Question 1

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

Accepted Answer

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

Question 2

How often are flights from Atlanta to Ontario delayed?

Accepted Answer

Historically, on average around 19% 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 122 minutes.

Question 3

What airlines fly to Ontario?

Accepted Answer

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.

Question 4

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

Accepted Answer

Dallas (DFW) was the most common stop: 50% of momondo users choosing 1-stop flights on this route connected there.

Question 5

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

Accepted Answer

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

Question 6

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

Accepted Answer

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

Question 7

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

Accepted Answer

The number of flights available between Atlanta and Ontario is 56 per week as of December 2025. The most frequent departure day is Tue, with 20% of weekly flights leaving on this day.

Question 8

How have Atlanta to Ontario flight prices changed over time?

Accepted Answer

As of December 2025, prices for Atlanta to Ontario flights are approximately 41% more expensive when compared to flights at the same time last year.

Question 9

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

Accepted Answer

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

Question 10

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

Accepted Answer

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.

Question 11

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

Accepted Answer

Dallas (DFW) has the shortest average layover time for this route: 1h 11m.

Question 12

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

Accepted Answer

According to our data, Delta have had the least number of delays on this route over the last 12 months; with about 19% of their flights experiencing any sort of delay.

Question 13

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

Accepted Answer

The cheapest day to depart on your flight to Ontario is on a Tuesday when prices can be found for as low as $399. This is often the case because there is less demand to fly during this day of the week. When flying out on a Monday, the most expensive travel day of the week, you can expect to see flight prices from Atlanta to Ontario for around $649.

Question 14

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

Accepted Answer

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

Question 15

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

Accepted Answer

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 $364 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 $311 on momondo.

Question 16

What is the cheapest month to fly to Ontario?

Accepted Answer

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.

Question 17

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

Accepted Answer

8 flights are operational daily from Atlanta to Ontario as of December 2025. The most popular departure time for this route is 9:00PM, with 50% of flights per day taking off in the evening.

Question 18

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

Accepted Answer

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

Question 19

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

Accepted Answer

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.

Question 20

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

Accepted Answer

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

Question 21

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

Accepted Answer

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

Question 22

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

Accepted Answer

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.

Question 23

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

Accepted Answer

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.

Best Price Found	$348
Fastest flight time	4h 40m
Direct flights	Every day
Airports in Ontario	1 airport

Airline	Rating	Free Cancellation	Price
Spirit Airlines	PriceFrom $130	Free Cancellation	Rating 6.3 8,156 reviews	Search Spirit Airlines flights
Frontier	PriceFrom $136	Free Cancellation	Rating 5.8 3,093 reviews	Search Frontier flights
American Airlines	PriceFrom $280	Free Cancellation	Rating 7.2 11,045 reviews	Search American Airlines flights
Delta	PriceFrom $299	Free Cancellation	Rating 7.9 8,009 reviews	Search Delta flights
Southwest	PriceFrom $330	Free Cancellation	Rating 8.0 4,253 reviews	Search Southwest flights
United Airlines	PriceFrom $338	Free Cancellation	Rating 7.4 9,064 reviews	Search United Airlines flights

Cheap flights from Atlanta to Los Angeles from $52

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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 December 2025, prices for Atlanta to Ontario flights are approximately 41% more expensive when compared to flights at the same time last year.

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

Southwest 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 19% 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 122 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?

Wednesday is statistically the day of the week which experiences the fewest number of delays on this flight route. Monday 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, Delta have had the least number of delays on this route over the last 12 months; with about 19% 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: 50% 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 11m.

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

8 flights are operational daily from Atlanta to Ontario as of December 2025. The most popular departure time for this route is 9:00PM, with 50% of flights per day taking off in the evening.

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

The number of flights available between Atlanta and Ontario is 56 per week as of December 2025. The most frequent departure day is Tue, with 20% 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

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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?

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What is the most popular airline from Atlanta to Ontario?

Best airlines flying from Atlanta to Ontario

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