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

Denver (DEN) is the most affordable 1-stop option, with an average round-trip price of $125.

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’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 94% of 1-stop itineraries from Atlanta to Ontario on Cheapflights.

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.

How long is the flight from Atlanta to Ontario?

There are many flights that can get you from Atlanta to Ontario in 4h 29m. Fly via Delta to get the fastest option. Atlanta and Ontario are separated by a distance of 1894 mi. All flights are typically nonstop.

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

According to our current data, Frontier ($128), Spirit Airlines ($130), and American Airlines ($289) offers the cheapest pricing from Atlanta to Ontario. These flights start at 65% lower than the current average price 3 months from now.

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

The cheapest airline one-way is Southwest, with whom users have recently found tickets for as low as $159. However, be on the lookout for offers from Hawaiian Airlines and Alaska Airlines, as they are both options that can get you from Atlanta to Ontario for a low price.

Weekly flight availability from Atlanta to Ontario

The most flights from ATL to ONT are scheduled on a Monday (11 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (5 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 $152 on average, our data indicates $509 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 (79%), Delta (73%) and Air France (64%).

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

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

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 22m on average. When it comes time to book airfare, you have a few options: there are 9 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.

$84+ 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 $250 and $543 in November. The cheapest round-trip price found within the last 3 days was $150 on Frontier (Nov 6-Nov 9).

Home Search by date Vacation packages Hotels Flight deals Car rental Travel tips & news

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 February, booked 83 days in advance, depart on a Thursday or Saturday and return on a Tuesday

Cheap flight deals from Atlanta to Ontario

Round-trip from	$150 (CheapOair)
One-way from	$84 (Cheapflightsfares)
Popular in	December
Cheapest in	June
Average price	$332
Good round-trip deal	$299 or less
Good one-way deal	$438 or less

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 ($27 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 September 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

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 septembre 17, 2025.

jeu. 11/68:00 pmATL - ONT

1 stop6h 50mFrontier

dim. 11/96:53 amONT - ATL

1 stop8h 57mFrontier

Deal found 9/15

$150

sam. 10/186:29 pmATL - ONT

1 stop8h 21mFrontier

sam. 10/257:04 amONT - ATL

1 stop7h 19mFrontier

Deal found 9/15

$151

mar. 10/77:30 amATL - ONT

1 stop19h 20mFrontier

dim. 10/1212:49 pmONT - ATL

1 stop17h 35mFrontier

Deal found 9/15

$152

sam. 10/1110:05 pmATL - ONT

1 stop12h 44mFrontier

dim. 10/1212:49 pmONT - ATL

1 stop17h 35mFrontier

Deal found 9/15

$153

mer. 10/17:42 amATL - ONT

1 stop26h 41mFrontier

ven. 10/38:59 pmONT - ATL

1 stop16h 47mFrontier

Deal found 9/15

$159

jeu. 10/237:55 pmATL - ONT

1 stop6h 55mFrontier

jeu. 10/306:53 amONT - ATL

1 stop8h 57mFrontier

Deal found 9/15

$160

ven. 9/267:23 pmATL - ONT

1 stop27h 31mFrontier

ven. 10/1012:32 pmONT - ATL

1 stop17h 52mFrontier

Deal found 9/16

$161

jeu. 10/168:54 pmATL - ONT

1 stop13h 55mFrontier

mer. 10/226:53 amONT - ATL

1 stop8h 55mFrontier

Deal found 9/15

$162

ven. 10/36:55 pmATL - ONT

1 stop7h 43mFrontier

ven. 10/2410:50 pmONT - ATL

1 stop28h 25mFrontier

Deal found 9/16

$167

ven. 10/176:55 pmATL - ONT

1 stop8h 17mFrontier

sam. 10/257:04 amONT - ATL

1 stop7h 19mFrontier

Deal found 9/15

$168

lun. 10/63:14 pmATL - ONT

1 stop8h 42mFrontier

mer. 10/156:53 amONT - ATL

1 stop8h 55mFrontier

Deal found 9/16

$169

mer. 10/1510:29 amATL - ONT

1 stop26h 06mFrontier

sam. 10/188:34 amONT - ATL

1 stop21h 52mFrontier

Deal found 9/16

$172

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 septembre 17, 2025.

mer. 10/228:53 pmATL - ONT

Nonstop4h 29mDelta

jeu. 10/3011:36 amONT - ATL

Nonstop4h 13mDelta

Deal found 9/15

$319

sam. 10/188:55 amATL - ONT

Nonstop4h 31mDelta

sam. 10/257:05 amONT - ATL

Nonstop4h 10mDelta

Deal found 9/16

$319

jeu. 12/119:20 pmATL - ONT

Nonstop4h 43mDelta

lun. 12/1510:25 pmONT - ATL

Nonstop4h 09mDelta

Deal found 9/15

$319

mer. 12/108:55 amATL - ONT

Nonstop4h 45mDelta

lun. 12/1510:25 pmONT - ATL

Nonstop4h 09mDelta

Deal found 9/15

$319

lun. 11/38:53 pmATL - ONT

Nonstop4h 29mDelta

mar. 11/1111:45 amONT - ATL

Nonstop4h 08mDelta

Deal found 9/15

$319

ven. 10/318:55 amATL - ONT

Nonstop4h 31mDelta

dim. 11/210:00 pmONT - ATL

Nonstop4h 08mDelta

Deal found 9/15

$319

dim. 11/28:55 amATL - ONT

Nonstop4h 31mDelta

mar. 11/117:05 amONT - ATL

Nonstop4h 08mDelta

Deal found 9/15

$319

jeu. 10/235:50 pmATL - ONT

Nonstop4h 29mDelta

mar. 10/2811:36 amONT - ATL

Nonstop4h 13mDelta

Deal found 9/15

$319

mer. 10/158:53 pmATL - ONT

Nonstop4h 29mDelta

mar. 11/1111:45 amONT - ATL

Nonstop4h 08mDelta

Deal found 9/15

$319

dim. 10/268:55 amATL - ONT

Nonstop4h 31mDelta

sam. 11/17:05 amONT - ATL

Nonstop4h 10mDelta

Deal found 9/16

$319

jeu. 12/118:55 amATL - ONT

Nonstop4h 45mDelta

jeu. 12/1811:45 amONT - ATL

Nonstop4h 06mDelta

Deal found 9/16

$369

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

ven. 9/267:23 pmATL - ONT

1 stop27h 31mFrontier

ven. 10/1012:32 pmONT - ATL

1 stop17h 52mFrontier

Deal found 9/16

$161

mer. 10/17:42 amATL - ONT

1 stop26h 41mFrontier

ven. 10/38:59 pmONT - ATL

1 stop16h 47mFrontier

Deal found 9/15

$159

ven. 10/36:55 pmATL - ONT

1 stop7h 43mFrontier

ven. 10/2410:50 pmONT - ATL

1 stop28h 25mFrontier

Deal found 9/16

$167

lun. 10/63:14 pmATL - ONT

1 stop8h 42mFrontier

mer. 10/156:53 amONT - ATL

1 stop8h 55mFrontier

Deal found 9/16

$169

mar. 10/77:30 amATL - ONT

1 stop19h 20mFrontier

dim. 10/1212:49 pmONT - ATL

1 stop17h 35mFrontier

Deal found 9/15

$152

sam. 10/1110:05 pmATL - ONT

1 stop12h 44mFrontier

dim. 10/1212:49 pmONT - ATL

1 stop17h 35mFrontier

Deal found 9/15

$153

mer. 10/1510:29 amATL - ONT

1 stop26h 06mFrontier

sam. 10/188:34 amONT - ATL

1 stop21h 52mFrontier

Deal found 9/16

$172

jeu. 10/168:54 pmATL - ONT

1 stop13h 55mFrontier

mar. 10/217:04 amONT - ATL

1 stop8h 44mFrontier

Deal found 9/15

$162

ven. 10/176:55 pmATL - ONT

1 stop8h 17mFrontier

mer. 10/226:53 amONT - ATL

1 stop8h 55mFrontier

Deal found 9/15

$168

sam. 10/186:29 pmATL - ONT

1 stop8h 21mFrontier

sam. 10/257:04 amONT - ATL

1 stop7h 19mFrontier

Deal found 9/15

$151

mer. 10/227:30 amATL - ONT

1 stop29h 05mFrontier

dim. 10/266:53 amONT - ATL

1 stop8h 57mFrontier

Deal found 9/15

$150

jeu. 10/237:55 pmATL - ONT

1 stop6h 55mFrontier

jeu. 10/306:53 amONT - ATL

1 stop8h 57mFrontier

Deal found 9/15

$160

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 septembre 17, 2025.

dim. 11/27:30 amATL - ONT

1 stop6h 40mFrontier

Deal found 9/15

$84

ven. 10/36:55 pmATL - ONT

1 stop7h 43mFrontier

Deal found 9/17

$85

mer. 10/2210:29 amATL - ONT

1 stop16h 21mFrontier

Deal found 9/15

$90

mar. 9/307:42 amATL - ONT

1 stop15h 12mFrontier

Deal found 9/17

$91

lun. 11/177:30 amATL - ONT

1 stop19h 20mFrontier

Deal found 9/17

$97

ven. 9/266:55 pmATL - ONT

1 stop7h 43mFrontier

Deal found 9/16

$99

ven. 10/108:54 pmATL - ONT

1 stop13h 55mFrontier

Deal found 9/15

$106

mer. 12/38:00 amATL - ONT

1 stop29h 57mFrontier

Deal found 9/15

$115

dim. 12/710:13 amATL - ONT

1 stop13h 51mFrontier

Deal found 9/15

$116

mar. 12/1610:13 amATL - ONT

1 stop13h 51mFrontier

Deal found 9/15

$117

Fly from

Fly to

Route

Depart

Return

Price

AtlantaOntario

ATL - ONT

ATLONT

Atlanta Hartsfield-Jackson

mer. 10/22

8:53 pm-10:22 pm

Nonstop4h 29m

Ontario

jeu. 10/30

11:36 am-6:49 pm

Nonstop4h 13m

$319

AtlantaOntario

ATL - ONT

ATLONT

Atlanta Hartsfield-Jackson

sam. 10/18

8:55 am-10:26 am

Nonstop4h 31m

Ontario

sam. 10/25

7:05 am-2:15 pm

Nonstop4h 10m

$319

AtlantaOntario

ATL - ONT

ATLONT

Atlanta Hartsfield-Jackson

jeu. 12/11

9:20 pm-11:03 pm

Nonstop4h 43m

Ontario

lun. 12/15

10:25 pm-5:34 am

Nonstop4h 09m

$319

AtlantaOntario

ATL - ONT

ATLONT

Atlanta Hartsfield-Jackson

mer. 12/10

8:55 am-10:40 am

Nonstop4h 45m

Ontario

lun. 12/15

10:25 pm-5:34 am

Nonstop4h 09m

$319

AtlantaOntario

ATL - ONT

ATLONT

Atlanta Hartsfield-Jackson

lun. 11/3

8:53 pm-10:22 pm

Nonstop4h 29m

Ontario

mar. 11/11

11:45 am-6:53 pm

Nonstop4h 08m

$319

AtlantaOntario

ATL - ONT

ATLONT

Atlanta Hartsfield-Jackson

ven. 10/31

8:55 am-10:26 am

Nonstop4h 31m

Ontario

dim. 11/2

10:00 pm-5:08 am

Nonstop4h 08m

$319

AtlantaOntario

ATL - ONT

ATLONT

Atlanta Hartsfield-Jackson

dim. 11/2

8:55 am-10:26 am

Nonstop4h 31m

Ontario

mar. 11/11

7:05 am-2:13 pm

Nonstop4h 08m

$319

AtlantaOntario

ATL - ONT

ATLONT

Atlanta Hartsfield-Jackson

jeu. 10/23

5:50 pm-7:19 pm

Nonstop4h 29m

Ontario

mar. 10/28

11:36 am-6:49 pm

Nonstop4h 13m

$319

AtlantaOntario

ATL - ONT

ATLONT

Atlanta Hartsfield-Jackson

mer. 10/15

8:53 pm-10:22 pm

Nonstop4h 29m

Ontario

mar. 11/11

11:45 am-6:53 pm

Nonstop4h 08m

$319

AtlantaOntario

ATL - ONT

ATLONT

Atlanta Hartsfield-Jackson

dim. 10/26

8:55 am-10:26 am

Nonstop4h 31m

Ontario

sam. 11/1

7:05 am-2:15 pm

Nonstop4h 10m

$319

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/16

Showing 1-10 of 22 results

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

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 83 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 $327). 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 25% 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 Wednesday 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

4,242 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

4,242 reviews

Southwest

8.0

Very good

4,242 reviews

Reviews

1 / 20

8.0

Excellent

Walter,Aug 2025

OAK - SAN

Delta

8.0

Very good

7,961 reviews

Southwest

8.0

Very good

4,242 reviews

Reviews

1 / 20

8.0

Excellent

Walter,Aug 2025

OAK - SAN

American Airlines

7.2

Good

10,000 reviews

Southwest

8.0

Very good

4,242 reviews

Reviews

1 / 20

8.0

Excellent

Walter,Aug 2025

OAK - SAN

Spirit Airlines

6.3

Okay

8,023 reviews

Southwest

8.0

Very good

4,242 reviews

Reviews

1 / 20

8.0

Excellent

Walter,Aug 2025

OAK - SAN

Frontier

5.8

Fair

3,173 reviews

Southwest

8.0

Very good

4,242 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 22m on average. When it comes time to book airfare, you have a few options: there are 9 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.
How long is the flight from Atlanta to Ontario?
There are many flights that can get you from Atlanta to Ontario in 4h 29m. Fly via Delta to get the fastest option. Atlanta and Ontario are separated by a distance of 1894 mi. All flights are typically nonstop.
What are the cheapest airlines flying from Atlanta to Ontario round-trip?
According to our current data, Frontier ($128), Spirit Airlines ($130), and American Airlines ($289) offers the cheapest pricing from Atlanta to Ontario. These flights start at 65% lower than the current average price 3 months from now.
What are the cheapest airlines to fly from Atlanta to Ontario one-way?
The cheapest airline one-way is Southwest, with whom users have recently found tickets for as low as $159. However, be on the lookout for offers from Hawaiian Airlines and Alaska 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 (79%), Delta (73%) and Air France (64%).
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 $152 on average, our data indicates $509 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 $327). 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

Browse thousands of different options on Cheapflights for your next trip

Alternative routes for Atlanta to Ontario

Atlanta to Las Vegas flights

Atlanta to San Francisco flights

Atlanta to Los Angeles flights

Atlanta to Burbank flights

Atlanta to Santa Ana flights

Jacksonville to Las Vegas flights

Atlanta to San Diego flights

Atlanta to San Jose flights

Atlanta to Sacramento flights

Savannah to Las Vegas flights

Atlanta to Palm Springs flights

Chattanooga to Las Vegas flights

Atlanta to Reno flights

Jacksonville to San Francisco flights

Atlanta to Oakland flights

Jacksonville to Ontario flights

Jacksonville to Los Angeles flights

Asheville to San Diego flights

Jacksonville to San Diego flights

Savannah to Los Angeles flights

Tallahassee to Las Vegas flights

Savannah to San Francisco flights

Atlanta to Fresno flights

Augusta to Las Vegas flights

Chattanooga to Los Angeles flights

Chattanooga to San Diego flights

Jacksonville to Santa Ana flights

Savannah to San Diego flights

Asheville to San Francisco flights

Jacksonville to Reno flights

Asheville to Los Angeles flights

Asheville to Las Vegas flights

Chattanooga to Ontario flights

Jacksonville to Sacramento flights

Chattanooga to San Francisco flights

Asheville to Sacramento flights

Augusta to Los Angeles flights

Savannah to Ontario flights

Jacksonville to San Jose flights

Atlanta to Long Beach flights

Asheville to Reno flights

Atlanta to Santa Barbara flights

Savannah to Santa Ana flights

Asheville to Ontario flights

Valdosta to Las Vegas flights

Chattanooga to San Jose flights

Atlanta to Medford flights

Tallahassee to San Francisco flights

Asheville to Medford flights

Complete your trip

Ontario car rentals

Los Angeles Airport car rentals

Ontario Airport car rentals

Burbank Bob Hope Airport car rentals

Long Beach Municipal Airport car rentals

Los Angeles car rentals

San Francisco car rentals

San Diego car rentals

San Jose car rentals

Fresno car rentals

Sacramento car rentals

Burbank car rentals

Other flights to Ontario

Top 5 airlines flying from Atlanta to Ontario

Airline	Cheapest	Average	Flexibility	On-time
Frontier	Cheapest$128	Average$241	FlexibilityNo cancel fee	On-time62%
Spirit Airlines	Cheapest$130	Average$268	FlexibilityNo cancel fee	On-time65%
American Airlines	Cheapest$289	Average$429	FlexibilityNo cancel fee	On-time71%
Delta	Cheapest$299	Average$506	FlexibilityNo cancel fee	On-timeN/A
Southwest	Cheapest$325	Average$417	FlexibilityNo cancel fee	On-time63%

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.

$84+ 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 11/2. 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

2. Select your favorite providers

3. Compare prices and book

Cheapflights Tip: The best prices from Atlanta Hartsfield-Jackson to Ontario are usually found in June or February, booked 83 days in advance, depart on a Thursday or Saturday and return on a Tuesday

Cheap flight deals from Atlanta to Ontario

Round-trip from

One-way from

Popular in

Cheapest in

Average price

Good round-trip deal

Good one-way deal

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 septembre 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 septembre 17, 2025.

Cheapflights Fare Finder

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

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

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 popular is this Atlanta to Ontario flight route?

How long is the flight from Atlanta to Ontario?

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?

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Atlanta to Ontario

See prices for flight routes from nearby airports that may be better suited for you.

Top 5 airlines flying from Atlanta to Ontario

100% Free

Book with Flexibility

Travel Smart

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 septembre 17, 2025.