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 day of the week experiences the fewest flight delays on this route?

Saturday tends to have the lowest number of delays on this route, whereas Tuesday has historically faced a higher average of delays compared to other days of the week.

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.

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

Las Vegas (LAS) – chosen by Cheapflights users on 70% of 1-stop itineraries from Atlanta to Ontario on Cheapflights.

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

Over the last year, WestJet have had the lowest number of delays on this route, with just 9% of flights being delayed.

How often are flights from Atlanta to Ontario delayed?

About 22% of weekly flights between Atlanta and Ontario have experienced delays in the past year, with the average delay time being 138 minutes.

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 6h 50m. Fly via Frontier to get the fastest option. Atlanta and Ontario are separated by a distance of 1894 mi.

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

According to our current data, Spirit Airlines ($130), Frontier ($137), and American Airlines ($280) offers the cheapest pricing from Atlanta to Ontario. These flights start at 64% lower than the current average price 3 months from now.

Weekly flight availability from Atlanta to Ontario

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

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 $299. While the most popular route (Atlanta Hartsfield-Jackson - Ontario) can be booked for $146 on average, our data indicates $534 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 (85%), Air France (84%) and Delta (82%).

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 FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Atlanta-Ontario flight deals on Cheapflights vs. FlightHub >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 FlightHub the most. FlightHub 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 29m 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 6 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.

$56+ Cheap Flights from Atlanta to Ontario

Q: How much does it cost to fly round-trip from Atlanta to Ontario?

Airfare is below average for this route at the moment. Atlanta to Ontario flights typically cost between $242 and $487 in December. The cheapest round-trip price found within the last 3 days was $165 on Frontier (Dec 10-Dec 14).

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

Cheap flight deals from Atlanta to Ontario

Most accurate provider	FlightHub 3 stars
Most trusted provider	FlightHub 3 stars
Round-trip from	$165 (Kiwi.com)
One-way from	$56 (Kiwi.com)
Popular in	December
Cheapest in	June
Average price	$299
Good round-trip deal	$319 or less
Good one-way deal	$648 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. 6% potential increase in price ($24 potential increase over avg. RT price).

Search Deals

Cheapest flight prices on average. 1% potential price decrease ($7 potential savings vs. average RT price).

Search Deals

Average for round-trip flights in October 2025

Search Deals

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 October 23, 2025.

Wed 12/109:10 pmATL - ONT

1 stop24h 25mFrontier

Sun 12/144:01 pmONT - ATL

1 stop11h 12mFrontier

Deal found 10/22

$165

Tue 11/412:15 pmATL - ONT

1 stop12h 12mFrontier

Thu 11/67:44 pmONT - ATL

1 stop6h 31mFrontier

Deal found 10/21

$168

Thu 10/306:00 amATL - ONT

1 stop28h 29mFrontier

Wed 11/198:45 amONT - ATL

1 stop8h 10mFrontier

Deal found 10/21

$169

Wed 11/512:15 pmATL - ONT

1 stop12h 12mFrontier

Thu 11/1310:05 amONT - ATL

1 stop6h 57mFrontier

Deal found 10/22

$170

Mon 11/177:30 amATL - ONT

1 stop19h 20mFrontier

Thu 11/206:30 amONT - ATL

1 stop20h 32mFrontier

Deal found 10/20

$171

Wed 12/312:43 pmATL - ONT

1 stop11h 34mFrontier

Mon 12/85:18 pmONT - ATL

1 stop8h 53mFrontier

Deal found 10/21

$172

Tue 11/412:15 pmATL - ONT

1 stop12h 12mFrontier

Sat 11/86:53 amONT - ATL

1 stop7h 30mFrontier

Deal found 10/22

$174

Sat 12/137:20 amATL - ONT

2 stops16h 57mMultiple Airlines

Fri 1/95:13 pmONT - ATL

1 stop9h 44mMultiple Airlines

Deal found 10/21

$178

Thu 10/306:00 amATL - ONT

1 stop28h 29mFrontier

Tue 11/188:45 amONT - ATL

1 stop8h 10mFrontier

Deal found 10/21

$180

Sun 11/27:30 amATL - ONT

1 stop6h 40mFrontier

Tue 11/188:45 amONT - ATL

1 stop8h 10mFrontier

Deal found 10/21

$182

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 October 23, 2025.

Fri 11/78:00 pmATL - ONT

1 stop6h 50mFrontier

Sun 11/96:45 amONT - ATL

1 stop20h 17mFrontier

Deal found 10/22

$236

Thu 12/116:52 amATL - ONT

1 stop14h 41mAlaska Airlines

Sun 12/146:00 amONT - ATL

1 stop14h 59mAlaska Airlines

Deal found 10/22

$366

Thu 12/113:35 pmATL - ONT

2 stops8h 10mSouthwest

Mon 12/159:55 amONT - ATL

2 stops9h 25mSouthwest

Deal found 10/22

$374

Tue 12/95:56 pmATL - ONT

Nonstop4h 43mDelta

Tue 12/1612:12 pmONT - ATL

Nonstop4h 08mDelta

Deal found 10/22

$399

Wed 11/1912:15 pmATL - ONT

1 stop12h 12mFrontier

Wed 11/266:31 pmONT - ATL

1 stop11h 52mFrontier

Deal found 10/22

$237

Tue 12/1610:39 amATL - ONT

1 stop13h 38mFrontier

Wed 12/316:20 pmONT - ATL

1 stop11h 58mFrontier

Deal found 10/22

$252

Thu 11/136:00 amATL - ONT

1 stop7h 34mFrontier

Sat 11/2212:58 amONT - ATL

1 stop26h 04mFrontier

Deal found 10/23

$269

Mon 12/297:59 pmATL - ONT

1 stop24h 23mFrontier

Mon 1/56:45 amONT - ATL

1 stop20h 28mFrontier

Deal found 10/22

$276

Sat 12/204:15 pmATL - ONT

2 stops10h 40mSouthwest

Thu 12/259:55 amONT - ATL

2 stops9h 20mSouthwest

Deal found 10/22

$393

Fri 12/129:16 amATL - ONT

Nonstop4h 46mDelta

Wed 12/1710:25 pmONT - ATL

Nonstop4h 10mDelta

Deal found 10/22

$399

Fri 11/217:42 amATL - ONT

1 stop9h 44mFrontier

Mon 11/247:06 pmONT - ATL

1 stop7h 49mFrontier

Deal found 10/23

$322

Sun 10/267:30 amATL - ONT

1 stop29h 05mFrontier

Thu 10/3010:05 amONT - ATL

1 stop6h 57mFrontier

Deal found 10/22

$331

Last-minute flights from Atlanta to Ontario
Discover last-minute flight deals from Atlanta to Ontario. Data last updated October 23, 2025 and is based on user searches.

Thu 10/306:00 amATL - ONT

1 stop28h 29mFrontier

Wed 11/198:45 amONT - ATL

1 stop8h 10mFrontier

Deal found 10/21

$169

Thu 10/306:00 amATL - ONT

1 stop28h 29mFrontier

Tue 11/188:45 amONT - ATL

1 stop8h 10mFrontier

Deal found 10/21

$180

Sun 11/27:30 amATL - ONT

1 stop6h 40mFrontier

Tue 11/188:45 amONT - ATL

1 stop8h 10mFrontier

Deal found 10/21

$182

Mon 11/37:54 pmATL - ONT

1 stop27h 48mFrontier

Mon 11/101:46 pmONT - ATL

1 stop18h 20mFrontier

Deal found 10/20

$172

Mon 11/38:00 pmATL - ONT

1 stop28h 27mFrontier

Wed 11/58:45 amONT - ATL

1 stop8h 10mFrontier

Deal found 10/22

$186

Tue 11/412:15 pmATL - ONT

1 stop12h 12mFrontier

Thu 11/67:44 pmONT - ATL

1 stop6h 31mFrontier

Deal found 10/21

$168

Tue 11/412:15 pmATL - ONT

1 stop12h 12mFrontier

Sat 11/86:53 amONT - ATL

1 stop7h 30mFrontier

Deal found 10/22

$174

Wed 11/512:15 pmATL - ONT

1 stop12h 12mFrontier

Thu 11/1310:05 amONT - ATL

1 stop6h 57mFrontier

Deal found 10/22

$170

Mon 11/177:30 amATL - ONT

1 stop19h 20mFrontier

Thu 11/206:30 amONT - ATL

1 stop20h 32mFrontier

Deal found 10/20

$171

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 October 23, 2025.

Tue 2/1010:55 amATL - ONT

1 stop13h 22mFrontier

Deal found 10/21

$56

Tue 1/134:38 pmATL - ONT

1 stop24h 55mFrontier

Deal found 10/22

$57

Sun 2/18:36 pmATL - ONT

1 stop27h 41mFrontier

Deal found 10/23

$62

Wed 2/48:43 amATL - ONT

1 stop16h 56mFrontier

Deal found 10/23

$63

Sun 1/1110:43 amATL - ONT

1 stop16h 16mFrontier

Deal found 10/23

$67

Fri 1/97:59 pmATL - ONT

1 stop27h 14mFrontier

Deal found 10/23

$68

Wed 11/125:02 pmATL - ONT

1 stop28h 47mFrontier

Deal found 10/22

$69

Mon 12/157:20 amATL - ONT

1 stop12h 13mMultiple Airlines

Deal found 10/23

$73

Sat 12/137:20 amATL - ONT

1 stop10h 05mFrontier

Deal found 10/22

$74

Thu 12/47:59 pmATL - ONT

1 stop28h 18mFrontier

Deal found 10/21

$75

Wed 12/312:43 pmATL - ONT

1 stop11h 34mFrontier

Deal found 10/21

$77

Fri 12/127:19 amATL - ONT

1 stop8h 51mMultiple Airlines

Deal found 10/22

$78

Fly from

Fly to

Route

Depart

Return

Price

AtlantaOntario

ATL - ONT

ATLONT

Atlanta Hartsfield-Jackson

Fri 11/7

8:00 pm-11:50 pm

1 stop6h 50m

Ontario

Sun 11/9

6:45 am-6:02 am

1 stop20h 17m

$236

AtlantaOntario

ATL - ONT

ATLONT

Atlanta Hartsfield-Jackson

Wed 11/19

12:15 pm-9:27 pm

1 stop12h 12m

Ontario

Wed 11/26

6:31 pm-9:23 am

1 stop11h 52m

$237

AtlantaOntario

ATL - ONT

ATLONT

Atlanta Hartsfield-Jackson

Tue 12/16

10:39 am-9:17 pm

1 stop13h 38m

Ontario

Wed 12/31

6:20 pm-9:18 am

1 stop11h 58m

$252

AtlantaOntario

ATL - ONT

ATLONT

Atlanta Hartsfield-Jackson

Thu 11/13

6:00 am-10:34 am

1 stop7h 34m

Ontario

Sat 11/22

12:58 am-6:02 am

1 stop26h 04m

$269

AtlantaOntario

ATL - ONT

ATLONT

Atlanta Hartsfield-Jackson

Mon 12/29

7:59 pm-5:22 pm

1 stop24h 23m

Ontario

Mon 1/5

6:45 am-6:13 am

1 stop20h 28m

$276

AtlantaOntario

ATL - ONT

ATLONT

Atlanta Hartsfield-Jackson

Fri 11/21

7:42 am-2:26 pm

1 stop9h 44m

Ontario

Mon 11/24

7:06 pm-5:55 am

1 stop7h 49m

$322

AtlantaOntario

ATL - ONT

ATLONT

Atlanta Hartsfield-Jackson

Sun 10/26

7:30 am-9:35 am

1 stop29h 05m

Ontario

Thu 10/30

10:05 am-8:02 pm

1 stop6h 57m

$331

AtlantaOntario

ATL - ONT

ATLONT

Atlanta Hartsfield-Jackson

Thu 12/11

6:52 am-6:33 pm

1 stop14h 41m

Ontario

Sun 12/14

6:00 am-11:59 pm

1 stop14h 59m

$366

AtlantaOntario

ATL - ONT

ATLONT

Atlanta Hartsfield-Jackson

Thu 12/11

3:35 pm-8:45 pm

2 stops8h 10m

Ontario

Mon 12/15

9:55 am-10:20 pm

2 stops9h 25m

$374

AtlantaOntario

ATL - ONT

ATLONT

Atlanta Hartsfield-Jackson

Sat 12/20

4:15 pm-11:55 pm

2 stops10h 40m

Ontario

Thu 12/25

9:55 am-10:15 pm

2 stops9h 20m

$393

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/23

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 October.

Provider	Price Accuracy	Trust Score*
Expedia	Price Accuracy2 stars	Trust Score*3 stars
FlightHub	Price Accuracy3 stars	Trust Score*3 stars
eDreams	Price Accuracy3 stars	Trust Score*3 stars
JustAirTicket	Price Accuracy-	Trust Score*3 stars
Cheapflightsfares	Price Accuracy2 stars	Trust Score*1 star
Cheapfaremart	Price Accuracy-	Trust Score*1 star
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 FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Atlanta-Ontario flight deals on Cheapflights vs. FlightHub >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 FlightHub the most. FlightHub 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

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.

How much does it cost to fly round-trip from Atlanta to Ontario?

Reviews of airlines servicing Ontario

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

4,236 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

8.0

Very good

4,236 reviews

Southwest

8.0

Very good

4,236 reviews

Reviews

1 / 20

8.0

Excellent

Walter,Aug 2025

OAK - SAN

Delta

7.9

Good

7,982 reviews

Southwest

8.0

Very good

4,236 reviews

Reviews

1 / 20

8.0

Excellent

Walter,Aug 2025

OAK - SAN

American Airlines

7.2

Good

11,032 reviews

Southwest

8.0

Very good

4,236 reviews

Reviews

1 / 20

8.0

Excellent

Walter,Aug 2025

OAK - SAN

Spirit Airlines

6.3

Okay

8,102 reviews

Southwest

8.0

Very good

4,236 reviews

Reviews

1 / 20

8.0

Excellent

Walter,Aug 2025

OAK - SAN

Frontier

5.8

Fair

3,128 reviews

Southwest

8.0

Very good

4,236 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 29m 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 6 different airlines.
How long is the flight from Atlanta to Ontario?
There are many flights that can get you from Atlanta to Ontario in 6h 50m. Fly via Frontier to get the fastest option. Atlanta and Ontario are separated by a distance of 1894 mi.
What are the cheapest airlines flying from Atlanta to Ontario round-trip?
According to our current data, Spirit Airlines ($130), Frontier ($137), and American Airlines ($280) offers the cheapest pricing from Atlanta to Ontario. These flights start at 64% 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 (85%), Air France (84%) and Delta (82%).
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 $146 on average, our data indicates $534 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 6 airlines flying from Atlanta to Ontario

Airline	Cheapest	Average	Flexibility	On-time
Spirit Airlines	Cheapest$130	Average$268	FlexibilityNo cancel fee	On-time65%
Frontier	Cheapest$137	Average$229	FlexibilityNo cancel fee	On-time62%
American Airlines	Cheapest$280	Average$431	FlexibilityNo cancel fee	On-time71%
Delta	Cheapest$299	Average$510	FlexibilityNo cancel fee	On-timeN/A
Southwest	Cheapest$330	Average$418	FlexibilityNo cancel fee	On-time63%
United Airlines	Cheapest$338	Average$428	FlexibilityNo cancel fee	On-time69%

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$56+ 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.

Find cheap flights from Atlanta to Ontario with Cheapflights

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

Cheap flight deals from Atlanta to Ontario

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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 October 23, 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 October 23, 2025.

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Use the filters below to find and compare flights from Atlanta to Ontario that are best for you.

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 October.

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?

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

What is the cheapest time of day to fly from ATL to ONT?

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

How much does it cost to fly round-trip from Atlanta to Ontario?

Weekly flight availability from Atlanta to Ontario

How often are flights from Atlanta to Ontario delayed?

What is the most punctual flight time for Atlanta to Ontario flights?

What day of the week experiences the fewest flight delays on this route?

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 fastest layover option 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 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.

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?

How long is the flight from Atlanta to Ontario?

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

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 6 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 October 23, 2025.