$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 10/3. Fares are subject to change and may not be available on all flights or dates of travel.
GSP — ONT
Oct 11 — Oct 181
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 September 11, 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 September 11, 2026.
This Delta deal was found by Cheapflights users on 9/9. 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 12/97:00 am -
1 stop7h 08m
Mon 12/1412:20 pm -
1 stop7h 02m
Deal found 9/9![Delta logo]()
$369
This American Airlines deal was found by Cheapflights users on 9/10. 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 10/35:24 pm -
1 stop8h 13m
Tue 10/1310:10 pm -
1 stop7h 14m
Deal found 9/10![American Airlines logo]()
$406
This American Airlines deal was found by Cheapflights users on 9/10. 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.
Tue 11/177:51 am -
1 stop8h 40m
Thu 11/1912:45 pm -
1 stop6h 18m
Deal found 9/10![American Airlines logo]()
$423
This United Airlines deal was found by Cheapflights users on 9/10. 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 11/1711:58 am -
2 stops12h 42m
Thu 11/195:00 am -
1 stop7h 03m
Deal found 9/10![United Airlines logo]()
$428
This Southwest deal was found by Cheapflights users on 9/10. 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.
Tue 11/177:05 am -
2 stops10h 35m
Thu 11/195:55 am -
2 stops9h 15m
Deal found 9/10![Southwest logo]()
$433
This United Airlines deal was found by Cheapflights users on 9/9. 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 11/104:29 pm -
1 stop7h 22m
Wed 11/115:00 am -
1 stop7h 03m
Deal found 9/9![United Airlines logo]()
$479
This Delta deal was found by Cheapflights users on 9/7. 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 11/197:05 am -
1 stop7h 03m
Mon 11/237:05 am -
1 stop8h 09m
Deal found 9/7![Delta logo]()
$491
This American Airlines deal was found by Cheapflights users on 9/8. 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.
Tue 10/68:00 am -
1 stop8h 30m
Tue 10/610:10 pm -
1 stop7h 14m
Deal found 9/8![American Airlines logo]()
$495
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 September 11, 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 September 11, 2026.
This Delta deal was found by Cheapflights users on 9/9. 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 10/287:00 am -
1 stop7h 06m
Wed 11/1112:18 pm -
1 stop6h 54m
Deal found 9/9![Delta logo]()
$369
This United Airlines deal was found by Cheapflights users on 9/9. 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 11/104:29 pm -
1 stop7h 22m
Wed 11/115:00 am -
1 stop7h 03m
Deal found 9/9![United Airlines logo]()
$479
This Alaska Airlines deal was found by Cheapflights users on 9/6. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/66:01 am -
2 stops14h 59m
Tue 10/276:02 am -
2 stops13h 58m
Deal found 9/6![Alaska Airlines logo]()
$667
This United Airlines deal was found by Cheapflights users on 9/8. 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 11/114:29 pm -
1 stop7h 22m
Sat 11/145:00 am -
2 stops8h 56m
Deal found 9/8![United Airlines logo]()
$484
This United Airlines deal was found by Cheapflights users on 9/9. 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 10/295:12 pm -
1 stop7h 28m
Mon 11/25:00 am -
2 stops12h 58m
Deal found 9/9![United Airlines logo]()
$521
This United Airlines deal was found by Cheapflights users on 9/10. 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.
Fri 10/25:15 pm -
1 stop7h 44m
Tue 10/65:00 am -
1 stop7h 08m
Deal found 9/10![United Airlines logo]()
$536
Last-minute flights from Greenville to OntarioDiscover last-minute flight deals from Greenville to Ontario. Data last updated September 11, 2026 and is based on user searches.
Discover last-minute flight deals from Greenville to Ontario. Data last updated September 11, 2026 and is based on user searches.
This American Airlines deal was found by Cheapflights users on 9/8. 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 10/17:46 pm -
1 stop6h 50m
Wed 10/710:10 pm -
1 stop7h 14m
Deal found 9/8![American Airlines logo]()
$505
This American Airlines deal was found by Cheapflights users on 9/10. 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 10/35:24 pm -
1 stop8h 13m
Tue 10/1310:10 pm -
1 stop7h 14m
Deal found 9/10![American Airlines logo]()
$406
This American Airlines deal was found by Cheapflights users on 9/8. 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.
Tue 10/68:00 am -
1 stop8h 30m
Tue 10/610:10 pm -
1 stop7h 14m
Deal found 9/8![American Airlines logo]()
$495
This American Airlines deal was found by Cheapflights users on 9/10. 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 10/106:02 pm -
1 stop7h 57m
Tue 10/2012:43 pm -
1 stop6h 22m
Deal found 9/10![American Airlines logo]()
$479
This United Airlines deal was found by Cheapflights users on 9/10. 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 10/105:46 pm -
1 stop8h 03m
Sat 10/176:00 am -
2 stops11h 58m
Deal found 9/10![United Airlines logo]()
$484
This American Airlines deal was found by Cheapflights users on 9/10. 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 10/107:45 pm -
1 stop7h 07m
Sat 10/1712:43 pm -
1 stop6h 22m
Deal found 9/10![American Airlines logo]()
$499
This American Airlines deal was found by Cheapflights users on 9/10. 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.
Tue 10/137:45 pm -
1 stop7h 07m
Tue 10/207:00 am -
1 stop9h 10m
Deal found 9/10![American Airlines logo]()
$369
This Delta deal was found by Cheapflights users on 9/10. 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 10/1611:45 am -
1 stop9h 36m
Fri 10/2311:15 pm -
1 stop7h 46m
Deal found 9/10![Delta logo]()
$409
This Delta deal was found by Cheapflights users on 9/10. 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 10/163:39 pm -
1 stop9h 30m
Tue 10/2012:16 pm -
1 stop7h 35m
Deal found 9/10![Delta logo]()
$464
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 September 11, 2026.
Search for one-way flight options from Greenville to Ontario. Find affordable one-way fares based on user searches. Data last updated September 11, 2026.
This Delta deal was found by Cheapflights users on 9/10. 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 10/36:00 am -
1 stop8h 07m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/10![Delta logo]()
$185
This United Airlines deal was found by Cheapflights users on 9/8. 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 10/66:20 am -
2 stops14h 21m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/8![United Airlines logo]()
$190
This eDestinos deal was found by Cheapflights users on 9/10. 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.
Fri 10/27:20 pm -
3 stops31h 27m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/10![Multiple Airlines logo]()
$193
This Kiwi.com deal was found by Cheapflights users on 9/9. 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.
Fri 10/232:49 pm -
3 stops22h 40m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/9![Multiple Airlines logo]()
$195
This Kiwi.com deal was found by Cheapflights users on 9/10. 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 10/1312:29 pm -
3 stops25h 00m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/10![Multiple Airlines logo]()
$201
This Delta deal was found by Cheapflights users on 9/8. 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 10/26:25 pm -
1 stop6h 59m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/8![Delta logo]()
$205
This Southwest deal was found by Cheapflights users on 9/9. 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 10/236:25 am -
2 stops11h 00m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/9![Southwest logo]()
$210
This American Airlines deal was found by Cheapflights users on 9/10. 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 10/25:24 pm -
1 stop8h 13m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/10![American Airlines logo]()
$212
This American Airlines deal was found by Cheapflights users on 9/7. 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 10/224:10 pm -
1 stop9h 49m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/7![American Airlines logo]()
$221
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 September 11, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $369 (Delta) |
One-way from | $185 (Delta) |
Popular in | April |
Cheapest in | January |
Average price | $447 |
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 September 11, 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
Sat 10/3
2:00 pm-6:41 pm
1 stop7h 41m
Ontario
Wed 12/31
12:00 am-3:00 am
Nonstop0h 00m
$185
GreenvilleOntario
GSP Greenville - ONT Ontario
GSPONT
Greenville
Tue 10/6
5:25 pm-11:52 pm
1 stop9h 27m
Ontario
Wed 12/31
12:00 am-3:00 am
Nonstop0h 00m
$185
GreenvilleOntario
GSP Greenville - ONT Ontario
GSPONT
Greenville
Fri 10/23
4:25 pm-8:58 pm
1 stop7h 33m
Ontario
Wed 12/31
12:00 am-3:00 am
Nonstop0h 00m
$205
Quickest round-trip
GreenvilleOntario
GSP Greenville - ONT Ontario
GSPONT
Greenville
Fri 10/2
6:25 pm-10:24 pm
1 stop6h 59m
Ontario
Wed 12/31
12:00 am-3:00 am
Nonstop0h 00m
$205
GreenvilleOntario
GSP Greenville - ONT Ontario
GSPONT
Greenville
Fri 10/23
6:25 am-2:25 pm
2 stops11h 00m
Ontario
Wed 12/31
12:00 am-3:00 am
Nonstop0h 00m
$210
GreenvilleOntario
GSP Greenville - ONT Ontario
GSPONT
Greenville
Fri 10/16
3:39 pm-10:09 pm
1 stop9h 30m
Ontario
Wed 12/31
12:00 am-3:00 am
Nonstop0h 00m
$222
GreenvilleOntario
GSP Greenville - ONT Ontario
GSPONT
Greenville
Sat 10/3
10:45 am-10:51 pm
2 stops15h 06m
Ontario
Wed 12/31
12:00 am-3:00 am
Nonstop0h 00m
$227
GreenvilleOntario
GSP Greenville - ONT Ontario
GSPONT
Greenville
Tue 10/6
11:28 am-9:09 am
3 stops24h 41m
Ontario
Wed 12/31
12:00 am-3:00 am
Nonstop0h 00m
$228
GreenvilleOntario
GSP Greenville - ONT Ontario
GSPONT
Greenville
Thu 10/22
4:02 pm-11:50 pm
2 stops34h 48m
Ontario
Wed 12/31
12:00 am-3:00 am
Nonstop0h 00m
$231
GreenvilleOntario
GSP Greenville - ONT Ontario
GSPONT
Greenville
Tue 10/13
11:28 am-10:29 am
2 stops26h 01m
Ontario
Wed 12/31
12:00 am-3:00 am
Nonstop0h 00m
$243
Showing 1-10 of 16 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 September.
| 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 September 11, 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.
Comfort
7.8
Crew
8.5
Food
7.2
Boarding
8.1
Overall
7.8
Entertainment
7.8
Reviews
1 / 20
8.0
ExcellentMatthew,Oct 2025
GSP - ATL
Comfort
7.8
Crew
8.5
Food
7.2
Boarding
8.1
Overall
7.8
Entertainment
7.8
Reviews
1 / 20
8.0
ExcellentMatthew,Oct 2025
GSP - ATL
Comfort
7.8
Crew
8.5
Food
7.2
Boarding
8.1
Overall
7.8
Entertainment
7.8
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.
Search flights from Greenville to Ontario by cabin class
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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 11, 2026.
Greenville and Ontario flights
Browse other Greenville and Ontario flight options. Last updated on September 11, 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 September 11, 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 September 11, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$351 | Average$446 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$368 | Average$480 | FlexibilityNo cancel fee | On-time71% |