£145 Cheap Flights from Atlanta (ATL) to Ontario Intl. Airport (ONT)

View £145 flight on Wed, 24 Jun 2026Opens in a new window

Popular airlines from Hartsfield-Jackson Atlanta International Airport (ATL) to Los Angeles - Ontario Intl. Airport (ONT)

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Cheap Flights from Atlanta (ATL) to Ontario Intl. Airport (ONT)

Prices were available within the past 7 days and start at £145 for one-way flights and £378 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Delta
Sun, 31 May - Mon, 15 Jun
ATL
Atlanta
ONT
Ontario
£378 Return, found 6 days ago
£378
Return
found 6 days ago
Select Delta flight, departing Sun, 31 May from Atlanta to Ontario, returning Mon, 15 Jun, priced at £378 found 6 days ago
Alaska Airlines
Wed, 17 Jun - Wed, 24 Jun
ATL
Atlanta
ONT
Ontario
£398 Return, found 1 day ago
£398
Return
found 1 day ago
Select Alaska Airlines flight, departing Wed, 17 Jun from Atlanta to Ontario, returning Wed, 24 Jun, priced at £398 found 1 day ago
Alaska Airlines
Wed, 17 Jun - Wed, 24 Jun
ATL
Atlanta
ONT
Ontario
£434 Return, found 1 day ago
£434
Return
found 1 day ago
Select Alaska Airlines flight, departing Wed, 17 Jun from Atlanta to Ontario, returning Wed, 24 Jun, priced at £434 found 1 day ago
Alaska Airlines
Wed, 17 Jun - Wed, 24 Jun
ATL
Atlanta
ONT
Ontario
£435 Return, found 1 day ago
£435
Return
found 1 day ago
Select Alaska Airlines flight, departing Wed, 17 Jun from Atlanta to Ontario, returning Wed, 24 Jun, priced at £435 found 1 day ago
Alaska Airlines
Wed, 17 Jun - Wed, 24 Jun
ATL
Atlanta
ONT
Ontario
£472 Return, found 1 day ago
£472
Return
found 1 day ago
Select Alaska Airlines flight, departing Wed, 17 Jun from Atlanta to Ontario, returning Wed, 24 Jun, priced at £472 found 1 day ago
Alaska Airlines
Fri, 15 May - Tue, 19 May
ATL
Atlanta
ONT
Ontario
£489 Return, found 3 days ago
£489
Return
found 3 days ago
Select Alaska Airlines flight, departing Fri, 15 May from Atlanta to Ontario, returning Tue, 19 May, priced at £489 found 3 days ago
Alaska Airlines
Wed, 17 Jun - Wed, 24 Jun
ATL
Atlanta
ONT
Ontario
£490 Return, found 1 day ago
£490
Return
found 1 day ago
Select Alaska Airlines flight, departing Wed, 17 Jun from Atlanta to Ontario, returning Wed, 24 Jun, priced at £490 found 1 day ago
JetBlue Airways
Wed, 17 Jun - Wed, 24 Jun
ATL
Atlanta
ONT
Ontario
£507 Return, found 1 day ago
£507
Return
found 1 day ago
Select JetBlue Airways flight, departing Wed, 17 Jun from Atlanta to Ontario, returning Wed, 24 Jun, priced at £507 found 1 day ago
American Airlines
Wed, 13 May - Wed, 20 May
ATL
Atlanta
ONT
Ontario
£569 Return, found 15 hours ago
£569
Return
found 15 hours ago
Select American Airlines flight, departing Wed, 13 May from Atlanta to Ontario, returning Wed, 20 May, priced at £569 found 15 hours ago
United
Wed, 13 May - Wed, 20 May
ATL
Atlanta
ONT
Ontario
£702 Return, found 15 hours ago
£702
Return
found 15 hours ago
Select United flight, departing Wed, 13 May from Atlanta to Ontario, returning Wed, 20 May, priced at £702 found 15 hours ago

Frequently asked questions

What is the cheapest month to fly from Atlanta, GA (ATL-Hartsfield-Jackson Atlanta Intl.) to Ontario, CA (ONT-Los Angeles - Ontario Intl.)?
September is typically the cheapest month to fly from Hartsfield-Jackson Atlanta International Airport (ATL) to Los Angeles - Ontario International Airport (ONT), with average return fares of approximately £578. This is about 10% lower than the average price throughout the year. September often sees lower prices as the summer travel rush ends and before the holiday season begins, leading to reduced demand. Other cheap months to fly from Atlanta to Ontario include April and May.
Which airlines fly direct from Atlanta, GA (ATL-Hartsfield-Jackson Atlanta Intl.) to Ontario, CA (ONT-Los Angeles - Ontario Intl.)?
Enter ATL to ONT and your travel dates, then apply the 'Nonstop' filter to see only direct flights.
How do I find cheap flights from Atlanta, GA (ATL-Hartsfield-Jackson Atlanta Intl.) to Ontario, CA (ONT-Los Angeles - Ontario Intl.)?
To find a cheap flight from Atlanta, GA (ATL-Hartsfield-Jackson Atlanta Intl.) to Ontario, CA (ONT-Los Angeles - Ontario Intl.), be flexible with your dates. Traveling outside of peak vacation months and booking a mid-week flight can help you save. Early morning and late night flights are often more affordable, too. Expedia allows you to compare flight times, airlines and routes all in one place to find low fares. You can also set up Price Tracking and receive alerts when fares go up or down.
What is the best airline to fly with from Atlanta, GA (ATL-Hartsfield-Jackson Atlanta Intl.) to Ontario, CA (ONT-Los Angeles - Ontario Intl.)?
The best airline to fly with from Atlanta, GA (ATL-Hartsfield-Jackson Atlanta Intl.) (ATL) to Ontario, CA (ONT-Los Angeles - Ontario Intl.) (ONT) will differ from traveller to traveller. If you like to fly early, DL offers early morning flights. If price is the most important factor, DL typically offers the lowest fares. WN offers the most daily flights from Atlanta, GA (ATL-Hartsfield-Jackson Atlanta Intl.) (ATL) to Ontario, CA (ONT-Los Angeles - Ontario Intl.) (ONT), which is brilliant if flexibility is what you value most. The best carrier for this journey could also be the one you have a loyalty membership with, as flying with that airline or another airline within the same alliance could help you collect points or enjoy lounge access.
What is the best time to fly from Atlanta, GA (ATL-Hartsfield-Jackson Atlanta Intl.) to Ontario, CA (ONT-Los Angeles - Ontario Intl.)?
The best time to fly from Hartsfield-Jackson Atlanta Intl. (ATL) to Los Angeles - Ontario Intl. (ONT) is typically September or April. Based on booking data from the past year, these months offer the most budget-friendly options, with average return flights around £578. While we don't have specific popularity data for these months, choosing a time when prices are lower can often mean a more relaxed travel experience.
How many flights per day from Atlanta, GA (ATL-Hartsfield-Jackson Atlanta Intl.) to Ontario, CA (ONT-Los Angeles - Ontario Intl.)?
When flying from Hartsfield-Jackson Atlanta Intl. (ATL) to Los Angeles - Ontario Intl. (ONT), you'll find approximately 3 nonstop flights per day. For even more choice, look at flights that include layovers, as there are around 129 connecting flights daily. Some common connection points include Seattle - Tacoma Intl. (SEA), Dallas-Fort Worth Intl. (DFW), and O'Hare Intl. (ORD).
What is the earliest flight from Atlanta, GA (ATL-Hartsfield-Jackson Atlanta Intl.) to Ontario, CA (ONT-Los Angeles - Ontario Intl.)?
The earliest flight from Hartsfield-Jackson Atlanta Intl. (ATL) to Los Angeles - Ontario Intl. (ONT) typically departs at approximately 5:00 AM local time, operated by American Airlines. This is a seasonal service active in October. An early departure like this can help you maximise your time at your destination. To compare early flights on Expedia, select the "Early Morning" and "Morning" filters in your search.
What day of the week has the most flights from Atlanta, GA (ATL-Hartsfield-Jackson Atlanta Intl.) to Ontario, CA (ONT-Los Angeles - Ontario Intl.)?
You'll typically find the most flights from Hartsfield-Jackson Atlanta Intl. (ATL) to Los Angeles - Ontario Intl. (ONT) on a Friday, with around 73 flights available. This gives you plenty of options for your travel plans. Major airlines on this route include Southwest Airlines, American Airlines, and United Airlines. Friday offers notably more flight options compared to other days of the week.
What are the most popular departure times for flights from Atlanta, GA (ATL-Hartsfield-Jackson Atlanta Intl.) to Ontario, CA (ONT-Los Angeles - Ontario Intl.)?
The most popular departure times for flights from Hartsfield-Jackson Atlanta Intl. (ATL) to Los Angeles - Ontario Intl. (ONT) are in the early morning, from 6am to 9am. Approximately 28% of passengers prefer this time window. Many major carriers, including Southwest Airlines, American Airlines and Frontier Airlines, offer flights during this window. These times work well because you can get an early start to your travel day and arrive at your destination with plenty of time.
How long does it take to fly from Atlanta, GA (ATL-Hartsfield-Jackson Atlanta Intl.) to Ontario, CA (ONT-Los Angeles - Ontario Intl.)?
A nonstop flight from ATL to ONT typically takes around 4 hours 50 minutes, covering approximately 1,894 miles. Connecting flights on this route usually add 2 hours 10 minutes to your travel time. Keep in mind that actual flight times can vary due to wind patterns, weather, and air traffic.
Can you fly business or first class from Atlanta, GA (ATL-Hartsfield-Jackson Atlanta Intl.) to Ontario, CA (ONT-Los Angeles - Ontario Intl.)?
Select the "Business class" and "First class" filters when looking for ATL to ONT flights on Expedia. This is the easiest way to compare prices, routes and flight times for your trip.
How do I earn miles on a Atlanta, GA (ATL-Hartsfield-Jackson Atlanta Intl.) to Ontario, CA (ONT-Los Angeles - Ontario Intl.) flight with Expedia?
It's easy to earn miles on a Atlanta, GA (ATL-Hartsfield-Jackson Atlanta Intl.) to Ontario, CA (ONT-Los Angeles - Ontario Intl.) flight when you book with Expedia. Before you confirm your booking, simply select your frequent flyer program and enter your program number. As a member of One Key™, you can also earn OneKeyCash™* on top of your airline miles when you book with Expedia. *Excludes taxes and fees. OneKeyCash is not redeemable for cash and can only be used on Expedia and other participating brands.
What airports do you fly into for Ontario from Hartsfield-Jackson Atlanta Intl. (ATL)?
If you're planning to travel to Ontario from Hartsfield-Jackson Atlanta Intl. (ATL), you can fly directly into Los Angeles - Ontario Intl. (ONT) Some flights may connect through major hubs like O'Hare Intl. (ORD), George Bush Intercontinental (IAH), Seattle - Tacoma Intl. (SEA) before reaching Ontario. Compare routes and airports on Expedia to find the best flight options for your travel plans.
Is it cheaper to buy a plane ticket from Atlanta, GA (ATL-Hartsfield-Jackson Atlanta Intl.) to Ontario, CA (ONT-Los Angeles - Ontario Intl.) at the last minute?
Typically, booking a last minute flight from Atlanta, GA (ATL-Hartsfield-Jackson Atlanta Intl.) to Ontario, CA (ONT-Los Angeles - Ontario Intl.) will be more expensive than booking in advance. As the departure date approaches, there are usually fewer seats available which can drive up the cost. However, if there's some wiggle room with your travel dates and times, you could bag a cheap last-minute fare.
Is it cheaper to book a Atlanta, GA (ATL-Hartsfield-Jackson Atlanta Intl.) to Ontario, CA (ONT-Los Angeles - Ontario Intl.) flight and hotel package?
Securing a Atlanta, GA (ATL-Hartsfield-Jackson Atlanta Intl.) to Ontario, CA (ONT-Los Angeles - Ontario Intl.) flight and hotel package is usually cheaper than booking separately. With Expedia, you can enjoy the ease of organizing your travels all in one place. Select from our extensive range of stays and then add flights, activities and car rentals to your booking. Bundle everything together, and you could save hundreds of dollars.
Can I cancel or change the date of my flight from Atlanta, GA (ATL-Hartsfield-Jackson Atlanta Intl.) to Ontario, CA (ONT-Los Angeles - Ontario Intl.)?
If you booked your Atlanta, GA (ATL-Hartsfield-Jackson Atlanta Intl.) to Ontario, CA (ONT-Los Angeles - Ontario Intl.) flight within the last 24 hours, you may be able to modify or cancel it without any fees. Depending on the airline and the type of ticket you have, additional charges may apply for changes beyond this timeframe. Airline policies and contact information can be found in your itinerary or confirmation email. Or, head to our Customer Service portal if you'd like more information.

Travel information

Origin airport
Hartsfield-Jackson Atlanta Intl.
Destination airport
Ontario Intl. Airport
Airlines serving
Alaska Airlines, American Airlines, Delta, United
Return price
£378
Distance
3029 km
Average flight time
1 hour 40 mins

Book with confidence

Compare flights from Atlanta to Ontario Intl. Airport easily and book with confidence

For travelling on business or for pleasure, Expedia makes it easy to book your flights from Atlanta to Ontario Intl. Airport. Operating between them flights per day, 20 airlines cover the route. And fly direct, getting you to Ontario Intl. Airport in just hours. If you have a preferred carrier, use our advanced search tool to find the right flight from Hartsfield-Jackson Atlanta Intl. to Ontario Intl. Airport.  

To make things even better, in the advanced search, you can also choose to fly economy, premium economy, business or first class, select your maximum number of stops, and pick your preferred departure and arrival time. You can also opt for refundable and direct flights. 

Grab a great deal on your flight from Hartsfield-Jackson Atlanta Intl. (ATL) to Ontario Intl. Airport (ONT)

The easiest way to view the best deals on flights from Atlanta to Ontario Intl. Airport today is to enter your travel dates and hit search. From here, you can sort your results by price to see the cheapest flights first. Right now, return flights from Hartsfield-Jackson Atlanta Intl. to Ontario Intl. Airport start at just £378 and range up to £702.  

To find an even better deal, try  

  • being flexible on your dates – midweek flights can be cheaper
  • looking for other airports near Atlanta and Ontario Intl. Airport
  • booking your flight during May, the cheapest month on this route
  • varying your flight times – early morning and late at night are sometimes cheaper 

Why you should book your Atlanta to Ontario Intl. Airport flight with Expedia!

We cater for all flight types, cabin classes and airlines. So whether you’re booking flights from Hartsfield-Jackson Atlanta Intl. to Ontario Intl. Airport for a budget break or a business trip with a bit of pleasure thrown in, we make it easy to secure the seat that’s right for you.  

Thanks to our supersized inventory that offers great choice all in one place, you know you’ll get a great deal with Expedia. Especially if you bundle your flight together with your hotel, you will unlock amazing savings. For added peace of mind, you can choose flexible bookings or filter to find refundable options, so you won’t pay a fee to change your flight.  

Compare flights from Atlanta to Ontario Intl. Airport easily and book with confidence

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