$369 Cheap United flights from Atlanta to Ontario (ATL to ONT)

Find The Best Day To Fly from Atlanta to Ontario

Amazing United ATL to ONT Flight Deals

The cheapest flights to Los Angeles - Ontario Intl. found within the past 7 days were $339 round trip and $369 one way. Prices and availability subject to change. Additional terms may apply.

Mon, Mar 2 - Sat, Mar 7
ATL
Atlanta
ONT
Ontario
$339 Roundtrip, found 12 hours ago
$339
Roundtrip
found 12 hours ago
Select United flight, departing Mon, Mar 2 from Atlanta to Ontario, returning Sat, Mar 7, priced at $339 found 12 hours ago

ONT From ATL Economy Coach Packages on Similar Airlines

Price found within the past 48 hours. Click for updated prices.
Travel Inn And Suites

Travel Inn And Suites

2.5 out of 5
Price was $548, price is now $283 per person
$283
per person
Oct 9 - Oct 13
found 14 hours ago
Roundtrip flight included
Atlanta (ATL) to Ontario (ONT)
Home2 Suites By Hilton Riverside Downtown

Home2 Suites By Hilton Riverside Downtown

3 out of 5
Save 100% on your flight
Price was $811, price is now $531 per person
$531
per person
Oct 23 - Oct 28
found 20 hours ago
Roundtrip flight included
Atlanta (ATL) to Ontario (ONT)
Hampton Inn & Suites Ontario Rancho Cucamonga

Hampton Inn & Suites Ontario Rancho Cucamonga

2.5 out of 5
Save 100% on your flight
Price was $564, price is now $383 per person
$383
per person
Nov 6 - Nov 10
found 1 day ago
Roundtrip non-stop flight included
Atlanta (ATL) to Ontario (ONT)
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Frequently asked questions

Can I catch a flight from Hartsfield–Jackson Atlanta International Airport to Los Angeles - Ontario Intl. Airport (ONT) right now?
It's wise to know about any quarantine requirements and travel advice reports in place in your destination. Make sure you check out our Covid-19 Travel Advisor for up-to-date information on flying to Ontario Airport from Hartsfield-Jackson Atlanta Intl. Airport (ATL).
What terminal is United Airlines at Atlanta Airport?
Once you're issued with the boarding pass for your United Airlines flight from ATL to Los Angeles - Ontario Intl. Airport (ONT), you should be able to determine which terminals you'll be flying in and out of. Your airline will have the answers if those details are missing from your ticket.
Are there United Airlines non-stop flights from ATL to ONT?
You won't find any direct flights between ATL and ONT with United Airlines. Get ready to make a stopover if you need to travel on this particular airline and route.
How long is a United Airlines flight from ATL to ONT?
Squeeze in an in-flight snooze and start your vacation feeling refreshed. You'll have plenty of time to do so when traveling with United Airlines between Hartsfield-Jackson Atlanta Intl. Airport (ATL) and Ontario Airport, with the flight taking around 6 hours.
How many direct and indirect flights does United Airlines fly from ATL to ONT?
If you want to book a jaunt from ATL to ONT, you can choose from 2 United Airlines flights per day.
If I am not able to travel due to COVID-19, can I change my booking to a later date?
For more info about changing your flight to ONT, please visit our Customer Service Portal.
What is the best day to buy a plane ticket?
This just in! Airfares offered on Thursdays tend to be the cheapest, according to flight demand on Travelocity in 2021. Tuesday and Wednesday prices are also good, but you may want to prepare your budget if booking during the weekend, as data shows that is when prices are generally at their highest.
What are the cheapest days to fly?
Frequent travelers may already know this, but earlier in the week can be the cheapest time to fly. In 2021, flights departing on a Monday were generally the cheapest of the week, whereas you may pay a premium for weekend flights when demand is usually high. On average, tickets were most expensive for Saturday departures, so if you need to fly out on a weekend, you might look for deals ahead of time.
How far in advance can you book a flight?
Trying to figure out how early you should book your flight? It's possible to start comparing international airfares on Travelocity up to 12 months in advance. However, it does depend on the carrier as not all airlines release their prices that far out. According to our 2021 flight demand trends, last minute planners can still bag a bargain with some of the cheapest fares appearing 0-2 weeks prior to their travel dates.*According to flight demand on Travelocity.com from January to December 2021. Savings are subject to change based on departure location, date and destination.

Discover our best United flight from Atlanta ATL to Ontario ONT 

To find the best deals on flights to Atlanta from Ontario with United, just enter your travel dates, filter by United, and hit search. You’ll find flights to choose from and can sort by price, flight duration, and arrival or departure time.  

 

Return flights from Atlanta ATL to Ontario ONT with United 

If you’re planning a round trip, booking return flights with United is usually the most cost-effective option. With airfares ranging from $339 to $369, it’s easy to find a flight that suits your budget. Prices and availability subject to change. Additional terms may apply. 

 

Book one-way United flights from Atlanta ATL to Ontario ONT 

A one-way ticket gives you much greater flexibility—allowing you to choose your return date, destination, and time whenever you’re ready. By booking in advance you can find great deals on one-way tickets too. Right now, a one-way United flight from Atlanta to Ontario costs from $369. Prices and availability subject to change. Additional terms may apply. 

 

The easy way to find cheap flights to Ontario ONT from  Atlanta ATL with United 

To find a cheap United flight from Atlanta ATL to Ontario ONT, sort your search results by price or filter by budget. Thanks to Travelocity’s Price Match Promise, if you find a better airfare deal anywhere else within 24 hours, we’ll credit or refund the difference. 

 

How to find our best airfare deals on United flights from Atlanta ATL to Ontario ONT 

If you’re looking for cheap flights, it helps to be flexible when it comes to your travel dates. You’ll usually find lower cost tickets when you travel during quieter months such as March, or if you book a flight with a stopover. 

 

Find nonstop flights from Atlanta ATL to Ontario ONT with United 

If you’re keen to be on Ontario soil fast, don’t waste time with a stopover—filter your search results to show direct United flights only. The journey takes around hour(s) min(s) – so you’ll be there before you know it. 

 

Flexible airline tickets for United flights from Atlanta ATL to Ontario ONT 

Make sure you’re not out of pocket if plans change by choosing a flexible ticket with penalty-free amendment and cancellation options. Use our ‘no change fee’ filter to see which flights have this option.  

 

There are a lot of reasons to book your flights to Ontario ONT from  Atlanta ATL with United on Travelocity 

At Travelocity our vast and up-to-the-minute inventory puts all of our best flight deals in one place. So, whether you’re traveling on business or jetting off with friends and family, you can trust Travelocity to get you there.

United Airports
Hop on a(n) United flight today by flying to many destinations out of these domestic and international airports:
Airport code
Country
Airport name
Number of flights
ORDUSAO'Hare Intl.227
DENUSADenver Intl.226
IAHUSAGeorge Bush Intercontinental136
IADUSAWashington Dulles Intl.100
SFOUSASan Francisco Intl.64
LAXUSALos Angeles Intl.23
EWRUSALiberty Intl.20
FRADEUFrankfurt Intl.19
NRTJPNNarita Intl.19
PEKCHNCapital Intl.16

Travelers ❤️ these 🏨 after their flight to Ontario

DoubleTree by Hilton Ontario Airport

DoubleTree by Hilton Ontario Airport

4 out of 5
222 N Vineyard Ave, Ontario, CA
This smoke-free hotel features a nightclub and 2 restaurants. Traveling on business? Take advantage of the 24-hour business center, free WiFi in public areas, ...
8/10 Very Good! (1,009 reviews)
"Staff was very friendly and knowledgeable."

Reviewed on Sep 19, 2025

DoubleTree by Hilton Ontario Airport
Ontario Airport Hotel & Conference Center

Ontario Airport Hotel & Conference Center

3.5 out of 5
700 N Haven Ave, Ontario, CA
This hotel features an outdoor pool, a 24-hour gym, and a restaurant. Traveling on business? Take advantage of the 24-hour business center and free WiFi in public ...
8.6/10 Excellent! (2,924 reviews)
"Nice place"

Reviewed on Sep 19, 2025

Ontario Airport Hotel & Conference Center
Extended Studio Hotel Ontario

Extended Studio Hotel Ontario

2.5 out of 5
1818 E Holt Blvd, Ontario, CA
This hotel doesn't skimp on freebies - guests receive free WiFi and free self parking. Business travelers can take advantage of the business center. A terrace, ...
9/10 Wonderful! (730 reviews)
"I like staff"

Reviewed on Sep 25, 2025

Extended Studio Hotel Ontario
Lowest nightly price found within the past 24 hours based on a 1 night stay for 2 adults. Prices and availability subject to change. Additional terms may apply.
*Price based on the lowest price found within past 24 hours and based upon one night stay for two adults over the next thirty days. Prices and availability subject to change. Additional terms may apply.