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$75+ 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 10/31. Fares are subject to change and may not be available on all flights or dates of travel.
ATL — ONT
ago. 19 — ago. 261
mar. 8/19
mar. 8/26
1 adult, Economy
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Cheapflights Tip: The best prices from Atlanta Hartsfield-Jackson to Ontario are usually found in June or February, booked 48 days in advance, depart on a Thursday or Saturday 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 agosto 14, 2025.

Round-trip from

$150
(CheapOair)

One-way from

$75
(CheapOair)

Popular in

August

Cheapest in

June

Average price

$479

Good round-trip deal

$429 or less

Good one-way deal

$598 or less
From Atlanta Hartsfield-Jackson to Ontario
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One-way flight from Atlanta Hartsfield-Jackson to Ontario
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Highest demand for flights based on searches. 6% potential increase in price ($27 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($10 potential savings vs. average RT price).
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Average for round-trip flights in August 2025
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Price to beat on a round-trip flight from Atlanta Hartsfield-Jackson to Ontario.
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Price to beat on a one-way flight from Atlanta Hartsfield-Jackson to Ontario.
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Find flight deals from Atlanta to Ontario

Cheapest flights from Atlanta to Ontario
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 agosto 14, 2025.

This CheapOair deal was found by Cheapflights users on 8/13. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 10/810:29 amATL - ONT
1 stop26h 06mFrontier
mié. 10/226:53 amONT - ATL
1 stop20h 09mFrontier
Deal found 8/13$150
This Booking.com deal was found by Cheapflights users on 8/14. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 9/67:34 amATL - ONT
1 stop15h 20mFrontier
mar. 9/98:59 pmONT - ATL
1 stop21h 57mFrontier
Deal found 8/14$151
This CheapOair deal was found by Cheapflights users on 8/14. 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.
jue. 9/258:30 pmATL - ONT
1 stop25h 05mFrontier
vie. 10/34:08 pmONT - ATL
1 stop21h 38mFrontier
Deal found 8/14$152
This Booking.com deal was found by Cheapflights users on 8/14. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 9/38:00 amATL - ONT
1 stop26h 23mFrontier
dom. 9/77:15 pmONT - ATL
1 stop10h 44mFrontier
Deal found 8/14$153
This CheapOair deal was found by Cheapflights users on 8/14. 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.
jue. 10/96:35 amATL - ONT
1 stop11h 57mFrontier
mar. 10/148:00 amONT - ATL
1 stop19h 08mFrontier
Deal found 8/14$159
This Frontier deal was found by Cheapflights users on 8/13. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 11/77:55 pmATL - ONT
1 stop6h 55mFrontier
dom. 11/910:14 amONT - ATL
1 stop7h 49mFrontier
Deal found 8/13$162
This FlightHub deal was found by Cheapflights users on 8/14. 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.
sáb. 10/116:29 pmATL - ONT
1 stop8h 21mFrontier
dom. 10/1912:49 pmONT - ATL
1 stop29h 12mFrontier
Deal found 8/14$169
This Frontier deal was found by Cheapflights users on 8/13. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 9/126:55 pmATL - ONT
1 stop7h 43mFrontier
dom. 9/147:15 pmONT - ATL
1 stop10h 44mFrontier
Deal found 8/13$170
This CheapOair deal was found by Cheapflights users on 8/14. 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.
vie. 10/248:39 pmATL - ONT
1 stop13h 50mFrontier
vie. 10/3112:59 amONT - ATL
1 stop13h 24mFrontier
Deal found 8/14$172
This CheapOair deal was found by Cheapflights users on 8/14. 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.
vie. 10/37:23 pmATL - ONT
1 stop27h 31mFrontier
vie. 10/105:15 pmONT - ATL
1 stop9h 53mFrontier
Deal found 8/14$175
This CheapOair deal was found by Cheapflights users on 8/13. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 8/208:00 amATL - ONT
1 stop18h 50mFrontier
mar. 8/2612:59 amONT - ATL
1 stop26h 06mFrontier
Deal found 8/13$176
This FlightHub deal was found by Cheapflights users on 8/14. 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.
dom. 10/127:30 amATL - ONT
1 stop29h 05mFrontier
dom. 10/196:53 amONT - ATL
1 stop20h 09mFrontier
Deal found 8/14$179

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 agosto 14, 2025.
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

mié. 10/8

10:29 am-11:50 pm

1 stop16h 21m

Ontario

sáb. 10/11

7:04 am-6:02 am

1 stop19h 58m

$150

AtlantaOntario

ATL - ONT

ATLONT

Atlanta Hartsfield-Jackson

lun. 9/15

7:34 am-7:54 pm

1 stop15h 20m

Ontario

dom. 9/21

3:43 pm-6:04 am

1 stop11h 21m

$150

AtlantaOntario

ATL - ONT

ATLONT

Atlanta Hartsfield-Jackson

lun. 9/22

7:34 am-7:54 pm

1 stop15h 20m

Ontario

lun. 9/29

4:08 pm-9:56 pm

1 stop26h 48m

$150

AtlantaOntario

ATL - ONT

ATLONT

Atlanta Hartsfield-Jackson

sáb. 9/20

5:41 pm-7:23 am

1 stop16h 42m

Ontario

lun. 9/22

4:08 pm-9:56 pm

1 stop26h 48m

$150

AtlantaOntario

ATL - ONT

ATLONT

Atlanta Hartsfield-Jackson

vie. 10/17

7:55 pm-11:50 pm

1 stop6h 55m

Ontario

mié. 10/22

6:53 am-6:48 pm

1 stop8h 55m

$150

AtlantaOntario

ATL - ONT

ATLONT

Atlanta Hartsfield-Jackson

jue. 9/4

7:23 pm-7:23 am

1 stop15h 00m

Ontario

lun. 9/8

8:59 pm-9:56 pm

1 stop21h 57m

$150

AtlantaOntario

ATL - ONT

ATLONT

Atlanta Hartsfield-Jackson

dom. 11/2

8:00 pm-11:10 am

1 stop18h 10m

Ontario

dom. 11/9

6:53 am-6:02 am

1 stop20h 09m

$150

AtlantaOntario

ATL - ONT

ATLONT

Atlanta Hartsfield-Jackson

vie. 10/17

7:55 pm-11:50 pm

1 stop6h 55m

Ontario

lun. 10/20

6:53 am-6:02 am

1 stop20h 09m

$150

AtlantaOntario

ATL - ONT

ATLONT

Atlanta Hartsfield-Jackson

mar. 9/23

7:42 am-7:54 pm

1 stop15h 12m

Ontario

mar. 9/30

8:59 pm-9:56 pm

1 stop21h 57m

$150

AtlantaOntario

ATL - ONT

ATLONT

Atlanta Hartsfield-Jackson

mié. 10/8

10:29 am-9:35 am

1 stop26h 06m

Ontario

mié. 10/22

6:53 am-6:02 am

1 stop20h 09m

$150

Flights are sorted by cheapest round-trip flights first.

Deals found on 8/14

Showing 1-10 of 23 results
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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

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 August 8, 2025.

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, August is the cheapest month in which you can book a flight from Atlanta to Ontario (average of $246). Flying from Atlanta to Ontario in March is currently the most expensive (average of $328). 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 agosto 14, 2025.

Unlike in the morning, when flights are generally more expensive, you can save up to 18% on flights from Atlanta to Ontario by exploring options for tickets at noon.

What is the cheapest day to fly from Atlanta to Ontario?

Use this chart to determine the cheapest time to fly round-trip from Atlanta to Ontario. Price data was last updated on August 10, 2025.

Travelers seeking maximum savings on their Atlanta to Ontario flight should consider departing on Wednesday at noon when fares are most often at their lowest. Monday mornings flights should be avoided if possible as fares are typically the most expensive at this time.

Weekly flight availability from Atlanta to Ontario

Explore weekly flight availability from Atlanta to Ontario. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated agosto 14, 2025.

The most flights from ATL to ONT are scheduled on a Monday (11 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (4 on average).

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 86% 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.

Denver (DEN) is the most affordable 1-stop option, with an average round-trip price of $141.

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 agosto 14, 2025.
Get a feel of what it's like to fly with Southwest, Delta, and American 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.
Southwest
8.0
Very good
4,244 reviews

Overall

8.0

Entertainment

7.5

Crew

8.6

Comfort

8.0

Boarding

8.1

Food

7.0

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
Southwest
8.0
Very good
4,244 reviews
Southwest
8.0
Very good
4,244 reviews

Overall

8.0

Entertainment

7.5

Crew

8.6

Comfort

8.0

Boarding

8.1

Food

7.0

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
Delta
8.0
Very good
7,980 reviews
Southwest
8.0
Very good
4,244 reviews

Overall

8.0

Entertainment

7.5

Crew

8.6

Comfort

8.0

Boarding

8.1

Food

7.0

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
American Airlines
7.2
Good
10,000 reviews
Southwest
8.0
Very good
4,244 reviews

Overall

8.0

Entertainment

7.5

Crew

8.6

Comfort

8.0

Boarding

8.1

Food

7.0

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
Spirit Airlines
6.3
Okay
8,045 reviews
Southwest
8.0
Very good
4,244 reviews

Overall

8.0

Entertainment

7.5

Crew

8.6

Comfort

8.0

Boarding

8.1

Food

7.0

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
Frontier
5.8
Fair
3,219 reviews
Southwest
8.0
Very good
4,244 reviews

Overall

8.0

Entertainment

7.5

Crew

8.6

Comfort

8.0

Boarding

8.1

Food

7.0

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.

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.

  • What airports do I use to fly from Atlanta to Ontario?

    To fly from Atlanta to Ontario, you need to book a flight from Hartsfield-Jackson (ATL) to Ontario (ONT). Nonstop flights to Ontario from Atlanta Hartsfield-Jackson take 4h 15m on average. When it comes time to book airfare, you have a few options: there are 10 outbound flights from Hartsfield-Jackson to Ontario offered by 5 different airlines.

  • How popular is this Atlanta to Ontario flight route?

    Flights from Atlanta Hartsfield-Jackson to Ontario have been viewed 1 times in the past calendar month.

  • What are the cheapest airlines flying from Atlanta to Ontario round-trip?

    According to our current data, Frontier ($128), Spirit Airlines ($130), and American Airlines ($256) offers the cheapest pricing from Atlanta to Ontario. These flights start at 65% lower than the current average price 3 months from now.

  • What are the most reliable airlines from Atlanta to Ontario?

    The top 3 most reliable airlines when flying from Atlanta to Ontario are LATAM Airlines (75%), Delta (65%) and Aeromexico (51%).

  • What are the cheapest flights from Atlanta to Ontario?

    Looking at all options, your cheapest flight can be booked for $299. While the most popular route (Atlanta Hartsfield-Jackson - Ontario) can be booked for $198 on average our data indicates $599 when flying from Atlanta to Ontario.

  • Can I find deals for flights from Atlanta to Ontario that include hotel bookings?

    Yes. In addition to deals on Atlanta to Ontario flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Atlanta to Ontario?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Atlanta to Ontario.

  • Can I find deals for business class flights from Atlanta to Ontario?

    Yes. Cheapflights offers flight deals from Atlanta to Ontario by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from Atlanta to Ontario?

    Currently, August is the cheapest month in which you can book a flight from Atlanta to Ontario (average of $246). Flying from Atlanta to Ontario in March is currently the most expensive (average of $328). 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.

See more FAQs

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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.
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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 agosto 14, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$128Average$236FlexibilityNo cancel feeOn-time62%
Spirit AirlinesCheapest$130Average$268FlexibilityNo cancel feeOn-time65%
American AirlinesCheapest$256Average$420FlexibilityNo cancel feeOn-time71%
DeltaCheapest$299Average$495FlexibilityNo cancel feeOn-timeN/A
SouthwestCheapest$318Average$417FlexibilityNo cancel feeOn-time63%

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