$219+ Cheap flights from Ontario to Greenville (ONT - GSP)
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 10/28. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — GSP
Oct 8 — Oct 151
Round-trip
1 adult, Economy
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Find cheap flights from Ontario to Greenville 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 Ontario to Greenville
Cheapest
Best
Last-minute
One-way
Cheapest flights from Ontario to GreenvilleExplore the most affordable flight options available from Ontario to Greenville. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 8, 2026.
Explore the most affordable flight options available from Ontario to Greenville. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 8, 2026.
This Southwest deal was found by Cheapflights users on 9/3. 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 10/2211:00 am -
2 stops8h 50m
Sat 10/246:40 am -
1 stop10h 50m
Deal found 9/3![Southwest logo]()
$390
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.
Wed 10/287:00 am -
1 stop6h 35m
Sat 11/77:51 am -
1 stop7h 01m
Deal found 9/7![American Airlines logo]()
$443
This American Airlines deal was found by Cheapflights users on 9/4. 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 10/1012:43 pm -
1 stop6h 22m
Sat 10/177:45 pm -
1 stop7h 07m
Deal found 9/4![American Airlines logo]()
$444
This Southwest 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/286:20 am -
2 stops9h 10m
Sat 11/710:50 am -
1 stop7h 10m
Deal found 9/7![Southwest logo]()
$448
This Southwest deal was found by Cheapflights users on 9/4. 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 11/117:50 am -
2 stops9h 55m
Thu 11/126:40 am -
1 stop12h 05m
Deal found 9/4![Southwest logo]()
$454
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.
Wed 12/305:44 am -
1 stop7h 55m
Wed 1/65:55 pm -
1 stop8h 22m
Deal found 9/7![American Airlines logo]()
$460
This Delta 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/1612:16 pm -
1 stop7h 35m
Tue 10/205:00 pm -
1 stop6h 25m
Deal found 9/6![Delta logo]()
$463
This United 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/316:59 am -
1 stop6h 57m
Tue 11/34:29 pm -
1 stop7h 22m
Deal found 9/7![United Airlines logo]()
$479
This American Airlines deal was found by Cheapflights users on 9/3. 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 9/2210:25 am -
1 stop8h 46m
Tue 9/295:24 pm -
1 stop8h 13m
Deal found 9/3![American Airlines logo]()
$483
Best flights from Ontario to GreenvilleDiscover carefully curated flight deals from Ontario to Greenville that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated September 8, 2026.
Discover carefully curated flight deals from Ontario to Greenville that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated September 8, 2026.
This Southwest deal was found by Cheapflights users on 9/3. 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 10/2211:00 am -
2 stops8h 50m
Sat 10/246:40 am -
1 stop10h 50m
Deal found 9/3![Southwest logo]()
$390
This United 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/316:59 am -
1 stop6h 57m
Tue 11/34:29 pm -
1 stop7h 22m
Deal found 9/7![United Airlines logo]()
$479
This Delta 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/410:00 pm -
1 stop8h 25m
Sun 10/1111:45 am -
1 stop9h 37m
Deal found 9/6![Delta logo]()
$532
This Southwest 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/910:05 am -
2 stops7h 40m
Wed 12/162:50 pm -
2 stops9h 50m
Deal found 9/6![Southwest logo]()
$453
This Southwest deal was found by Cheapflights users on 9/4. 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 11/117:50 am -
2 stops9h 55m
Thu 11/126:40 am -
2 stops10h 25m
Deal found 9/4![Southwest logo]()
$453
Last-minute flights from Ontario to GreenvilleDiscover last-minute flight deals from Ontario to Greenville. Data last updated September 8, 2026 and is based on user searches.
Discover last-minute flight deals from Ontario to Greenville. Data last updated September 8, 2026 and is based on user searches.
This American Airlines deal was found by Cheapflights users on 9/3. 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 9/2210:25 am -
1 stop8h 46m
Tue 9/295:24 pm -
1 stop8h 13m
Deal found 9/3![American Airlines logo]()
$483
This American Airlines deal was found by Cheapflights users on 9/4. 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 10/1012:43 pm -
1 stop6h 22m
Sat 10/177:45 pm -
1 stop7h 07m
Deal found 9/4![American Airlines logo]()
$444
This Delta 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/1612:16 pm -
1 stop7h 35m
Tue 10/205:00 pm -
1 stop6h 25m
Deal found 9/6![Delta logo]()
$463
This Southwest deal was found by Cheapflights users on 9/3. 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 10/2211:00 am -
2 stops8h 50m
Sat 10/246:40 am -
1 stop10h 50m
Deal found 9/3![Southwest logo]()
$390
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.
Wed 10/287:00 am -
1 stop6h 35m
Sat 11/77:51 am -
1 stop7h 01m
Deal found 9/7![American Airlines logo]()
$443
This Southwest 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/286:20 am -
2 stops9h 10m
Sat 11/710:50 am -
1 stop7h 10m
Deal found 9/7![Southwest logo]()
$448
This United 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/316:59 am -
1 stop6h 57m
Tue 11/34:29 pm -
1 stop7h 22m
Deal found 9/7![United Airlines logo]()
$479
One-way flights from Ontario to GreenvilleSearch for one-way flight options from Ontario to Greenville. Find affordable one-way fares based on user searches. Data last updated September 8, 2026.
Search for one-way flight options from Ontario to Greenville. Find affordable one-way fares based on user searches. Data last updated September 8, 2026.
This Kiwi.com 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/285:07 pm -
3 stops43h 40m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/7![Multiple Airlines logo]()
$219
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.
Wed 10/2812:43 pm -
1 stop6h 22m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/7![American Airlines logo]()
$222
This American Airlines deal was found by Cheapflights users on 9/4. 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 10/2410:10 pm -
1 stop7h 14m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/4![American Airlines logo]()
$226
This Southwest deal was found by Cheapflights users on 9/4. 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 10/246:20 am -
2 stops11h 20m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/4![Southwest logo]()
$227
This Kiwi.com deal was found by Cheapflights users on 9/4. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/2411:52 am -
3 stops43h 59m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/4![Multiple Airlines logo]()
$233
This United Airlines deal was found by Cheapflights users on 9/3. 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 11/75:00 am -
2 stops12h 58m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/3![United Airlines logo]()
$245
This Delta 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/226:20 am -
2 stops12h 27m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/6![Delta logo]()
$315
This American Airlines deal was found by Cheapflights users on 9/5. 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 10/2212:43 pm -
1 stop6h 22m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/5![American Airlines logo]()
$320
This deal was found by Cheapflights users on 9/4. 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 is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/155:00 am -
1 stop7h 08m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/4![United Airlines logo]()
$443
Find flight deals from Ontario to Greenville
Discover tips and strategies to find the most affordable flight options for your journey from Ontario (ONT) to Greenville (GSP). 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 8, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $390 (Southwest) |
One-way from | $219 (Kiwi.com) |
Popular in | December |
Cheapest in | October |
Average price | $449 |
Cheapflights Fare Finder
Customize your flight search to find flights from Ontario to Greenville 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 8, 2026.
Use the filters below to find and compare flights from Ontario to Greenville that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
OntarioGreenville
ONT Ontario - GSP Greenville
ONTGSP
Ontario
Sat 10/24
6:20 am-8:40 pm
2 stops11h 20m
Greenville
Wed 12/31
12:00 am-9:00 pm
Nonstop0h 00m
$227
OntarioGreenville
ONT Ontario - GSP Greenville
ONTGSP
Ontario
Sat 11/7
5:00 am-8:58 pm
2 stops12h 58m
Greenville
Wed 12/31
12:00 am-9:00 pm
Nonstop0h 00m
$245
OntarioGreenville
ONT Ontario - GSP Greenville
ONTGSP
Ontario
Thu 10/22
6:20 am-9:47 pm
2 stops12h 27m
Greenville
Wed 12/31
12:00 am-9:00 pm
Nonstop0h 00m
$315
Quickest round-trip
OntarioGreenville
ONT Ontario - GSP Greenville
ONTGSP
Ontario
Thu 10/22
12:43 pm-10:05 pm
1 stop6h 22m
Greenville
Wed 12/31
12:00 am-9:00 pm
Nonstop0h 00m
$390
OntarioGreenville
ONT Ontario - GSP Greenville
ONTGSP
Ontario
Thu 10/15
12:16 pm-10:51 pm
1 stop7h 35m
Greenville
Wed 12/31
12:00 am-9:00 pm
Nonstop0h 00m
$390
OntarioGreenville
ONT Ontario - GSP Greenville
ONTGSP
Ontario
Thu 10/22
11:00 am-10:50 pm
2 stops8h 50m
Greenville
Sat 10/24
6:40 am-2:30 pm
1 stop10h 50m
$390
OntarioGreenville
ONT Ontario - GSP Greenville
ONTGSP
Ontario
Mon 9/28
5:00 am-3:08 pm
1 stop7h 08m
Greenville
Wed 12/31
12:00 am-9:00 pm
Nonstop0h 00m
$453
OntarioGreenville
ONT Ontario - GSP Greenville
ONTGSP
Ontario
Wed 12/9
10:05 am-8:45 pm
2 stops7h 40m
Greenville
Wed 12/16
2:50 pm-9:40 pm
2 stops9h 50m
$453
OntarioGreenville
ONT Ontario - GSP Greenville
ONTGSP
Ontario
Wed 11/11
7:50 am-8:45 pm
2 stops9h 55m
Greenville
Thu 11/12
6:40 am-2:05 pm
2 stops10h 25m
$453
OntarioGreenville
ONT Ontario - GSP Greenville
ONTGSP
Ontario
Sat 10/31
6:59 am-4:56 pm
1 stop6h 57m
Greenville
Tue 11/3
4:29 pm-8:51 pm
1 stop7h 22m
$479
Showing 1-10 of 14 resultsSorted by cheapest first
Compare providers for flights from Ontario to Greenville
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 Ontario to Greenville 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 Ontario-Greenville flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Ontario-Greenville flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Ontario-Greenville flight searches over the past month and is updated monthly.
- Most trusted provider: When it comes to deals on Ontario-Greenville 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 Ontario-Greenville 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 Ontario to Greenville
Have a flexible travel schedule? Discover the best time to fly to Greenville from Ontario with our price prediction graph.
ONT-GSP
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 Ontario to Greenville
Reviews of airlines servicing Greenville
Get insights into the airlines that provide service to Greenville. 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 Greenville. Reviews last updated September 8, 2026.
Peruse reviews from past customers who have flown with Southwest,Delta, andUnited Airlines from Ontario to Greenville 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.
Crew
8.6
Entertainment
7.5
Boarding
8.1
Comfort
8.0
Overall
8.0
Food
7.0
Reviews
1 / 20
8.0
ExcellentLa Tracimeldamarcos,Jun 2026
LAX - SLC
Crew
8.6
Entertainment
7.5
Boarding
8.1
Comfort
8.0
Overall
8.0
Food
7.0
Reviews
1 / 20
8.0
ExcellentLa Tracimeldamarcos,Jun 2026
LAX - SLC
Crew
8.6
Entertainment
7.5
Boarding
8.1
Comfort
8.0
Overall
8.0
Food
7.0
Reviews
1 / 20
8.0
ExcellentLa Tracimeldamarcos,Jun 2026
LAX - SLC
Crew
8.6
Entertainment
7.5
Boarding
8.1
Comfort
8.0
Overall
8.0
Food
7.0
Reviews
1 / 20
8.0
ExcellentLa Tracimeldamarcos,Jun 2026
LAX - SLC
Crew
8.6
Entertainment
7.5
Boarding
8.1
Comfort
8.0
Overall
8.0
Food
7.0
Reviews
1 / 20
8.0
ExcellentLa Tracimeldamarcos,Jun 2026
LAX - SLC
Related info for your journey
Find useful and relevant information for your journey from Ontario to Greenville. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
Traveling to a place near Greenville?
Book flights to Greenville if you plan to visit one of these locationsGreer
Simpsonville
Greenwood
Duncan
Anderson
Seneca
Browse thousands of different options on Cheapflights for your next trip
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Other flights to Greenville
Explore flights to Greenville departing from other origins. Flights are based on user searches made on Cheapflights and were last updated on September 8, 2026.
Ontario and Greenville flights
Browse other Ontario and Greenville flight options. Last updated on September 8, 2026.
Other flights from Ontario
Browse through other flights departing from Ontario. Flights are based on user searches made on Cheapflights and were last updated on September 8, 2026.
Popular flight searches
Check out other popular destinations found by fellow travelers in 2026
Top 4 airlines flying from Ontario to Greenville
Discover the top 4 airlines that operate flights from Ontario to Greenville. 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 8, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$228 | Average$446 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$273 | Average$616 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$336 | Average$576 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$423 | Average$657 | FlexibilityNo cancel fee | On-time63% |