$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 5/7. Fares are subject to change and may not be available on all flights or dates of travel.
GSP — ONT
Apr 27 — May 41
Round-trip
1 adult, Economy
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Find cheap flights from Greenville to Ontario with Cheapflights
1. Tell us where you want to go
Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”2. Select your favorite providers
We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.3. Compare prices and book
Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.Cheap flight deals from Greenville to Ontario
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Best
Last-minute
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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 March 28, 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 March 28, 2026.
This Delta deal was found by Cheapflights users on 3/25. 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 4/186:51 am
GSP
- ONT
1 stop7h 45m
Delta
Tue 4/2110:15 pm
ONT
- GSP
1 stop7h 54m
Delta
Deal found 3/25![Delta logo]()
$331
This Delta deal was found by Cheapflights users on 3/25. 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 4/145:42 am
GSP
- ONT
1 stop8h 54m
Delta
Tue 4/2812:49 pm
ONT
- GSP
1 stop8h 07m
Delta
Deal found 3/25![Delta logo]()
$335
This American Airlines deal was found by Cheapflights users on 3/24. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/215:12 pm
GSP
- ONT
1 stop8h 24m
American Airlines
Mon 4/2711:59 pm
ONT
- GSP
2 stops10h 15m
American Airlines
Deal found 3/24![American Airlines logo]()
$336
This Southwest deal was found by Cheapflights users on 3/25. 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 4/226:45 am
GSP
- ONT
2 stops8h 30m
Southwest
Mon 4/279:20 am
ONT
- GSP
2 stops9h 55m
Southwest
Deal found 3/25![Southwest logo]()
$341
This Delta deal was found by Cheapflights users on 3/25. 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 4/186:51 am
GSP
- ONT
1 stop7h 45m
Delta
Sat 4/2510:15 pm
ONT
- GSP
1 stop7h 54m
Delta
Deal found 3/25![Delta logo]()
$363
This Delta deal was found by Cheapflights users on 3/25. 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 4/146:51 am
GSP
- ONT
1 stop7h 45m
Delta
Mon 4/2710:15 pm
ONT
- GSP
1 stop7h 54m
Delta
Deal found 3/25![Delta logo]()
$367
This Delta deal was found by Cheapflights users on 3/26. 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 5/75:40 am
GSP
- ONT
1 stop8h 17m
Delta
Sat 5/95:45 pm
ONT
- GSP
2 stops14h 10m
Delta
Deal found 3/26![Delta logo]()
$368
This Delta deal was found by Cheapflights users on 3/25. 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 4/155:42 am
GSP
- ONT
1 stop8h 54m
Delta
Wed 4/2212:49 pm
ONT
- GSP
1 stop8h 07m
Delta
Deal found 3/25![Delta logo]()
$379
This American Airlines deal was found by Cheapflights users on 3/25. 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 4/225:12 pm
GSP
- ONT
1 stop8h 24m
American Airlines
Mon 4/2711:29 pm
ONT
- GSP
1 stop7h 22m
American Airlines
Deal found 3/25![American Airlines logo]()
$389
This Delta deal was found by Cheapflights users on 3/25. 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 4/145:42 am
GSP
- ONT
1 stop8h 54m
Delta
Fri 4/1710:15 pm
ONT
- GSP
1 stop7h 54m
Delta
Deal found 3/25![Delta logo]()
$398
This Southwest deal was found by Cheapflights users on 3/25. 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 6/512:55 pm
GSP
- ONT
1 stop6h 05m
Southwest
Mon 6/89:40 pm
ONT
- GSP
2 stops11h 35m
Southwest
Deal found 3/25![Southwest logo]()
$405
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 March 28, 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 March 28, 2026.
This Southwest deal was found by Cheapflights users on 3/25. 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 4/226:45 am
GSP
- ONT
2 stops8h 30m
Southwest
Mon 4/279:55 pm
ONT
- GSP
1 stop12h 15m
Southwest
Deal found 3/25![Southwest logo]()
$342
This Delta deal was found by Cheapflights users on 3/26. 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 4/153:03 pm
GSP
- ONT
1 stop8h 57m
Delta
Sun 4/1912:49 pm
ONT
- GSP
1 stop6h 24m
Delta
Deal found 3/26![Delta logo]()
$454
This United Airlines deal was found by Cheapflights users on 3/27. 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 5/65:45 pm
GSP
- ONT
1 stop7h 50m
United Airlines
Sat 5/96:00 am
ONT
- GSP
1 stop6h 54m
United Airlines
Deal found 3/27![United Airlines logo]()
$519
This Southwest deal was found by Cheapflights users on 3/25. 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 6/512:55 pm
GSP
- ONT
1 stop6h 05m
Southwest
Mon 6/89:40 pm
ONT
- GSP
2 stops11h 35m
Southwest
Deal found 3/25![Southwest logo]()
$405
This United Airlines deal was found by Cheapflights users on 3/23. 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.
Sat 4/255:41 pm
GSP
- ONT
1 stop7h 50m
United Airlines
Wed 4/296:49 pm
ONT
- GSP
2 stops11h 58m
United Airlines
Deal found 3/23![United Airlines logo]()
$560
This Delta deal was found by Cheapflights users on 3/25. 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 4/82:34 pm
GSP
- ONT
1 stop9h 26m
Delta
Sun 4/1912:49 pm
ONT
- GSP
1 stop8h 07m
Delta
Deal found 3/25![Delta logo]()
$562
This Southwest deal was found by Cheapflights users on 3/24. 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 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
Mon 6/229:40 pm
ONT
- GSP
2 stops11h 35m
Southwest
Deal found 3/24![Southwest logo]()
$555
Last-minute flights from Greenville to OntarioDiscover last-minute flight deals from Greenville to Ontario. Data last updated March 28, 2026 and is based on user searches.
Discover last-minute flight deals from Greenville to Ontario. Data last updated March 28, 2026 and is based on user searches.
This Delta deal was found by Cheapflights users on 3/25. 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 4/145:42 am
GSP
- ONT
1 stop8h 54m
Delta
Tue 4/2812:49 pm
ONT
- GSP
1 stop8h 07m
Delta
Deal found 3/25![Delta logo]()
$335
This Delta deal was found by Cheapflights users on 3/25. 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 4/146:51 am
GSP
- ONT
1 stop7h 45m
Delta
Mon 4/2710:15 pm
ONT
- GSP
1 stop7h 54m
Delta
Deal found 3/25![Delta logo]()
$367
This Delta deal was found by Cheapflights users on 3/25. 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 4/145:42 am
GSP
- ONT
1 stop8h 54m
Delta
Fri 4/1710:15 pm
ONT
- GSP
1 stop7h 54m
Delta
Deal found 3/25![Delta logo]()
$398
This Delta deal was found by Cheapflights users on 3/25. 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 4/155:42 am
GSP
- ONT
1 stop8h 54m
Delta
Wed 4/2212:49 pm
ONT
- GSP
1 stop8h 07m
Delta
Deal found 3/25![Delta logo]()
$379
This Delta deal was found by Cheapflights users on 3/25. 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 4/155:42 am
GSP
- ONT
1 stop8h 54m
Delta
Sat 4/1810:15 pm
ONT
- GSP
1 stop7h 54m
Delta
Deal found 3/25![Delta logo]()
$411
This Delta deal was found by Cheapflights users on 3/25. 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 4/186:51 am
GSP
- ONT
1 stop7h 45m
Delta
Tue 4/2110:15 pm
ONT
- GSP
1 stop7h 54m
Delta
Deal found 3/25![Delta logo]()
$331
This Delta deal was found by Cheapflights users on 3/25. 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 4/186:51 am
GSP
- ONT
1 stop7h 45m
Delta
Sat 4/2510:15 pm
ONT
- GSP
1 stop7h 54m
Delta
Deal found 3/25![Delta logo]()
$363
This American Airlines deal was found by Cheapflights users on 3/24. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/215:12 pm
GSP
- ONT
1 stop8h 24m
American Airlines
Mon 4/2711:59 pm
ONT
- GSP
2 stops10h 15m
American Airlines
Deal found 3/24![American Airlines logo]()
$336
This Southwest deal was found by Cheapflights users on 3/25. 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 4/226:45 am
GSP
- ONT
2 stops8h 30m
Southwest
Mon 4/279:20 am
ONT
- GSP
2 stops9h 55m
Southwest
Deal found 3/25![Southwest logo]()
$341
This American Airlines deal was found by Cheapflights users on 3/25. 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 4/225:12 pm
GSP
- ONT
1 stop8h 24m
American Airlines
Mon 4/2711:29 pm
ONT
- GSP
1 stop7h 22m
American Airlines
Deal found 3/25![American Airlines logo]()
$389
This American Airlines deal was found by Cheapflights users on 3/25. 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 4/235:12 pm
GSP
- ONT
1 stop8h 24m
American Airlines
Mon 4/2711:29 pm
ONT
- GSP
1 stop7h 22m
American Airlines
Deal found 3/25![American Airlines logo]()
$408
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 March 28, 2026.
Search for one-way flight options from Greenville to Ontario. Find affordable one-way fares based on user searches. Data last updated March 28, 2026.
This Delta deal was found by Cheapflights users on 3/26. 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 5/75:40 am
GSP
- ONT
1 stop8h 17m
Delta
Deal found 3/26![Delta logo]()
$182
This Delta deal was found by Cheapflights users on 3/25. 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 5/25:40 am
GSP
- ONT
2 stops9h 34m
Delta
Deal found 3/25![Delta logo]()
$187
This Kiwi.com deal was found by Cheapflights users on 3/26. 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.
Thu 5/72:18 pm
GSP
- ONT
3 stops53h 46m
Multiple Airlines
Deal found 3/26![Multiple Airlines logo]()
$207
This United Airlines deal was found by Cheapflights users on 3/24. 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 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 3/24![United Airlines logo]()
$237
This United Airlines deal was found by Cheapflights users on 3/26. 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 4/2512:22 pm
GSP
- ONT
2 stops11h 14m
United Airlines
Deal found 3/26![United Airlines logo]()
$242
This United Airlines deal was found by Cheapflights users on 3/28. 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 3/28![United Airlines logo]()
$260
This United Airlines deal was found by Cheapflights users on 3/26. 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 6/135:10 pm
GSP
- ONT
1 stop7h 45m
United Airlines
Deal found 3/26![United Airlines logo]()
$289
This Delta deal was found by Cheapflights users on 3/27. 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 5/225:40 am
GSP
- ONT
1 stop8h 17m
Delta
Deal found 3/27![Delta logo]()
$300
This United Airlines deal was found by Cheapflights users on 3/25. 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 5/134:35 pm
GSP
- ONT
1 stop7h 01m
United Airlines
Deal found 3/25![United Airlines logo]()
$319
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 March 28, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $331 (Delta) |
One-way from | $182 (Delta) |
Popular in | November |
Cheapest in | January |
Average price | $453 |
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 March 28, 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
Wed 4/22
6:45 am-12:15 pm
2 stops8h 30m
Ontario
Mon 4/27
9:55 pm-1:10 pm
1 stop12h 15m
$342
GreenvilleOntario
GSP - ONT
GSPONT
Greenville
Fri 6/5
12:55 pm-4:00 pm
1 stop6h 05m
Ontario
Mon 6/8
9:40 pm-12:15 pm
2 stops11h 35m
$405
GreenvilleOntario
GSP - ONT
GSPONT
Greenville
Wed 4/15
3:03 pm-9:00 pm
1 stop8h 57m
Ontario
Sun 4/19
12:49 pm-10:13 pm
1 stop6h 24m
$454
Quickest round-trip
GreenvilleOntario
GSP - ONT
GSPONT
Greenville
Wed 5/6
5:45 pm-10:35 pm
1 stop7h 50m
Ontario
Sat 5/9
6:00 am-3:54 pm
1 stop6h 54m
$519
GreenvilleOntario
GSP - ONT
GSPONT
Greenville
Tue 6/16
7:00 am-12:40 pm
2 stops8h 40m
Ontario
Mon 6/22
9:40 pm-12:15 pm
2 stops11h 35m
$555
GreenvilleOntario
GSP - ONT
GSPONT
Greenville
Sat 4/25
5:41 pm-10:31 pm
1 stop7h 50m
Ontario
Wed 4/29
6:49 pm-9:47 am
2 stops11h 58m
$560
GreenvilleOntario
GSP - ONT
GSPONT
Greenville
Wed 4/8
2:34 pm-9:00 pm
1 stop9h 26m
Ontario
Sun 4/19
12:49 pm-11:56 pm
1 stop8h 07m
$562
Cheapest one-way
GreenvilleOntario
GSP - ONT
GSPONT
Greenville
Sat 5/2
5:40 am-11:36 am
1 stop8h 56m
$182
GreenvilleOntario
GSP - ONT
GSPONT
Greenville
Thu 5/7
6:25 am-2:25 pm
2 stops11h 00m
$187
GreenvilleOntario
GSP - ONT
GSPONT
Greenville
Sat 5/23
4:15 pm-8:42 pm
1 stop7h 27m
$237
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 March.
| 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
What is the cheapest month to book a flight from Greenville to Ontario?
Currently, March is the cheapest month in which you can book a flight from Greenville to Ontario (average of $96). Flying from Greenville to Ontario in February is currently the most expensive (average of $246). 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 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 March 28, 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.
Overall
7.9
Comfort
7.9
Crew
8.5
Entertainment
7.8
Food
7.2
Boarding
8.1
Reviews
1 / 20
8.0
ExcellentMatthew,Oct 2025
GSP - ATL
Overall
7.9
Comfort
7.9
Crew
8.5
Entertainment
7.8
Food
7.2
Boarding
8.1
Reviews
1 / 20
8.0
ExcellentMatthew,Oct 2025
GSP - ATL
Overall
7.9
Comfort
7.9
Crew
8.5
Entertainment
7.8
Food
7.2
Boarding
8.1
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 March 28, 2026.
Greenville and Ontario flights
Browse other Greenville and Ontario flight options. Last updated on March 28, 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 March 28, 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 March 28, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$312 | Average$422 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$351 | Average$432 | FlexibilityNo cancel fee | On-timeN/A |