$185+ Cheap flights from Greenville to Ontario (GSP - 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 11/12. Fares are subject to change and may not be available on all flights or dates of travel.
GSP — ONT
Nov 19 — Nov 261
Round-trip
1 adult, Economy
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Find cheap flights from Greenville 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.Cheap flight deals from Greenville to Ontario
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Cheapest flights from Greenville to OntarioExplore the most affordable flight options available from Greenville to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on October 20, 2026.
Explore the most affordable flight options available from Greenville to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on October 20, 2026.
This American Airlines deal was found by Cheapflights users on 10/14. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/187:51 am -
1 stop8h 41m
Sat 11/2112:45 pm -
1 stop6h 18m
Deal found 10/14![American Airlines logo]()
$399
This United Airlines deal was found by Cheapflights users on 10/16. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/184:29 pm -
1 stop7h 22m
Sun 11/226:00 am -
1 stop7h 10m
Deal found 10/16![United Airlines logo]()
$439
This American Airlines deal was found by Cheapflights users on 10/15. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/77:44 pm -
1 stop7h 04m
Wed 12/167:00 am -
1 stop6h 23m
Deal found 10/15![American Airlines logo]()
$448
This American Airlines deal was found by Cheapflights users on 10/16. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/125:17 pm -
1 stop9h 29m
Wed 11/1810:30 pm -
1 stop6h 44m
Deal found 10/16![American Airlines logo]()
$449
This Southwest deal was found by Cheapflights users on 10/15. 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.
Sat 11/710:50 am -
1 stop7h 10m
Wed 11/117:50 am -
2 stops10h 00m
Deal found 10/15![Southwest logo]()
$454
This American Airlines deal was found by Cheapflights users on 10/19. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/55:16 pm -
1 stop7h 51m
Sat 12/1210:30 pm -
1 stop6h 44m
Deal found 10/19![American Airlines logo]()
$498
This Southwest deal was found by Cheapflights users on 10/15. 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.
Fri 11/1310:45 am -
1 stop8h 00m
Fri 11/2011:15 am -
2 stops8h 45m
Deal found 10/15![Southwest logo]()
$501
This United Airlines deal was found by Cheapflights users on 10/14. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/105:12 pm -
1 stop7h 28m
Wed 11/114:17 pm -
2 stops14h 13m
Deal found 10/14![United Airlines logo]()
$504
Best flights from Greenville to OntarioDiscover carefully curated flight deals from Greenville to Ontario that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated October 20, 2026.
Discover carefully curated flight deals from Greenville to Ontario that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated October 20, 2026.
This Delta deal was found by Cheapflights users on 10/14. 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.
Fri 1/16:05 am -
1 stop6h 55m
Fri 1/2212:00 pm -
1 stop6h 21m
Deal found 10/14![Delta logo]()
$369
This American Airlines deal was found by Cheapflights users on 10/16. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/187:51 am -
1 stop8h 41m
Sat 11/2112:45 pm -
1 stop6h 18m
Deal found 10/16![American Airlines logo]()
$439
This United Airlines deal was found by Cheapflights users on 10/16. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/186:20 am -
2 stops9h 13m
Sun 11/226:37 pm -
2 stops11h 53m
Deal found 10/16![United Airlines logo]()
$449
This Southwest deal was found by Cheapflights users on 10/15. 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.
Sat 11/77:05 am -
2 stops8h 45m
Wed 11/117:50 am -
2 stops10h 00m
Deal found 10/15![Southwest logo]()
$459
This Delta deal was found by Cheapflights users on 10/15. 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 2/105:05 pm -
1 stop8h 09m
Tue 2/237:00 am -
1 stop8h 54m
Deal found 10/15![Delta logo]()
$449
This Southwest deal was found by Cheapflights users on 10/15. 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.
Wed 2/1011:10 am -
2 stops9h 45m
Tue 2/2310:05 am -
2 stops7h 55m
Deal found 10/15![Southwest logo]()
$459
This American Airlines deal was found by Cheapflights users on 10/16. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 1/16:02 pm -
1 stop7h 52m
Fri 1/812:45 pm -
1 stop6h 25m
Deal found 10/16![American Airlines logo]()
$494
This Delta deal was found by Cheapflights users on 10/16. 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 2/25:40 am -
1 stop8h 47m
Sun 2/77:00 am -
1 stop6h 09m
Deal found 10/16![Delta logo]()
$461
This Southwest deal was found by Cheapflights users on 10/15. 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.
Fri 11/1310:45 am -
1 stop8h 00m
Fri 11/2011:15 am -
2 stops8h 45m
Deal found 10/15![Southwest logo]()
$501
This American Airlines deal was found by Cheapflights users on 10/18. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/122:26 pm -
2 stops10h 43m
Wed 11/186:00 am -
1 stop7h 27m
Deal found 10/18![American Airlines logo]()
$537
This Southwest deal was found by Cheapflights users on 10/14. 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.
Wed 11/187:05 am -
2 stops10h 35m
Sat 11/218:05 pm -
2 stops13h 20m
Deal found 10/14![Southwest logo]()
$544
Last-minute flights from Greenville to OntarioDiscover last-minute flight deals from Greenville to Ontario. Data last updated October 20, 2026 and is based on user searches.
Discover last-minute flight deals from Greenville to Ontario. Data last updated October 20, 2026 and is based on user searches.
This Southwest deal was found by Cheapflights users on 10/15. 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.
Sat 11/710:50 am -
1 stop7h 10m
Wed 11/117:50 am -
2 stops10h 00m
Deal found 10/15![Southwest logo]()
$454
This United Airlines deal was found by Cheapflights users on 10/14. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/105:12 pm -
1 stop7h 28m
Wed 11/114:17 pm -
2 stops14h 13m
Deal found 10/14![United Airlines logo]()
$504
This American Airlines deal was found by Cheapflights users on 10/16. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/125:17 pm -
1 stop9h 29m
Wed 11/1810:30 pm -
1 stop6h 44m
Deal found 10/16![American Airlines logo]()
$449
This Southwest deal was found by Cheapflights users on 10/15. 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.
Fri 11/1310:45 am -
1 stop8h 00m
Fri 11/2011:15 am -
2 stops8h 45m
Deal found 10/15![Southwest logo]()
$501
This American Airlines deal was found by Cheapflights users on 10/14. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/187:51 am -
1 stop8h 41m
Sat 11/2112:45 pm -
1 stop6h 18m
Deal found 10/14![American Airlines logo]()
$399
This United Airlines deal was found by Cheapflights users on 10/16. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/184:29 pm -
1 stop7h 22m
Sun 11/226:00 am -
1 stop7h 10m
Deal found 10/16![United Airlines logo]()
$439
One-way flights from Greenville to OntarioSearch for one-way flight options from Greenville to Ontario. Find affordable one-way fares based on user searches. Data last updated October 20, 2026.
Search for one-way flight options from Greenville to Ontario. Find affordable one-way fares based on user searches. Data last updated October 20, 2026.
This American Airlines deal was found by Cheapflights users on 10/14. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/123:58 pm -
1 stop10h 03m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/14![American Airlines logo]()
$185
This American Airlines deal was found by Cheapflights users on 10/16. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/235:17 pm -
1 stop9h 42m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/16![American Airlines logo]()
$215
This Kiwi.com deal was found by Cheapflights users on 10/16. 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.
Mon 11/238:32 pm -
2 stops36h 48m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/16![Multiple Airlines logo]()
$239
This American Airlines deal was found by Cheapflights users on 10/16. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 2/265:20 pm -
1 stop8h 05m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/16![American Airlines logo]()
$250
This United Airlines deal was found by Cheapflights users on 10/14. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/126:20 am -
2 stops12h 13m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/14![United Airlines logo]()
$255
This United Airlines deal was found by Cheapflights users on 10/15. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/71:56 pm -
1 stop7h 51m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/15![United Airlines logo]()
$290
This Kiwi.com deal was found by Cheapflights users on 10/16. 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.
Mon 11/308:52 pm -
3 stops29h 06m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/16![Multiple Airlines logo]()
$296
Find flight deals from Greenville to Ontario
Discover tips and strategies to find the most affordable flight options for your journey from Greenville (GSP) 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 October 20, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $369 (Delta) |
One-way from | $185 (American Airlines) |
Popular in | April |
Cheapest in | January |
Average price | $504 |
Cheapflights Fare Finder
Customize your flight search to find flights from Greenville 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 October 20, 2026.
Use the filters below to find and compare flights from Greenville to Ontario that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
GreenvilleOntario
GSP Greenville - ONT Ontario
GSPONT
Greenville
Thu 11/12
3:58 pm-11:01 pm
1 stop10h 03m
Ontario
Wed 12/31
12:00 am-3:00 am
Nonstop0h 00m
$185
GreenvilleOntario
GSP Greenville - ONT Ontario
GSPONT
Greenville
Sat 11/14
5:40 am-11:03 am
1 stop8h 23m
Ontario
Wed 12/31
12:00 am-3:00 am
Nonstop0h 00m
$284
GreenvilleOntario
GSP Greenville - ONT Ontario
GSPONT
Greenville
Sat 11/7
1:56 pm-6:47 pm
1 stop7h 51m
Ontario
Wed 12/31
12:00 am-3:00 am
Nonstop0h 00m
$290
GreenvilleOntario
GSP Greenville - ONT Ontario
GSPONT
Greenville
Thu 11/12
6:20 am-5:56 pm
2 stops14h 36m
Ontario
Wed 12/31
12:00 am-3:00 am
Nonstop0h 00m
$295
Quickest round-trip
GreenvilleOntario
GSP Greenville - ONT Ontario
GSPONT
Greenville
Wed 4/14
5:41 pm-10:31 pm
1 stop7h 50m
Ontario
Wed 12/31
12:00 am-3:00 am
Nonstop0h 00m
$314
GreenvilleOntario
GSP Greenville - ONT Ontario
GSPONT
Greenville
Tue 2/9
6:30 am-12:40 pm
2 stops9h 10m
Ontario
Wed 12/31
12:00 am-3:00 am
Nonstop0h 00m
$319
GreenvilleOntario
GSP Greenville - ONT Ontario
GSPONT
Greenville
Tue 11/10
6:20 am-12:33 pm
2 stops9h 13m
Ontario
Wed 12/31
12:00 am-3:00 am
Nonstop0h 00m
$340
GreenvilleOntario
GSP Greenville - ONT Ontario
GSPONT
Greenville
Fri 1/1
6:05 am-10:00 am
1 stop6h 55m
Ontario
Fri 1/22
12:00 pm-9:21 pm
1 stop6h 21m
$369
GreenvilleOntario
GSP Greenville - ONT Ontario
GSPONT
Greenville
Wed 11/18
7:51 am-1:32 pm
1 stop8h 41m
Ontario
Sat 11/21
12:45 pm-10:03 pm
1 stop6h 18m
$439
GreenvilleOntario
GSP Greenville - ONT Ontario
GSPONT
Greenville
Wed 11/18
6:20 am-12:33 pm
2 stops9h 13m
Ontario
Sun 11/22
6:37 pm-9:30 am
2 stops11h 53m
$449
Showing 1-10 of 18 resultsSorted by cheapest first
Compare providers for flights from Greenville 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 Greenville to Ontario in October.
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy1 star | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars |
- Most accurate provider: When it comes to deals on Greenville-Ontario flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Greenville-Ontario flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Greenville-Ontario flight searches over the past month and is updated monthly.
- Most trusted provider: When it comes to deals on Greenville-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 Greenville-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 Greenville to Ontario
Have a flexible travel schedule? Discover the best time to fly to Ontario from Greenville with our price prediction graph.
GSP-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 Greenville to Ontario
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 October 20, 2026.
Peruse reviews from past customers who have flown with Delta and American Airlines from Greenville to Ontario to help guide your decision. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Entertainment
7.8
Comfort
7.8
Food
7.2
Overall
7.8
Boarding
8.1
Crew
8.5
Reviews
1 / 20
8.0
ExcellentMatthew,Oct 2025
GSP - ATL
Entertainment
7.8
Comfort
7.8
Food
7.2
Overall
7.8
Boarding
8.1
Crew
8.5
Reviews
1 / 20
8.0
ExcellentMatthew,Oct 2025
GSP - ATL
Entertainment
7.8
Comfort
7.8
Food
7.2
Overall
7.8
Boarding
8.1
Crew
8.5
Reviews
1 / 20
8.0
ExcellentMatthew,Oct 2025
GSP - ATL
Related info for your journey
Find useful and relevant information for your journey from Greenville 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 Greenville 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.
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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 October 20, 2026.
Greenville and Ontario flights
Browse other Greenville and Ontario flight options. Last updated on October 20, 2026.
Other flights from Greenville
Browse through other flights departing from Greenville. Flights are based on user searches made on Cheapflights and were last updated on October 20, 2026.
Popular flight searches
Check out other popular destinations found by fellow travelers in 2026
Top 2 airlines flying from Greenville to Ontario
Discover the top 2 airlines that operate flights from Greenville 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 October 20, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$351 | Average$429 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$368 | Average$494 | FlexibilityNo cancel fee | On-time71% |