pm
ONT
- ATL
2 stops7h 50m
Southwest
Deal found 7/19![Southwest logo]()
$369
This Delta deal was found by Cheapflights users on 7/20. 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 8/229:25 am
ATL
- ONT
Nonstop4h 17m
Delta
Sat 8/2912:00 pm
ONT
- ATL
Nonstop4h 30m
Delta
Deal found 7/20![Delta logo]()
$439
This Southwest deal was found by Cheapflights users on 7/18. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/107:40 am
ATL
- ONT
2 stops11h 20m
Southwest
Sat 10/245:45 am
ONT
- ATL
2 stops8h 15m
Southwest
Deal found 7/18![Southwest logo]()
$369
This Delta deal was found by Cheapflights users on 7/20. 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 9/116:40 pm
ATL
- ONT
Nonstop4h 25m
Delta
Mon 9/1410:00 pm
ONT
- ATL
Nonstop4h 05m
Delta
Deal found 7/20![Delta logo]()
$439
This Southwest deal was found by Cheapflights users on 7/20. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/176:10 am
ATL
- ONT
2 stops8h 15m
Southwest
Mon 8/2412:35 pm
ONT
- ATL
2 stops8h 30m
Southwest
Deal found 7/20![Southwest logo]()
$401
This Delta deal was found by Cheapflights users on 7/19. 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 8/208:27 pm
ATL
- ONT
Nonstop4h 25m
Delta
Tue 8/2511:56 am
ONT
- ATL
1 stop9h 03m
Delta
Deal found 7/19![Delta logo]()
$449
This Delta deal was found by Cheapflights users on 7/17. 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 10/79:30 am
ATL
- ONT
Nonstop4h 38m
Delta
Sat 10/1012:18 pm
ONT
- ATL
Nonstop4h 12m
Delta
Deal found 7/17![Delta logo]()
$469
This Southwest deal was found by Cheapflights users on 7/20. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/95:30 pm
ATL
- ONT
2 stops9h 25m
Southwest
Tue 10/139:15 am
ONT
- ATL
2 stops8h 30m
Southwest
Deal found 7/20![Southwest logo]()
$469
This Delta deal was found by Cheapflights users on 7/18. 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.
Mon 8/175:05 pm
ATL
- ONT
Nonstop4h 25m
Delta
Mon 8/241:06 pm
ONT
- ATL
1 stop7h 52m
Delta
Deal found 7/18![Delta logo]()
$479
This Delta deal was found by Cheapflights users on 7/16. 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.
Mon 8/105:05 pm
ATL
- ONT
Nonstop4h 25m
Delta
Thu 8/2010:00 pm
ONT
- ATL
Nonstop4h 18m
Delta
Deal found 7/16![Delta logo]()
$489
Last-minute flights from Atlanta to OntarioDiscover last-minute flight deals from Atlanta to Ontario. Data last updated July 21, 2026 and is based on user searches.
Discover last-minute flight deals from Atlanta to Ontario. Data last updated July 21, 2026 and is based on user searches.
This Trip.com deal was found by Cheapflights users on 7/18. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/811:07 am
ATL
- ONT
1 stop7h 07m
Frontier
Sat 8/159:36 am
ONT
- ATL
1 stop10h 48m
Frontier
Deal found 7/18![Frontier logo]()
$223
This Kiwi.com deal was found by Cheapflights users on 7/20. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/1110:08 am
ATL
- ONT
1 stop24h 24m
Frontier
Thu 8/138:17 am
ONT
- ATL
1 stop8h 33m
Frontier
Deal found 7/20![Frontier logo]()
$225
This Super.com deal was found by Cheapflights users on 7/18. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/1111:07 am
ATL
- ONT
1 stop7h 07m
Frontier
Wed 8/128:17 am
ONT
- ATL
1 stop8h 33m
Frontier
Deal found 7/18![Frontier logo]()
$237
This Kiwi.com deal was found by Cheapflights users on 7/20. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/1711:07 am
ATL
- ONT
1 stop7h 47m
Frontier
Mon 8/249:33 am
ONT
- ATL
1 stop20h 59m
Frontier
Deal found 7/20![Frontier logo]()
$224
This Kiwi.com deal was found by Cheapflights users on 7/19. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/186:07 am
ATL
- ONT
1 stop15h 54m
Frontier
Mon 8/249:33 am
ONT
- ATL
1 stop20h 59m
Frontier
Deal found 7/19![Frontier logo]()
$192
This Kiwi.com deal was found by Cheapflights users on 7/17. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/198:35 pm
ATL
- ONT
1 stop16h 29m
Frontier
Sat 8/226:00 am
ONT
- ATL
1 stop20h 21m
Frontier
Deal found 7/17![Frontier logo]()
$140
This Kiwi.com deal was found by Cheapflights users on 7/20. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/199:00 pm
ATL
- ONT
1 stop13h 32m
Frontier
Wed 8/2610:59 am
ONT
- ATL
1 stop19h 33m
Frontier
Deal found 7/20![Frontier logo]()
$214
This Kiwi.com deal was found by Cheapflights users on 7/17. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/258:30 pm
ATL
- ONT
1 stop16h 34m
Frontier
Wed 9/92:55 pm
ONT
- ATL
1 stop10h 56m
Frontier
Deal found 7/17![Frontier logo]()
$137
One-way flights from Atlanta to OntarioSearch for one-way flight options from Atlanta to Ontario. Find affordable one-way fares based on user searches. Data last updated July 21, 2026.
Search for one-way flight options from Atlanta to Ontario. Find affordable one-way fares based on user searches. Data last updated July 21, 2026.
This Cheapflightsfares deal was found by Cheapflights users on 7/19. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/188:47 pm
ATL
- ONT
1 stop21h 00m
Frontier
Deal found 7/19![Frontier logo]()
$154
This Frontier deal was found by Cheapflights users on 7/19. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/206:15 am
ATL
- ONT
1 stop11h 22m
Frontier
Deal found 7/19![Frontier logo]()
$156
This Kiwi.com deal was found by Cheapflights users on 7/17. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/207:57 am
ATL
- ONT
2 stops11h 25m
Frontier
Deal found 7/17![Frontier logo]()
$157
This Kiwi.com deal was found by Cheapflights users on 7/19. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/198:30 pm
ATL
- ONT
2 stops17h 13m
Frontier
Deal found 7/19![Frontier logo]()
$158
This Kiwi.com deal was found by Cheapflights users on 7/18. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/135:05 am
ATL
- ONT
2 stops13h 49m
Frontier
Deal found 7/18![Frontier logo]()
$159
This Kiwi.com deal was found by Cheapflights users on 7/19. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/155:30 am
ATL
- ONT
2 stops12h 17m
Frontier
Deal found 7/19![Frontier logo]()
$160
This Trip.com deal was found by Cheapflights users on 7/17. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/97:40 am
ATL
- ONT
1 stop29h 24m
Frontier
Deal found 7/17![Frontier logo]()
$161
This Kiwi.com deal was found by Cheapflights users on 7/16. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/3010:06 am
ATL
- ONT
2 stops16h 49m
Frontier
Deal found 7/16![Frontier logo]()
$162
This Kiwi.com deal was found by Cheapflights users on 7/18. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/155:01 am
ATL
- ONT
2 stops13h 13m
Frontier
Deal found 7/18![Frontier logo]()
$163
This Kiwi.com deal was found by Cheapflights users on 7/17. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/168:30 pm
ATL
- ONT
2 stops46h 24m
Frontier
Deal found 7/17![Frontier logo]()
$164
This Kiwi.com deal was found by Cheapflights users on 7/16. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/178:00 am
ATL
- ONT
2 stops11h 10m
Frontier
Deal found 7/16![Frontier logo]()
$165
Find flight deals from Atlanta to Ontario
Discover tips and strategies to find the most affordable flight options for your journey from Atlanta (ATL) 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 July 21, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $137 (Kiwi.com) |
Popular in | February |
Cheapest in | October |
Average price | $468 |
Good round-trip deal | $509 or less |
Good one-way deal | $398 or less |
Cheapflights Fare Finder
Customize your flight search to find flights from Atlanta 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 July 21, 2026.
Use the filters below to find and compare flights from Atlanta to Ontario that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
AtlantaOntario
ATL - ONT
ATLONT
Atlanta Hartsfield-Jackson
Thu 10/1
5:30 pm-11:55 pm
2 stops9h 25m
Ontario
Thu 10/29
1:05 pm-11:55 pm
2 stops7h 50m
$369
AtlantaOntario
ATL - ONT
ATLONT
Atlanta Hartsfield-Jackson
Sat 10/10
7:40 am-4:00 pm
2 stops11h 20m
Ontario
Sat 10/24
5:45 am-5:00 pm
2 stops8h 15m
$369
AtlantaOntario
ATL - ONT
ATLONT
Atlanta Hartsfield-Jackson
Mon 8/17
6:10 am-11:25 am
2 stops8h 15m
Ontario
Mon 8/24
12:35 pm-12:05 am
2 stops8h 30m
$401
AtlantaOntario
ATL - ONT
ATLONT
Atlanta Hartsfield-Jackson
Sat 8/22
9:25 am-10:42 am
Nonstop4h 17m
Ontario
Sat 8/29
12:00 pm-7:30 pm
Nonstop4h 30m
$439
Quickest round-trip
AtlantaOntario
ATL - ONT
ATLONT
Atlanta Hartsfield-Jackson
Fri 9/11
6:40 pm-8:05 pm
Nonstop4h 25m
Ontario
Mon 9/14
10:00 pm-5:05 am
Nonstop4h 05m
$439
AtlantaOntario
ATL - ONT
ATLONT
Atlanta Hartsfield-Jackson
Thu 8/20
8:27 pm-9:52 pm
Nonstop4h 25m
Ontario
Tue 8/25
11:56 am-11:59 pm
1 stop9h 03m
$449
AtlantaOntario
ATL - ONT
ATLONT
Atlanta Hartsfield-Jackson
Wed 10/7
9:30 am-11:08 am
Nonstop4h 38m
Ontario
Sat 10/10
12:18 pm-7:30 pm
Nonstop4h 12m
$469
AtlantaOntario
ATL - ONT
ATLONT
Atlanta Hartsfield-Jackson
Fri 10/9
5:30 pm-11:55 pm
2 stops9h 25m
Ontario
Tue 10/13
9:15 am-8:45 pm
2 stops8h 30m
$469
AtlantaOntario
ATL - ONT
ATLONT
Atlanta Hartsfield-Jackson
Mon 8/17
5:05 pm-6:30 pm
Nonstop4h 25m
Ontario
Mon 8/24
1:06 pm-11:58 pm
1 stop7h 52m
$479
AtlantaOntario
ATL - ONT
ATLONT
Atlanta Hartsfield-Jackson
Mon 8/10
5:05 pm-6:30 pm
Nonstop4h 25m
Ontario
Thu 8/20
10:00 pm-5:18 am
Nonstop4h 18m
$489
Showing 1-10 of 22 resultsSorted by cheapest first
Compare providers for flights from Atlanta 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 Atlanta to Ontario in July.
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy1 star | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy- | Trust Score*1 star | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy- | Trust Score*1 star | |
| Price Accuracy2 stars | Trust Score*3 stars | |
| Price Accuracy2 stars | Trust Score*1 star | |
| Price Accuracy2 stars | Trust Score*3 stars |
- Most accurate provider: When it comes to deals on Atlanta-Ontario flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Atlanta-Ontario flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Atlanta-Ontario flight searches over the past month and is updated monthly.
- Most trusted provider: When it comes to deals on Atlanta-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 Atlanta-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 Atlanta to Ontario
Have a flexible travel schedule? Discover the best time to fly to Ontario from Atlanta with our price prediction graph.
ATL-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.
Cheapflights Insights
Everything you need to know about your flight from Atlanta to Ontario
Prices
Airlines
Delays
More
How far ahead should I book a flight from Atlanta to Ontario?
To ensure you get the cheapest price possible for a flight from Atlanta to Ontario, you should look to book at least 18 days in advance of your intended travel date. The price of your flight may increase if you delay and leave booking until a week or so before departure.
What is the cheapest month to book a flight from Atlanta to Ontario?
Currently, October is the cheapest month in which you can book a flight from Atlanta to Ontario (average of $226). Flying from Atlanta to Ontario in February is currently the most expensive (average of $489). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.
What is the cheapest time of day to fly from ATL to ONT?
Find hourly flight availability from Atlanta to Ontario. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated July 21, 2026.
When flying from Atlanta to Ontario, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.
How often are flights from Atlanta to Ontario delayed?
About 20% of weekly flights between Atlanta and Ontario have experienced delays in the past year, with the average delay time being 130 minutes.
What is the most punctual flight time for Atlanta to Ontario flights?
Historically, flights departing in the morning are less likely to be delayed, whereas flights leaving at night tend to experience delays more often.
What day of the week experiences the fewest flight delays on this route?
Wednesday tends to have the lowest number of delays on this route, whereas Monday has historically faced a higher average of delays compared to other days of the week.
Which airline has the best punctuality record on Atlanta to Ontario flights?
Over the last year, Delta have had the lowest number of delays on this route, with just 20% of flights being delayed.
What’s the top layover airport for flights from Atlanta to Ontario?
Share of 1-stop round-trip flights from Atlanta to Ontario chosen by Cheapflights users in the past 12 months, using the same layover each way.
Denver (DEN) – chosen by Cheapflights users on 63% of 1-stop itineraries from Atlanta to Ontario on Cheapflights.
What’s the cheapest layover airport for flights from Atlanta to Ontario?
Average round-trip fare for 1-stop flights from Atlanta to Ontario, chosen by Cheapflights users in the past 12 months, with the same layover each way.
Dallas (DFW) is the most affordable 1-stop option, with an average round-trip price of $246.
What’s the fastest layover option from Atlanta to Ontario?
Shortest average travel time for 1-stop one-way flights from Atlanta to Ontario, based on itineraries clicked by Cheapflights users over the past 12 months, grouped by layover airport.
Flights via Phoenix (PHX) have the shortest average one-way travel time for 1-stop routes: 6h 25m.
Which airport typically offers the quickest layover for flights from Atlanta to Ontario?
Average layover duration for 1-stop one-way flights from Atlanta to Ontario, chosen by Cheapflights users in the last 12 months, grouped by stopover airport.
Flights via Phoenix (PHX) offer the fastest connection on this route, with an average layover time of 1h 38m.
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 July 21, 2026.
Get a feel of what it's like to fly with Southwest,Delta, andUnited Airlines from Atlanta 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
8.6
Entertainment
7.5
Boarding
8.1
Overall
8.0
Comfort
8.0
Food
7.0
Reviews
1 / 20
10.0
ExcellentWalter,May 2026
LAS - BUR
Crew
8.6
Entertainment
7.5
Boarding
8.1
Overall
8.0
Comfort
8.0
Food
7.0
Reviews
1 / 20
10.0
ExcellentWalter,May 2026
LAS - BUR
Crew
8.6
Entertainment
7.5
Boarding
8.1
Overall
8.0
Comfort
8.0
Food
7.0
Reviews
1 / 20
10.0
ExcellentWalter,May 2026
LAS - BUR
Crew
8.6
Entertainment
7.5
Boarding
8.1
Overall
8.0
Comfort
8.0
Food
7.0
Reviews
1 / 20
10.0
ExcellentWalter,May 2026
LAS - BUR
Crew
8.6
Entertainment
7.5
Boarding
8.1
Overall
8.0
Comfort
8.0
Food
7.0
Reviews
1 / 20
10.0
ExcellentWalter,May 2026
LAS - BUR
Crew
8.6
Entertainment
7.5
Boarding
8.1
Overall
8.0
Comfort
8.0
Food
7.0
Reviews
1 / 20
10.0
ExcellentWalter,May 2026
LAS - BUR
Related info for your journey
Find useful and relevant information for your journey from Atlanta 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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Top 5 airlines flying from Atlanta to Ontario
Discover the top 5 airlines that operate flights from Atlanta 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 July 21, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$144 | Average$237 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$287 | Average$468 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$295 | Average$458 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$301 | Average$526 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$338 | Average$428 | FlexibilityNo cancel fee | On-time69% |