$202+ 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 7/21. Fares are subject to change and may not be available on all flights or dates of travel.
GSP — ONT
Jun 15 — Jun 221
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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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 May 16, 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 May 16, 2026.
This Delta deal was found by Cheapflights users on 5/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/85:45 am
GSP
- ONT
1 stop8h 19m
Delta
Tue 9/1510:59 pm
ONT
- GSP
1 stop8h 59m
Delta
Deal found 5/12![Delta logo]()
$403
This American Airlines deal was found by Cheapflights users on 5/14. 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 7/158:01 pm
GSP
- ONT
1 stop6h 58m
American Airlines
Sat 7/2512:35 pm
ONT
- GSP
1 stop7h 42m
American Airlines
Deal found 5/14![American Airlines logo]()
$423
This Delta deal was found by Cheapflights users on 5/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/283:42 pm
GSP
- ONT
1 stop9h 14m
Delta
Tue 10/610:59 pm
ONT
- GSP
1 stop7h 26m
Delta
Deal found 5/12![Delta logo]()
$428
This Delta deal was found by Cheapflights users on 5/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/85:45 am
GSP
- ONT
1 stop8h 19m
Delta
Sun 9/1310:59 pm
ONT
- GSP
1 stop8h 59m
Delta
Deal found 5/12![Delta logo]()
$435
This Delta deal was found by Cheapflights users on 5/11. 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 6/155:44 am
GSP
- ONT
1 stop7h 56m
Delta
Mon 6/2210:00 pm
ONT
- GSP
1 stop8h 18m
Delta
Deal found 5/11![Delta logo]()
$443
This Delta deal was found by Cheapflights users on 5/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/56:45 am
GSP
- ONT
1 stop7h 19m
Delta
Sun 9/1310:59 pm
ONT
- GSP
1 stop8h 59m
Delta
Deal found 5/12![Delta logo]()
$460
This American Airlines deal was found by Cheapflights users on 5/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 6/85:25 pm
GSP
- ONT
1 stop8h 14m
American Airlines
Tue 6/165:45 am
ONT
- GSP
1 stop7h 47m
American Airlines
Deal found 5/12![American Airlines logo]()
$465
This Delta deal was found by Cheapflights users on 5/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/13:42 pm
GSP
- ONT
1 stop9h 14m
Delta
Sun 10/410:59 pm
ONT
- GSP
1 stop8h 59m
Delta
Deal found 5/12![Delta logo]()
$467
This American Airlines deal was found by Cheapflights users on 5/11. 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 6/35:25 pm
GSP
- ONT
1 stop8h 13m
American Airlines
Wed 6/1012:40 pm
ONT
- GSP
1 stop7h 16m
American Airlines
Deal found 5/11![American Airlines logo]()
$468
This Delta deal was found by Cheapflights users on 5/15. 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.
Wed 6/36:00 am
GSP
- ONT
2 stops15h 36m
Delta
Mon 6/2210:00 pm
ONT
- GSP
1 stop8h 18m
Delta
Deal found 5/15![Delta logo]()
$501
This Delta deal was found by Cheapflights users on 5/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/296:45 am
GSP
- ONT
1 stop7h 12m
Delta
Fri 6/510:00 pm
ONT
- GSP
1 stop8h 09m
Delta
Deal found 5/14![Delta logo]()
$502
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 May 16, 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 May 16, 2026.
This United Airlines deal was found by Cheapflights users on 5/11. 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 7/185:10 pm
GSP
- ONT
1 stop7h 45m
United Airlines
Wed 7/225:00 am
ONT
- GSP
1 stop7h 19m
United Airlines
Deal found 5/11![United Airlines logo]()
$580
This Southwest deal was found by Cheapflights users on 5/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 6/87:05 am
GSP
- ONT
2 stops8h 05m
Southwest
Tue 6/169:45 am
ONT
- GSP
2 stops9h 15m
Southwest
Deal found 5/12![Southwest logo]()
$596
This Alaska Airlines deal was found by Cheapflights users on 5/11. 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.
Tue 8/1111:31 am
GSP
- ONT
2 stops14h 40m
Alaska Airlines
Tue 9/297:57 pm
ONT
- GSP
2 stops11h 52m
Alaska Airlines
Deal found 5/11![Alaska Airlines logo]()
$746
This United Airlines deal was found by Cheapflights users on 5/11. 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 8/116:30 am
GSP
- ONT
2 stops14h 41m
United Airlines
Wed 8/125:00 am
ONT
- GSP
1 stop7h 15m
United Airlines
Deal found 5/11![United Airlines logo]()
$583
This United Airlines deal was found by Cheapflights users on 5/14. 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.
Mon 6/85:43 pm
GSP
- ONT
1 stop8h 08m
United Airlines
Thu 6/115:00 am
ONT
- GSP
1 stop7h 19m
United Airlines
Deal found 5/14![United Airlines logo]()
$643
This Alaska Airlines deal was found by Cheapflights users on 5/13. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/297:20 am
GSP
- ONT
2 stops14h 27m
Alaska Airlines
Mon 6/18:11 pm
ONT
- GSP
2 stops11h 52m
Alaska Airlines
Deal found 5/13![Alaska Airlines logo]()
$821
This United Airlines deal was found by Cheapflights users on 5/13. 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.
Fri 5/295:41 pm
GSP
- ONT
1 stop8h 10m
United Airlines
Mon 6/15:00 am
ONT
- GSP
1 stop7h 19m
United Airlines
Deal found 5/13![United Airlines logo]()
$683
This United Airlines deal was found by Cheapflights users on 5/15. 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 6/34:15 pm
GSP
- ONT
1 stop7h 31m
United Airlines
Sun 6/215:00 am
ONT
- GSP
1 stop7h 19m
United Airlines
Deal found 5/15![United Airlines logo]()
$786
Last-minute flights from Greenville to OntarioDiscover last-minute flight deals from Greenville to Ontario. Data last updated May 16, 2026 and is based on user searches.
Discover last-minute flight deals from Greenville to Ontario. Data last updated May 16, 2026 and is based on user searches.
This Delta deal was found by Cheapflights users on 5/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/296:45 am
GSP
- ONT
1 stop7h 12m
Delta
Fri 6/510:00 pm
ONT
- GSP
1 stop8h 09m
Delta
Deal found 5/14![Delta logo]()
$502
This United Airlines deal was found by Cheapflights users on 5/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/25:43 pm
GSP
- ONT
1 stop8h 08m
United Airlines
Wed 6/35:00 am
ONT
- GSP
1 stop7h 19m
United Airlines
Deal found 5/12![United Airlines logo]()
$513
This American Airlines deal was found by Cheapflights users on 5/11. 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 6/35:25 pm
GSP
- ONT
1 stop8h 13m
American Airlines
Wed 6/1012:40 pm
ONT
- GSP
1 stop7h 16m
American Airlines
Deal found 5/11![American Airlines logo]()
$468
This Delta deal was found by Cheapflights users on 5/15. 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.
Wed 6/36:00 am
GSP
- ONT
2 stops15h 36m
Delta
Mon 6/2210:00 pm
ONT
- GSP
1 stop8h 18m
Delta
Deal found 5/15![Delta logo]()
$501
This Delta deal was found by Cheapflights users on 5/11. 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 6/31:09 pm
GSP
- ONT
2 stops13h 25m
Delta
Wed 6/105:59 pm
ONT
- GSP
2 stops12h 19m
Delta
Deal found 5/11![Delta logo]()
$521
This American Airlines deal was found by Cheapflights users on 5/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 6/85:25 pm
GSP
- ONT
1 stop8h 14m
American Airlines
Tue 6/165:45 am
ONT
- GSP
1 stop7h 47m
American Airlines
Deal found 5/12![American Airlines logo]()
$465
This Delta deal was found by Cheapflights users on 5/11. 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 6/145:16 pm
GSP
- ONT
1 stop7h 32m
Delta
Mon 6/2210:00 pm
ONT
- GSP
1 stop8h 18m
Delta
Deal found 5/11![Delta logo]()
$510
This Delta deal was found by Cheapflights users on 5/11. 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 6/155:44 am
GSP
- ONT
1 stop7h 56m
Delta
Mon 6/2210:00 pm
ONT
- GSP
1 stop8h 18m
Delta
Deal found 5/11![Delta logo]()
$443
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 May 16, 2026.
Search for one-way flight options from Greenville to Ontario. Find affordable one-way fares based on user searches. Data last updated May 16, 2026.
This Delta deal was found by Cheapflights users on 5/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/215:16 pm
GSP
- ONT
1 stop7h 34m
Delta
Deal found 5/12![Delta logo]()
$202
This Delta deal was found by Cheapflights users on 5/15. 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.
Wed 5/273:00 pm
GSP
- ONT
1 stop6h 36m
Delta
Deal found 5/15![Delta logo]()
$234
This Southwest deal was found by Cheapflights users on 5/15. 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.
Wed 5/276:45 am
GSP
- ONT
2 stops8h 30m
Southwest
Deal found 5/15![Southwest logo]()
$239
This United Airlines deal was found by Cheapflights users on 5/13. 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.
Wed 6/104:15 pm
GSP
- ONT
1 stop7h 31m
United Airlines
Deal found 5/13![United Airlines logo]()
$257
This Southwest deal was found by Cheapflights users on 5/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/77:00 am
GSP
- ONT
2 stops10h 05m
Southwest
Deal found 5/13![Southwest logo]()
$260
This Delta deal was found by Cheapflights users on 5/13. 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 7/75:44 am
GSP
- ONT
1 stop7h 54m
Delta
Deal found 5/13![Delta logo]()
$280
This United Airlines deal was found by Cheapflights users on 5/12. 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.
Thu 5/285:10 pm
GSP
- ONT
1 stop7h 45m
United Airlines
Deal found 5/12![United Airlines logo]()
$289
This Kiwi.com deal was found by Cheapflights users on 5/13. 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.
Tue 7/711:07 am
GSP
- ONT
3 stops49h 56m
Multiple Airlines
Deal found 5/13![Multiple Airlines logo]()
$311
This United Airlines deal was found by Cheapflights users on 5/12. 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 5/305:41 pm
GSP
- ONT
1 stop8h 10m
United Airlines
Deal found 5/12![United Airlines logo]()
$349
This Alaska Airlines deal was found by Cheapflights users on 5/12. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/287:20 am
GSP
- ONT
2 stops14h 27m
Alaska Airlines
Deal found 5/12![Alaska Airlines logo]()
$379
This United Airlines deal was found by Cheapflights users on 5/11. 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 6/84:15 pm
GSP
- ONT
1 stop7h 31m
United Airlines
Deal found 5/11![United Airlines logo]()
$395
This Alaska Airlines deal was found by Cheapflights users on 5/12. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/307:20 am
GSP
- ONT
2 stops14h 42m
Alaska Airlines
Deal found 5/12![Alaska Airlines logo]()
$443
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 May 16, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $403 (Delta) |
One-way from | $202 (Delta) |
Popular in | April |
Cheapest in | January |
Average price | $557 |
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 May 16, 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
Sat 7/18
5:10 pm-9:55 pm
1 stop7h 45m
Ontario
Wed 7/22
5:00 am-3:19 pm
1 stop7h 19m
$580
GreenvilleOntario
GSP - ONT
GSPONT
Greenville
Tue 8/11
6:30 am-6:11 pm
2 stops14h 41m
Ontario
Wed 8/12
5:00 am-3:15 pm
1 stop7h 15m
$583
GreenvilleOntario
GSP - ONT
GSPONT
Greenville
Mon 6/8
7:05 am-12:10 pm
2 stops8h 05m
Ontario
Tue 6/16
9:45 am-10:00 pm
2 stops9h 15m
$596
GreenvilleOntario
GSP - ONT
GSPONT
Greenville
Mon 6/8
5:43 pm-10:51 pm
1 stop8h 08m
Ontario
Thu 6/11
5:00 am-3:19 pm
1 stop7h 19m
$643
GreenvilleOntario
GSP - ONT
GSPONT
Greenville
Fri 5/29
5:41 pm-10:51 pm
1 stop8h 10m
Ontario
Mon 6/1
5:00 am-3:19 pm
1 stop7h 19m
$683
GreenvilleOntario
GSP - ONT
GSPONT
Greenville
Tue 8/11
11:31 am-11:11 pm
2 stops14h 40m
Ontario
Tue 9/29
7:57 pm-10:49 am
2 stops11h 52m
$746
Quickest round-trip
GreenvilleOntario
GSP - ONT
GSPONT
Greenville
Wed 6/3
4:15 pm-8:46 pm
1 stop7h 31m
Ontario
Sun 6/21
5:00 am-3:19 pm
1 stop7h 19m
$786
GreenvilleOntario
GSP - ONT
GSPONT
Greenville
Fri 5/29
7:20 am-6:47 pm
2 stops14h 27m
Ontario
Mon 6/1
8:11 pm-11:03 am
2 stops11h 52m
$821
Cheapest one-way
GreenvilleOntario
GSP - ONT
GSPONT
Greenville
Tue 7/21
5:16 pm-9:50 pm
1 stop7h 34m
$202
Quickest one-way
GreenvilleOntario
GSP - ONT
GSPONT
Greenville
Wed 5/27
7:54 pm-11:59 pm
1 stop7h 05m
$234
Showing 1-10 of 19 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 May.
| 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 May 16, 2026.
Peruse reviews from past customers who have flown with Delta and American Airlines from Greenville to Ontario to help guide your decision. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Boarding
8.1
Entertainment
7.8
Crew
8.5
Overall
7.9
Comfort
7.8
Food
7.2
Reviews
1 / 20
8.0
ExcellentMatthew,Oct 2025
GSP - ATL
Boarding
8.1
Entertainment
7.8
Crew
8.5
Overall
7.9
Comfort
7.8
Food
7.2
Reviews
1 / 20
8.0
ExcellentMatthew,Oct 2025
GSP - ATL
Boarding
8.1
Entertainment
7.8
Crew
8.5
Overall
7.9
Comfort
7.8
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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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 May 16, 2026.
Greenville and Ontario flights
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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 May 16, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$351 | Average$434 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$368 | Average$480 | FlexibilityNo cancel fee | On-time71% |