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Ontario

$99+ 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 6/10. Fares are subject to change and may not be available on all flights or dates of travel.
ATL — ONT
May 21 — May 281
Wed 5/21
Wed 5/28
1 adult, Economy
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1. Tell us where you want to go

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Cheapflights Tip: The best prices from Atlanta Hartsfield-Jackson to Ontario are usually found in February or September, booked 65 days in advance, depart on a Thursday or Saturday and return on a Wednesday

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 May 16, 2025.

Most accurate provider

CheapOair
3 stars

Most trusted provider

CheapOair
3 stars

Round-trip from

$236
(Frontier)

One-way from

$99
(Frontier)

Popular in

July

Cheapest in

February

Average price

$399

Good round-trip deal

$429 or less

Good one-way deal

$298 or less
Provider with most accurate pricing for Atlanta Hartsfield-Jackson-Ontario flight deals.
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Provider most trusted by Cheapflights users for Atlanta Hartsfield-Jackson-Ontario flights.
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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 ($26 potential increase over avg. RT price).
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Cheapest flight prices on average. 1% potential price decrease ($6 potential savings vs. average RT price).
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Average for round-trip flights in May 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 May 16, 2025.

This Frontier deal was found by Cheapflights users on 5/15. 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 6/157:54 pmATL - ONT
1 stop6h 56mFrontier
Tue 6/177:00 amONT - ATL
1 stop10h 24mFrontier
Deal found 5/15$236
This Alaska Airlines deal was found by Cheapflights users on 5/15. 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 9/67:00 amATL - ONT
1 stop10h 09mAlaska Airlines
Wed 9/107:22 pmONT - ATL
1 stop9h 31mAlaska Airlines
Deal found 5/15$331
This Southwest deal was found by Cheapflights users on 5/15. 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 10/22:05 pmATL - ONT
2 stops8h 45mSouthwest
Mon 10/68:40 pmONT - ATL
1 stop6h 25mSouthwest
Deal found 5/15$383
This Delta deal was found by Cheapflights users on 5/15. 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 6/149:15 amATL - ONT
Nonstop4h 23mDelta
Sat 6/2111:49 amONT - ATL
Nonstop4h 20mDelta
Deal found 5/15$399
This American Airlines deal was found by Cheapflights users on 5/16. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 7/124:22 pmATL - ONT
2 stops8h 16mAmerican Airlines
Thu 7/176:10 amONT - ATL
1 stop8h 32mAmerican Airlines
Deal found 5/16$422

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 May 16, 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 6/15

7:54 pm-11:50 pm

1 stop6h 56m

Ontario

Tue 6/17

7:00 am-8:24 pm

1 stop10h 24m

$236

AtlantaOntario

ATL - ONT

ATLONT

Atlanta Hartsfield-Jackson

Tue 8/12

6:30 am-1:26 pm

1 stop9h 56m

Ontario

Tue 8/12

6:58 pm-7:49 am

1 stop9h 51m

$323

AtlantaOntario

ATL - ONT

ATLONT

Atlanta Hartsfield-Jackson

Thu 7/17

2:45 pm-8:00 pm

2 stops8h 15m

Ontario

Tue 7/29

8:10 pm-6:05 am

1 stop6h 55m

$375

AtlantaOntario

ATL - ONT

ATLONT

Atlanta Hartsfield-Jackson

Sat 6/14

9:15 am-10:38 am

Nonstop4h 23m

Ontario

Mon 6/16

10:05 pm-5:17 am

Nonstop4h 12m

$399

AtlantaOntario

ATL - ONT

ATLONT

Atlanta Hartsfield-Jackson

Sat 7/12

11:14 am-6:08 pm

2 stops9h 54m

Ontario

Thu 7/17

11:59 pm-10:22 am

1 stop7h 23m

$422

AtlantaOntario

ATL - ONT

ATLONT

Atlanta Hartsfield-Jackson

Tue 6/17

8:30 am-9:04 pm

2 stops15h 34m

Ontario

Wed 6/18

5:10 am-6:00 am

1 stop21h 50m

$498

AtlantaOntario

ATL - ONT

ATLONT

Atlanta Hartsfield-Jackson

Tue 6/10

10:28 am-8:51 pm

1 stop13h 23m

$99

AtlantaOntario

ATL - ONT

ATLONT

Atlanta Hartsfield-Jackson

Sun 8/31

5:30 am-12:32 pm

2 stops10h 02m

$159

AtlantaOntario

ATL - ONT

ATLONT

Atlanta Hartsfield-Jackson

Wed 6/11

5:56 pm-11:57 pm

1 stop9h 01m

$162

AtlantaOntario

ATL - ONT

ATLONT

Atlanta Hartsfield-Jackson

Tue 8/5

12:20 pm-5:30 pm

2 stops8h 10m

$167

Flights are sorted by cheapest round-trip flights first.

Deals found on 5/14

Showing 1-10 of 13 results
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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 May.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*2 stars
JustAirTicketPrice Accuracy-Trust Score*3 stars
eDreamsPrice Accuracy3 starsTrust Score*3 stars
PricelinePrice Accuracy2 starsTrust Score*3 stars
CheapfaremartPrice Accuracy-Trust Score*1 star
CheapOairPrice Accuracy3 starsTrust Score*3 stars
Kiwi.comPrice Accuracy3 starsTrust Score*3 stars
Justfly.comPrice Accuracy3 starsTrust Score*2 stars
CheapflightsfaresPrice Accuracy3 starsTrust Score*2 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • 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

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 May 9, 2025.

To ensure you get the cheapest price possible for a flight from Atlanta to Ontario, you should look to book at least 35 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 May 16, 2025.

Unlike in the morning, when flights are generally more expensive, you can save up to 16% 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 May 11, 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 May 16, 2025.

The most flights from ATL to ONT are scheduled on a Monday (9 on average). You will have fewer flight options on Tuesday, which is when the least amount of flights are scheduled (5 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 May 16, 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

Comfort

7.9

Overall

8.0

Crew

8.5

Entertainment

7.1

Boarding

8.1

Food

7.1

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

Comfort

7.9

Overall

8.0

Crew

8.5

Entertainment

7.1

Boarding

8.1

Food

7.1

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
4,291 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Comfort

7.9

Overall

8.0

Crew

8.5

Entertainment

7.1

Boarding

8.1

Food

7.1

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
7,946 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Comfort

7.9

Overall

8.0

Crew

8.5

Entertainment

7.1

Boarding

8.1

Food

7.1

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
2,437 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Comfort

7.9

Overall

8.0

Crew

8.5

Entertainment

7.1

Boarding

8.1

Food

7.1

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
8,730 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Comfort

7.9

Overall

8.0

Crew

8.5

Entertainment

7.1

Boarding

8.1

Food

7.1

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 7 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 ($236), Alaska Airlines ($339), and Southwest ($391) offers the cheapest pricing from Atlanta to Ontario. These flights start at 37% 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 $99. However, be on the lookout for offers from United Airlines 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 (88%), Delta (78%) and KLM (74%).

  • 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 $180 on average our data indicates $574 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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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 May 16, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$129Average$247FlexibilityNo cancel feeOn-time62%
Spirit AirlinesCheapest$131Average$268FlexibilityNo cancel feeOn-time65%
DeltaCheapest$239Average$482FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$258Average$420FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$318Average$421FlexibilityNo cancel feeOn-time63%

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