$92+ Cheap flights from Atlanta to Ontario (ATL - 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 9/30. Fares are subject to change and may not be available on all flights or dates of travel.
ATL — ONT
Sep 30 — Oct 71
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 Thursday or Tuesday 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 August 31, 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 August 31, 2026.
This FlightHub deal was found by Cheapflights users on 8/26. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/137:59 pm -
1 stop6h 48m
Thu 9/176:45 pm -
1 stop26h 28m
Deal found 8/26![Frontier logo]()
$318
This Frontier deal was found by Cheapflights users on 8/28. 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.
Fri 10/26:41 am -
1 stop6h 49m
Tue 10/611:45 am -
1 stop9h 25m
Deal found 8/28![Frontier logo]()
$320
This Cheapflightsfares deal was found by Cheapflights users on 8/27. 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.
Mon 9/149:18 pm -
1 stop14h 51m
Fri 9/188:00 am -
1 stop27h 39m
Deal found 8/27![Frontier logo]()
$321
This Kiwi.com deal was found by Cheapflights users on 8/27. 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 9/279:18 pm -
1 stop12h 46m
Sun 10/47:46 pm -
1 stop12h 44m
Deal found 8/27![Frontier logo]()
$322
This Kiwi.com deal was found by Cheapflights users on 8/28. 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 11/126:55 am -
1 stop19h 56m
Sun 11/158:35 pm -
1 stop29h 14m
Deal found 8/28![Frontier logo]()
$323
This Kiwi.com deal was found by Cheapflights users on 8/28. 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 9/279:18 pm -
1 stop12h 46m
Sat 10/35:31 pm -
1 stop26h 37m
Deal found 8/28![Frontier logo]()
$324
This Frontier deal was found by Cheapflights users on 8/26. 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.
Fri 9/116:41 am -
1 stop6h 49m
Fri 9/186:45 pm -
1 stop11h 35m
Deal found 8/26![Frontier logo]()
$325
This FlightHub deal was found by Cheapflights users on 8/29. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/211:36 am -
1 stop7h 13m
Wed 9/306:15 am -
1 stop8h 16m
Deal found 8/29![Frontier logo]()
$327
This FlightHub deal was found by Cheapflights users on 8/29. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/289:18 pm -
1 stop14h 51m
Wed 9/306:15 am -
1 stop8h 16m
Deal found 8/29![Frontier logo]()
$329
This CheapOair deal was found by Cheapflights users on 8/29. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/219:18 pm -
1 stop22h 41m
Sat 9/262:30 pm -
1 stop11h 30m
Deal found 8/29![Frontier logo]()
$330
This Cheapflightsfares deal was found by Cheapflights users on 8/31. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/27:59 pm -
1 stop17h 31m
Sun 10/412:07 pm -
1 stop14h 43m
Deal found 8/31![Frontier logo]()
$331
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 August 31, 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 August 31, 2026.
This KAYAK deal was found by Cheapflights users on 8/26. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/297:03 am -
1 stop10h 13m
Wed 9/3012:12 pm -
1 stop8h 47m
Deal found 8/26![Alaska Airlines logo]()
$431
This Delta deal was found by Cheapflights users on 8/28. 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 11/149:25 am -
Nonstop4h 43m
Tue 11/1712:18 pm -
Nonstop4h 06m
Deal found 8/28![Delta logo]()
$469
This Alaska Airlines deal was found by Cheapflights users on 8/27. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/141:28 pm -
2 stops24h 50m
Tue 11/1710:40 am -
2 stops27h 23m
Deal found 8/27![Alaska Airlines logo]()
$458
This Delta deal was found by Cheapflights users on 8/29. 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 9/309:47 am -
Nonstop4h 22m
Mon 10/510:00 pm -
Nonstop4h 05m
Deal found 8/29![Delta logo]()
$469
This Delta deal was found by Cheapflights users on 8/30. 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 10/296:54 pm -
Nonstop4h 31m
Mon 11/21:35 pm -
1 stop7h 00m
Deal found 8/30![Delta logo]()
$479
This Alaska Airlines deal was found by Cheapflights users on 8/30. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/156:10 pm -
1 stop8h 44m
Sun 10/186:56 pm -
1 stop9h 34m
Deal found 8/30![Alaska Airlines logo]()
$490
This Delta deal was found by Cheapflights users on 8/30. 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 10/25:59 pm -
1 stop8h 48m
Sun 10/410:00 pm -
Nonstop4h 05m
Deal found 8/30![Delta logo]()
$479
This Alaska Airlines deal was found by Cheapflights users on 8/30. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/74:35 pm -
2 stops27h 30m
Tue 10/1311:13 am -
1 stop9h 46m
Deal found 8/30![Alaska Airlines logo]()
$494
This Delta deal was found by Cheapflights users on 8/29. 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 11/138:05 am -
1 stop7h 12m
Mon 11/1612:18 pm -
Nonstop4h 06m
Deal found 8/29![Delta logo]()
$479
Last-minute flights from Atlanta to OntarioDiscover last-minute flight deals from Atlanta to Ontario. Data last updated August 31, 2026 and is based on user searches.
Discover last-minute flight deals from Atlanta to Ontario. Data last updated August 31, 2026 and is based on user searches.
This FlightHub deal was found by Cheapflights users on 8/29. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/211:36 am -
1 stop7h 13m
Wed 9/306:15 am -
1 stop8h 16m
Deal found 8/29![Frontier logo]()
$327
This Trip.com deal was found by Cheapflights users on 8/27. 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.
Thu 9/106:41 am -
1 stop6h 49m
Wed 9/1611:45 am -
1 stop9h 25m
Deal found 8/27![Frontier logo]()
$332
This Frontier deal was found by Cheapflights users on 8/26. 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.
Fri 9/116:41 am -
1 stop6h 49m
Fri 9/186:45 pm -
1 stop11h 35m
Deal found 8/26![Frontier logo]()
$325
This FlightHub deal was found by Cheapflights users on 8/26. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/137:59 pm -
1 stop6h 48m
Thu 9/176:45 pm -
1 stop26h 28m
Deal found 8/26![Frontier logo]()
$318
This Cheapflightsfares deal was found by Cheapflights users on 8/27. 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.
Mon 9/149:18 pm -
1 stop14h 51m
Fri 9/188:00 am -
1 stop27h 39m
Deal found 8/27![Frontier logo]()
$321
This Cheapflightsfares deal was found by Cheapflights users on 8/28. 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.
Sat 9/195:25 pm -
1 stop29h 11m
Mon 9/216:15 am -
1 stop14h 55m
Deal found 8/28![Frontier logo]()
$334
This CheapOair deal was found by Cheapflights users on 8/29. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/219:18 pm -
1 stop22h 41m
Sat 9/262:30 pm -
1 stop11h 30m
Deal found 8/29![Frontier logo]()
$330
This Kiwi.com deal was found by Cheapflights users on 8/27. 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 9/279:18 pm -
1 stop12h 46m
Sun 10/47:46 pm -
1 stop12h 44m
Deal found 8/27![Frontier logo]()
$322
This Kiwi.com deal was found by Cheapflights users on 8/28. 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 9/279:18 pm -
1 stop12h 46m
Sat 10/35:31 pm -
1 stop26h 37m
Deal found 8/28![Frontier logo]()
$324
This FlightHub deal was found by Cheapflights users on 8/29. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/289:18 pm -
1 stop14h 51m
Wed 9/306:15 am -
1 stop8h 16m
Deal found 8/29![Frontier logo]()
$329
This Cheapflightsfares deal was found by Cheapflights users on 8/30. 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.
Tue 9/298:59 pm -
1 stop15h 10m
Sun 10/46:45 pm -
1 stop11h 35m
Deal found 8/30![Frontier logo]()
$331
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 August 31, 2026.
Search for one-way flight options from Atlanta to Ontario. Find affordable one-way fares based on user searches. Data last updated August 31, 2026.
This Trip.com deal was found by Cheapflights users on 8/26. 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.
Wed 9/306:41 am -
1 stop20h 06m
Deal found 8/26![Frontier logo]()
$92
This Kiwi.com deal was found by Cheapflights users on 8/27. 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 9/297:38 pm -
1 stop17h 52m
Deal found 8/27![Frontier logo]()
$96
This Kiwi.com deal was found by Cheapflights users on 8/29. 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 10/277:57 pm -
1 stop17h 38m
Deal found 8/29![Frontier logo]()
$97
This WAYA deal was found by Cheapflights users on 8/28. 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 WAYA is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/37:59 pm -
1 stop6h 48m
Deal found 8/28![Frontier logo]()
$99
This Cheapflightsfares deal was found by Cheapflights users on 8/27. 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.
Wed 9/237:38 pm -
1 stop7h 09m
Deal found 8/27![Frontier logo]()
$117
This Super.com deal was found by Cheapflights users on 8/26. 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.
Sat 10/2410:30 am -
1 stop9h 18m
Deal found 8/26![Frontier logo]()
$118
This Frontier deal was found by Cheapflights users on 8/27. 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.
Mon 10/267:58 pm -
1 stop6h 52m
Deal found 8/27![Frontier logo]()
$119
This Frontier deal was found by Cheapflights users on 8/26. 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.
Sat 10/107:58 pm -
1 stop6h 52m
Deal found 8/26![Frontier logo]()
$120
This Kiwi.com deal was found by Cheapflights users on 8/29. 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 10/3111:26 am -
2 stops15h 25m
Deal found 8/29![Frontier logo]()
$122
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 August 31, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $318 (FlightHub) |
One-way from | $92 (Trip.com) |
Popular in | August |
Cheapest in | October |
Average price | $498 |
Good round-trip deal | $459 or less |
Good one-way deal | $473 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 7,457,451 searches. Data last updated August 31, 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 Atlanta Hartsfield-Jackson - ONT Ontario
ATLONT
Atlanta Hartsfield-Jackson
Tue 9/29
7:03 am-2:16 pm
1 stop10h 13m
Ontario
Wed 9/30
12:12 pm-11:59 pm
1 stop8h 47m
$431
AtlantaOntario
ATL Atlanta Hartsfield-Jackson - ONT Ontario
ATLONT
Atlanta Hartsfield-Jackson
Sat 11/14
1:28 pm-11:18 am
2 stops24h 50m
Ontario
Tue 11/17
10:40 am-5:03 pm
2 stops27h 23m
$458
AtlantaOntario
ATL Atlanta Hartsfield-Jackson - ONT Ontario
ATLONT
Atlanta Hartsfield-Jackson
Sat 11/14
9:25 am-11:08 am
Nonstop4h 43m
Ontario
Tue 11/17
12:18 pm-7:24 pm
Nonstop4h 06m
$469
Quickest round-trip
AtlantaOntario
ATL Atlanta Hartsfield-Jackson - ONT Ontario
ATLONT
Atlanta Hartsfield-Jackson
Wed 9/30
9:47 am-11:09 am
Nonstop4h 22m
Ontario
Mon 10/5
10:00 pm-5:05 am
Nonstop4h 05m
$469
AtlantaOntario
ATL Atlanta Hartsfield-Jackson - ONT Ontario
ATLONT
Atlanta Hartsfield-Jackson
Thu 10/29
6:54 pm-8:25 pm
Nonstop4h 31m
Ontario
Mon 11/2
1:35 pm-11:35 pm
1 stop7h 00m
$479
AtlantaOntario
ATL Atlanta Hartsfield-Jackson - ONT Ontario
ATLONT
Atlanta Hartsfield-Jackson
Fri 10/2
5:59 pm-11:47 pm
1 stop8h 48m
Ontario
Sun 10/4
10:00 pm-5:05 am
Nonstop4h 05m
$479
AtlantaOntario
ATL Atlanta Hartsfield-Jackson - ONT Ontario
ATLONT
Atlanta Hartsfield-Jackson
Fri 11/13
8:05 am-12:17 pm
1 stop7h 12m
Ontario
Mon 11/16
12:18 pm-7:24 pm
Nonstop4h 06m
$479
AtlantaOntario
ATL Atlanta Hartsfield-Jackson - ONT Ontario
ATLONT
Atlanta Hartsfield-Jackson
Thu 10/15
6:10 pm-11:54 pm
1 stop8h 44m
Ontario
Sun 10/18
6:56 pm-7:30 am
1 stop9h 34m
$490
AtlantaOntario
ATL Atlanta Hartsfield-Jackson - ONT Ontario
ATLONT
Atlanta Hartsfield-Jackson
Wed 10/7
4:35 pm-5:05 pm
2 stops27h 30m
Ontario
Tue 10/13
11:13 am-11:59 pm
1 stop9h 46m
$494
Cheapest one-way
AtlantaOntario
ATL Atlanta Hartsfield-Jackson - ONT Ontario
ATLONT
Atlanta Hartsfield-Jackson
Wed 2/24
8:00 am-2:47 pm
1 stop9h 47m
$220
Showing 1-10 of 20 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 August.
| 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 Accuracy- | Trust Score*1 star | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| 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 $254). Flying from Atlanta to Ontario in August is currently the most expensive (average of $498). 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 August 31, 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 21% of weekly flights between Atlanta and Ontario have experienced delays in the past year, with the average delay time being 133 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 21% 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 August 31, 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.
Food
7.0
Crew
8.6
Comfort
8.0
Entertainment
7.5
Overall
8.0
Boarding
8.1
Reviews
1 / 20
10.0
ExcellentWalter,May 2026
LAS - BUR
Food
7.0
Crew
8.6
Comfort
8.0
Entertainment
7.5
Overall
8.0
Boarding
8.1
Reviews
1 / 20
10.0
ExcellentWalter,May 2026
LAS - BUR
Food
7.0
Crew
8.6
Comfort
8.0
Entertainment
7.5
Overall
8.0
Boarding
8.1
Reviews
1 / 20
10.0
ExcellentWalter,May 2026
LAS - BUR
Food
7.0
Crew
8.6
Comfort
8.0
Entertainment
7.5
Overall
8.0
Boarding
8.1
Reviews
1 / 20
10.0
ExcellentWalter,May 2026
LAS - BUR
Food
7.0
Crew
8.6
Comfort
8.0
Entertainment
7.5
Overall
8.0
Boarding
8.1
Reviews
1 / 20
10.0
ExcellentWalter,May 2026
LAS - BUR
Food
7.0
Crew
8.6
Comfort
8.0
Entertainment
7.5
Overall
8.0
Boarding
8.1
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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Other flights to Ontario
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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 7,457,451 searches. Data last updated August 31, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$152 | Average$239 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$287 | Average$468 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$295 | Average$458 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$319 | Average$540 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$338 | Average$428 | FlexibilityNo cancel fee | On-time69% |