$185+ 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 7/20. Fares are subject to change and may not be available on all flights or dates of travel.
GSP — ONT
May 17 — May 241
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
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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 April 17, 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 April 17, 2026.
This Southwest deal was found by Cheapflights users on 4/15. 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.
Tue 5/198:20 am
GSP
- ONT
1 stop11h 00m
Southwest
Tue 5/269:55 pm
ONT
- GSP
1 stop12h 15m
Southwest
Deal found 4/15![Southwest logo]()
$388
This American Airlines deal was found by Cheapflights users on 4/13. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/75:12 pm
GSP
- ONT
1 stop9h 34m
American Airlines
Tue 5/1210:26 pm
ONT
- GSP
1 stop7h 09m
American Airlines
Deal found 4/13![American Airlines logo]()
$396
This Southwest deal was found by Cheapflights users on 4/13. 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 5/78:10 am
GSP
- ONT
1 stop10h 05m
Southwest
Tue 5/129:55 pm
ONT
- GSP
2 stops11h 15m
Southwest
Deal found 4/13![Southwest logo]()
$401
This Southwest deal was found by Cheapflights users on 4/14. 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 6/38:20 am
GSP
- ONT
1 stop11h 00m
Southwest
Mon 6/89:40 pm
ONT
- GSP
2 stops11h 35m
Southwest
Deal found 4/14![Southwest logo]()
$407
This American Airlines deal was found by Cheapflights users on 4/14. 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 6/37:54 pm
GSP
- ONT
1 stop7h 05m
American Airlines
Mon 6/810:00 pm
ONT
- GSP
1 stop7h 18m
American Airlines
Deal found 4/14![American Airlines logo]()
$421
This American Airlines deal was found by Cheapflights users on 4/16. 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.
Tue 6/167:54 pm
GSP
- ONT
1 stop7h 05m
American Airlines
Fri 7/1012:39 pm
ONT
- GSP
1 stop7h 38m
American Airlines
Deal found 4/16![American Airlines logo]()
$460
This Delta deal was found by Cheapflights users on 4/13. 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.
Wed 7/295:44 am
GSP
- ONT
1 stop7h 54m
Delta
Wed 8/510:00 pm
ONT
- GSP
1 stop8h 13m
Delta
Deal found 4/13![Delta logo]()
$467
This Delta deal was found by Cheapflights users on 4/15. 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.
Tue 5/126:45 am
GSP
- ONT
1 stop7h 12m
Delta
Wed 5/2010:00 pm
ONT
- GSP
1 stop8h 04m
Delta
Deal found 4/15![Delta logo]()
$471
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 April 17, 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 April 17, 2026.
This Southwest deal was found by Cheapflights users on 4/13. 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 5/78:10 am
GSP
- ONT
1 stop10h 05m
Southwest
Tue 5/129:55 pm
ONT
- GSP
2 stops11h 15m
Southwest
Deal found 4/13![Southwest logo]()
$401
This United Airlines deal was found by Cheapflights users on 4/13. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/95:00 pm
GSP
- ONT
1 stop7h 58m
United Airlines
Tue 5/125:00 am
ONT
- GSP
1 stop6h 49m
United Airlines
Deal found 4/13![United Airlines logo]()
$506
This Delta deal was found by Cheapflights users on 4/16. 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.
Mon 5/45:23 pm
GSP
- ONT
1 stop6h 37m
Delta
Fri 5/810:00 pm
ONT
- GSP
1 stop8h 07m
Delta
Deal found 4/16![Delta logo]()
$562
This United Airlines deal was found by Cheapflights users on 4/16. 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 5/2710:30 am
GSP
- ONT
2 stops15h 21m
United Airlines
Sat 5/306:30 am
ONT
- GSP
1 stop7h 30m
United Airlines
Deal found 4/16![United Airlines logo]()
$539
This Southwest deal was found by Cheapflights users on 4/16. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/167:00 am
GSP
- ONT
2 stops8h 40m
Southwest
Fri 7/109:40 pm
ONT
- GSP
2 stops11h 35m
Southwest
Deal found 4/16![Southwest logo]()
$544
This Delta deal was found by Cheapflights users on 4/15. 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.
Tue 5/56:51 am
GSP
- ONT
1 stop7h 45m
Delta
Wed 5/1310:00 pm
ONT
- GSP
1 stop8h 04m
Delta
Deal found 4/15![Delta logo]()
$573
Last-minute flights from Greenville to OntarioDiscover last-minute flight deals from Greenville to Ontario. Data last updated April 17, 2026 and is based on user searches.
Discover last-minute flight deals from Greenville to Ontario. Data last updated April 17, 2026 and is based on user searches.
This Delta deal was found by Cheapflights users on 4/16. 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.
Mon 5/45:23 pm
GSP
- ONT
1 stop6h 37m
Delta
Fri 5/810:00 pm
ONT
- GSP
1 stop8h 07m
Delta
Deal found 4/16![Delta logo]()
$562
This American Airlines deal was found by Cheapflights users on 4/13. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/75:12 pm
GSP
- ONT
1 stop9h 34m
American Airlines
Tue 5/1210:26 pm
ONT
- GSP
1 stop7h 09m
American Airlines
Deal found 4/13![American Airlines logo]()
$396
This Southwest deal was found by Cheapflights users on 4/13. 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 5/78:10 am
GSP
- ONT
1 stop10h 05m
Southwest
Tue 5/129:55 pm
ONT
- GSP
2 stops11h 15m
Southwest
Deal found 4/13![Southwest logo]()
$401
This United Airlines deal was found by Cheapflights users on 4/12. 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.
Sat 5/95:00 pm
GSP
- ONT
1 stop7h 58m
United Airlines
Tue 5/127:00 am
ONT
- GSP
1 stop6h 59m
United Airlines
Deal found 4/12![United Airlines logo]()
$506
This Delta deal was found by Cheapflights users on 4/15. 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.
Tue 5/126:45 am
GSP
- ONT
1 stop7h 12m
Delta
Wed 5/2010:00 pm
ONT
- GSP
1 stop8h 04m
Delta
Deal found 4/15![Delta logo]()
$471
This Southwest deal was found by Cheapflights users on 4/15. 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.
Tue 5/198:20 am
GSP
- ONT
1 stop11h 00m
Southwest
Tue 5/269:55 pm
ONT
- GSP
1 stop12h 15m
Southwest
Deal found 4/15![Southwest logo]()
$388
This United Airlines deal was found by Cheapflights users on 4/15. 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.
Wed 5/2710:30 am
GSP
- ONT
2 stops15h 16m
United Airlines
Sat 5/306:30 am
ONT
- GSP
1 stop7h 30m
United Airlines
Deal found 4/15![United Airlines logo]()
$539
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 April 17, 2026.
Search for one-way flight options from Greenville to Ontario. Find affordable one-way fares based on user searches. Data last updated April 17, 2026.
This Kiwi.com deal was found by Cheapflights users on 4/13. 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.
Mon 7/206:19 pm
GSP
- ONT
2 stops47h 50m
Multiple Airlines
Deal found 4/13![Multiple Airlines logo]()
$185
This Delta deal was found by Cheapflights users on 4/14. 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.
Wed 5/131:09 pm
GSP
- ONT
1 stop8h 27m
Delta
Deal found 4/14![Delta logo]()
$192
This United Airlines deal was found by Cheapflights users on 4/15. 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 5/235:10 pm
GSP
- ONT
1 stop7h 45m
United Airlines
Deal found 4/15![United Airlines logo]()
$205
This Southwest deal was found by Cheapflights users on 4/15. 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 5/2310:45 am
GSP
- ONT
2 stops10h 05m
Southwest
Deal found 4/15![Southwest logo]()
$210
This Trip.com deal was found by Cheapflights users on 4/14. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/245:43 pm
GSP
- ONT
2 stops31h 54m
Multiple Airlines
Deal found 4/14![Multiple Airlines logo]()
$217
This Delta deal was found by Cheapflights users on 4/13. 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.
Tue 7/145:16 pm
GSP
- ONT
1 stop7h 28m
Delta
Deal found 4/13![Delta logo]()
$234
This Southwest deal was found by Cheapflights users on 4/13. 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.
Sat 7/1812:50 pm
GSP
- ONT
2 stops10h 10m
Southwest
Deal found 4/13![Southwest logo]()
$239
This United Airlines deal was found by Cheapflights users on 4/14. 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.
Wed 5/275:41 pm
GSP
- ONT
1 stop8h 05m
United Airlines
Deal found 4/14![United Airlines logo]()
$247
This Southwest deal was found by Cheapflights users on 4/13. 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.
Mon 6/812:55 pm
GSP
- ONT
2 stops11h 10m
Southwest
Deal found 4/13![Southwest logo]()
$249
This United Airlines deal was found by Cheapflights users on 4/16. 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.
Thu 5/75:45 pm
GSP
- ONT
1 stop7h 50m
United Airlines
Deal found 4/16![United Airlines logo]()
$260
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 April 17, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $388 (Southwest) |
One-way from | $185 (Kiwi.com) |
Popular in | April |
Cheapest in | January |
Average price | $812 |
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 April 17, 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
Thu 5/7
8:10 am-3:15 pm
1 stop10h 05m
Ontario
Tue 5/12
9:55 pm-12:10 pm
2 stops11h 15m
$401
GreenvilleOntario
GSP - ONT
GSPONT
Greenville
Sat 5/9
5:00 pm-9:58 pm
1 stop7h 58m
Ontario
Tue 5/12
5:00 am-2:49 pm
1 stop6h 49m
$506
GreenvilleOntario
GSP - ONT
GSPONT
Greenville
Wed 5/27
10:30 am-10:51 pm
2 stops15h 21m
Ontario
Sat 5/30
6:30 am-5:00 pm
1 stop7h 30m
$539
GreenvilleOntario
GSP - ONT
GSPONT
Greenville
Tue 6/16
7:00 am-12:40 pm
2 stops8h 40m
Ontario
Fri 7/10
9:40 pm-12:15 pm
2 stops11h 35m
$544
Quickest round-trip
GreenvilleOntario
GSP - ONT
GSPONT
Greenville
Mon 5/4
5:23 pm-9:00 pm
1 stop6h 37m
Ontario
Fri 5/8
10:00 pm-9:07 am
1 stop8h 07m
$562
GreenvilleOntario
GSP - ONT
GSPONT
Greenville
Tue 5/5
6:51 am-11:36 am
1 stop7h 45m
Ontario
Wed 5/13
10:00 pm-9:04 am
1 stop8h 04m
$573
Cheapest one-way
GreenvilleOntario
GSP - ONT
GSPONT
Greenville
Wed 5/13
1:09 pm-6:36 pm
1 stop8h 27m
$192
GreenvilleOntario
GSP - ONT
GSPONT
Greenville
Sat 5/23
5:10 pm-9:55 pm
1 stop7h 45m
$205
GreenvilleOntario
GSP - ONT
GSPONT
Greenville
Sat 5/23
10:45 am-5:50 pm
2 stops10h 05m
$210
Quickest one-way
GreenvilleOntario
GSP - ONT
GSPONT
Greenville
Tue 7/14
5:16 pm-9:44 pm
1 stop7h 28m
$234
Showing 1-10 of 17 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 April.
| 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 April 17, 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
7.9
Entertainment
7.8
Crew
8.5
Overall
7.9
Boarding
8.1
Food
7.2
Reviews
1 / 20
8.0
ExcellentMatthew,Oct 2025
GSP - ATL
Comfort
7.9
Entertainment
7.8
Crew
8.5
Overall
7.9
Boarding
8.1
Food
7.2
Reviews
1 / 20
8.0
ExcellentMatthew,Oct 2025
GSP - ATL
Comfort
7.9
Entertainment
7.8
Crew
8.5
Overall
7.9
Boarding
8.1
Food
7.2
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
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 April 17, 2026.
Greenville and Ontario flights
Browse other Greenville and Ontario flight options. Last updated on April 17, 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 April 17, 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 April 17, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$312 | Average$450 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$351 | Average$434 | FlexibilityNo cancel fee | On-timeN/A |