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

According to our data, WestJet have had the least number of delays on this route over the last 12 months; with about 9% of their flights experiencing any sort of delay.

Which airport is the most popular layover for flights between Atlanta and Ontario?

Dallas (DFW) was the most common stop: 56% of momondo users choosing 1-stop flights on this route connected there.

What is the cheapest airline that flies from Atlanta Hartsfield-Jackson to Ontario?

Frontier is the most popular carrier operating from Atlanta Hartsfield-Jackson to Ontario

Which layover airport has the shortest travel time from Atlanta to Ontario?

Flights connecting via Phoenix (PHX) have the shortest average one-way travel time: 6h 55m.

Which layover airport has the shortest connection time from Atlanta to Ontario?

Dallas (DFW) has the shortest average layover time for this route: 1h 12m.

How many flights depart from Atlanta to Ontario on average per week?

The number of flights available between Atlanta and Ontario is 69 per week as of November 2025. The most frequent departure day is Mon, with 19% of weekly flights leaving on this day.

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

Generally, flights departing in the morning tend to experience fewer delays. Flights at night have, in the past, seen delays more frequently in comparison.

How often are flights from Atlanta to Ontario delayed?

Historically, on average around 21% of flights between Atlanta and Ontario have experienced a delay on any given week. The average delay length over the past 12 months has been 136 minutes.

How many flights depart from Atlanta to Ontario on average per day?

9 flights are operational daily from Atlanta to Ontario as of November 2025. The most popular departure time for this route is 5:00PM, with 52% of flights per day taking off in the afternoon.

What airlines fly to Ontario?

Delta, Frontier and Spirit Airlines are the top three most popular airlines that fly to Ontario from Atlanta according to our data. Delta is the first choice among our users, with 31% of people opting to fly with this airline when traveling to Ontario. Keep in mind that there are 8 different airlines that fly to Ontario on a routine basis, so you have a few additional options to choose from.

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

Saturday is statistically the day of the week which experiences the fewest number of delays on this flight route. Tuesday has historically seen more delays on average compared to the rest of the week.

Which layover airport offers the lowest fares from Atlanta to Ontario?

Flights via Denver (DEN) offer the lowest average round-trip price of $284.

When did momondo last update prices for flights from Atlanta Hartsfield-Jackson Airport to Ontario Airport?

Prices for flights from Atlanta Hartsfield-Jackson Airport to Ontario Airport are updated daily.

How many operators does momondo search for flights from Atlanta Hartsfield-Jackson Airport to Ontario Airport?

As of November 2025, there are 6 operators available to choose from for flights from Atlanta Hartsfield-Jackson Airport to Ontario Airport.

How old do you have to be to fly from Atlanta Hartsfield-Jackson Airport to Ontario Airport?

Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Atlanta Hartsfield-Jackson Airport to Ontario Airport.

What documentation or ID do you need to fly to Ontario Airport?

The necessary travel and health documents for your Ontario Airport trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's license and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.

$57 Cheap Flights from Atlanta to Ontario in 2025/26

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8:32 pm - 2:26 pmATL-ONT

20h 54m1 stop

12:58 am - 7:02 pmONT-ATL

15h 04m1 stop

$165Frontier

Find Deal

lun., nov. 24 - mié., nov. 26

8:00 pm - 10:50 pmATL-ONT

29h 50m1 stop

6:10 pm - 6:13 amONT-ATL

9h 03m1 stop

$166Frontier

Find Deal

vie., ene. 16 - lun., ene. 19

9:10 pm - 2:25 pmATL-ONT

20h 15m2 stops

12:30 pm - 9:25 amONT-ATL

17h 55m1 stop

$167Frontier

Find Deal

vie., dic. 12 - mar., dic. 16

9:10 pm - 2:25 pmATL-ONT

20h 15m2 stops

12:30 pm - 9:25 amONT-ATL

17h 55m1 stop

$168Frontier

Find Deal

vie., dic. 12 - mar., dic. 16

9:57 pm - 4:33 pmATL-ONT

21h 36m2 stops

2:59 pm - 12:44 pmONT-ATL

18h 45m1 stop

$169Multiple Airlines

Find Deal

sáb., dic. 6 - lun., dic. 15

10:40 pm - 4:33 pmATL-ONT

20h 53m2 stops

6:19 pm - 12:10 pmONT-ATL

14h 51m1 stop

$171Multiple Airlines

Find Deal

dom., dic. 7 - vie., dic. 12

8:00 pm - 2:25 pmATL-ONT

21h 25m1 stop

6:15 am - 5:28 amONT-ATL

20h 13m2 stops

$174Frontier

Find Deal

dom., dic. 7 - mié., dic. 17

11:37 am - 5:26 pmATL-ONT

8h 49m1 stop

3:20 pm - 7:31 amONT-ATL

13h 11m2 stops

$175Frontier

Find Deal

lun., nov. 24 - lun., dic. 15

12:43 pm - 9:17 pmATL-ONT

11h 34m1 stop

6:15 am - 8:00 pmONT-ATL

10h 45m1 stop

$176Frontier

Find Deal

mié., dic. 3 - jue., dic. 4

6:00 am - 5:15 pmATL-ONT

14h 15m2 stops

6:00 pm - 5:30 amONT-ATL

8h 30m1 stop

$177Frontier

Find Deal

lun., dic. 22 - mié., dic. 31

Frontier flights from Atlanta to Ontario

Our best Frontier deals on Atlanta to Ontario flight tickets

Frontier

Nov 24

ATL8:32 pmAtlanta Hartsfield-Jackson

20h 54m

1 stop

ONT2:26 pmOntario

Nov 26

ONT12:58 amOntario

15h 04m

1 stop

ATL7:02 pmAtlanta Hartsfield-Jackson

$165

Find similar

Frontier

Jan 16

ATL8:00 pmAtlanta Hartsfield-Jackson

29h 50m

1 stop

ONT10:50 pmOntario

Jan 19

ONT6:10 pmOntario

9h 03m

1 stop

ATL6:13 amAtlanta Hartsfield-Jackson

$166

Find similar

Frontier

Dec 12

ATL9:10 pmAtlanta Hartsfield-Jackson

20h 15m

2 stops

ONT2:25 pmOntario

Dec 16

ONT12:30 pmOntario

17h 55m

1 stop

ATL9:25 amAtlanta Hartsfield-Jackson

$167

Find similar

Fly from

Fly to

Route

Depart

Return

Price

AtlantaOntario

ATL - ONT

ATLONT

Atlanta Hartsfield-Jackson

lun. 11/24

8:32 pm-2:26 pm

1 stop20h 54m

Ontario

mié. 11/26

12:58 am-7:02 pm

1 stop15h 04m

$165

AtlantaOntario

ATL - ONT

ATLONT

Atlanta Hartsfield-Jackson

vie. 1/16

8:00 pm-10:50 pm

1 stop29h 50m

Ontario

lun. 1/19

6:10 pm-6:13 am

1 stop9h 03m

$166

AtlantaOntario

ATL - ONT

ATLONT

Atlanta Hartsfield-Jackson

vie. 12/12

9:10 pm-2:25 pm

2 stops20h 15m

Ontario

mar. 12/16

12:30 pm-9:25 am

1 stop17h 55m

$167

AtlantaOntario

ATL - ONT

ATLONT

Atlanta Hartsfield-Jackson

vie. 12/12

9:10 pm-2:25 pm

2 stops20h 15m

Ontario

mar. 12/16

12:30 pm-9:25 am

1 stop17h 55m

$168

AtlantaOntario

ATL - ONT

ATLONT

Atlanta Hartsfield-Jackson

sáb. 12/6

9:57 pm-4:33 pm

2 stops21h 36m

Ontario

lun. 12/15

2:59 pm-12:44 pm

1 stop18h 45m

$169

AtlantaOntario

ATL - ONT

ATLONT

Atlanta Hartsfield-Jackson

dom. 12/7

10:40 pm-4:33 pm

2 stops20h 53m

Ontario

vie. 12/12

6:19 pm-12:10 pm

1 stop14h 51m

$171

AtlantaOntario

ATL - ONT

ATLONT

Atlanta Hartsfield-Jackson

dom. 12/7

8:00 pm-2:25 pm

1 stop21h 25m

Ontario

mié. 12/17

6:15 am-5:28 am

2 stops20h 13m

$174

AtlantaOntario

ATL - ONT

ATLONT

Atlanta Hartsfield-Jackson

lun. 11/24

11:37 am-5:26 pm

1 stop8h 49m

Ontario

lun. 12/15

3:20 pm-7:31 am

2 stops13h 11m

$175

AtlantaOntario

ATL - ONT

ATLONT

Atlanta Hartsfield-Jackson

mié. 12/3

12:43 pm-9:17 pm

1 stop11h 34m

Ontario

jue. 12/4

6:15 am-8:00 pm

1 stop10h 45m

$176

AtlantaOntario

ATL - ONT

ATLONT

Atlanta Hartsfield-Jackson

lun. 12/22

6:00 am-5:15 pm

2 stops14h 15m

Ontario

mié. 12/31

6:00 pm-5:30 am

1 stop8h 30m

$177

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How to get the cheapest flight ticket from Atlanta to Ontario

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

Prices

Airlines

Delays

Layovers

Other information

What is the cheapest month to fly to Ontario?

In general, October is the cheapest month to fly from Atlanta to Ontario. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $246. If you aren’t able to travel during the month of October, then book flights to Ontario from Atlanta during June instead. Flights to Ontario in June, while not as cheap as those in October, still average around $261.

What is the cheapest day to depart on your flight to Ontario?

The cheapest day to depart on your flight to Ontario is on a Tuesday when prices can be found for as low as $429. This is often the case because there is less demand to fly during this day of the week. When flying out on a Sunday, the most expensive travel day of the week, you can expect to see flight prices from Atlanta to Ontario for around $689.

What is the cheapest time of day to depart on your flight to Ontario?

At noon is the cheapest time of day to fly from Atlanta to Ontario when you can find flight prices for as low as $412. Flying to Ontario at noon is an ideal time because this is during off-peak travel hours. If you have a flexible travel schedule, then try to avoid flying in the afternoon when prices are $548 on average. Flights to Ontario from Atlanta in the afternoon are generally more expensive because this time of day is more convenient for travelers’ schedules.

What is the cheapest Atlanta Hartsfield-Jackson to Ontario flight route?

Fly from Atlanta Hartsfield-Jackson to Ontario for the best Atlanta Hartsfield-Jackson - Ontario flight prices

How far in advance should I book a flight to Ontario?

You are more likely to see cheaper flights to Ontario from Atlanta when booking weeks ahead of your departure date. In general, you can expect to find flights to Ontario for around $363 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Ontario from Atlanta for as low as $303 on momondo.

What cabin class options are available on Atlanta Hartsfield-Jackson to Ontario flights?

There are 4 cabin classes available to choose from on Atlanta Hartsfield-Jackson to Ontario flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

How have Atlanta to Ontario flight prices changed over time?

As of November 2025, prices for Atlanta to Ontario flights are approximately 4% cheaper when compared to flights at the same time last year.

When to book flights from Atlanta to Ontario

Are you open to changing your travel dates? Check out the ideal times to fly from Atlanta to Ontario according to our flight data. Find out which month and days have the cheapest flights.

Estimated round-trip price

Cheap Atlanta to Ontario (ATL to ONT) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Atlanta to Ontario

Best Price Found	$448
Fastest flight time	4h 40m
Direct flights	Every day
Airports in Ontario	1 airport

The best one-way flight to Ontario from Atlanta in the past 72 hours is $448. The best round-trip flight deal from Atlanta to Ontario found on momondo in the last 72 hours is $379.

The fastest flight from Atlanta to Ontario takes 4h 40m

Direct flights go from Atlanta to Ontario every day.

There is 1 airport near Ontario: Ontario (ONT)

Search flight deals

How far is Atlanta Hartsfield-Jackson to Ontario by plane?
Atlanta Hartsfield-Jackson and Ontario are 1897.6 mi apart from one another. Flights usually cover this in 6h 49m, depending on flying conditions and air traffic around both airports.
When did momondo last update prices for flights from Atlanta Hartsfield-Jackson Airport to Ontario Airport?
Prices for flights from Atlanta Hartsfield-Jackson Airport to Ontario Airport are updated daily.
How many operators does momondo search for flights from Atlanta Hartsfield-Jackson Airport to Ontario Airport?
As of November 2025, there are 6 operators available to choose from for flights from Atlanta Hartsfield-Jackson Airport to Ontario Airport.
How old do you have to be to fly from Atlanta Hartsfield-Jackson Airport to Ontario Airport?
Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Atlanta Hartsfield-Jackson Airport to Ontario Airport.
What documentation or ID do you need to fly to Ontario Airport?
The necessary travel and health documents for your Ontario Airport trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's license and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.
What is the most popular plane model from Atlanta to Ontario?
Based on momondo bookings for this flight route, the most popular plane model on flight routes from Atlanta to Ontario is Airbus A321-100/200 (39.07% of total bookings). The next most popular plane models are Airbus A321neo (18.03%), Airbus A318/A319/A320/A321 (13.11%), and Airbus A320-100/200 (7.92%).
What is the most popular airline from Atlanta to Ontario?
Based on momondo bookings for this flight route, the most popular airline on flight routes from Atlanta to Ontario is Frontier (44% of total bookings). The next most popular airlines are Delta (36%), Southwest (11%), and American Airlines (6%).

Best airlines flying from Atlanta to Ontario

Compare and see reviews for airlines that fly from Atlanta to Ontario with momondo

Airline	Rating	Free Cancellation	Price
Spirit Airlines	PriceFrom $130	Free Cancellation	Rating 6.3 8,137 reviews	Search Spirit Airlines flights
Frontier	PriceFrom $135	Free Cancellation	Rating 5.8 3,113 reviews	Search Frontier flights
American Airlines	PriceFrom $289	Free Cancellation	Rating 7.2 11,050 reviews	Search American Airlines flights
Delta	PriceFrom $299	Free Cancellation	Rating 7.9 8,008 reviews	Search Delta flights
Southwest	PriceFrom $325	Free Cancellation	Rating 8.0 4,235 reviews	Search Southwest flights
United Airlines	PriceFrom $338	Free Cancellation	Rating 7.4 9,015 reviews	Search United Airlines flights

Southwest Flights From Atlanta to Ontario
Southwest flies from Atlanta to Ontario around 7 times per week, with 4,235 momondo users rating the airline 8.0/10. The cheapest Southwest deal from Atlanta to Ontario in the last 72 hours was $325 (round-trip), much lower than the average airfare cost of $416 for Southwest flights on this route.
Delta Flights From Atlanta to Ontario
Across 8,008 Delta reviews on momondo, the average score is 7.9/10. Delta flies from Atlanta to Ontario about 16 times each week, with ticket deals ranging from $299 to $509. Price data is based on momondo searches in the last 72 hours.

Why use momondo?

Why should I use momondo to find a flight deal from Atlanta to Ontario?

momondo collates all your flight options in one place and lets you filter them to find the perfect flight from Atlanta to Ontario. momondo saves you time and could save you money on your trip.

Can I find flights from Atlanta to Ontario with flexible booking policies on momondo?

All flight searches from Atlanta to Ontario on momondo can be filtered to show those which offer flexible booking policies.

How can momondo help me find flights from Atlanta to Ontario?

Once all potential Atlanta to Ontario flight options are in front of you, momondo lets you sort and filter flights based on preferences such as airline, price and flight times amongst many other options.

I’m not ready to book a flight from Atlanta to Ontario right now. Can momondo alert me if prices change?

Yes momondo offers price alerts on flights to Ontario from Atlanta. After performing a search on this page you should be able to see the price alert set up feature. Simply provide a valid email address and momondo will instantly alert you when prices change.

An easier way to manage your Ontario trip

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Cheap flights from Atlanta to Los Angeles from $57

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Atlanta to Los Angeles departing on 1/13. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.

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How to get the cheapest flight ticket from Atlanta to Ontario

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the cheapest month to fly to Ontario?

What is the cheapest day to depart on your flight to Ontario?

What is the cheapest time of day to depart on your flight to Ontario?

What is the cheapest Atlanta Hartsfield-Jackson to Ontario flight route?

Fly from Atlanta Hartsfield-Jackson to Ontario for the best Atlanta Hartsfield-Jackson - Ontario flight prices

How far in advance should I book a flight to Ontario?

What cabin class options are available on Atlanta Hartsfield-Jackson to Ontario flights?

There are 4 cabin classes available to choose from on Atlanta Hartsfield-Jackson to Ontario flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

How have Atlanta to Ontario flight prices changed over time?

As of November 2025, prices for Atlanta to Ontario flights are approximately 4% cheaper when compared to flights at the same time last year.

What is the cheapest airline that flies from Atlanta Hartsfield-Jackson to Ontario?

Frontier is the most popular carrier operating from Atlanta Hartsfield-Jackson to Ontario

What airlines fly to Ontario?

How often are flights from Atlanta to Ontario delayed?

Historically, on average around 21% of flights between Atlanta and Ontario have experienced a delay on any given week. The average delay length over the past 12 months has been 136 minutes.

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

Generally, flights departing in the morning tend to experience fewer delays. Flights at night have, in the past, seen delays more frequently in comparison.

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

Saturday is statistically the day of the week which experiences the fewest number of delays on this flight route. Tuesday has historically seen more delays on average compared to the rest of the week.

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

According to our data, WestJet have had the least number of delays on this route over the last 12 months; with about 9% of their flights experiencing any sort of delay.

Which airport is the most popular layover for flights between Atlanta and Ontario?

Dallas (DFW) was the most common stop: 56% of momondo users choosing 1-stop flights on this route connected there.

Which layover airport offers the lowest fares from Atlanta to Ontario?

Flights via Denver (DEN) offer the lowest average round-trip price of $284.

Which layover airport has the shortest travel time from Atlanta to Ontario?

Flights connecting via Phoenix (PHX) have the shortest average one-way travel time: 6h 55m.

Which layover airport has the shortest connection time from Atlanta to Ontario?

Dallas (DFW) has the shortest average layover time for this route: 1h 12m.

How many flights depart from Atlanta to Ontario on average per day?

9 flights are operational daily from Atlanta to Ontario as of November 2025. The most popular departure time for this route is 5:00PM, with 52% of flights per day taking off in the afternoon.

How many flights depart from Atlanta to Ontario on average per week?

The number of flights available between Atlanta and Ontario is 69 per week as of November 2025. The most frequent departure day is Mon, with 19% of weekly flights leaving on this day.

When to book flights from Atlanta to Ontario

Cheap Atlanta to Ontario (ATL to ONT) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Atlanta to Ontario

Best Price Found

Fastest flight time

Direct flights

Airports in Ontario

How far is Atlanta Hartsfield-Jackson to Ontario by plane?

When did momondo last update prices for flights from Atlanta Hartsfield-Jackson Airport to Ontario Airport?

How many operators does momondo search for flights from Atlanta Hartsfield-Jackson Airport to Ontario Airport?

How old do you have to be to fly from Atlanta Hartsfield-Jackson Airport to Ontario Airport?

What documentation or ID do you need to fly to Ontario Airport?

What is the most popular plane model from Atlanta to Ontario?

What is the most popular airline from Atlanta to Ontario?

Best airlines flying from Atlanta to Ontario

Compare and see reviews for airlines that fly from Atlanta to Ontario with momondo

Southwest Flights From Atlanta to Ontario

Delta Flights From Atlanta to Ontario

Why use momondo?

Why should I use momondo to find a flight deal from Atlanta to Ontario?

Can I find flights from Atlanta to Ontario with flexible booking policies on momondo?

How can momondo help me find flights from Atlanta to Ontario?

I’m not ready to book a flight from Atlanta to Ontario right now. Can momondo alert me if prices change?

An easier way to manage your Ontario trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.