$61+ 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 2/10. Fares are subject to change and may not be available on all flights or dates of travel.
ATL — ONT
Feb 13 — Feb 201
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 June, booked 48 days in advance, depart on a Tuesday or Thursday and return on a Saturday
Cheap 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 January 14, 2026.
Most accurate provider | CheapOair 3 stars |
|---|---|
Most trusted provider | CheapOair 3 stars |
Round-trip from | $133 (Kiwi.com) |
One-way from | $61 (Trip.com) |
Popular in | December |
Cheapest in | October |
Average price | $394 |
Good round-trip deal | $449 or less |
Good one-way deal | $398 or less |
Find flight deals from Atlanta to Ontario
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 January 14, 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 January 14, 2026.
This Kiwi.com deal was found by Cheapflights users on 1/12. 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 2/256:00 am
ATL
- ONT
1 stop18h 34m
Frontier
Tue 3/38:40 am
ONT
- ATL
1 stop18h 35m
Frontier
Deal found 1/12![Frontier logo]()
$133
This Kiwi.com deal was found by Cheapflights users on 1/10. 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 2/248:00 pm
ATL
- ONT
1 stop28h 34m
Multiple Airlines
Sat 2/288:21 am
ONT
- ATL
1 stop12h 23m
Multiple Airlines
Deal found 1/10![Multiple Airlines logo]()
$143
This Kiwi.com deal was found by Cheapflights users on 1/10. 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 2/209:10 pm
ATL
- ONT
1 stop13h 16m
Frontier
Tue 2/248:35 am
ONT
- ATL
1 stop7h 11m
Frontier
Deal found 1/10![Frontier logo]()
$145
This Kiwi.com deal was found by Cheapflights users on 1/11. 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 2/116:00 am
ATL
- ONT
1 stop18h 34m
Frontier
Wed 2/187:30 am
ONT
- ATL
1 stop19h 45m
Frontier
Deal found 1/11![Frontier logo]()
$146
This Kiwi.com deal was found by Cheapflights users on 1/12. 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 2/310:40 am
ATL
- ONT
1 stop7h 27m
Frontier
Wed 2/117:17 pm
ONT
- ATL
1 stop8h 46m
Frontier
Deal found 1/12![Frontier logo]()
$147
This Frontier deal was found by Cheapflights users on 1/10. 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 2/217:53 pm
ATL
- ONT
1 stop7h 06m
Frontier
Wed 2/253:22 pm
ONT
- ATL
1 stop12h 41m
Frontier
Deal found 1/10![Frontier logo]()
$148
This CheapOair deal was found by Cheapflights users on 1/11. 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.
Wed 2/188:50 pm
ATL
- ONT
1 stop19h 21m
Frontier
Tue 2/243:22 pm
ONT
- ATL
1 stop12h 40m
Frontier
Deal found 1/11![Frontier logo]()
$149
This Frontier deal was found by Cheapflights users on 1/12. 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.
Tue 3/106:00 am
ATL
- ONT
1 stop12h 05m
Frontier
Tue 3/246:15 am
ONT
- ATL
1 stop8h 58m
Frontier
Deal found 1/12![Frontier logo]()
$150
This Kiwi.com deal was found by Cheapflights users on 1/13. 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 2/248:00 pm
ATL
- ONT
1 stop28h 34m
Frontier
Sun 3/16:10 am
ONT
- ATL
1 stop21h 05m
Frontier
Deal found 1/13![Frontier logo]()
$152
This Kiwi.com deal was found by Cheapflights users on 1/11. 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 1/308:04 pm
ATL
- ONT
1 stop30h 20m
Frontier
Tue 2/37:15 am
ONT
- ATL
1 stop26h 21m
Frontier
Deal found 1/11![Frontier logo]()
$153
This Kiwi.com deal was found by Cheapflights users on 1/10. 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 2/217:53 pm
ATL
- ONT
1 stop15h 06m
Multiple Airlines
Sat 2/288:21 am
ONT
- ATL
1 stop12h 23m
Multiple Airlines
Deal found 1/10![Multiple Airlines logo]()
$156
This Kiwi.com deal was found by Cheapflights users on 1/11. 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 2/116:00 am
ATL
- ONT
1 stop18h 34m
Frontier
Thu 2/126:05 am
ONT
- ATL
1 stop10h 13m
Frontier
Deal found 1/11![Frontier logo]()
$158
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 January 14, 2026.
Use the filters below to find and compare flights from Atlanta to Ontario that are best for you.
Fly from
Atlanta
Fly to
Ontario
Route
Depart
Return
Price
AtlantaOntario
ATL - ONT
ATLONT
Atlanta Hartsfield-Jackson
Sun 4/5
9:51 am-5:15 pm
1 stop10h 24m
Ontario
Mon 4/13
11:10 am-6:54 am
1 stop16h 44m
$261
AtlantaOntario
ATL - ONT
ATLONT
Atlanta Hartsfield-Jackson
Sat 3/28
6:20 pm-12:05 am
2 stops8h 45m
Ontario
Sat 4/4
5:15 am-3:50 pm
2 stops7h 35m
$396
AtlantaOntario
ATL - ONT
ATLONT
Atlanta Hartsfield-Jackson
Sat 3/14
7:04 am-11:32 pm
1 stop19h 28m
Ontario
Wed 4/29
3:26 pm-5:40 am
1 stop11h 14m
$403
AtlantaOntario
ATL - ONT
ATLONT
Atlanta Hartsfield-Jackson
Thu 3/26
6:00 am-12:30 pm
2 stops9h 30m
Ontario
Fri 4/3
1:00 pm-11:15 pm
2 stops7h 15m
$413
AtlantaOntario
ATL - ONT
ATLONT
Atlanta Hartsfield-Jackson
Thu 3/19
7:18 pm-9:04 pm
Nonstop4h 46m
Ontario
Mon 3/23
10:25 pm-5:28 am
Nonstop4h 03m
$419
AtlantaOntario
ATL - ONT
ATLONT
Atlanta Hartsfield-Jackson
Sat 2/21
7:18 pm-9:05 pm
Nonstop4h 47m
Ontario
Tue 2/24
10:20 pm-5:28 am
Nonstop4h 08m
$419
AtlantaOntario
ATL - ONT
ATLONT
Atlanta Hartsfield-Jackson
Sat 3/14
9:50 am-11:40 am
Nonstop4h 50m
Ontario
Wed 4/29
7:00 am-2:11 pm
Nonstop4h 11m
$419
AtlantaOntario
ATL - ONT
ATLONT
Atlanta Hartsfield-Jackson
Thu 3/26
7:18 pm-9:04 pm
Nonstop4h 46m
Ontario
Thu 4/2
10:25 pm-5:28 am
Nonstop4h 03m
$419
AtlantaOntario
ATL - ONT
ATLONT
Atlanta Hartsfield-Jackson
Thu 3/12
9:50 am-11:40 am
Nonstop4h 50m
Ontario
Mon 3/16
10:25 pm-5:28 am
Nonstop4h 03m
$419
AtlantaOntario
ATL - ONT
ATLONT
Atlanta Hartsfield-Jackson
Sat 2/21
10:10 am-12:02 pm
Nonstop4h 52m
Ontario
Mon 3/2
10:20 pm-5:28 am
Nonstop4h 08m
$422
Showing 1-10 of 22 results
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 January.
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy2 stars | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*1 star | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy- | Trust Score*1 star | |
| Price Accuracy- | Trust Score*1 star | |
| Price Accuracy3 stars | Trust Score*2 stars | |
| Price Accuracy1 star | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars |
- Most accurate provider: When it comes to deals on Atlanta-Ontario flights, users find the pricing of CheapOair to be most consistent on Cheapflights vs. CheapOair Users can find the same prices on Atlanta-Ontario flight deals on Cheapflights vs. CheapOair >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 CheapOair the most. CheapOair 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.
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?
Use this chart to determine the optimal time to book a round-trip flight from Atlanta to Ontario. Price data was last updated on January 9, 2026.
To ensure you get the cheapest price possible for a flight from Atlanta to Ontario, you should look to book at least 48 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, February is the cheapest month in which you can book a flight from Atlanta to Ontario (average of $79). Flying from Atlanta to Ontario in June is currently the most expensive (average of $138). 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 January 14, 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 19% of weekly flights between Atlanta and Ontario have experienced delays in the past year, with the average delay time being 123 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 Sunday 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 19% 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.
Las Vegas (LAS) – 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 $153.
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 Austin (AUS) have the shortest average one-way travel time for 1-stop routes: 6h 20m.
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 Austin (AUS) offer the fastest connection on this route, with an average layover time of 1h 35m.
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 January 14, 2026.
Get a feel of what it's like to fly with Southwest, Delta, and United 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.
Entertainment
7.5
Boarding
8.1
Food
7.0
Comfort
8.0
Overall
8.0
Crew
8.6
Reviews
1 / 20
8.0
ExcellentWalter,Aug 2025
OAK - SAN
Entertainment
7.5
Boarding
8.1
Food
7.0
Comfort
8.0
Overall
8.0
Crew
8.6
Reviews
1 / 20
8.0
ExcellentWalter,Aug 2025
OAK - SAN
Entertainment
7.5
Boarding
8.1
Food
7.0
Comfort
8.0
Overall
8.0
Crew
8.6
Reviews
1 / 20
8.0
ExcellentWalter,Aug 2025
OAK - SAN
Entertainment
7.5
Boarding
8.1
Food
7.0
Comfort
8.0
Overall
8.0
Crew
8.6
Reviews
1 / 20
8.0
ExcellentWalter,Aug 2025
OAK - SAN
Entertainment
7.5
Boarding
8.1
Food
7.0
Comfort
8.0
Overall
8.0
Crew
8.6
Reviews
1 / 20
8.0
ExcellentWalter,Aug 2025
OAK - SAN
Entertainment
7.5
Boarding
8.1
Food
7.0
Comfort
8.0
Overall
8.0
Crew
8.6
Reviews
1 / 20
8.0
ExcellentWalter,Aug 2025
OAK - SAN
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.
Browse thousands of different options on Cheapflights for your next trip
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Alternative routes for Atlanta to Ontario
See prices for flight routes from nearby airports that may be better suited for you.
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 January 14, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$141 | Average$210 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$280 | Average$415 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$299 | Average$499 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$325 | Average$420 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$338 | Average$428 | FlexibilityNo cancel fee | On-time69% |