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Cheap flights from Atlanta to Los Angeles from $55

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 3/10. 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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0 bags

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Cheap round-trip flights

Enter your travel dates to find the best prices.
Frontier Logo
10:30 am - 11:55 pm
ATL
-
ONT
16h 25m
1 stop
Frontier Logo
12:59 am - 6:22 pm
ONT
-
ATL
14h 23m
1 stop
$123Frontier
Sat, May 2 - Tue, May 5
Frontier Logo
10:30 am - 11:59 pm
ATL
-
ONT
16h 29m
1 stop
Frontier Logo
3:30 pm - 8:09 pm
ONT
-
ATL
25h 39m
1 stop
$124Frontier
Wed, Mar 11 - Mon, Mar 23
Frontier Logo
9:09 pm - 1:11 pm
ATL
-
ONT
19h 02m
1 stop
Frontier Logo
2:06 pm - 2:28 pm
ONT
-
ATL
21h 22m
1 stop
$147Frontier
Wed, Feb 25 - Tue, Mar 3
Multiple Airlines Logo
5:47 pm - 1:11 pm
ATL
-
ONT
22h 24m
2 stops
Multiple Airlines Logo
6:15 am - 4:51 am
ONT
-
ATL
19h 36m
1 stop
$151Multiple Airlines
Tue, Mar 3 - Sat, Mar 7
Frontier Logo
5:37 pm - 10:42 pm
ATL
-
ONT
8h 05m
1 stop
Frontier Logo
12:59 am - 5:11 am
ONT
-
ATL
25h 12m
1 stop
$153Frontier
Sat, Apr 18 - Tue, Apr 21
Frontier Logo
9:15 pm - 4:38 pm
ATL
-
ONT
22h 23m
1 stop
Frontier Logo
12:59 am - 6:22 pm
ONT
-
ATL
14h 23m
1 stop
$154Frontier
Sun, May 3 - Tue, May 5
Frontier Logo
6:00 am - 11:59 pm
ATL
-
ONT
20h 59m
1 stop
Frontier Logo
2:06 pm - 7:02 am
ONT
-
ATL
13h 56m
1 stop
$157Frontier
Thu, Feb 26 - Tue, Mar 3
Frontier Logo
9:20 pm - 8:04 am
ATL
-
ONT
37h 44m
2 stops
Frontier Logo
12:59 am - 6:22 pm
ONT
-
ATL
14h 23m
1 stop
$158Frontier
Sat, May 2 - Tue, May 5
Frontier Logo
10:17 am - 9:34 pm
ATL
-
ONT
14h 17m
1 stop
Frontier Logo
6:15 am - 4:51 am
ONT
-
ATL
19h 36m
1 stop
$159Frontier
Tue, Mar 3 - Sat, Mar 7
Frontier Logo
7:45 am - 2:30 pm
ATL
-
ONT
9h 45m
1 stop
Frontier Logo
6:15 am - 4:51 am
ONT
-
ATL
19h 36m
1 stop
$164Frontier
Mon, Mar 2 - Sat, Mar 7

Frontier flights from Atlanta to Ontario

Our best Frontier deals on Atlanta to Ontario flight tickets
Frontier
May 2
ATL10:30 amAtlanta Hartsfield-Jackson
16h 25m
1 stop
ONT11:55 pmOntario
May 5
ONT12:59 amOntario
14h 23m
1 stop
ATL6:22 pmAtlanta Hartsfield-Jackson
$123
Frontier
Mar 11
ATL10:30 amAtlanta Hartsfield-Jackson
16h 29m
1 stop
ONT11:59 pmOntario
Mar 23
ONT3:30 pmOntario
25h 39m
1 stop
ATL8:09 pmAtlanta Hartsfield-Jackson
$124
Frontier
Feb 25
ATL6:00 amAtlanta Hartsfield-Jackson
18h 34m
1 stop
ONT9:34 pmOntario
Mar 4
ONT7:17 pmOntario
8h 46m
1 stop
ATL7:03 amAtlanta Hartsfield-Jackson
$147

momondo Fare Finder

 
Customize your flight search to find flights from Atlanta to Ontario that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, momondo users made 832,500 searches. Data last updated February 8, 2026.
Use the filters below to find and compare flights from Atlanta to Ontario that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

AtlantaOntario

ATL - ONT

ATLONT

Atlanta Hartsfield-Jackson

Sat 5/2

10:30 am-11:55 pm

1 stop16h 25m

Ontario

Tue 5/5

12:59 am-6:22 pm

1 stop14h 23m

$123

AtlantaOntario

ATL - ONT

ATLONT

Atlanta Hartsfield-Jackson

Wed 3/11

10:30 am-11:59 pm

1 stop16h 29m

Ontario

Mon 3/23

3:30 pm-8:09 pm

1 stop25h 39m

$124

AtlantaOntario

ATL - ONT

ATLONT

Atlanta Hartsfield-Jackson

Wed 2/25

9:09 pm-1:11 pm

1 stop19h 02m

Ontario

Tue 3/3

2:06 pm-2:28 pm

1 stop21h 22m

$147

AtlantaOntario

ATL - ONT

ATLONT

Atlanta Hartsfield-Jackson

Tue 3/3

5:47 pm-1:11 pm

2 stops22h 24m

Ontario

Sat 3/7

6:15 am-4:51 am

1 stop19h 36m

$151

AtlantaOntario

ATL - ONT

ATLONT

Atlanta Hartsfield-Jackson

Sat 4/18

5:37 pm-10:42 pm

1 stop8h 05m

Ontario

Tue 4/21

12:59 am-5:11 am

1 stop25h 12m

$153

AtlantaOntario

ATL - ONT

ATLONT

Atlanta Hartsfield-Jackson

Sun 5/3

9:15 pm-4:38 pm

1 stop22h 23m

Ontario

Tue 5/5

12:59 am-6:22 pm

1 stop14h 23m

$154

AtlantaOntario

ATL - ONT

ATLONT

Atlanta Hartsfield-Jackson

Thu 2/26

6:00 am-11:59 pm

1 stop20h 59m

Ontario

Tue 3/3

2:06 pm-7:02 am

1 stop13h 56m

$157

AtlantaOntario

ATL - ONT

ATLONT

Atlanta Hartsfield-Jackson

Sat 5/2

9:20 pm-8:04 am

2 stops37h 44m

Ontario

Tue 5/5

12:59 am-6:22 pm

1 stop14h 23m

$158

AtlantaOntario

ATL - ONT

ATLONT

Atlanta Hartsfield-Jackson

Tue 3/3

10:17 am-9:34 pm

1 stop14h 17m

Ontario

Sat 3/7

6:15 am-4:51 am

1 stop19h 36m

$159

AtlantaOntario

ATL - ONT

ATLONT

Atlanta Hartsfield-Jackson

Mon 3/2

7:45 am-2:30 pm

1 stop9h 45m

Ontario

Sat 3/7

6:15 am-4:51 am

1 stop19h 36m

$164

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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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?

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 $225. 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 $268.

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 $399. 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 $639.

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

In the evening is the cheapest time of day to fly from Atlanta to Ontario when you can find flight prices for as low as $491. Flying to Ontario in the evening 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 $532 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 $381 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 $302 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 February 2026, prices for Atlanta to Ontario flights are approximately 2% more expensive 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

$348

Fastest flight time

4h 35m

Direct flights

Every day

Airports in Ontario

1 airport
The best one-way flight to Ontario from Atlanta in the past 72 hours is $348. The best round-trip flight deal from Atlanta to Ontario found on momondo in the last 72 hours is $469.
The fastest flight from Atlanta to Ontario takes 4h 35m
Direct flights go from Atlanta to Ontario every day.
There is 1 airport in Ontario. From Atlanta there are direct flights to 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 4h 35m, 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?

  • 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?

  • 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
Airline
Rating
Free Cancellation
Price
FrontierPriceFrom $141Free CancellationRating
5.7
3,052 reviews
Search Frontier flights
American AirlinesPriceFrom $280Free CancellationRating
7.2
11,249 reviews
Search American Airlines flights
DeltaPriceFrom $299Free CancellationRating
7.9
8,172 reviews
Search Delta flights
SouthwestPriceFrom $325Free CancellationRating
8.0
4,280 reviews
Search Southwest flights
United AirlinesPriceFrom $338Free CancellationRating
7.4
9,254 reviews
Search United Airlines flights

  • Southwest Flights From Atlanta to Ontario

    Southwest flies from Atlanta to Ontario around 4 times per week, with 4,282 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 $429 for Southwest flights on this route.

  • Delta Flights From Atlanta to Ontario

    Across 8,173 Delta reviews on momondo, the average score is 7.9/10. Delta flies from Atlanta to Ontario about 12 times each week, with ticket deals ranging from $299 to $502. 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

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.
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