$52+ Cheap flights from Atlanta to Ontario (ATL - ONT)
This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 11/7. Fares are subject to change and may not be available on all flights or dates of travel.
ATL — ONT
Oct 29 — Nov 51
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 January, booked 19 days in advance, depart on a Tuesday or Wednesday and return on a Friday
Cheap flight deals from Atlanta to Ontario
Cheapest
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 September 29, 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 September 29, 2026.
This Frontier deal was found by Cheapflights users on 9/27. 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.
Sat 10/246:45 am -
1 stop6h 44m
Wed 10/286:25 am -
1 stop6h 20m
Deal found 9/27![Frontier logo]()
$255
This Kiwi.com deal was found by Cheapflights users on 9/25. 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.
Tue 10/276:55 am -
1 stop6h 40m
Thu 11/511:52 am -
1 stop9h 02m
Deal found 9/25![Frontier logo]()
$256
This Kiwi.com deal was found by Cheapflights users on 9/25. 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.
Sat 10/176:45 am -
1 stop20h 05m
Wed 10/216:15 am -
2 stops12h 19m
Deal found 9/25![Frontier logo]()
$257
This Cheapflightsfares deal was found by Cheapflights users on 9/29. 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.
Wed 10/216:45 am -
1 stop20h 05m
Mon 10/268:35 pm -
1 stop17h 56m
Deal found 9/29![Frontier logo]()
$258
This Booking.com deal was found by Cheapflights users on 9/24. 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.
Tue 10/279:05 pm -
2 stops15h 35m
Wed 10/2811:52 am -
1 stop8h 36m
Deal found 9/24![Frontier logo]()
$259
This Frontier deal was found by Cheapflights users on 9/29. 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.
Sat 11/146:55 am -
1 stop6h 47m
Tue 11/1710:35 am -
2 stops9h 57m
Deal found 9/29![Frontier logo]()
$260
This Frontier deal was found by Cheapflights users on 9/28. 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.
Tue 10/275:22 am -
2 stops21h 29m
Wed 11/46:25 am -
2 stops12h 04m
Deal found 9/28![Frontier logo]()
$261
This Mytrip deal was found by Cheapflights users on 9/28. 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.
Fri 11/69:05 pm -
2 stops16h 37m
Mon 11/96:25 am -
2 stops15h 03m
Deal found 9/28![Frontier logo]()
$262
This Kiwi.com deal was found by Cheapflights users on 9/25. 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.
Tue 10/276:55 am -
1 stop6h 40m
Fri 11/611:52 am -
1 stop9h 02m
Deal found 9/25![Frontier logo]()
$263
This Cheapflightsfares deal was found by Cheapflights users on 9/29. 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.
Tue 10/206:45 am -
1 stop6h 44m
Fri 10/308:35 pm -
1 stop14h 47m
Deal found 9/29![Frontier logo]()
$264
This Mytrip deal was found by Cheapflights users on 9/28. 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.
Thu 11/199:35 am -
2 stops13h 48m
Mon 11/237:15 am -
1 stop14h 06m
Deal found 9/28![Frontier logo]()
$265
This Mytrip deal was found by Cheapflights users on 9/28. 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.
Sat 10/247:58 pm -
1 stop6h 52m
Mon 10/268:35 pm -
2 stops16h 09m
Deal found 9/28![Frontier logo]()
$266
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 September 29, 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 September 29, 2026.
This Southwest deal was found by Cheapflights users on 9/29. 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.
Thu 12/179:40 am -
2 stops8h 45m
Sun 12/206:45 am -
2 stops7h 35m
Deal found 9/29![Southwest logo]()
$483
This Delta deal was found by Cheapflights users on 9/24. 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.
Sat 10/245:59 pm -
Nonstop4h 31m
Sat 10/317:07 am -
Nonstop4h 07m
Deal found 9/24![Delta logo]()
$487
This KAYAK deal was found by Cheapflights users on 9/24. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/277:03 am -
1 stop9h 13m
Fri 10/306:56 pm -
1 stop9h 34m
Deal found 9/24![Alaska Airlines logo]()
$494
This Delta deal was found by Cheapflights users on 9/24. 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.
Thu 12/39:18 am -
Nonstop4h 49m
Sun 12/611:08 pm -
Nonstop4h 03m
Deal found 9/24![Delta logo]()
$489
This Delta deal was found by Cheapflights users on 9/25. 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.
Sat 12/126:10 pm -
Nonstop4h 45m
Sun 12/1311:08 pm -
Nonstop4h 03m
Deal found 9/25![Delta logo]()
$489
This Delta deal was found by Cheapflights users on 9/25. 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.
Sat 10/315:59 pm -
Nonstop4h 31m
Sat 11/712:16 pm -
Nonstop4h 11m
Deal found 9/25![Delta logo]()
$491
This Delta deal was found by Cheapflights users on 9/28. 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.
Sat 11/1411:45 am -
1 stop7h 39m
Tue 11/1712:18 pm -
Nonstop4h 06m
Deal found 9/28![Delta logo]()
$499
This Delta deal was found by Cheapflights users on 9/29. 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.
Wed 12/92:11 pm -
1 stop11h 48m
Sat 12/1212:20 pm -
Nonstop4h 09m
Deal found 9/29![Delta logo]()
$499
This Delta deal was found by Cheapflights users on 9/25. 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.
Wed 10/219:30 am -
Nonstop4h 36m
Tue 11/107:05 am -
Nonstop4h 00m
Deal found 9/25![Delta logo]()
$539
This Delta deal was found by Cheapflights users on 9/27. 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.
Tue 10/209:30 am -
Nonstop4h 36m
Fri 10/306:00 pm -
1 stop10h 32m
Deal found 9/27![Delta logo]()
$549
This Delta deal was found by Cheapflights users on 9/27. 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.
Wed 11/257:50 pm -
1 stop6h 59m
Mon 11/3011:10 pm -
Nonstop3h 57m
Deal found 9/27![Delta logo]()
$594
This Delta deal was found by Cheapflights users on 9/29. 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.
Wed 10/219:30 am -
Nonstop4h 36m
Mon 10/2611:15 pm -
Nonstop4h 07m
Deal found 9/29![Delta logo]()
$599
Last-minute flights from Atlanta to OntarioDiscover last-minute flight deals from Atlanta to Ontario. Data last updated September 29, 2026 and is based on user searches.
Discover last-minute flight deals from Atlanta to Ontario. Data last updated September 29, 2026 and is based on user searches.
This Kiwi.com deal was found by Cheapflights users on 9/25. 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.
Sat 10/176:45 am -
1 stop20h 05m
Wed 10/216:15 am -
2 stops12h 19m
Deal found 9/25![Frontier logo]()
$257
This Booking.com deal was found by Cheapflights users on 9/26. 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.
Mon 10/199:24 pm -
1 stop22h 06m
Wed 10/216:15 am -
1 stop6h 34m
Deal found 9/26![Frontier logo]()
$267
This Booking.com deal was found by Cheapflights users on 9/29. 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.
Tue 10/207:58 pm -
1 stop6h 52m
Sat 10/2411:52 am -
1 stop9h 07m
Deal found 9/29![Frontier logo]()
$262
This Cheapflightsfares deal was found by Cheapflights users on 9/29. 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.
Tue 10/206:45 am -
1 stop6h 44m
Fri 10/308:35 pm -
1 stop14h 47m
Deal found 9/29![Frontier logo]()
$264
This Cheapflightsfares deal was found by Cheapflights users on 9/29. 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.
Wed 10/216:45 am -
1 stop20h 05m
Mon 10/268:35 pm -
1 stop17h 56m
Deal found 9/29![Frontier logo]()
$258
This FlightHub deal was found by Cheapflights users on 9/25. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/217:58 pm -
1 stop6h 52m
Mon 11/96:25 am -
1 stop6h 18m
Deal found 9/25![Frontier logo]()
$265
This Frontier deal was found by Cheapflights users on 9/27. 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.
Sat 10/247:58 pm -
1 stop6h 52m
Sat 10/3111:52 am -
1 stop9h 02m
Deal found 9/27![Frontier logo]()
$255
This Mytrip deal was found by Cheapflights users on 9/28. 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.
Sat 10/247:58 pm -
1 stop6h 52m
Mon 10/268:35 pm -
2 stops16h 09m
Deal found 9/28![Frontier logo]()
$266
This Kiwi.com deal was found by Cheapflights users on 9/25. 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.
Tue 10/276:55 am -
1 stop6h 40m
Thu 11/511:52 am -
1 stop9h 02m
Deal found 9/25![Frontier logo]()
$256
This Booking.com deal was found by Cheapflights users on 9/24. 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.
Tue 10/279:05 pm -
2 stops15h 35m
Wed 10/2811:52 am -
1 stop8h 36m
Deal found 9/24![Frontier logo]()
$259
This Frontier deal was found by Cheapflights users on 9/28. 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.
Tue 10/275:22 am -
2 stops21h 29m
Wed 11/46:25 am -
2 stops12h 04m
Deal found 9/28![Frontier logo]()
$261
This Kiwi.com deal was found by Cheapflights users on 9/25. 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.
Tue 10/276:55 am -
1 stop6h 40m
Fri 11/611:52 am -
1 stop9h 02m
Deal found 9/25![Frontier logo]()
$263
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 September 29, 2026.
Search for one-way flight options from Atlanta to Ontario. Find affordable one-way fares based on user searches. Data last updated September 29, 2026.
This Super.com deal was found by Cheapflights users on 9/29. 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.
Sat 11/76:55 am -
1 stop6h 47m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/29![Frontier logo]()
$52
This Booking.com deal was found by Cheapflights users on 9/29. 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.
Sat 10/316:55 am -
1 stop6h 47m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/29![Frontier logo]()
$53
This Super.com deal was found by Cheapflights users on 9/28. 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.
Tue 10/276:55 am -
1 stop6h 40m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/28![Frontier logo]()
$80
This Mytrip deal was found by Cheapflights users on 9/29. 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.
Tue 11/36:21 pm -
2 stops19h 14m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/29![Frontier logo]()
$81
This Cheapflightsfares deal was found by Cheapflights users on 9/29. 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.
Wed 12/96:19 pm -
1 stop6h 58m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/29![Frontier logo]()
$82
This Cheapflightsfares deal was found by Cheapflights users on 9/29. 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.
Wed 11/47:58 pm -
1 stop6h 53m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/29![Frontier logo]()
$83
This CheapOair deal was found by Cheapflights users on 9/29. 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.
Tue 10/209:24 pm -
1 stop22h 06m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/29![Frontier logo]()
$85
This Super.com deal was found by Cheapflights users on 9/25. 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.
Wed 10/286:55 am -
1 stop19h 56m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/25![Frontier logo]()
$86
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 September 29, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $255 (Frontier) |
One-way from | $53 (Booking.com) |
Popular in | September |
Cheapest in | October |
Average price | $538 |
Good round-trip deal | $489 or less |
Good one-way deal | $583 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 7,457,451 searches. Data last updated September 29, 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 Atlanta Hartsfield-Jackson - ONT Ontario
ATLONT
Atlanta Hartsfield-Jackson
Thu 10/29
4:35 pm-11:42 pm
1 stop10h 07m
Ontario
Wed 12/31
12:00 am-3:00 am
Nonstop0h 00m
$189
AtlantaOntario
ATL Atlanta Hartsfield-Jackson - ONT Ontario
ATLONT
Atlanta Hartsfield-Jackson
Tue 10/27
7:03 am-1:16 pm
1 stop9h 13m
Ontario
Wed 12/31
12:00 am-3:00 am
Nonstop0h 00m
$239
AtlantaOntario
ATL Atlanta Hartsfield-Jackson - ONT Ontario
ATLONT
Atlanta Hartsfield-Jackson
Wed 11/25
9:20 am-11:03 am
Nonstop4h 43m
Ontario
Wed 12/31
12:00 am-3:00 am
Nonstop0h 00m
$399
AtlantaOntario
ATL Atlanta Hartsfield-Jackson - ONT Ontario
ATLONT
Atlanta Hartsfield-Jackson
Mon 12/28
8:10 am-10:00 am
Nonstop4h 50m
Ontario
Wed 12/31
12:00 am-3:00 am
Nonstop0h 00m
$399
AtlantaOntario
ATL Atlanta Hartsfield-Jackson - ONT Ontario
ATLONT
Atlanta Hartsfield-Jackson
Tue 10/27
7:00 am-8:15 pm
3 stops16h 15m
Ontario
Wed 12/31
12:00 am-3:00 am
Nonstop0h 00m
$413
AtlantaOntario
ATL Atlanta Hartsfield-Jackson - ONT Ontario
ATLONT
Atlanta Hartsfield-Jackson
Fri 10/2
4:19 pm-11:24 pm
1 stop10h 05m
Ontario
Wed 12/31
12:00 am-3:00 am
Nonstop0h 00m
$415
AtlantaOntario
ATL Atlanta Hartsfield-Jackson - ONT Ontario
ATLONT
Atlanta Hartsfield-Jackson
Thu 12/10
8:10 pm-9:55 pm
Nonstop4h 45m
Ontario
Wed 12/31
12:00 am-3:00 am
Nonstop0h 00m
$424
AtlantaOntario
ATL Atlanta Hartsfield-Jackson - ONT Ontario
ATLONT
Atlanta Hartsfield-Jackson
Tue 11/24
9:20 am-11:03 am
Nonstop4h 43m
Ontario
Wed 12/31
12:00 am-3:00 am
Nonstop0h 00m
$424
Quickest round-trip
AtlantaOntario
ATL Atlanta Hartsfield-Jackson - ONT Ontario
ATLONT
Atlanta Hartsfield-Jackson
Tue 10/27
9:30 am-11:06 am
Nonstop4h 36m
Ontario
Wed 12/31
12:00 am-3:00 am
Nonstop0h 00m
$424
AtlantaOntario
ATL Atlanta Hartsfield-Jackson - ONT Ontario
ATLONT
Atlanta Hartsfield-Jackson
Tue 12/1
9:18 am-11:07 am
Nonstop4h 49m
Ontario
Wed 12/31
12:00 am-3:00 am
Nonstop0h 00m
$424
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 September.
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy1 star | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy- | Trust Score*1 star | |
| Price Accuracy- | Trust Score*1 star | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy2 stars | Trust Score*3 stars | |
| Price Accuracy2 stars | Trust Score*1 star | |
| 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
Delays
More
How far ahead should I book a flight from Atlanta to Ontario?
To ensure you get the cheapest price possible for a flight from Atlanta to Ontario, you should look to book at least 18 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 $275). Flying from Atlanta to Ontario in September is currently the most expensive (average of $538). 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 September 29, 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 21% of weekly flights between Atlanta and Ontario have experienced delays in the past year, with the average delay time being 128 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?
Wednesday tends to have the lowest number of delays on this route, whereas Sunday 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 21% 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.
Denver (DEN) – chosen by Cheapflights users on 65% 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 $246.
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 Phoenix (PHX) have the shortest average one-way travel time for 1-stop routes: 6h 25m.
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 Phoenix (PHX) offer the fastest connection on this route, with an average layover time of 1h 38m.
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 September 29, 2026.
Get a feel of what it's like to fly with Southwest,Delta, andJetBlue 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.
Boarding
8.1
Food
7.0
Overall
8.0
Entertainment
7.5
Crew
8.6
Comfort
8.0
Reviews
1 / 20
10.0
ExcellentWalter,May 2026
LAS - BUR
Boarding
8.1
Food
7.0
Overall
8.0
Entertainment
7.5
Crew
8.6
Comfort
8.0
Reviews
1 / 20
10.0
ExcellentWalter,May 2026
LAS - BUR
Boarding
8.1
Food
7.0
Overall
8.0
Entertainment
7.5
Crew
8.6
Comfort
8.0
Reviews
1 / 20
10.0
ExcellentWalter,May 2026
LAS - BUR
Boarding
8.1
Food
7.0
Overall
8.0
Entertainment
7.5
Crew
8.6
Comfort
8.0
Reviews
1 / 20
10.0
ExcellentWalter,May 2026
LAS - BUR
Boarding
8.1
Food
7.0
Overall
8.0
Entertainment
7.5
Crew
8.6
Comfort
8.0
Reviews
1 / 20
10.0
ExcellentWalter,May 2026
LAS - BUR
Boarding
8.1
Food
7.0
Overall
8.0
Entertainment
7.5
Crew
8.6
Comfort
8.0
Reviews
1 / 20
10.0
ExcellentWalter,May 2026
LAS - BUR
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.
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Alternative routes for Atlanta to Ontario
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Complete your trip
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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 September 29, 2026.
Atlanta and Ontario flights
Browse other Atlanta and Ontario flight options. Last updated on September 29, 2026.
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Top 6 airlines flying from Atlanta to Ontario
Discover the top 6 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 7,457,451 searches. Data last updated September 29, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$153 | Average$255 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$287 | Average$468 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$295 | Average$461 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$307 | Average$415 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$375 | Average$428 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$376 | Average$548 | FlexibilityNo cancel fee | On-timeN/A |