ATL - ONT

$136 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 6/24. 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
$278
Typical prices: $458-$197
Frontier
Wed 6/24Mon 6/29
ATL - ONT • 1 stop
Cheapest non-stop
$439
Typical prices: $659-$339
Delta
Fri 9/11Tue 9/15
ATL - ONT • Non-stop
Nonstop flights
You can fly direct with Delta. Average duration is 4h 29m
Direct flights
Direct flights
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Direct flights
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)
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 12% compared to booking last minute.
Insights
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When to travel
Cheapest • 44% price drop
Most popular
Good to know
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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, Jun 24 - Mon, Jun 29
Frontier Logo
10:54 am - 4:48 pm
ATL
-
ONT
8h 54m
1 stop
Frontier Logo
5:43 pm - 10:01 am
ONT
-
ATL
13h 18m
1 stop
$278Frontier
Tue, Jul 7 - Wed, Jul 22
Frontier Logo
7:11 pm - 8:03 am
ATL
-
ONT
15h 52m
1 stop
Frontier Logo
1:38 pm - 6:59 am
ONT
-
ATL
14h 21m
1 stop
$282Frontier
Wed, Sep 9 - Tue, Sep 15
Frontier Logo
8:47 pm - 2:37 pm
ATL
-
ONT
20h 50m
1 stop
Frontier Logo
2:58 pm - 2:03 pm
ONT
-
ATL
20h 05m
1 stop
$283Frontier
Thu, Jul 9 - Sat, Jul 18
Frontier Logo
9:25 pm - 7:32 am
ATL
-
ONT
13h 07m
1 stop
Frontier Logo
9:32 am - 11:24 pm
ONT
-
ATL
10h 52m
1 stop
$284Frontier
Sat, Jun 27 - Sat, Jul 4
Frontier Logo
8:40 pm - 10:05 am
ATL
-
ONT
16h 25m
1 stop
Frontier Logo
10:50 am - 11:38 am
ONT
-
ATL
21h 48m
1 stop
$285Frontier
Sat, Sep 5 - Tue, Sep 22
Frontier Logo
10:54 am - 4:48 pm
ATL
-
ONT
8h 54m
1 stop
Frontier Logo
6:00 am - 3:33 pm
ONT
-
ATL
6h 33m
1 stop
$287Frontier
Thu, Jul 2 - Tue, Jul 7
Frontier Logo
10:54 am - 4:48 pm
ATL
-
ONT
8h 54m
1 stop
Frontier Logo
9:32 am - 11:24 pm
ONT
-
ATL
10h 52m
1 stop
$288Frontier
Tue, Aug 4 - Tue, Aug 18
Frontier Logo
8:30 pm - 11:50 pm
ATL
-
ONT
30h 20m
1 stop
Frontier Logo
6:00 am - 4:58 am
ONT
-
ATL
19h 58m
1 stop
$289Frontier
Mon, Jun 22 - Wed, Jun 24
Frontier Logo
7:11 pm - 7:51 pm
ATL
-
ONT
27h 40m
1 stop
Frontier Logo
1:33 pm - 6:57 am
ONT
-
ATL
14h 24m
1 stop
$290Frontier
Sat, Jun 20 - Sat, Jun 27
Frontier Logo
8:45 am - 5:52 pm
ATL
-
ONT
12h 07m
1 stop
Frontier Logo
10:50 am - 5:02 am
ONT
-
ATL
15h 12m
1 stop
$296Frontier
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 Wednesday 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 $483 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 12% 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 seasonSeptember
Cheapest flight$136
Best time to beat the crowds with an average 1% drop in price.
Most popular time to fly and prices are also 28% 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 $136 for a one-way ticket and $278 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, 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 $457 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 $516 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 $468 or less one-way and $498 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 4262 reviews
8.6Crew
8.0Comfort
8.1Boarding
7.5Entertainment
7.0Food
Airline reviews

The first time I flew in the extra legroom section. It was difficult to notice a difference. I had bad luck with my neighbors. The crew was okay. Southwest has reduced the live TV options.

4.0 OkayAnonymous, May 2026
MDW - LAX
Read more Southwest reviews

The first time I flew in the extra legroom section. It was difficult to notice a difference. I had bad luck with my neighbors. The crew was okay. Southwest has reduced the live TV options.

No gluten free snacks. Seats felt worn or bare bones even though it was a new 737 MAX 8.

Plane was clean and comfortable. Flight attendants and gate staff were professional, friendly and efficient. Boarding and deplaning were orderly and efficient. All in all, the typical excellent Southwest experience.

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

No service flight that took 5 hrs and a stop at an unscheduled airport. Crew and pilots did their jobs

For some reason, TSA Atlanta didn’t have my bag on the flight on time and they don’t have to provide Delta a reason for that.

Delta does a great job with entertainment and free wifi. I can still be in touch with my colleagues while in the air.

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.

Seat pitch is horrible especially on the 15 hour flight. Gate crew at SFO was Outstanding. The flight crew was also great.

6 1/2 hours from Tampa to SFO on a Boeing 737. Cramped. No Service. No real food. One pass for coffee at the beginning and a second pass THREE hours later. And check-in in Tampa was nasty even by United standards. And I am at almost TWO million miles on United. It's a non-stop. But terrible service.

First class ticket gets you no seat back entertainment? I have to bring my own laptop to see a movie? And most of their movies have ADS? No thank you. Worse: Tiny snacks only on a 2 hr flight?

Late plane. Only one crew on the ground so we b had to wait for Denver flight to come in, board, and depart. At 78 yrs of age I was not pleased trying to get my connection. What really made me angry was the notification you sent me to hurry up or I would miss my connection. Why tell me to hurry up when you got me in late. It was not a good way of treating customers.

No complaints other than luggage carousel was incorrectly guiding passengers to the wrong carousel on the screen.

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

Was put into a seat right behind the toilet that had no entertainment possible but did have plenty of leg room over noisy part of plane.

So overall the flight was just average and nothing special. They overbooked some of the flights and they ended up running out of overhead storage space so we had to check our carry-ons which wasn't terrible but we were inconvenienced because of the second connecting flight with a long layover we couldn't get our bags until the final destination. Most of the flight attendants were pretty good and overall the meals were not that great because the chicken was dry and overcooked. They also didn't provide butter or any kind of spread with the bread which is cheap and concerning. The American airlines staff at the check-in counter was kind of unprofessional because this lady just started singing in the middle of checking us in and that's weird. The worst part of the flights was the terrible conditions of the bathrooms which were unclean and did not have toilet paper or toilet tissue available which is kind of insane for a 14-hour and 8 and 1/2 hour flight.

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.

There weren't enough employees at check in took awhile to get bags checked. There wasn't a wheel chair for me, I was sent to someone who turns out to work for a different airline, if My flight hadn't been delayed I probably would have missed my flight as it was, by the time I arrived at my gate, they started boarding in about 15 minutes. I don't know who took me to my gate, definitely was not the normal people who take passengers to the gate. I'm guessing she may have been in a management position. I wish I knew her name, she went beyond to help me. With that said everyone was kind, and were doing the best they could. So, I choose to say it was an Adventure, stressful start, but good. In the end went well. The situation was not only difficult for passengers but the employee's.

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.

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

Information on your arrival and departure airports