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$123+ 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 8/29. Fares are subject to change and may not be available on all flights or dates of travel.
ATL — ONT
Jun 17 — Jun 241
Tue 6/17
Tue 6/24
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 46 days in advance, depart on a Saturday 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 June 12, 2025.

Round-trip from

$247
(FlightHub)

One-way from

$123
(FlightHub)

Popular in

December

Cheapest in

June

Average price

$270

Good round-trip deal

$399 or less

Good one-way deal

$344 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. 7% potential increase in price ($27 potential increase over avg. RT price).
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Cheapest flight prices on average. 1% potential price decrease ($7 potential savings vs. average RT price).
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Average for round-trip flights in June 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 June 12, 2025.

This FlightHub deal was found by Cheapflights users on 6/10. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/176:30 pmATL - ONT
1 stop8h 20mFrontier
Mon 9/227:35 pmONT - ATL
1 stop6h 34mFrontier
Deal found 6/10$247
This Alaska Airlines deal was found by Cheapflights users on 6/9. 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 11/66:04 pmATL - ONT
1 stop8h 52mAlaska Airlines
Tue 11/117:25 amONT - ATL
1 stop28h 11mAlaska Airlines
Deal found 6/9$297
This United Airlines deal was found by Cheapflights users on 6/10. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/309:35 amATL - ONT
2 stops13h 42mUnited Airlines
Mon 11/36:38 pmONT - ATL
1 stop8h 33mUnited Airlines
Deal found 6/10$392
This Delta deal was found by Cheapflights users on 6/10. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 7/265:59 pmATL - ONT
Nonstop4h 21mDelta
Sat 8/27:05 amONT - ATL
Nonstop4h 29mDelta
Deal found 6/10$399
This Southwest deal was found by Cheapflights users on 6/10. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/102:45 pmATL - ONT
2 stops8h 15mSouthwest
Wed 7/169:45 amONT - ATL
1 stop7h 10mSouthwest
Deal found 6/10$413

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 June 12, 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

Sun 8/24

7:32 pm-11:50 pm

1 stop7h 18m

Ontario

Sun 8/31

9:41 pm-6:26 am

1 stop29h 45m

$251

AtlantaOntario

ATL - ONT

ATLONT

Atlanta Hartsfield-Jackson

Sat 8/9

6:11 pm-11:59 pm

1 stop8h 48m

Ontario

Wed 8/27

11:39 am-11:59 pm

1 stop9h 20m

$388

AtlantaOntario

ATL - ONT

ATLONT

Atlanta Hartsfield-Jackson

Sat 7/26

5:59 pm-7:20 pm

Nonstop4h 21m

Ontario

Mon 7/28

10:05 pm-5:27 am

Nonstop4h 22m

$399

AtlantaOntario

ATL - ONT

ATLONT

Atlanta Hartsfield-Jackson

Thu 7/10

2:45 pm-8:00 pm

2 stops8h 15m

Ontario

Wed 7/16

9:45 am-7:55 pm

1 stop7h 10m

$413

AtlantaOntario

ATL - ONT

ATLONT

Atlanta Hartsfield-Jackson

Sat 7/26

11:14 am-6:08 pm

2 stops9h 54m

Ontario

Fri 8/1

12:59 am-10:22 am

1 stop6h 23m

$424

AtlantaOntario

ATL - ONT

ATLONT

Atlanta Hartsfield-Jackson

Fri 8/29

7:32 pm-11:50 pm

1 stop7h 18m

$123

AtlantaOntario

ATL - ONT

ATLONT

Atlanta Hartsfield-Jackson

Tue 7/15

8:42 am-4:20 pm

1 stop10h 38m

$146

AtlantaOntario

ATL - ONT

ATLONT

Atlanta Hartsfield-Jackson

Thu 8/7

6:50 pm-10:55 pm

1 stop7h 05m

$149

AtlantaOntario

ATL - ONT

ATLONT

Atlanta Hartsfield-Jackson

Thu 8/7

11:35 am-10:52 pm

2 stops14h 17m

$154

AtlantaOntario

ATL - ONT

ATLONT

Atlanta Hartsfield-Jackson

Sat 8/9

6:30 am-1:26 pm

1 stop9h 56m

$158

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/10

Showing 1-10 of 14 results
1
2

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 June 9, 2025.

To ensure you get the cheapest price possible for a flight from Atlanta to Ontario, you should look to book at least 46 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 June 12, 2025.

Unlike in the morning, when flights are generally more expensive, you can save up to 15% 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 June 8, 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 June 12, 2025.

The most flights from ATL to ONT are scheduled on a Wednesday (10 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (2 on average).

Rainfall in Ontario by month

Plan your trip to Ontario by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Ontario ranges from 0.1 - 3.4 inches per month. February is typically the wettest month, when rainfall can reach 3.4 in. June is typically the driest time to visit Ontario when rainfall is around 0.1 in.

Temperature in Ontario by month

Plan your trip to Ontario by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Ontario, use this chart to help with planning. For those seeking warmer temperatures, August is the ideal time of year to visit, when temperatures reach an average of 78.8 F. Travelers looking to avoid the cold should look outside of December, when temperatures are typically at their lowest (around 53.6 F).

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 June 12, 2025.
Get a feel of what it's like to fly with Alaska Airlines, Southwest and Delta from Atlanta to Ontario by reading reviews from past customers. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.0
Very good
10,000 reviews

Food

7.1

Boarding

8.1

Comfort

7.8

Overall

8.0

Entertainment

7.1

Crew

8.5

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Alaska Airlines
8.0
Very good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Food

7.1

Boarding

8.1

Comfort

7.8

Overall

8.0

Entertainment

7.1

Crew

8.5

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Southwest
8.0
Very good
4,287 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Food

7.1

Boarding

8.1

Comfort

7.8

Overall

8.0

Entertainment

7.1

Crew

8.5

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Delta
8.0
Very good
7,950 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Food

7.1

Boarding

8.1

Comfort

7.8

Overall

8.0

Entertainment

7.1

Crew

8.5

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Hawaiian Airlines
7.9
Good
2,494 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Food

7.1

Boarding

8.1

Comfort

7.8

Overall

8.0

Entertainment

7.1

Crew

8.5

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
United Airlines
7.4
Good
8,790 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Food

7.1

Boarding

8.1

Comfort

7.8

Overall

8.0

Entertainment

7.1

Crew

8.5

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.

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 8 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 ($247), Alaska Airlines ($297), and United Airlines ($392) offers the cheapest pricing from Atlanta to Ontario. These flights start at 31% lower than the current average price 3 months from now.

  • What are the cheapest airlines to fly from Atlanta to Ontario one-way?

    The cheapest airline one-way is Frontier, with whom users have recently found tickets for as low as $123. However, be on the lookout for offers from Southwest and Hawaiian Airlines, as they are both options that can get you from Atlanta to Ontario for a low price.

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

    The top 3 most reliable airlines when flying from Atlanta to Ontario are WestJet (89%), Delta (74%) and KLM (69%).

  • What are the cheapest flights from Atlanta to Ontario?

    Looking at all options, your cheapest flight can be booked for $298. While the most popular route (Atlanta Hartsfield-Jackson - Ontario) can be booked for $253 on average our data indicates $414 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.

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Alternative routes for Atlanta 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 2,558,603 searches. Data last updated June 12, 2025.
AirlineCheapestAverageFlexibilityOn-time
Spirit AirlinesCheapest$131Average$268FlexibilityNo cancel feeOn-time65%
FrontierCheapest$131Average$230FlexibilityNo cancel feeOn-time62%
DeltaCheapest$239Average$478FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$258Average$415FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$318Average$418FlexibilityNo cancel feeOn-time63%

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