ATL - ONT

$79 Find Cheap Flights from Atlanta to Ontario

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Atlanta to Ontario departing on 4/25. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult
1 adult, Economy, 0 bags

KAYAK searches hundreds of travel sites at once for deals on flights to Ontario

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Atlanta to Ontario, as well as popular online travel agencies
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Atlanta to Ontario, as well as popular online travel agencies
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41.299.237 searches in the past 7 days on KAYAK

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Everything you should know

Cheapest round-trip
$159
Overall average: $425
Frontier
Thu 4/16Sat 4/18
ATL - ONT • 1 stop
Cheapest non-stop
$439
Typical prices: $434-$649
Delta
Tue 4/28Mon 5/4
ATL - ONT • Non-stop
Advice from real travelers
AI-powered summary based on content written by travel experts. AI can make mistakes.
Avoid parking at ATL; use MARTA for convenience.
Use Metrolink San Bernardino Line for easy ONT access.
Expert advice
Expert advice
Expert advice
Expert advice
Nonstop flights
You can fly direct with Delta. Average duration is 4h 42m
Direct flights
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Avoid delays
Most punctual • 79% on-time
Best time • Fewest delays
Insights
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Top layover airports
Cheapest • Avg $260 (round-trip)
Shortest trip • 6h 37m (one-way)
Insights
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When to book
in advance
Our data shows that travelers who book at least 2 weeks in advance save around 11% compared to booking last minute.
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When to travel
Cheapest • 43% price drop
Most popular
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KAYAK searches 100s of sites at once to find you the best travel deals.
We hope you love your trip to Ontario!
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Flight Deals

Cheap Flights from Atlanta to Ontario (ATL-ONT)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Atlanta to Ontario that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from Atlanta to Ontario

Thu, Apr 16 - Sat, Apr 18
Frontier Logo
9:15 pm - 4:38 pm
ATL
-
ONT
22h 23m
1 stop
Frontier Logo
12:59 am - 5:11 am
ONT
-
ATL
25h 12m
1 stop
$159Frontier
Sat, Apr 18 - Tue, Apr 21
Frontier Logo
5:37 pm - 10:37 pm
ATL
-
ONT
8h 00m
1 stop
Frontier Logo
7:44 pm - 6:43 am
ONT
-
ATL
7h 59m
1 stop
$160Frontier
Sat, Apr 18 - Sat, Apr 25
Frontier Logo
8:51 pm - 7:26 am
ATL
-
ONT
13h 35m
1 stop
Frontier Logo
8:00 am - 11:55 pm
ONT
-
ATL
12h 55m
1 stop
$161Frontier
Sat, Apr 18 - Sat, Apr 25
Frontier Logo
8:51 pm - 7:26 am
ATL
-
ONT
13h 35m
1 stop
Frontier Logo
8:00 am - 11:55 pm
ONT
-
ATL
12h 55m
1 stop
$162Frontier
Sun, Apr 12 - Tue, Apr 21
Frontier Logo
7:08 pm - 8:04 am
ATL
-
ONT
15h 56m
1 stop
Frontier Logo
7:44 pm - 6:43 am
ONT
-
ATL
7h 59m
1 stop
$167Frontier
Fri, Apr 17 - Wed, Apr 29
Frontier Logo
8:51 pm - 11:55 pm
ATL
-
ONT
30h 04m
1 stop
Frontier Logo
8:05 am - 12:01 am
ONT
-
ATL
12h 56m
1 stop
$171Frontier
Mon, May 4 - Mon, May 11
Frontier Logo
6:30 am - 4:38 pm
ATL
-
ONT
13h 08m
1 stop
Frontier Logo
8:06 pm - 9:22 am
ONT
-
ATL
10h 16m
1 stop
$172Frontier
Tue, Apr 21 - Mon, Apr 27
Frontier Logo
10:35 am - 11:55 pm
ATL
-
ONT
16h 20m
1 stop
Frontier Logo
12:59 am - 5:11 am
ONT
-
ATL
25h 12m
1 stop
$173Frontier
Tue, Apr 7 - Mon, Apr 13
Frontier Logo
6:00 am - 4:23 pm
ATL
-
ONT
13h 23m
1 stop
Frontier Logo
12:59 am - 6:22 pm
ONT
-
ATL
14h 23m
1 stop
$179Frontier
Tue, Apr 7 - Tue, Apr 14
Frontier Logo
6:00 am - 4:23 pm
ATL
-
ONT
13h 23m
1 stop
Frontier Logo
7:44 pm - 6:43 am
ONT
-
ATL
7h 59m
1 stop
$180Frontier
Booking Insights

KAYAK's insights & trends for Atlanta to Ontario flights

Get data-powered insights and trends into flights from Atlanta to Ontario to help you find the cheapest flights, the best time to fly and much more.

What’s the cheapest day of the week to fly from Atlanta to Ontario?

The average price of all round-trip flights from Atlanta to Ontario clicked on KAYAK for each day over the last 12 months.

If your flying dates are flexible, you should consider flying to Ontario on a Tuesday, as we generally find the cheapest rates on that day for this route. On the other hand, Sunday is the most expensive day to fly from Atlanta to Ontario. For your return ticket, we recommend flying on a Tuesday and avoiding Sundays for the best deals.

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

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from Atlanta to Ontario, removes the top 0.1% to account for outliers, and then takes the median of all values for each month.

The cheapest month for flights from Atlanta to Ontario is October, where tickets cost $225 (return) on average. On the other hand, the most expensive months are February and December, where the average cost of round-trip tickets is $489 and $469 respectively.

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

To calculate weekly average prices, KAYAK takes all prices for each week before departure over the last year for round-trip flights from Atlanta to Ontario, removes the top 0.1% to account for outliers, and then takes the average of all the values for each week.

To get a below average price on the flight from Atlanta to Ontario, you should book around 2 weeks before departure, which saves you about 11% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 5 weeks before departure.

Expert advice

Expert advice for your flight from Atlanta to Ontario

 
AI-powered summary based on content written by travel experts. AI can make mistakes.
KAYAK teamed up with top travel experts to share the best tips for your journey.
Our travel experts
Jennifer Simonson

Jennifer Simonson

Expert on ONT

Jennifer Simonson is driven by her lifelong commitment to exploring the globe. Her insatiable curiosity had led her to immerse herself into diverse locations like Oklahoma City and Pismo. Her hotel recommendations are the result of the myriad hotels she's stayed at across her travels. Along her journey, she cherishes engaging conversations with locals, indulging in the finest ice cream, trying her hand at surfing, and embarking on nature-filled hikes.

Blane Bachelor

Blane Bachelor

Expert on ATL

Blane Bachelor is a journalist and editor specializing in travel and aviation who writes regularly for top global outlets. Born and raised in Florida, Blane has worked and lived in four countries, including the Netherlands, where she’s currently based with her family. Her favorite way to get to know a new destination is by running or riding a bike around town – or hearing a spooky ghost story about local history. She will always choose the window seat.

Good to know

Low seasonJanuary
Cheapest flight$79
Most popular time to fly and prices are also 23% lower on average.
Flight from Atlanta to Ontario

When to book flights from Atlanta to Ontario

Are your dates flexible? Find out the best times to travel from Atlanta to Ontario based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated round-trip price
KAYAK looks at all historical flight data for each date to provide a predicted price for one-way trips or round-trips with a duration up to 40 days. While we try to provide actual minimum prices for each date, some prices are predictions and actual prices may differ.

FAQs for booking flights from Atlanta to Ontario

  • Where can I sleep when at ONT?

    If you need to sleep after flights from Atlanta to Ontario, you can find a number of accommodation options close to the airport. There are three hotels that are within a 10min to 30min distance from the airport and include: the Azure Hotel and Suites Ontario Airport, the Candlewood Suites Ontario Convention Center and the Conform Suites Ontario Convention Center. The Comfort Suites Ontario Convention Center has an added advantage over the others since there is the provision of a free airport shuttle from the airport.

  • Are there any places at ONT I can eat?

    You might get hungry when at the airport or are just looking for a place where you may grab a snack when on the go. There are a variety of food concessions for you to choose from such as the Wolfgang Puck Pizza, Harvest and Grounds and the Cross Grain Brewhouse in Terminal 2 and the Wahoo’s Fish Taco, Rock and Brews, Einstein Bros and Bagels and Coffee Bean and Tea Leaf in Terminal 4. All the food concessions run on separate schedules and it is important to know none runs for 24h.

  • Where can I locate the Traveler’s Aid at ONT?

    Traveler's Aid has workers that are dispersed across the Ontario airport and are available to help with issues like finding temporary housing, mailing money, recovering lost or stolen money, providing transportation, etc. In Terminal 2 and Terminal 4, respectively, the Traveler's Aid offices are situated between the escalator and baggage claim.

  • What are my transport options to ATL?

    There are several of transport options because you might want to hunt for dependable transportation when heading to the airport. The most popular transportation choices are buses and cabs, with only MARTA bus 191 operating on the airport route. There are more taxis since they are plentiful, practical, and quick. You might also think about renting a car, with rental locations adjacent to the terminals and reachable through the ATL SkyTrain, the airport's inter-terminal transit system.

  • What is the cheapest flight from Atlanta to Ontario?

    In the last 3 days, the lowest price for a flight from Atlanta to Ontario was $79 for a one-way ticket and $159 for a round-trip.

  • Do I need a passport to fly between Atlanta and Ontario?

    A passport is not required to fly from Atlanta to Ontario.

  • Which airlines offer Wi-Fi service onboard planes from Atlanta to Ontario?

    Delta, Alaska Airlines, JetBlue, and American Airlines offer inflight Wi-Fi service on the Atlanta to Ontario flight route.

  • Which aircraft models fly most regularly from Atlanta to Ontario?

    The Airbus A321-100/200 is the aircraft model that flies most regularly on the Atlanta to Ontario flight route.

  • Which airline alliances offer flights from Atlanta to Ontario?

    Star Alliance, oneworld, and SkyTeam are the airline alliances operating flights between Atlanta and Ontario, with Star Alliance being the most commonly used for this route.

  • On which days can I fly direct from Atlanta to Ontario?

    There are nonstop flights from Atlanta to Ontario on a daily basis.

  • Which is the best airline for flights from Atlanta to Ontario, Southwest or Delta?

    The two airlines most popular with KAYAK users for flights from Atlanta to Ontario are Southwest and Delta. With an average price for the route of $444 and an overall rating of 8.0, Southwest is the most popular choice. Delta is also a great choice for the route, with an average price of $507 and an overall rating of 7.9.

  • How does KAYAK find such low prices on flights from Atlanta to Ontario?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Atlanta to Ontario.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Atlanta to Ontario?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Ontario from Atlanta is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights from Atlanta to Ontario?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to Ontario with an airline and back to Atlanta with another airline. Booking your flights between Atlanta and ONT can sometimes prove cheaper using this method.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Atlanta to Ontario?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to Ontario from Atlanta up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

KAYAK’s top tips for finding a cheap flight from Atlanta to Ontario

  • Looking for a cheap flight? 25% of our users found flights on this route for $398 or less one-way and $459 or less round-trip.
  • You can head over to the Information Desk which is located at both Terminal 2 and 4 at Ontario International Airport (ONT) where the Information Desks are located if you are unable to get assistance from the Traveler's Aid personnel.
  • Water fountains are available in the Terminal 4 and Terminal 2 sectors of ONT if you become dehydrated while there.
  • You might want to be informed that ONT offers baby care services if you're bringing a baby. Near Gate 207 in Terminal 2 and Gate 407 in Terminal 4, respectively, you can find spaces to change diapers and nurse.
  • When you are in Hartsfield-Jackson Atlanta International Airport (ATL), go to Concourse T's second floor to use the business services there. You will be able to have access to amenities such as a desk area, free Wi-Fi, a fax machine and printer to increase convenience.
  • There are reusable, potable charging systems at Gates E27, C3 and A16 of ATL which you can take advantage of to charge your electrical appliances.

Prefer to fly direct from Atlanta to Ontario?

 
Direct data is based off flight results for the next 60 days. Find direct flights from all airlines flying direct from Atlanta Hartsfield-Jackson to Ontario.
Find which airlines fly direct from Atlanta Hartsfield-Jackson Airport to Ontario Airport, which days they fly and book direct flights.

Direct departures

Atlanta Hartsfield-Jackson to Ontario

Monday

Delta

Delta

Tuesday

Delta

Delta

Wednesday

Delta

Delta

Thursday

Delta

Delta

Friday

Delta

Delta

Saturday

Delta

Delta

Sunday

Delta

Delta

See more direct flights

Direct returns

Ontario to Atlanta Hartsfield-Jackson

Monday

Delta

Delta

Tuesday

Delta

Delta

Wednesday

Delta

Delta

Thursday

Delta

Delta

Friday

Delta

Delta

Saturday

Delta

Delta

Sunday

Delta

Delta

See more direct flights

Reviews of the top 5 airlines serving from Atlanta to Ontario

 
See real verified KAYAK customer reviews for airlines flying from Atlanta to Ontario. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with from Atlanta to Ontario? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
8.0
SouthwestOverall score based on 4331 reviews
7.5Entertainment
7.0Food
8.0Comfort
8.1Boarding
8.6Crew
Airline reviews

Boarding was easy. The seats are small and fairly uncomfortable

8.0 ExcellentNicole, Mar 2026
LGB - OAK
Read more Southwest reviews

Boarding was easy. The seats are small and fairly uncomfortable

The problem with the seat assignments is that there were a lot of rows in the front that were empty but my row at the back was full. Just not so pleasant.

No food or entertainment, just a quick 40 minute flight. A little bumpy due to Santa Ana winds but pilot has no control over that. Good flight and landing!

Good but I prefer choose your own seat. With the new assigned seats they should board from the back I see no advantage to this new boarding. Just like every other airline

Mediocre. Boarding is now unpleasant. The employees, once friendly and nice, are now regularly speaking sternly to passengers, badgering them to do things right so they can take off on time and gate check bags because they don't have enough overhead bin space. The pretzel snack was crushed flat and broken into even smaller pieces, which happens frequently lately. Drink service was suspended before they reached my row.

The charges were ridiculous for an hour flight and the turbulence was very scary.

3 hour delay. Had to change plans and was still delayed.

The flight crew was extremely rude and especially not helpful when our flight was delayed.

The boarding and seat assignment system no longer works for me, but I know it is being replaced. Otherwise, I am good with the overall experience.

The lead steward kept singing about "San Francisco" and hotel California---more annoying than humorous....needs work. Flight was smooth and on time.

Mechanical Delay of over an hour with multiple gate changes. Entertainment system down for rejuvenation.

First class is comfortable. Enjoyed a movie and was able to relax compared to coach.

Same experience as the flight from Norfolk to Atlanta where people are boarded in zones that don't make sense. People behind you on the plane will get on before you and they take the luggage space on your row.

I was happy that I was able to get a last minute flight but unfortunately my seat was a middle seat. Even with Delta Comfort I wasn't comfortable

two hour delay and the Delta representative on the PA system was unable to understand

We waited an hour on the runway to get a gate in Orlando

The staff on board and gate was nice - a welcome change from the usual. We also arrived early, which was a great benefit, given that it takes 30 minutes plus to get bags at SRQ.

Never got on it. Was re-routed through Detroit and am still in airports 12 hours later waiting for my connecting plane to arrive.

The landing was the worst I’ve experienced with a flight.

Smallest leg room I've ever had on a plane.

I will never fly ANA again. They lost one of my large pieces of checked luggage, the heaviest one with the most valuable items in it, and they said they will not send me an email unless they can't find it, even though the paper they gave me to track the status of my lost luggage requires a code from an email they are supposed to send me so I can do baggage tracing. They claim to be an international airline, but they also insist on calling a Japanese telephone number to confirm where to send the lost baggage if they find it. It is impossible to find an actual contact email address for customer support on their website, and their AI chatbot is unhelpful, directing you to a webpage that says it is for contact information but does not have any actual email addresses or phone numbers listed on it. My seat in economy did not recline at all, even though I was not sitting in an exit row nor the very back row. I had to sit in the fully upright position for over ten hours of international travel. Awful experience overall.

Flight delayed for more than 16 hrs and no effort was spent to provide an alternate

Everything was great except for the boarding process. Everyone is lining up all at the same time and it’s hard to tell between the groups as they are way too large.

Overall we had a good experience during our flight from San Francisco to Houston.

it was a very short flight so my expectations were low.

Very disappointing given gate agent behavior. Filed a formal complaint with United.

Flight delayed. WiFi connectivity very poor if not existant. Last minute arrival forced me to run to catch my connection.

The power at the seat didn't work and the seat itself was difficult to adjust - this was a business class seat. Flight attendant gave me miles to compensate. The attendant was very professional and on top of his game the entire flight.

the whole trip was smooth, and as comfortable as flying is these days. flight crew was friendly and very courteous and helpful.

First class ticket gets you a choice of chips or nuts. . Just like economy Southwest. Also no screen in the seats. This is first class???!

A first class seat should fit a fat person, and this doesn't. The trays in the armrest are less functional than an ordinary tray in the back of the seat.

The experience at checkin for my American Airlines flight from Sacramento to LAX was very good including the assistance I received in getting my bags checked in and boarding passes printed. Was pleasantly surprised the my bags were checked through all the way to my destination at Clark International Airport in Angeles, Philippines.

Our flight was delayed 3 times and this is why I am giving such low reviews. Everything else was okay but being in the airport at 4:30pm for my initial flight at 7pm to not leave until after 9:30pm is insane,

Smooth flight. From the early boarding and all were on board before departure time and arrived early in ONT. Great crew. Thank you!!!!

The flight was on time/early, attentive crew, and everything overall went smoothly. Disappointed that WIFI was not working for the flight.

The flight was significantly delayed for 6.5 hours because of snow. There was no communication once the plane returned to the gate regarding when the flight would resume. Other flights were departing while our flight was being unloaded for reasons unknown. Our flight also seemed out of the queue regarding further deicing, refueling, and waiting to Taxi to the runway.

They are always late and seats was also not having working charger

did not have enough meal for first class passengers so offer us snack

Arrived 40 min early which was great - sat in runway for 35 min so no gain. Then waited for luggage 45 min. They need to staff accordingly knowing its one of the busiest week in Phx

Amazing I love American. I’ll never fly anyone else if I can help it.

Our flight was canceled. I will never use Kayak nor Frontier for travel again. The entire experience was a headache.

A 630departure flight Delayed 6hours! They changed my gate, I moved to the new gate. Had our flight on the screen for 12noon departure. I go get above to eat, check screen again and the flight was gone, no notice no announcement, nothing!! They sent my bag on the flight I wasn’t on, got it back to me 3days later. Thank goodness they did refund my money but I will NEVER fly them again.

Plane and crew on board were fine. Everything else was terrible.

Terrible. The canceled my entire flight when I requested a refund for a trip frontier canceled trip one way.

Inbound plane was on time and flight departed on time with no issues while boarding.

i was unable to check in the flight. refund requested

Too many extra fees, uncomfortable, little leg room. Will not recommend this airline.

I think Frontier was very good at communication. Their app worked very well. Loading was great and the flight was nice and easy.

Great for the price. No wifi or entertainment, but gate agents and crew were fantastic and we boarded quickly and left on time.

Disaster. They lied every step of the way. We ended up being delayed due to crew and then allegedly abandoned the flight because of a curfew at LGA. No rebooking to LGA at any reasonable time. No hotel. No meal vouchers. Had to sleep in the airport and fly to Newark instead. Will never fly Frontier again.

Everything you need to know for your flight from Atlanta to Ontario

Information on your arrival and departure airports