$182+ Cheap flights from Greenville to Ontario (GSP - 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 10/10. Fares are subject to change and may not be available on all flights or dates of travel.
GSP — ONT
Aug 13 — Aug 201
Round-trip
1 adult, Economy
We work with more than 300 partners to bring you better travel deals
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
Cheapest
Best
Last-minute
One-way
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 July 14, 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 July 14, 2026.
This American Airlines deal was found by Cheapflights users on 7/10. 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 8/185:28 pm
GSP
- ONT
1 stop8h 31m
American Airlines
Sat 8/2912:33 pm
ONT
- GSP
1 stop6h 44m
American Airlines
Deal found 7/10![American Airlines logo]()
$299
This Southwest deal was found by Cheapflights users on 7/13. 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 8/187:00 am
GSP
- ONT
2 stops8h 40m
Southwest
Sat 8/298:45 am
ONT
- GSP
1 stop5h 45m
Southwest
Deal found 7/13![Southwest logo]()
$368
This Delta deal was found by Cheapflights users on 7/10. 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 9/256:25 pm
GSP
- ONT
1 stop7h 01m
Delta
Wed 9/3012:17 pm
ONT
- GSP
1 stop7h 43m
Delta
Deal found 7/10![Delta logo]()
$409
This United Airlines deal was found by Cheapflights users on 7/10. 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 11/1710:21 am
GSP
- ONT
2 stops13h 35m
United Airlines
Wed 11/185:00 am
ONT
- GSP
1 stop6h 48m
United Airlines
Deal found 7/10![United Airlines logo]()
$414
This Delta deal was found by Cheapflights users on 7/12. 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 9/186:25 pm
GSP
- ONT
1 stop7h 01m
Delta
Mon 9/2110:00 pm
ONT
- GSP
1 stop8h 25m
Delta
Deal found 7/12![Delta logo]()
$415
This Delta deal was found by Cheapflights users on 7/10. 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 8/285:20 pm
GSP
- ONT
1 stop7h 32m
Delta
Fri 9/412:00 pm
ONT
- GSP
1 stop7h 59m
Delta
Deal found 7/10![Delta logo]()
$419
This Southwest deal was found by Cheapflights users on 7/13. 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 9/177:00 am
GSP
- ONT
1 stop11h 30m
Southwest
Mon 9/2110:00 am
ONT
- GSP
1 stop8h 35m
Southwest
Deal found 7/13![Southwest logo]()
$420
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 July 14, 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 July 14, 2026.
This Southwest deal was found by Cheapflights users on 7/13. 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 8/187:00 am
GSP
- ONT
2 stops8h 30m
Southwest
Sat 8/295:50 am
ONT
- GSP
2 stops8h 40m
Southwest
Deal found 7/13![Southwest logo]()
$373
This Delta deal was found by Cheapflights users on 7/10. 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.
Mon 10/125:05 pm
GSP
- ONT
1 stop7h 56m
Delta
Fri 10/1611:15 pm
ONT
- GSP
1 stop7h 10m
Delta
Deal found 7/10![Delta logo]()
$409
This United Airlines deal was found by Cheapflights users on 7/9. 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.
Fri 9/45:43 pm
GSP
- ONT
1 stop7h 52m
United Airlines
Fri 9/115:00 am
ONT
- GSP
1 stop7h 14m
United Airlines
Deal found 7/9![United Airlines logo]()
$441
This Delta deal was found by Cheapflights users on 7/10. 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 8/285:20 pm
GSP
- ONT
1 stop7h 32m
Delta
Fri 9/412:00 pm
ONT
- GSP
1 stop7h 59m
Delta
Deal found 7/10![Delta logo]()
$419
This Southwest deal was found by Cheapflights users on 7/12. 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.
Sun 8/301:20 pm
GSP
- ONT
2 stops9h 15m
Southwest
Fri 10/3011:00 am
ONT
- GSP
2 stops8h 45m
Southwest
Deal found 7/12![Southwest logo]()
$425
This United Airlines deal was found by Cheapflights users on 7/12. 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 11/174:29 pm
GSP
- ONT
1 stop7h 27m
United Airlines
Wed 11/185:00 am
ONT
- GSP
1 stop6h 48m
United Airlines
Deal found 7/12![United Airlines logo]()
$473
This Southwest deal was found by Cheapflights users on 7/12. 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 9/177:00 am
GSP
- ONT
2 stops10h 00m
Southwest
Sun 9/208:10 pm
ONT
- GSP
2 stops19h 10m
Southwest
Deal found 7/12![Southwest logo]()
$475
This United Airlines deal was found by Cheapflights users on 7/10. 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 10/314:29 pm
GSP
- ONT
1 stop7h 27m
United Airlines
Sun 11/85:00 am
ONT
- GSP
1 stop6h 48m
United Airlines
Deal found 7/10![United Airlines logo]()
$493
This Southwest deal was found by Cheapflights users on 7/13. 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 9/177:00 am
GSP
- ONT
2 stops10h 00m
Southwest
Mon 9/217:00 am
ONT
- GSP
2 stops8h 20m
Southwest
Deal found 7/13![Southwest logo]()
$503
Last-minute flights from Greenville to OntarioDiscover last-minute flight deals from Greenville to Ontario. Data last updated July 14, 2026 and is based on user searches.
Discover last-minute flight deals from Greenville to Ontario. Data last updated July 14, 2026 and is based on user searches.
This American Airlines deal was found by Cheapflights users on 7/10. 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 8/185:28 pm
GSP
- ONT
1 stop8h 31m
American Airlines
Sat 8/2912:33 pm
ONT
- GSP
1 stop6h 44m
American Airlines
Deal found 7/10![American Airlines logo]()
$299
This Southwest deal was found by Cheapflights users on 7/13. 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 8/187:00 am
GSP
- ONT
2 stops8h 40m
Southwest
Sat 8/298:45 am
ONT
- GSP
1 stop5h 45m
Southwest
Deal found 7/13![Southwest logo]()
$368
This Delta deal was found by Cheapflights users on 7/10. 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 8/285:20 pm
GSP
- ONT
1 stop7h 32m
Delta
Fri 9/412:00 pm
ONT
- GSP
1 stop7h 59m
Delta
Deal found 7/10![Delta logo]()
$419
This Southwest deal was found by Cheapflights users on 7/12. 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.
Sun 8/301:20 pm
GSP
- ONT
2 stops9h 15m
Southwest
Fri 10/3011:00 am
ONT
- GSP
2 stops8h 45m
Southwest
Deal found 7/12![Southwest logo]()
$425
This American Airlines deal was found by Cheapflights users on 7/12. 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.
Sun 8/307:00 am
GSP
- ONT
1 stop7h 43m
American Airlines
Fri 10/3010:25 am
ONT
- GSP
1 stop8h 46m
American Airlines
Deal found 7/12![American Airlines logo]()
$467
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 July 14, 2026.
Search for one-way flight options from Greenville to Ontario. Find affordable one-way fares based on user searches. Data last updated July 14, 2026.
This Delta deal was found by Cheapflights users on 7/14. 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.
Sat 10/103:42 pm
GSP
- ONT
1 stop6h 50m
Delta
Deal found 7/14![Delta logo]()
$182
This Delta deal was found by Cheapflights users on 7/14. 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 10/95:05 pm
GSP
- ONT
1 stop7h 56m
Delta
Deal found 7/14![Delta logo]()
$234
This United Airlines deal was found by Cheapflights users on 7/14. 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.
Sat 10/102:16 pm
GSP
- ONT
2 stops11h 43m
United Airlines
Deal found 7/14![United Airlines logo]()
$242
This Kiwi.com deal was found by Cheapflights users on 7/9. 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 7/318:45 pm
GSP
- ONT
2 stops37h 47m
Multiple Airlines
Deal found 7/9![Multiple Airlines logo]()
$248
This Kiwi.com deal was found by Cheapflights users on 7/13. 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 7/248:20 am
GSP
- ONT
2 stops50h 12m
Multiple Airlines
Deal found 7/13![Multiple Airlines logo]()
$259
This Delta deal was found by Cheapflights users on 7/14. 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.
Thu 10/86:45 am
GSP
- ONT
1 stop7h 23m
Delta
Deal found 7/14![Delta logo]()
$260
This American Airlines deal was found by Cheapflights users on 7/9. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/305:28 pm
GSP
- ONT
1 stop9h 31m
American Airlines
Deal found 7/9![American Airlines logo]()
$269
This Delta deal was found by Cheapflights users on 7/13. 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.
Mon 7/275:16 pm
GSP
- ONT
1 stop7h 34m
Delta
Deal found 7/13![Delta logo]()
$294
This American Airlines deal was found by Cheapflights users on 7/12. 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 7/298:01 pm
GSP
- ONT
1 stop6h 58m
American Airlines
Deal found 7/12![American Airlines logo]()
$295
This Southwest deal was found by Cheapflights users on 7/9. 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.
Wed 7/297:00 am
GSP
- ONT
2 stops8h 40m
Southwest
Deal found 7/9![Southwest logo]()
$299
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 July 14, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $299 (American Airlines) |
One-way from | $182 (Delta) |
Popular in | April |
Cheapest in | January |
Average price | $494 |
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 2,558,603 searches. Data last updated July 14, 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 - ONT
GSPONT
Greenville
Tue 8/18
7:00 am-12:30 pm
2 stops8h 30m
Ontario
Sat 8/29
5:50 am-5:30 pm
2 stops8h 40m
$373
GreenvilleOntario
GSP - ONT
GSPONT
Greenville
Mon 10/12
5:05 pm-10:01 pm
1 stop7h 56m
Ontario
Fri 10/16
11:15 pm-9:25 am
1 stop7h 10m
$409
GreenvilleOntario
GSP - ONT
GSPONT
Greenville
Fri 8/28
5:20 pm-9:52 pm
1 stop7h 32m
Ontario
Fri 9/4
12:00 pm-10:59 pm
1 stop7h 59m
$419
GreenvilleOntario
GSP - ONT
GSPONT
Greenville
Sun 8/30
1:20 pm-7:35 pm
2 stops9h 15m
Ontario
Fri 10/30
11:00 am-10:45 pm
2 stops8h 45m
$425
GreenvilleOntario
GSP - ONT
GSPONT
Greenville
Fri 9/4
5:43 pm-10:35 pm
1 stop7h 52m
Ontario
Fri 9/11
5:00 am-3:14 pm
1 stop7h 14m
$441
Quickest round-trip
GreenvilleOntario
GSP - ONT
GSPONT
Greenville
Tue 11/17
4:29 pm-8:56 pm
1 stop7h 27m
Ontario
Wed 11/18
5:00 am-2:48 pm
1 stop6h 48m
$473
GreenvilleOntario
GSP - ONT
GSPONT
Greenville
Thu 9/17
7:00 am-2:00 pm
2 stops10h 00m
Ontario
Sun 9/20
8:10 pm-6:20 pm
2 stops19h 10m
$475
GreenvilleOntario
GSP - ONT
GSPONT
Greenville
Sat 10/31
4:29 pm-8:56 pm
1 stop7h 27m
Ontario
Sun 11/8
5:00 am-2:48 pm
1 stop6h 48m
$493
GreenvilleOntario
GSP - ONT
GSPONT
Greenville
Thu 9/17
7:00 am-2:00 pm
2 stops10h 00m
Ontario
Mon 9/21
7:00 am-6:20 pm
2 stops8h 20m
$503
Cheapest one-way
Quickest one-way
GreenvilleOntario
GSP - ONT
GSPONT
Greenville
Sat 10/10
3:42 pm-7:32 pm
1 stop6h 50m
$182
Showing 1-10 of 21 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 July.
| 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.
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 July 14, 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.
Boarding
8.1
Crew
8.5
Entertainment
7.8
Food
7.2
Comfort
7.8
Overall
7.8
Reviews
1 / 20
8.0
ExcellentMatthew,Oct 2025
GSP - ATL
Boarding
8.1
Crew
8.5
Entertainment
7.8
Food
7.2
Comfort
7.8
Overall
7.8
Reviews
1 / 20
8.0
ExcellentMatthew,Oct 2025
GSP - ATL
Boarding
8.1
Crew
8.5
Entertainment
7.8
Food
7.2
Comfort
7.8
Overall
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.
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.
Alternative routes
Complete your trip
Flights by cabin class
Ontario flight routes
Other flight options
Other flights from Greenville
Popular flights
Alternative routes for Greenville to Ontario
See prices for flight routes from nearby airports that may be better suited for you.
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
Find flights from Greenville 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 July 14, 2026.
Greenville and Ontario flights
Browse other Greenville and Ontario flight options. Last updated on July 14, 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 July 14, 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 2,558,603 searches. Data last updated July 14, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$351 | Average$434 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$368 | Average$480 | FlexibilityNo cancel fee | On-time71% |