$182+ 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 12/4. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — GSP
Nov 23 — Nov 301
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 October 24, 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 October 24, 2026.
This American Airlines deal was found by Cheapflights users on 10/21. 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 11/1412:42 pm -
1 stop6h 16m
Mon 11/235:17 pm -
1 stop9h 42m
Deal found 10/21![American Airlines logo]()
$384
This American Airlines deal was found by Cheapflights users on 10/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/187:00 am -
1 stop6h 27m
Mon 11/235:17 pm -
1 stop8h 19m
Deal found 10/20![American Airlines logo]()
$405
This Southwest deal was found by Cheapflights users on 10/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/1710:05 am -
2 stops7h 45m
Sat 11/214:55 pm -
2 stops9h 20m
Deal found 10/19![Southwest logo]()
$417
This Delta deal was found by Cheapflights users on 10/24. 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 12/1011:08 pm -
1 stop9h 05m
Sun 12/137:00 am -
1 stop7h 07m
Deal found 10/24![Delta logo]()
$429
This United Airlines deal was found by Cheapflights users on 10/20. 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 11/147:00 am -
1 stop6h 56m
Wed 11/185:12 pm -
1 stop7h 28m
Deal found 10/20![United Airlines logo]()
$447
This United Airlines deal was found by Cheapflights users on 10/20. 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 11/185:00 am -
1 stop7h 03m
Mon 11/236:20 am -
2 stops14h 36m
Deal found 10/20![United Airlines logo]()
$473
This Delta deal was found by Cheapflights users on 10/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/267:05 am -
1 stop6h 06m
Mon 11/305:40 am -
1 stop8h 23m
Deal found 10/19![Delta logo]()
$478
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 October 24, 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 October 24, 2026.
This United Airlines deal was found by Cheapflights users on 10/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/146:00 am -
1 stop6h 14m
Wed 11/184:29 pm -
1 stop7h 22m
Deal found 10/19![United Airlines logo]()
$447
This United Airlines deal was found by Cheapflights users on 10/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 1/66:00 am -
1 stop7h 18m
Wed 1/136:30 am -
2 stops14h 05m
Deal found 10/19![United Airlines logo]()
$473
This United Airlines deal was found by Cheapflights users on 10/20. 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 11/185:00 am -
1 stop7h 03m
Mon 11/236:20 am -
2 stops14h 36m
Deal found 10/20![United Airlines logo]()
$473
This United Airlines deal was found by Cheapflights users on 10/21. 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 11/146:00 am -
2 stops11h 58m
Mon 11/2310:42 am -
2 stops13h 09m
Deal found 10/21![United Airlines logo]()
$524
Last-minute flights from Ontario to GreenvilleDiscover last-minute flight deals from Ontario to Greenville. Data last updated October 24, 2026 and is based on user searches.
Discover last-minute flight deals from Ontario to Greenville. Data last updated October 24, 2026 and is based on user searches.
This American Airlines deal was found by Cheapflights users on 10/21. 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 11/1412:42 pm -
1 stop6h 16m
Mon 11/235:17 pm -
1 stop9h 42m
Deal found 10/21![American Airlines logo]()
$384
This United Airlines deal was found by Cheapflights users on 10/20. 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 11/147:00 am -
1 stop6h 56m
Wed 11/185:12 pm -
1 stop7h 28m
Deal found 10/20![United Airlines logo]()
$447
This Southwest deal was found by Cheapflights users on 10/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/1710:05 am -
2 stops7h 45m
Sat 11/214:55 pm -
2 stops9h 20m
Deal found 10/19![Southwest logo]()
$417
This American Airlines deal was found by Cheapflights users on 10/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/187:00 am -
1 stop6h 27m
Mon 11/235:17 pm -
1 stop8h 19m
Deal found 10/20![American Airlines logo]()
$405
This United Airlines deal was found by Cheapflights users on 10/20. 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 11/185:00 am -
1 stop7h 03m
Mon 11/236:20 am -
2 stops14h 36m
Deal found 10/20![United Airlines logo]()
$473
This Delta deal was found by Cheapflights users on 10/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/267:05 am -
1 stop6h 06m
Mon 11/305:40 am -
1 stop8h 23m
Deal found 10/19![Delta logo]()
$478
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 October 24, 2026.
Search for one-way flight options from Ontario to Greenville. Find affordable one-way fares based on user searches. Data last updated October 24, 2026.
This Southwest deal was found by Cheapflights users on 10/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/48:40 am -
2 stops9h 10m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/19![Southwest logo]()
$182
This Delta deal was found by Cheapflights users on 10/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/411:08 pm -
1 stop8h 08m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/19![Delta logo]()
$204
This Kiwi.com deal was found by Cheapflights users on 10/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/42:00 pm -
3 stops40h 32m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/19![Multiple Airlines logo]()
$235
This United Airlines deal was found by Cheapflights users on 10/21. 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.
Mon 11/166:00 am -
1 stop7h 10m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/21![United Airlines logo]()
$291
This Kiwi.com deal was found by Cheapflights users on 10/23. 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 11/277:30 am -
2 stops21h 24m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/23![Multiple Airlines logo]()
$306
This United Airlines deal was found by Cheapflights users on 10/23. 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 12/2411:52 pm -
1 stop6h 36m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/23![United Airlines logo]()
$314
This Delta deal was found by Cheapflights users on 10/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/47:07 am -
1 stop8h 02m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/19![Delta logo]()
$319
This United Airlines deal was found by Cheapflights users on 10/22. 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 11/205:00 am -
1 stop7h 03m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/22![United Airlines logo]()
$342
This Alaska Airlines deal was found by Cheapflights users on 10/21. 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.
Mon 11/167:13 pm -
2 stops12h 54m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/21![Alaska Airlines logo]()
$354
This United Airlines deal was found by Cheapflights users on 10/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/35:00 am -
1 stop7h 03m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/19![United Airlines logo]()
$384
This American Airlines deal was found by Cheapflights users on 10/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/36:30 am -
2 stops12h 28m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/19![American Airlines logo]()
$389
This United Airlines deal was found by Cheapflights users on 10/21. 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.
Sun 11/225:00 am -
2 stops12h 58m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/21![United Airlines logo]()
$390
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 October 24, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $317 (American Airlines) |
One-way from | $182 (Southwest) |
Popular in | September |
Cheapest in | April |
Average price | $544 |
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 October 24, 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
Fri 12/4
8:40 am-8:50 pm
2 stops9h 10m
Greenville
Wed 12/31
12:00 am-9:00 pm
Nonstop0h 00m
$182
OntarioGreenville
ONT Ontario - GSP Greenville
ONTGSP
Ontario
Fri 11/27
7:30 am-7:54 am
2 stops21h 24m
Greenville
Wed 12/31
12:00 am-9:00 pm
Nonstop0h 00m
$306
Quickest round-trip
OntarioGreenville
ONT Ontario - GSP Greenville
ONTGSP
Ontario
Thu 12/24
11:52 pm-9:28 am
1 stop6h 36m
Greenville
Wed 12/31
12:00 am-9:00 pm
Nonstop0h 00m
$314
OntarioGreenville
ONT Ontario - GSP Greenville
ONTGSP
Ontario
Fri 11/20
5:00 am-3:03 pm
1 stop7h 03m
Greenville
Wed 12/31
12:00 am-9:00 pm
Nonstop0h 00m
$342
OntarioGreenville
ONT Ontario - GSP Greenville
ONTGSP
Ontario
Tue 11/3
5:00 am-3:03 pm
1 stop7h 03m
Greenville
Wed 12/31
12:00 am-9:00 pm
Nonstop0h 00m
$384
OntarioGreenville
ONT Ontario - GSP Greenville
ONTGSP
Ontario
Thu 11/5
5:00 am-3:02 pm
1 stop7h 02m
Greenville
Wed 12/31
12:00 am-9:00 pm
Nonstop0h 00m
$384
OntarioGreenville
ONT Ontario - GSP Greenville
ONTGSP
Ontario
Thu 11/5
9:29 am-10:14 pm
2 stops9h 45m
Greenville
Wed 12/31
12:00 am-9:00 pm
Nonstop0h 00m
$389
OntarioGreenville
ONT Ontario - GSP Greenville
ONTGSP
Ontario
Mon 11/9
7:13 pm-11:07 am
2 stops12h 54m
Greenville
Wed 12/31
12:00 am-9:00 pm
Nonstop0h 00m
$389
OntarioGreenville
ONT Ontario - GSP Greenville
ONTGSP
Ontario
Wed 11/4
9:50 am-10:54 pm
2 stops10h 04m
Greenville
Wed 12/31
12:00 am-9:00 pm
Nonstop0h 00m
$389
OntarioGreenville
ONT Ontario - GSP Greenville
ONTGSP
Ontario
Sun 11/22
5:00 am-8:58 pm
2 stops12h 58m
Greenville
Wed 12/31
12:00 am-9:00 pm
Nonstop0h 00m
$390
Showing 1-10 of 16 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 October.
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy1 star | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars |
- Most accurate provider: When it comes to deals on 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
What is the cheapest month to book a flight from Ontario to Greenville?
Currently, April is the cheapest month in which you can book a flight from Ontario to Greenville (average of $423). Flying from Ontario to Greenville in September is currently the most expensive (average of $1,397). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.
How much does it cost to fly round-trip from Ontario to Greenville?
Airfare is below average for this route at the moment.
Ontario to Greenville flights typically cost between $494 and $625 in January.The cheapest round-trip price found within the last 5 days was $317 on American Airlines (Jan 7-Jan 19).
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 October 24, 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.
Boarding
8.1
Entertainment
7.4
Crew
8.6
Comfort
8.0
Overall
7.9
Food
7.0
Reviews
1 / 20
8.0
ExcellentLa Tracimeldamarcos,Jun 2026
LAX - SLC
Boarding
8.1
Entertainment
7.4
Crew
8.6
Comfort
8.0
Overall
7.9
Food
7.0
Reviews
1 / 20
8.0
ExcellentLa Tracimeldamarcos,Jun 2026
LAX - SLC
Boarding
8.1
Entertainment
7.4
Crew
8.6
Comfort
8.0
Overall
7.9
Food
7.0
Reviews
1 / 20
8.0
ExcellentLa Tracimeldamarcos,Jun 2026
LAX - SLC
Boarding
8.1
Entertainment
7.4
Crew
8.6
Comfort
8.0
Overall
7.9
Food
7.0
Reviews
1 / 20
8.0
ExcellentLa Tracimeldamarcos,Jun 2026
LAX - SLC
Boarding
8.1
Entertainment
7.4
Crew
8.6
Comfort
8.0
Overall
7.9
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 October 24, 2026.
Ontario and Greenville flights
Browse other Ontario and Greenville flight options. Last updated on October 24, 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 October 24, 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 October 24, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$228 | Average$446 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$273 | Average$584 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$336 | Average$669 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$423 | Average$657 | FlexibilityNo cancel fee | On-time63% |