What’s the top layover airport for flights from Atlanta to Ontario?

Las Vegas (LAS) – chosen by Cheapflights users on 62% of 1-stop itineraries from Atlanta to Ontario on Cheapflights.

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.

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’s the fastest layover option from Atlanta to Ontario?

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?

Flights via Austin (AUS) offer the fastest connection on this route, with an average layover time of 1h 35m.

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’s the cheapest layover airport for flights from Atlanta to Ontario?

Dallas (DFW) is the most affordable 1-stop option, with an average round-trip price of $153.

How long is the flight from Atlanta to Ontario?

There are many flights that can get you from Atlanta to Ontario in 10h 18m. Fly via Frontier, Alaska Airlines, or Southwest to get the fastest option. Atlanta and Ontario are separated by a distance of 1894 mi. This flight may include one or multiple stops.

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

According to our current data, Frontier ($133), American Airlines ($280), and Delta ($299) offers the cheapest pricing from Atlanta to Ontario. These flights start at 63% 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 $71. However, be on the lookout for offers from Spirit Airlines and American Airlines, as they are both options that can get you from Atlanta to Ontario for a low price.

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.

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).

What are the cheapest flights from Atlanta to Ontario?

Looking at all options, your cheapest flight can be booked for $348. While the most popular route (Atlanta Hartsfield-Jackson - Ontario) can be booked for $149 on average, our data indicates $459 when flying from Atlanta to Ontario.

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 (77%), KLM (76%) and Delta (75%).

What are the most popular airlines that fly from Atlanta to Ontario?

The most popular airlines flying from Atlanta to Ontario are Frontier, Delta and Southwest. Something to consider prior to booking your flight.

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.

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 39m 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.

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.

$66+ Flights from Atlanta to Ontario

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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.

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Cheapflights Tip: The best prices from Atlanta Hartsfield-Jackson to Ontario are usually found in October or June, booked 35 days in advance, depart on a Tuesday or Thursday and return on a Tuesday

Cheap 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 December 17, 2025.

Sat 12/209:15 pmATL - ONT

1 stop13h 09mFrontier

Sat 1/107:00 amONT - ATL

1 stop25h 07mFrontier

Deal found 12/14

$217

Mon 12/229:15 pmATL - ONT

1 stop13h 09mFrontier

Sat 1/107:00 amONT - ATL

1 stop25h 07mFrontier

Deal found 12/16

$237

Thu 12/256:40 amATL - ONT

1 stop11h 41mFrontier

Wed 12/316:00 amONT - ATL

1 stop20h 30mFrontier

Deal found 12/16

$253

Thu 12/256:40 amATL - ONT

1 stop11h 41mFrontier

Tue 12/308:19 amONT - ATL

1 stop9h 59mFrontier

Deal found 12/16

$258

Thu 12/256:40 amATL - ONT

1 stop11h 41mFrontier

Mon 12/296:00 pmONT - ATL

1 stop16h 47mFrontier

Deal found 12/16

$259

Wed 12/319:15 pmATL - ONT

1 stop14h 38mMultiple Airlines

Tue 1/67:52 amONT - ATL

1 stop7h 18mMultiple Airlines

Deal found 12/16

$260

Thu 12/256:40 amATL - ONT

1 stop11h 41mFrontier

Thu 1/19:48 amONT - ATL

1 stop8h 30mFrontier

Deal found 12/16

$278

Sat 12/209:15 pmATL - ONT

1 stop13h 09mFrontier

Tue 12/306:17 pmONT - ATL

1 stop8h 13mFrontier

Deal found 12/15

$284

Best flights from Atlanta to Ontario
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 December 17, 2025.

Fri 1/27:59 pmATL - ONT

1 stop23h 32mFrontier

Sun 1/183:23 pmONT - ATL

1 stop26h 16mFrontier

Deal found 12/16

$273

Tue 2/107:50 amATL - ONT

1 stop10h 18mAlaska Airlines

Tue 2/176:14 amONT - ATL

1 stop20h 29mAlaska Airlines

Deal found 12/15

$306

Sun 2/1512:40 pmATL - ONT

2 stops10h 50mSouthwest

Wed 2/1811:15 amONT - ATL

2 stops7h 15mSouthwest

Deal found 12/16

$396

Thu 2/1910:10 amATL - ONT

Nonstop4h 52mDelta

Sun 2/2210:20 pmONT - ATL

Nonstop4h 08mDelta

Deal found 12/17

$399

Sat 12/209:15 pmATL - ONT

1 stop13h 09mFrontier

Mon 12/226:45 amONT - ATL

1 stop19h 43mFrontier

Deal found 12/16

$364

Sat 1/317:18 pmATL - ONT

Nonstop4h 47mDelta

Mon 2/210:30 pmONT - ATL

Nonstop4h 05mDelta

Deal found 12/16

$399

Fri 1/307:18 pmATL - ONT

Nonstop4h 47mDelta

Fri 2/610:30 pmONT - ATL

Nonstop4h 05mDelta

Deal found 12/16

$399

Tue 1/209:41 amATL - ONT

Nonstop4h 50mDelta

Mon 1/2610:30 pmONT - ATL

Nonstop4h 05mDelta

Deal found 12/14

$399

Sat 1/179:41 amATL - ONT

Nonstop4h 50mDelta

Fri 1/2312:41 pmONT - ATL

Nonstop4h 09mDelta

Deal found 12/16

$399

Wed 2/1810:10 amATL - ONT

Nonstop4h 52mDelta

Sun 2/2210:20 pmONT - ATL

Nonstop4h 08mDelta

Deal found 12/16

$399

Sat 2/2810:10 amATL - ONT

Nonstop4h 52mDelta

Sun 3/810:30 pmONT - ATL

Nonstop4h 04mDelta

Deal found 12/15

$399

Sat 1/319:41 amATL - ONT

Nonstop4h 50mDelta

Tue 2/310:30 pmONT - ATL

Nonstop4h 05mDelta

Deal found 12/16

$399

Last-minute flights from Atlanta to Ontario
Discover last-minute flight deals from Atlanta to Ontario. Data last updated December 17, 2025 and is based on user searches.

Thu 1/16:40 amATL - ONT

1 stop11h 41mFrontier

Tue 1/136:49 pmONT - ATL

1 stop8h 08mFrontier

Deal found 12/15

$166

Thu 1/16:40 amATL - ONT

1 stop11h 41mFrontier

Sat 1/107:00 amONT - ATL

1 stop25h 07mFrontier

Deal found 12/15

$167

Tue 1/67:00 amATL - ONT

1 stop11h 09mFrontier

Tue 1/136:49 pmONT - ATL

1 stop8h 08mFrontier

Deal found 12/15

$148

Mon 1/123:24 pmATL - ONT

1 stop8h 59mFrontier

Wed 1/213:07 pmONT - ATL

1 stop12h 56mFrontier

Deal found 12/16

$165

Thu 1/157:46 pmATL - ONT

1 stop7h 13mFrontier

Thu 1/298:48 pmONT - ATL

1 stop7h 15mFrontier

Deal found 12/15

$149

Fri 1/168:00 pmATL - ONT

1 stop29h 59mFrontier

Mon 1/193:23 pmONT - ATL

1 stop16h 43mFrontier

Deal found 12/15

$170

Sat 1/179:15 pmATL - ONT

1 stop19h 33mFrontier

Fri 1/236:20 amONT - ATL

1 stop25h 51mFrontier

Deal found 12/16

$147

Sat 1/1710:42 amATL - ONT

1 stop15h 17mFrontier

Sat 1/247:15 amONT - ATL

1 stop24h 56mFrontier

Deal found 12/15

$160

Sat 1/179:06 amATL - ONT

2 stops16h 53mMultiple Airlines

Fri 1/236:20 amONT - ATL

1 stop25h 51mMultiple Airlines

Deal found 12/16

$172

Mon 1/198:00 pmATL - ONT

1 stop6h 59mFrontier

Thu 1/298:48 pmONT - ATL

1 stop7h 15mFrontier

Deal found 12/16

$150

Wed 1/219:15 pmATL - ONT

1 stop20h 12mFrontier

Mon 1/266:20 amONT - ATL

1 stop27h 16mFrontier

Deal found 12/16

$164

Wed 1/215:34 amATL - ONT

2 stops31h 35mMultiple Airlines

Mon 1/266:20 amONT - ATL

1 stop27h 16mMultiple Airlines

Deal found 12/16

$174

One-way flights from Atlanta to Ontario
Search for one-way flight options from Atlanta to Ontario. Find affordable one-way fares based on user searches. Data last updated December 17, 2025.

Tue 1/2710:40 amATL - ONT

1 stop7h 27mFrontier

Deal found 12/16

$66

Tue 2/2410:15 amATL - ONT

1 stop14h 19mFrontier

Deal found 12/17

$67

Wed 3/46:00 amATL - ONT

1 stop18h 34mFrontier

Deal found 12/17

$72

Tue 3/38:00 pmATL - ONT

1 stop28h 34mFrontier

Deal found 12/15

$73

Tue 2/310:40 amATL - ONT

1 stop7h 27mFrontier

Deal found 12/16

$74

Tue 1/2010:40 amATL - ONT

1 stop7h 27mFrontier

Deal found 12/16

$75

Thu 1/157:46 pmATL - ONT

1 stop7h 13mFrontier

Deal found 12/15

$76

Wed 2/187:55 pmATL - ONT

1 stop16h 39mFrontier

Deal found 12/17

$78

Sat 1/318:59 pmATL - ONT

1 stop15h 19mFrontier

Deal found 12/17

$79

Sat 2/78:59 pmATL - ONT

1 stop19h 54mFrontier

Deal found 12/16

$80

Wed 1/146:01 pmATL - ONT

1 stop16h 06mFrontier

Deal found 12/15

$81

Find flight deals from Atlanta to Ontario

Most accurate provider	CheapOair 3 stars
Most trusted provider	CheapOair 3 stars
Round-trip from	$147 (Kiwi.com)
One-way from	$66 (WAYA)
Popular in	December
Cheapest in	October
Average price	$469
Good round-trip deal	$469 or less
Good one-way deal	$398 or less

Provider with most accurate pricing for Atlanta Hartsfield-Jackson-Ontario flight deals.

Search Deals

Provider most trusted by Cheapflights users for Atlanta Hartsfield-Jackson-Ontario flights.

Search Deals

From Atlanta Hartsfield-Jackson to Ontario

Search Deals

One-way flight from Atlanta Hartsfield-Jackson to Ontario

Search Deals

Highest demand for flights based on searches. 8% potential increase in price ($32 potential increase over avg. RT price).

Search Deals

Cheapest flight prices on average. 2% potential price decrease ($10 potential savings vs. average RT price).

Search Deals

Average for round-trip flights in December 2025

Search Deals

Price to beat on a round-trip flight from Atlanta Hartsfield-Jackson to Ontario.

Search Deals

Price to beat on a one-way flight from Atlanta Hartsfield-Jackson to Ontario.

Search Deals

Fly from

Fly to

Route

Depart

Return

Price

AtlantaOntario

ATL - ONT

ATLONT

Atlanta Hartsfield-Jackson

Fri 1/2

7:59 pm-4:31 pm

1 stop23h 32m

Ontario

Sun 1/18

3:23 pm-8:39 pm

1 stop26h 16m

$273

AtlantaOntario

ATL - ONT

ATLONT

Atlanta Hartsfield-Jackson

Tue 2/10

7:50 am-3:08 pm

1 stop10h 18m

Ontario

Tue 2/17

6:14 am-5:43 am

1 stop20h 29m

$306

AtlantaOntario

ATL - ONT

ATLONT

Atlanta Hartsfield-Jackson

Sat 12/20

9:15 pm-7:24 am

1 stop13h 09m

Ontario

Mon 12/22

6:45 am-5:28 am

1 stop19h 43m

$364

AtlantaOntario

ATL - ONT

ATLONT

Atlanta Hartsfield-Jackson

Sun 2/15

12:40 pm-8:30 pm

2 stops10h 50m

Ontario

Wed 2/18

11:15 am-9:30 pm

2 stops7h 15m

$396

AtlantaOntario

ATL - ONT

ATLONT

Atlanta Hartsfield-Jackson

Thu 2/19

10:10 am-12:02 pm

Nonstop4h 52m

Ontario

Sun 2/22

10:20 pm-5:28 am

Nonstop4h 08m

$399

AtlantaOntario

ATL - ONT

ATLONT

Atlanta Hartsfield-Jackson

Sat 1/31

7:18 pm-9:05 pm

Nonstop4h 47m

Ontario

Mon 2/2

10:30 pm-5:35 am

Nonstop4h 05m

$399

AtlantaOntario

ATL - ONT

ATLONT

Atlanta Hartsfield-Jackson

Fri 1/30

7:18 pm-9:05 pm

Nonstop4h 47m

Ontario

Fri 2/6

10:30 pm-5:35 am

Nonstop4h 05m

$399

AtlantaOntario

ATL - ONT

ATLONT

Atlanta Hartsfield-Jackson

Tue 1/20

9:41 am-11:31 am

Nonstop4h 50m

Ontario

Mon 1/26

10:30 pm-5:35 am

Nonstop4h 05m

$399

AtlantaOntario

ATL - ONT

ATLONT

Atlanta Hartsfield-Jackson

Sat 1/17

9:41 am-11:31 am

Nonstop4h 50m

Ontario

Fri 1/23

12:41 pm-7:50 pm

Nonstop4h 09m

$399

AtlantaOntario

ATL - ONT

ATLONT

Atlanta Hartsfield-Jackson

Wed 2/18

10:10 am-12:02 pm

Nonstop4h 52m

Ontario

Sun 2/22

10:20 pm-5:28 am

Nonstop4h 08m

$399

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/15

Showing 1-10 of 23 results

Compare providers for flights from Atlanta to Ontario

Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Atlanta to Ontario in December.

Provider	Price Accuracy	Trust Score*
Expedia	Price Accuracy2 stars	Trust Score*3 stars
FlightHub	Price Accuracy3 stars	Trust Score*1 star
eDreams	Price Accuracy3 stars	Trust Score*3 stars
JustAirTicket	Price Accuracy-	Trust Score*1 star
Cheapfaremart	Price Accuracy-	Trust Score*1 star
Cheapflightsfares	Price Accuracy3 stars	Trust Score*2 stars
Priceline	Price Accuracy1 star	Trust Score*3 stars
CheapOair	Price Accuracy3 stars	Trust Score*3 stars
Kiwi.com	Price Accuracy3 stars	Trust Score*3 stars
Justfly.com	Price Accuracy3 stars	Trust Score*3 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

Prices

Delays

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 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, February is the cheapest month in which you can book a flight from Atlanta to Ontario (average of $78). 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?

Unlike in the afternoon, when flights are generally more expensive, you can save up to 24% on flights from Atlanta to Ontario by exploring options for tickets at noon.

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

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

Reviews of airlines servicing Ontario

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.

Southwest

7.9

Good

4,250 reviews

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

7.9

Good

4,250 reviews

Southwest

7.9

Good

4,250 reviews

Reviews

1 / 20

8.0

Excellent

Walter,Aug 2025

OAK - SAN

Delta

7.9

Good

8,008 reviews

Southwest

7.9

Good

4,250 reviews

Reviews

1 / 20

8.0

Excellent

Walter,Aug 2025

OAK - SAN

United Airlines

7.4

Good

9,092 reviews

Southwest

7.9

Good

4,250 reviews

Reviews

1 / 20

8.0

Excellent

Walter,Aug 2025

OAK - SAN

American Airlines

7.2

Good

11,049 reviews

Southwest

7.9

Good

4,250 reviews

Reviews

1 / 20

8.0

Excellent

Walter,Aug 2025

OAK - SAN

Frontier

5.8

Fair

3,082 reviews

Southwest

7.9

Good

4,250 reviews

Reviews

1 / 20

8.0

Excellent

Walter,Aug 2025

OAK - SAN

Related info for your journey

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 39m 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 long is the flight from Atlanta to Ontario?
There are many flights that can get you from Atlanta to Ontario in 10h 18m. Fly via Frontier, Alaska Airlines, or Southwest to get the fastest option. Atlanta and Ontario are separated by a distance of 1894 mi. This flight may include one or multiple stops.
What are the cheapest airlines flying from Atlanta to Ontario round-trip?
According to our current data, Frontier ($133), American Airlines ($280), and Delta ($299) offers the cheapest pricing from Atlanta to Ontario. These flights start at 63% 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 $71. However, be on the lookout for offers from Spirit Airlines and American 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 LATAM Airlines (77%), KLM (76%) and Delta (75%).
What are the cheapest flights from Atlanta to Ontario?
Looking at all options, your cheapest flight can be booked for $348. While the most popular route (Atlanta Hartsfield-Jackson - Ontario) can be booked for $149 on average, our data indicates $459 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, February is the cheapest month in which you can book a flight from Atlanta to Ontario (average of $78). 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.

See more FAQs

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Other flights to Ontario

Top 5 airlines flying from Atlanta to Ontario

Airline	Cheapest	Average	Flexibility	On-time
Frontier	Cheapest$137	Average$208	FlexibilityNo cancel fee	On-time62%
American Airlines	Cheapest$280	Average$415	FlexibilityNo cancel fee	On-time71%
Delta	Cheapest$299	Average$499	FlexibilityNo cancel fee	On-timeN/A
Southwest	Cheapest$330	Average$416	FlexibilityNo cancel fee	On-time63%
United Airlines	Cheapest$338	Average$428	FlexibilityNo cancel fee	On-time69%

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$66+ 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 1/27. Fares are subject to change and may not be available on all flights or dates of travel.

Find cheap flights from Atlanta to Ontario with Cheapflights

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 October or June, booked 35 days in advance, depart on a Tuesday or Thursday and return on a Tuesday

Cheap 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 December 17, 2025.

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 December 17, 2025.

Find flight deals from Atlanta to Ontario

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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 December.

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.

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?

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Which airline has the best punctuality record on Atlanta to Ontario flights?

What’s the top layover airport for flights from Atlanta to Ontario?

What’s the cheapest layover airport for flights from Atlanta to Ontario?

What’s the fastest layover option from Atlanta to Ontario?

Which airport typically offers the quickest layover for flights from Atlanta to Ontario?

Reviews of airlines servicing Ontario

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.

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?

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

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

What are the most reliable airlines from Atlanta to Ontario?

What are the cheapest flights from Atlanta to Ontario?

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

How can I find direct flights from Atlanta to Ontario?

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

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

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Alternative routes for Atlanta to Ontario

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Top 5 airlines flying from Atlanta to Ontario

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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 December 17, 2025.