ATL - ONT

$85 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 6/3. 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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Everything you should know

Cheapest round-trip
$180
Typical prices: $486-$272
Frontier
Wed 7/1Tue 7/7
ATL - ONT • 1 stop
Cheapest non-stop
$439
Typical prices: $579-$399
Delta
Thu 7/2Wed 7/8
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 36m
Direct flights
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Avoid delays
Most punctual • 80% on-time
Best time • Fewest delays
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Top layover airports
Cheapest • Avg $209 (round-trip)
Shortest trip • 6h 00m (one-way)
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When to book
in advance
Our data shows that travelers who book at least 2 weeks in advance save around 6% compared to booking last minute.
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When to travel
Cheapest • 42% price drop
Most popular
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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

Wed, Jul 1 - Tue, Jul 7
Frontier Logo
7:40 am - 11:49 pm
ATL
-
ONT
19h 09m
1 stop
Frontier Logo
3:40 pm - 12:17 am
ONT
-
ATL
29h 37m
2 stops
$180Frontier
Tue, May 26 - Fri, May 29
Frontier Logo
12:33 pm - 10:05 am
ATL
-
ONT
24h 32m
1 stop
Frontier Logo
8:59 am - 6:15 am
ONT
-
ATL
18h 16m
1 stop
$190Frontier
Tue, Sep 1 - Tue, Sep 8
Frontier Logo
12:33 pm - 11:49 pm
ATL
-
ONT
14h 16m
1 stop
Frontier Logo
6:00 am - 4:58 am
ONT
-
ATL
19h 58m
1 stop
$197Frontier
Tue, May 26 - Sat, May 30
Frontier Logo
12:33 pm - 10:05 am
ATL
-
ONT
24h 32m
1 stop
Frontier Logo
5:59 pm - 9:22 am
ONT
-
ATL
12h 23m
1 stop
$198Frontier
Fri, May 29 - Tue, Jun 2
Frontier Logo
2:32 pm - 7:11 pm
ATL
-
ONT
7h 39m
1 stop
Frontier Logo
8:06 pm - 2:30 pm
ONT
-
ATL
15h 24m
1 stop
$200Frontier
Wed, May 27 - Wed, Jun 24
Frontier Logo
10:21 am - 11:49 pm
ATL
-
ONT
16h 28m
2 stops
Frontier Logo
6:00 am - 5:02 am
ONT
-
ATL
20h 02m
1 stop
$201Frontier
Tue, Jun 2 - Tue, Jun 9
Frontier Logo
11:15 am - 3:44 pm
ATL
-
ONT
7h 29m
1 stop
Frontier Logo
6:43 pm - 2:30 pm
ONT
-
ATL
16h 47m
1 stop
$202Frontier
Thu, May 28 - Tue, Jun 2
Frontier Logo
9:25 pm - 7:08 am
ATL
-
ONT
12h 43m
1 stop
Frontier Logo
8:06 pm - 9:04 am
ONT
-
ATL
9h 58m
1 stop
$206Frontier
Fri, May 29 - Tue, Jun 2
Frontier Logo
7:35 am - 10:05 am
ATL
-
ONT
29h 30m
1 stop
Frontier Logo
8:06 pm - 9:04 am
ONT
-
ATL
9h 58m
1 stop
$207Frontier
Sun, Jun 7 - Wed, Jun 10
Frontier Logo
6:03 am - 7:08 am
ATL
-
ONT
28h 05m
1 stop
Frontier Logo
1:33 pm - 5:28 am
ONT
-
ATL
12h 55m
1 stop
$209Frontier
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.

How much is a round-trip flight from Atlanta to Ontario?

This analysis is based on the cheapest round-trip price found on KAYAK in the last 12 months by searching for a flight from Atlanta to Ontario departing in July.

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 $232 (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 $476 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 6% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 3 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 seasonSeptember
Cheapest flight$85
Best time to beat the crowds with an average 1% drop in price.
Most popular time to fly and prices are also 21% 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 $85 for a one-way ticket and $180 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, American Airlines, and JetBlue 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?

    oneworld, Star Alliance, and SkyTeam are the airline alliances operating flights between Atlanta and Ontario, with oneworld 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, Delta or Southwest?

    The two airlines most popular with KAYAK users for flights from Atlanta to Ontario are Delta and Southwest. With an average price for the route of $513 and an overall rating of 7.9, Delta is the most popular choice. Southwest is also a great choice for the route, with an average price of $449 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 $428 or less one-way and $539 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.
7.9
SouthwestOverall score based on 4305 reviews
7.0Food
8.0Comfort
8.6Crew
8.1Boarding
7.5Entertainment
Airline reviews

Not having a five hour delay with little notice! The crew was very kind, though, and just as tired as we passengers were. The flight didn't depart until nearly 1 am...and no reason was ever given.

2.0 MediocreAnonymous, May 2026
SEA - SMF
Read more Southwest reviews

Not having a five hour delay with little notice! The crew was very kind, though, and just as tired as we passengers were. The flight didn't depart until nearly 1 am...and no reason was ever given.

This leg was much better, but we did have to have a 3 hour lay o er after coming from a very exhausting hiccup with our flight from BNA to Den

The Air hostess were very rude on my flight from Houston to Austin . Their regular communication itself felt a they are shouting at people.

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.

In a world of delays, Delta was on time both ways! Boarding was fast and efficient. Staff was friendly. AND wifi worked.

No entertainment. Plane was so small had to pink tag a carry on ive used for 20 years easily on board. The fact the flight got in at midnight, had to wait for crew in fort wayne to allow the plane to approach the gate, THEN had to wait for bag on jet bridge made experience irritating at best.

Overall Good! The weather delayed our takeoff from Atlanta and our arrival in Miami! If Mother Nature can mess up a flight she will do it every time!

Subpar. The seating on the plane is almost unbearable. We are literally touching and/or sitting on each other which is totally unacceptable and shameful. Pilots and crew was very accommodating and friendly.

During the flight, the only refreshments provided were crackers and soft drinks; no substantial food was offered despite the international route. Furthermore, our initial flight was delayed, causing us to miss the connecting flight in Atlanta. The airline did not hold the connection, and we were informed that the next available flight is not for another 24 hours. While I am aware of alternative options via JetBlue, they operate out of JFK, which is not a viable solution for us as a resident of New Jersey.

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

Outstanding service, efficient & friendly crew, flight was safe, comfortable & on time

The crew was great. Very friendly and responsive. The plane was old, small and tight. We ran out of overhead space and I had to check. Middle seat was particularly tight.

The flight was delayed from take off because only one runway was operational in San Francisco.

Several missed and almost missed connections. It felt like everything was being patched together last minute without enough resources and it ended up being an extremely stressful experience that basically ruined our weekend on the west coast. What a waste.

Packed in plane small uncomfortable seats elbow to elbow nobody wants to be in that situation for the money they paid

Checking in united could not figure out my star alliance gold. Baggage did not get marked priority and didn't receive boarding passes. When got to SFO lounge personal fixed everything Immediately

I had a terrible experience. My flight got delayed from Atlanta to Chicago on Monday April 6, 2026, and that led to me missing my next flight to Brussels. United Airlines didn’t provide me with any accommodation for shelter. I had to sleep at the airport in Chicago. The next flight I was put on didn’t leave until the evening hours of Tuesday 4/7/2026.

Flight left on time, arrived early, pleasant staff provided water, coffee, etc. access to bathrooms was reasonable and were well maintained. blankets were available, lots of entertainment options. LUGGAGE SERVICE WAS GREAT. I got my one checked bag quickly and was able to make a bus connection for a 2 hour bus ride saving me from waiting another 1.5 hours.

Just a bad day to fly. Flight was delayed from scheduled 6:50 pm departure to 8:50 pm. Combination of factors mostly related to weather at the destination airport (which is where the incoming flight originated) which delayed the inbound flight over an hour. Once on board, we taxied but had to hold again on the taxiway for 10 minutes or so. We did not get wheels up until after 9 pm. The flight was smooth but about 18 minutes from our destination, we had to hold for several minutes more due to weather at ORD. We finally landed at ORD about 11:08 pm (accounting for the time difference, that was about a 3 hour delay from our scheduled departure time). It felt like we were never going to get to our destination. But the flight crew and attendants were very good. The movie selection onboard was also very nice. Got to watch half of a movie just during our taxi from the gate at ATL due to the delay!

Terrible, if possible won't be flying again anytime soon!

This was a hard flight. 3 delays out of OKC (1 on the Tarmac). Delay in Atlanta coming to Dallas. total travel time was the equivalent of driving from OKC to Atlanta.

American delayed the flight for a crew rest period. The delay occurred late in the evening - the earliest i can find is 10:20 pm. With a 6 am flight anyone on the flight would have already have been asleep (unless you are insane, a vampire or on drugs) and at least for me i was already on the way to the airport at 445 am the next morning when i discovered they delayed the flight until 9 am. Given the incoming flight was in the air at 6 pm the evening before this should have been figured out a lot more timely that was there only crew to use. Just frustrating given there is no consideration for customer experience anymore in flying.

Flight: Started on time. Comfortable flight. Arrived on time. Crew: Very cordial and helpful. Drinks and snack was served with a smile. Overall enjoyed the trip. Regards, Hari Doss Chanchala Doss

To have arrived on time and not 3 hours late after having already spent $100 to change to an earlier flight, only to arrive back home close to the original flight time.

American Airlines is a miserable experience. It is predictably miserable, in the sense that every time I fly American, I brace myself for the certainty that it will be unpleasant and uncomfortable. But it is unpredictable in the sense that I never know if the flight will be on time or delayed nine hours (both happened to me this week). I never know if I will be able to sit in the seat that I selected when I purchased the ticket or if I will be told by Customer Service (!!!) that I must relocate from first class to a seat in the back of the aircraft with no explanation (both happened to me this week). Will the food be frozen and half defrosted, or scalding hot? Will the drinks be warm? Will the flight attendants be surly and mean? Will the toilets be cramped and foul? Will the seats be narrow and uncomfortable? Will there be a real electric outlet at the seat, or just an unreliable USB-2 port? Will there be enough seats in the boarding lounge or just a few? Will the boarding process be smooth and efficient, or will the gate agents mess it up and delay it needlessly for 30 or 40 minutes? Will the catering and cleaning crew be prompt or will they take an extra 30 minutes? Will the brakes on the aircraft work properly, or will the pilot delay takeoff for four hours while the ground crew attends to what can only be described as routine maintenance that should have been done the night before? I've eexperienced every one of these unpleasant things this year, 2026. The only thing I can reliably count on is that American will find a new way to make the experience of flying as miserable as they possibly can.

Wifi was spotty. Tray table was very dirty when I sat down.

Very disappointing. Flight was delayed by 1.5 hours and food options are very underwhelming even for first class seats (same food given to economy seats)

The WiFi would not connect enough for me to do my actual work. It permaspooled, disconnected, said it was connected, then wouldn't open an email... it was frustrating. I am not a tall person, 5'4" - and I felt cramped with little room to reach into my bag under the seat in front of me. I feel sorry for anyone taller than me having to fly. the one positive thing I will add, is the overhead bins are roomy enough to manage more bags than other carriers.

Going non stop to lax like I paid for. Not stopping in MCI for gas. Too long of delays

Delayed for mechanical and no updates on what was happening and how long the delay might be.

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