$82+ Cheap flights from Atlanta to Ontario (ATL - ONT)
This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 5/12. Fares are subject to change and may not be available on all flights or dates of travel.
ATL — ONT
mei. 22 — mei. 291
Round-trip
1 adult, Economy
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Find cheap flights from Atlanta to Ontario with Cheapflights
1. Tell us where you want to go
Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”2. Select your favorite providers
We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.3. Compare prices and book
Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.Cheapflights Tip: The best prices from Atlanta Hartsfield-Jackson to Ontario are usually found in October or June, booked 48 days in advance, depart on a Tuesday or Wednesday and return on a Tuesday
Cheap flight deals from Atlanta to Ontario
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Best
Last-minute
One-way
Cheapest flights from Atlanta to OntarioExplore the most affordable flight options available from Atlanta to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on april 22, 2026.
Explore the most affordable flight options available from Atlanta to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on april 22, 2026.
This Cheapflightsfares deal was found by Cheapflights users on 4/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vr 5/156:03 am
ATL
- ONT
1 stop29h 17m
Frontier
ma 5/188:06 pm
ONT
- ATL
1 stop10h 21m
Frontier
Deal found 4/20![Frontier logo]()
$159
This CheapOair deal was found by Cheapflights users on 4/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vr 5/87:11 pm
ATL
- ONT
1 stop22h 58m
Frontier
ma 5/118:06 pm
ONT
- ATL
1 stop24h 15m
Frontier
Deal found 4/17![Frontier logo]()
$160
This Booking.com deal was found by Cheapflights users on 4/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
za 5/1611:15 am
ATL
- ONT
1 stop11h 17m
Frontier
vr 5/228:06 pm
ONT
- ATL
1 stop15h 05m
Frontier
Deal found 4/18![Frontier logo]()
$162
This Booking.com deal was found by Cheapflights users on 4/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
di 5/197:11 pm
ATL
- ONT
1 stop23h 33m
Frontier
za 5/238:43 am
ONT
- ATL
1 stop8h 12m
Frontier
Deal found 4/17![Frontier logo]()
$167
This Cheapflightsfares deal was found by Cheapflights users on 4/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
di 5/57:11 pm
ATL
- ONT
1 stop23h 33m
Frontier
di 5/128:06 pm
ONT
- ATL
1 stop9h 58m
Frontier
Deal found 4/17![Frontier logo]()
$179
This Kiwi.com deal was found by Cheapflights users on 4/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
za 5/99:25 pm
ATL
- ONT
1 stop13h 10m
Frontier
wo 5/276:00 am
ONT
- ATL
2 stops35h 11m
Frontier
Deal found 4/18![Frontier logo]()
$183
This Cheapflightsfares deal was found by Cheapflights users on 4/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
do 5/147:35 am
ATL
- ONT
1 stop29h 30m
Frontier
zo 5/178:06 pm
ONT
- ATL
1 stop25h 03m
Frontier
Deal found 4/17![Frontier logo]()
$184
This Frontier deal was found by Cheapflights users on 4/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
wo 5/2011:15 am
ATL
- ONT
1 stop7h 29m
Frontier
zo 5/248:03 am
ONT
- ATL
1 stop8h 52m
Frontier
Deal found 4/19![Frontier logo]()
$185
This Trip.com deal was found by Cheapflights users on 4/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
wo 5/2011:15 am
ATL
- ONT
1 stop7h 29m
Frontier
wo 5/274:39 pm
ONT
- ATL
1 stop11h 29m
Frontier
Deal found 4/21![Frontier logo]()
$186
This Kiwi.com deal was found by Cheapflights users on 4/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
do 4/309:15 pm
ATL
- ONT
1 stop22h 23m
Frontier
vr 5/88:06 pm
ONT
- ATL
1 stop25h 10m
Frontier
Deal found 4/18![Frontier logo]()
$190
This Mytrip deal was found by Cheapflights users on 4/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
ma 5/118:45 am
ATL
- ONT
1 stop25h 50m
Frontier
di 5/198:06 pm
ONT
- ATL
1 stop25h 03m
Frontier
Deal found 4/21![Frontier logo]()
$192
This Cheapflightsfares deal was found by Cheapflights users on 4/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vr 5/86:03 am
ATL
- ONT
1 stop29h 17m
Frontier
di 5/128:06 pm
ONT
- ATL
1 stop9h 58m
Frontier
Deal found 4/20![Frontier logo]()
$194
Best flights from Atlanta to OntarioDiscover carefully curated flight deals from Atlanta to Ontario that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated april 22, 2026.
Discover carefully curated flight deals from Atlanta to Ontario that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated april 22, 2026.
This Delta deal was found by Cheapflights users on 4/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
za 5/309:22 am
ATL
- ONT
Nonstop4h 35m
Delta
ma 6/810:00 pm
ONT
- ATL
Nonstop4h 15m
Delta
Deal found 4/20![Delta logo]()
$439
This Southwest deal was found by Cheapflights users on 4/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
wo 6/176:35 am
ATL
- ONT
2 stops9h 20m
Southwest
wo 6/246:25 pm
ONT
- ATL
2 stops8h 20m
Southwest
Deal found 4/17![Southwest logo]()
$469
This Delta deal was found by Cheapflights users on 4/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
zo 7/59:15 am
ATL
- ONT
Nonstop4h 25m
Delta
do 7/1611:48 am
ONT
- ATL
Nonstop4h 27m
Delta
Deal found 4/21![Delta logo]()
$439
This Delta deal was found by Cheapflights users on 4/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
do 7/99:21 am
ATL
- ONT
Nonstop4h 17m
Delta
zo 7/1210:00 pm
ONT
- ATL
Nonstop4h 18m
Delta
Deal found 4/17![Delta logo]()
$439
This Delta deal was found by Cheapflights users on 4/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
wo 5/277:30 pm
ATL
- ONT
1 stop7h 04m
Delta
di 7/710:00 pm
ONT
- ATL
Nonstop4h 18m
Delta
Deal found 4/19![Delta logo]()
$449
This Delta deal was found by Cheapflights users on 4/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
do 5/2810:15 am
ATL
- ONT
1 stop9h 02m
Delta
di 6/212:07 pm
ONT
- ATL
Nonstop4h 17m
Delta
Deal found 4/20![Delta logo]()
$449
This Delta deal was found by Cheapflights users on 4/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
di 5/129:22 am
ATL
- ONT
Nonstop4h 35m
Delta
di 5/1910:00 pm
ONT
- ATL
Nonstop4h 14m
Delta
Deal found 4/19![Delta logo]()
$489
This Delta deal was found by Cheapflights users on 4/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
do 5/149:22 am
ATL
- ONT
Nonstop4h 35m
Delta
wo 5/2010:00 pm
ONT
- ATL
Nonstop4h 14m
Delta
Deal found 4/17![Delta logo]()
$490
This Delta deal was found by Cheapflights users on 4/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
do 7/168:19 pm
ATL
- ONT
Nonstop4h 25m
Delta
zo 7/1910:00 pm
ONT
- ATL
Nonstop4h 18m
Delta
Deal found 4/21![Delta logo]()
$509
This Delta deal was found by Cheapflights users on 4/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
ma 6/89:15 am
ATL
- ONT
Nonstop4h 25m
Delta
ma 6/1510:00 pm
ONT
- ATL
Nonstop4h 15m
Delta
Deal found 4/22![Delta logo]()
$509
This Delta deal was found by Cheapflights users on 4/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
ma 6/85:57 pm
ATL
- ONT
1 stop8h 48m
Delta
zo 6/2110:00 pm
ONT
- ATL
Nonstop4h 15m
Delta
Deal found 4/18![Delta logo]()
$519
This Delta deal was found by Cheapflights users on 4/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
di 5/195:30 pm
ATL
- ONT
1 stop9h 04m
Delta
za 8/87:05 am
ONT
- ATL
Nonstop4h 18m
Delta
Deal found 4/18![Delta logo]()
$519
Last-minute flights from Atlanta to OntarioDiscover last-minute flight deals from Atlanta to Ontario. Data last updated april 22, 2026 and is based on user searches.
Discover last-minute flight deals from Atlanta to Ontario. Data last updated april 22, 2026 and is based on user searches.
This Kiwi.com deal was found by Cheapflights users on 4/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
do 4/309:15 pm
ATL
- ONT
1 stop22h 23m
Frontier
vr 5/88:06 pm
ONT
- ATL
1 stop25h 10m
Frontier
Deal found 4/18![Frontier logo]()
$190
This Cheapflightsfares deal was found by Cheapflights users on 4/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
di 5/57:11 pm
ATL
- ONT
1 stop23h 33m
Frontier
di 5/128:06 pm
ONT
- ATL
1 stop9h 58m
Frontier
Deal found 4/17![Frontier logo]()
$179
This CheapOair deal was found by Cheapflights users on 4/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vr 5/87:11 pm
ATL
- ONT
1 stop22h 58m
Frontier
ma 5/118:06 pm
ONT
- ATL
1 stop24h 15m
Frontier
Deal found 4/17![Frontier logo]()
$160
This Cheapflightsfares deal was found by Cheapflights users on 4/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vr 5/86:03 am
ATL
- ONT
1 stop29h 17m
Frontier
di 5/128:06 pm
ONT
- ATL
1 stop9h 58m
Frontier
Deal found 4/20![Frontier logo]()
$194
This Kiwi.com deal was found by Cheapflights users on 4/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
za 5/99:25 pm
ATL
- ONT
1 stop13h 10m
Frontier
wo 5/276:00 am
ONT
- ATL
2 stops35h 11m
Frontier
Deal found 4/18![Frontier logo]()
$183
This Mytrip deal was found by Cheapflights users on 4/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
ma 5/118:45 am
ATL
- ONT
1 stop25h 50m
Frontier
di 5/198:06 pm
ONT
- ATL
1 stop25h 03m
Frontier
Deal found 4/21![Frontier logo]()
$192
This Cheapflightsfares deal was found by Cheapflights users on 4/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
do 5/147:35 am
ATL
- ONT
1 stop29h 30m
Frontier
zo 5/178:06 pm
ONT
- ATL
1 stop25h 03m
Frontier
Deal found 4/17![Frontier logo]()
$184
This Cheapflightsfares deal was found by Cheapflights users on 4/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vr 5/156:03 am
ATL
- ONT
1 stop29h 17m
Frontier
ma 5/188:06 pm
ONT
- ATL
1 stop10h 21m
Frontier
Deal found 4/20![Frontier logo]()
$159
This Booking.com deal was found by Cheapflights users on 4/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
za 5/1611:15 am
ATL
- ONT
1 stop11h 17m
Frontier
vr 5/228:06 pm
ONT
- ATL
1 stop15h 05m
Frontier
Deal found 4/18![Frontier logo]()
$162
This Booking.com deal was found by Cheapflights users on 4/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
di 5/197:11 pm
ATL
- ONT
1 stop23h 33m
Frontier
za 5/238:43 am
ONT
- ATL
1 stop8h 12m
Frontier
Deal found 4/17![Frontier logo]()
$167
This Frontier deal was found by Cheapflights users on 4/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
wo 5/2011:15 am
ATL
- ONT
1 stop7h 29m
Frontier
zo 5/248:03 am
ONT
- ATL
1 stop8h 52m
Frontier
Deal found 4/19![Frontier logo]()
$185
This Trip.com deal was found by Cheapflights users on 4/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
wo 5/2011:15 am
ATL
- ONT
1 stop7h 29m
Frontier
wo 5/274:39 pm
ONT
- ATL
1 stop11h 29m
Frontier
Deal found 4/21![Frontier logo]()
$186
One-way flights from Atlanta to OntarioSearch for one-way flight options from Atlanta to Ontario. Find affordable one-way fares based on user searches. Data last updated april 22, 2026.
Search for one-way flight options from Atlanta to Ontario. Find affordable one-way fares based on user searches. Data last updated april 22, 2026.
This Trip.com deal was found by Cheapflights users on 4/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
di 5/129:25 pm
ATL
- ONT
1 stop13h 10m
Frontier
Deal found 4/17![Frontier logo]()
$82
This Cheapflightsfares deal was found by Cheapflights users on 4/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
ma 5/117:11 pm
ATL
- ONT
1 stop23h 33m
Frontier
Deal found 4/19![Frontier logo]()
$86
This iWofly deal was found by Cheapflights users on 4/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure iWofly is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
za 5/239:25 pm
ATL
- ONT
1 stop12h 43m
Frontier
Deal found 4/22![Frontier logo]()
$87
This Cheapflightsfares deal was found by Cheapflights users on 4/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vr 5/82:32 pm
ATL
- ONT
1 stop7h 39m
Frontier
Deal found 4/21![Frontier logo]()
$100
This eDestinos deal was found by Cheapflights users on 4/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure eDestinos is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
ma 5/49:15 pm
ATL
- ONT
1 stop13h 20m
Frontier
Deal found 4/20![Frontier logo]()
$101
This Super.com deal was found by Cheapflights users on 4/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
wo 5/610:39 am
ATL
- ONT
1 stop11h 32m
Frontier
Deal found 4/21![Frontier logo]()
$105
This CheapOair deal was found by Cheapflights users on 4/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
di 5/59:25 pm
ATL
- ONT
1 stop13h 10m
Frontier
Deal found 4/21![Frontier logo]()
$106
This Booking.com deal was found by Cheapflights users on 4/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
za 5/98:40 pm
ATL
- ONT
1 stop16h 25m
Frontier
Deal found 4/20![Frontier logo]()
$108
Find flight deals from Atlanta to Ontario
Discover tips and strategies to find the most affordable flight options for your journey from Atlanta (ATL) to Ontario (ONT). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated april 22, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $159 (Cheapflightsfares) |
One-way from | $82 (Trip.com) |
Popular in | February |
Cheapest in | October |
Average price | $427 |
Good round-trip deal | $459 or less |
Good one-way deal | $368 or less |
Cheapflights Fare Finder
Customize your flight search to find flights from Atlanta to Ontario that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated april 22, 2026.
Use the filters below to find and compare flights from Atlanta to Ontario that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
AtlantaOntario
ATL - ONT
ATLONT
Atlanta Hartsfield-Jackson
za 5/30
9:22 am-10:57 am
Nonstop4h 35m
Ontario
ma 6/8
10:00 pm-5:15 am
Nonstop4h 15m
$439
AtlantaOntario
ATL - ONT
ATLONT
Atlanta Hartsfield-Jackson
zo 7/5
9:15 am-10:40 am
Nonstop4h 25m
Ontario
do 7/16
11:48 am-7:15 pm
Nonstop4h 27m
$439
Quickest round-trip
AtlantaOntario
ATL - ONT
ATLONT
Atlanta Hartsfield-Jackson
do 7/9
9:21 am-10:38 am
Nonstop4h 17m
Ontario
zo 7/12
10:00 pm-5:18 am
Nonstop4h 18m
$439
AtlantaOntario
ATL - ONT
ATLONT
Atlanta Hartsfield-Jackson
wo 5/27
7:30 pm-11:34 pm
1 stop7h 04m
Ontario
di 7/7
10:00 pm-5:18 am
Nonstop4h 18m
$449
AtlantaOntario
ATL - ONT
ATLONT
Atlanta Hartsfield-Jackson
do 5/28
10:15 am-4:17 pm
1 stop9h 02m
Ontario
di 6/2
12:07 pm-7:24 pm
Nonstop4h 17m
$449
AtlantaOntario
ATL - ONT
ATLONT
Atlanta Hartsfield-Jackson
wo 6/17
6:35 am-12:55 pm
2 stops9h 20m
Ontario
wo 6/24
6:25 pm-5:45 am
2 stops8h 20m
$469
AtlantaOntario
ATL - ONT
ATLONT
Atlanta Hartsfield-Jackson
di 5/12
9:22 am-10:57 am
Nonstop4h 35m
Ontario
di 5/19
10:00 pm-5:14 am
Nonstop4h 14m
$489
AtlantaOntario
ATL - ONT
ATLONT
Atlanta Hartsfield-Jackson
do 5/14
9:22 am-10:57 am
Nonstop4h 35m
Ontario
wo 5/20
10:00 pm-5:14 am
Nonstop4h 14m
$490
AtlantaOntario
ATL - ONT
ATLONT
Atlanta Hartsfield-Jackson
do 7/16
8:19 pm-9:44 pm
Nonstop4h 25m
Ontario
zo 7/19
10:00 pm-5:18 am
Nonstop4h 18m
$509
AtlantaOntario
ATL - ONT
ATLONT
Atlanta Hartsfield-Jackson
ma 6/8
9:15 am-10:40 am
Nonstop4h 25m
Ontario
ma 6/15
10:00 pm-5:15 am
Nonstop4h 15m
$509
Showing 1-10 of 23 resultsSorted by cheapest first
Compare providers for flights from Atlanta to Ontario
Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Atlanta to Ontario in April.
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy1 star | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy- | Trust Score*1 star | |
| Price Accuracy2 stars | Trust Score*2 stars | |
| Price Accuracy1 star | Trust Score*3 stars | |
| Price Accuracy- | Trust Score*1 star | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy2 stars | Trust Score*3 stars |
- Most accurate provider: When it comes to deals on Atlanta-Ontario flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Atlanta-Ontario flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Atlanta-Ontario flight searches over the past month and is updated monthly.
- Most trusted provider: When it comes to deals on Atlanta-Ontario flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Atlanta-Ontario flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.
Best time to book a flight from Atlanta to Ontario
Have a flexible travel schedule? Discover the best time to fly to Ontario from Atlanta with our price prediction graph.
ATL-ONT
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.
Cheapflights Insights
Everything you need to know about your flight from Atlanta to Ontario
Prices
Airlines
Delays
More
How far ahead should I book a flight from Atlanta to Ontario?
Use this chart to determine the optimal time to book a round-trip flight from Atlanta to Ontario. Price data was last updated on April 17, 2026.
To ensure you get the cheapest price possible for a flight from Atlanta to Ontario, you should look to book at least 48 days in advance of your intended travel date. The price of your flight may increase if you delay and leave booking until a week or so before departure.
What is the cheapest month to book a flight from Atlanta to Ontario?
Currently, October is the cheapest month in which you can book a flight from Atlanta to Ontario (average of $232). Flying from Atlanta to Ontario in February is currently the most expensive (average of $489). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.
What is the cheapest time of day to fly from ATL to ONT?
Find hourly flight availability from Atlanta to Ontario. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated april 22, 2026.
When flying from Atlanta to Ontario, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.
How often are flights from Atlanta to Ontario delayed?
About 20% of weekly flights between Atlanta and Ontario have experienced delays in the past year, with the average delay time being 127 minutes.
What is the most punctual flight time for Atlanta to Ontario flights?
Historically, flights departing in the morning are less likely to be delayed, whereas flights leaving at night tend to experience delays more often.
What day of the week experiences the fewest flight delays on this route?
Thursday tends to have the lowest number of delays on this route, whereas Monday has historically faced a higher average of delays compared to other days of the week.
Which airline has the best punctuality record on Atlanta to Ontario flights?
Over the last year, Delta have had the lowest number of delays on this route, with just 20% of flights being delayed.
What’s the top layover airport for flights from Atlanta to Ontario?
Share of 1-stop round-trip flights from Atlanta to Ontario chosen by Cheapflights users in the past 12 months, using the same layover each way.
Las Vegas (LAS) – chosen by Cheapflights users on 60% of 1-stop itineraries from Atlanta to Ontario on Cheapflights.
What’s the cheapest layover airport for flights from Atlanta to Ontario?
Average round-trip fare for 1-stop flights from Atlanta to Ontario, chosen by Cheapflights users in the past 12 months, with the same layover each way.
Dallas (DFW) is the most affordable 1-stop option, with an average round-trip price of $153.
What’s the fastest layover option from Atlanta to Ontario?
Shortest average travel time for 1-stop one-way flights from Atlanta to Ontario, based on itineraries clicked by Cheapflights users over the past 12 months, grouped by layover airport.
Flights via Austin (AUS) have the shortest average one-way travel time for 1-stop routes: 6h 20m.
Which airport typically offers the quickest layover for flights from Atlanta to Ontario?
Average layover duration for 1-stop one-way flights from Atlanta to Ontario, chosen by Cheapflights users in the last 12 months, grouped by stopover airport.
Flights via Austin (AUS) offer the fastest connection on this route, with an average layover time of 1h 35m.
Reviews of airlines servicing Ontario
Get insights into the airlines that provide service to Ontario. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Ontario. Reviews last updated april 22, 2026.
Get a feel of what it's like to fly with Southwest,Delta, andUnited Airlines from Atlanta to Ontario by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Crew
8.6
Comfort
8.0
Entertainment
7.5
Boarding
8.1
Food
7.0
Overall
8.0
Reviews
1 / 20
2.0
MediocreDominic,Mar 2026
MCO - SMF
Crew
8.6
Comfort
8.0
Entertainment
7.5
Boarding
8.1
Food
7.0
Overall
8.0
Reviews
1 / 20
2.0
MediocreDominic,Mar 2026
MCO - SMF
Crew
8.6
Comfort
8.0
Entertainment
7.5
Boarding
8.1
Food
7.0
Overall
8.0
Reviews
1 / 20
2.0
MediocreDominic,Mar 2026
MCO - SMF
Crew
8.6
Comfort
8.0
Entertainment
7.5
Boarding
8.1
Food
7.0
Overall
8.0
Reviews
1 / 20
2.0
MediocreDominic,Mar 2026
MCO - SMF
Crew
8.6
Comfort
8.0
Entertainment
7.5
Boarding
8.1
Food
7.0
Overall
8.0
Reviews
1 / 20
2.0
MediocreDominic,Mar 2026
MCO - SMF
Crew
8.6
Comfort
8.0
Entertainment
7.5
Boarding
8.1
Food
7.0
Overall
8.0
Reviews
1 / 20
2.0
MediocreDominic,Mar 2026
MCO - SMF
Related info for your journey
Find useful and relevant information for your journey from Atlanta to Ontario. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
Browse thousands of different options on Cheapflights for your next trip
Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.
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Alternative routes for Atlanta to Ontario
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Complete your trip
Complete your trip to Ontario by adding a car rental and/or hotel reservation to your travel itinerary.
Search flights from Atlanta to Ontario by cabin class
Find flights from Atlanta to Ontario, based on your preferred cabin class, be it economy, premium economy, business, or first class.
Other flights to Ontario
Explore flights to Ontario departing from other origins. Flights are based on user searches made on Cheapflights and were last updated on april 22, 2026.
Atlanta and Ontario flights
Browse other Atlanta and Ontario flight options. Last updated on april 22, 2026.
Other flights from Atlanta
Browse through other flights departing from Atlanta. Flights are based on user searches made on Cheapflights and were last updated on april 22, 2026.
Popular flight searches
Check out other popular destinations found by fellow travelers in 2026
Top 5 airlines flying from Atlanta to Ontario
Discover the top 5 airlines that operate flights from Atlanta to Ontario. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated april 22, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$142 | Average$213 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$295 | Average$446 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$302 | Average$510 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$311 | Average$416 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$338 | Average$428 | FlexibilityNo cancel fee | On-time69% |