$184+ 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 5/28. Fares are subject to change and may not be available on all flights or dates of travel.
GSP — ONT
May 9 — May 161
Round-trip
1 adult, Economy
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Find cheap flights from Greenville to Ontario with Cheapflights
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Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”2. Select your favorite providers
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Cheapest flights from Greenville to OntarioExplore the most affordable flight options available from Greenville to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on April 9, 2026.
Explore the most affordable flight options available from Greenville to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on April 9, 2026.
This Delta deal was found by Cheapflights users on 4/8. 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 4/295:42 am
GSP
- ONT
1 stop8h 54m
Delta
Tue 5/1910:00 pm
ONT
- GSP
1 stop8h 04m
Delta
Deal found 4/8![Delta logo]()
$383
This United Airlines deal was found by Cheapflights users on 4/9. 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 6/105:41 pm
GSP
- ONT
1 stop8h 05m
United Airlines
Tue 6/166:30 pm
ONT
- GSP
2 stops12h 25m
United Airlines
Deal found 4/9![United Airlines logo]()
$388
This Southwest deal was found by Cheapflights users on 4/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/121:55 pm
GSP
- ONT
2 stops10h 55m
Southwest
Tue 8/118:25 am
ONT
- GSP
2 stops9h 30m
Southwest
Deal found 4/9![Southwest logo]()
$393
This Delta deal was found by Cheapflights users on 4/9. 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 4/305:42 am
GSP
- ONT
1 stop8h 54m
Delta
Wed 5/610:15 pm
ONT
- GSP
1 stop7h 49m
Delta
Deal found 4/9![Delta logo]()
$396
This Delta deal was found by Cheapflights users on 4/5. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/165:40 am
GSP
- ONT
1 stop8h 17m
Delta
Tue 5/199:50 am
ONT
- GSP
2 stops10h 53m
Delta
Deal found 4/5![Delta logo]()
$401
This Delta deal was found by Cheapflights users on 4/5. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/165:40 am
GSP
- ONT
1 stop8h 17m
Delta
Sat 5/1610:00 pm
ONT
- GSP
1 stop8h 04m
Delta
Deal found 4/5![Delta logo]()
$409
This Delta deal was found by Cheapflights users on 4/9. 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 4/306:51 am
GSP
- ONT
1 stop7h 45m
Delta
Mon 5/45:55 pm
ONT
- GSP
2 stops12h 14m
Delta
Deal found 4/9![Delta logo]()
$414
This Southwest deal was found by Cheapflights users on 4/7. 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.
Thu 6/412:55 pm
GSP
- ONT
1 stop6h 05m
Southwest
Mon 6/89:40 pm
ONT
- GSP
2 stops11h 35m
Southwest
Deal found 4/7![Southwest logo]()
$420
This Delta deal was found by Cheapflights users on 4/8. 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 4/296:51 am
GSP
- ONT
1 stop7h 45m
Delta
Mon 5/1810:00 pm
ONT
- GSP
1 stop8h 04m
Delta
Deal found 4/8![Delta logo]()
$421
This American Airlines deal was found by Cheapflights users on 4/7. 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.
Thu 6/47:54 pm
GSP
- ONT
1 stop7h 05m
American Airlines
Mon 6/810:00 pm
ONT
- GSP
1 stop9h 08m
American Airlines
Deal found 4/7![American Airlines logo]()
$434
This Delta deal was found by Cheapflights users on 4/8. 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 4/296:51 am
GSP
- ONT
1 stop7h 45m
Delta
Fri 5/2210:00 pm
ONT
- GSP
1 stop8h 07m
Delta
Deal found 4/8![Delta logo]()
$435
Best flights from Greenville to OntarioDiscover carefully curated flight deals from Greenville to Ontario that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated April 9, 2026.
Discover carefully curated flight deals from Greenville to Ontario that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated April 9, 2026.
This United Airlines deal was found by Cheapflights users on 4/9. 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 6/105:41 pm
GSP
- ONT
1 stop8h 05m
United Airlines
Tue 6/166:30 pm
ONT
- GSP
2 stops12h 25m
United Airlines
Deal found 4/9![United Airlines logo]()
$388
This Southwest deal was found by Cheapflights users on 4/7. 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.
Fri 6/512:55 pm
GSP
- ONT
2 stops11h 10m
Southwest
Mon 6/89:40 pm
ONT
- GSP
2 stops11h 35m
Southwest
Deal found 4/7![Southwest logo]()
$454
This Delta deal was found by Cheapflights users on 4/5. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/295:42 am
GSP
- ONT
2 stops9h 32m
Delta
Fri 5/110:15 pm
ONT
- GSP
1 stop7h 54m
Delta
Deal found 4/5![Delta logo]()
$465
This Southwest deal was found by Cheapflights users on 4/8. 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 5/812:35 pm
GSP
- ONT
2 stops11h 10m
Southwest
Fri 5/159:55 pm
ONT
- GSP
1 stop9h 15m
Southwest
Deal found 4/8![Southwest logo]()
$472
This Delta deal was found by Cheapflights users on 4/6. 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 7/105:16 pm
GSP
- ONT
1 stop7h 28m
Delta
Mon 7/135:16 pm
ONT
- GSP
2 stops12h 57m
Delta
Deal found 4/6![Delta logo]()
$558
This United Airlines deal was found by Cheapflights users on 4/7. 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.
Tue 4/285:41 pm
GSP
- ONT
1 stop7h 50m
United Airlines
Wed 4/291:27 pm
ONT
- GSP
2 stops17h 20m
United Airlines
Deal found 4/7![United Airlines logo]()
$597
This Southwest deal was found by Cheapflights users on 4/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 6/1012:50 pm
GSP
- ONT
2 stops10h 30m
Southwest
Tue 6/1610:10 am
ONT
- GSP
2 stops8h 50m
Southwest
Deal found 4/9![Southwest logo]()
$549
This Delta deal was found by Cheapflights users on 4/8. 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 4/235:42 am
GSP
- ONT
1 stop8h 54m
Delta
Mon 4/2710:15 pm
ONT
- GSP
1 stop7h 54m
Delta
Deal found 4/8![Delta logo]()
$607
This Southwest deal was found by Cheapflights users on 4/9. 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 4/221:55 pm
GSP
- ONT
2 stops10h 55m
Southwest
Mon 4/2711:55 pm
ONT
- GSP
2 stops10h 15m
Southwest
Deal found 4/9![Southwest logo]()
$597
This Southwest deal was found by Cheapflights users on 4/6. 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.
Tue 4/2112:50 pm
GSP
- ONT
2 stops9h 45m
Southwest
Sat 4/256:20 am
ONT
- GSP
2 stops11h 20m
Southwest
Deal found 4/6![Southwest logo]()
$597
Last-minute flights from Greenville to OntarioDiscover last-minute flight deals from Greenville to Ontario. Data last updated April 9, 2026 and is based on user searches.
Discover last-minute flight deals from Greenville to Ontario. Data last updated April 9, 2026 and is based on user searches.
This Delta deal was found by Cheapflights users on 4/8. 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 4/295:42 am
GSP
- ONT
1 stop8h 54m
Delta
Tue 5/1910:00 pm
ONT
- GSP
1 stop8h 04m
Delta
Deal found 4/8![Delta logo]()
$383
This Delta deal was found by Cheapflights users on 4/8. 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 4/296:51 am
GSP
- ONT
1 stop7h 45m
Delta
Mon 5/1810:00 pm
ONT
- GSP
1 stop8h 04m
Delta
Deal found 4/8![Delta logo]()
$421
This Delta deal was found by Cheapflights users on 4/8. 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 4/296:51 am
GSP
- ONT
1 stop7h 45m
Delta
Fri 5/2210:00 pm
ONT
- GSP
1 stop8h 07m
Delta
Deal found 4/8![Delta logo]()
$435
This Delta deal was found by Cheapflights users on 4/9. 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 4/306:51 am
GSP
- ONT
1 stop7h 45m
Delta
Tue 5/510:15 pm
ONT
- GSP
1 stop7h 54m
Delta
Deal found 4/9![Delta logo]()
$396
This Delta deal was found by Cheapflights users on 4/9. 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 4/306:51 am
GSP
- ONT
1 stop7h 45m
Delta
Mon 5/45:55 pm
ONT
- GSP
2 stops12h 14m
Delta
Deal found 4/9![Delta logo]()
$414
This Southwest deal was found by Cheapflights users on 4/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/121:55 pm
GSP
- ONT
2 stops10h 55m
Southwest
Tue 8/117:40 am
ONT
- GSP
1 stop6h 05m
Southwest
Deal found 4/9![Southwest logo]()
$388
This Delta deal was found by Cheapflights users on 4/5. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/136:00 am
GSP
- ONT
2 stops18h 48m
Delta
Tue 5/1910:00 pm
ONT
- GSP
1 stop8h 04m
Delta
Deal found 4/5![Delta logo]()
$451
This Delta deal was found by Cheapflights users on 4/5. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/165:40 am
GSP
- ONT
1 stop8h 17m
Delta
Tue 5/199:50 am
ONT
- GSP
2 stops10h 53m
Delta
Deal found 4/5![Delta logo]()
$401
This Delta deal was found by Cheapflights users on 4/5. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/165:40 am
GSP
- ONT
1 stop8h 17m
Delta
Sat 5/2310:00 pm
ONT
- GSP
1 stop8h 02m
Delta
Deal found 4/5![Delta logo]()
$409
This Delta deal was found by Cheapflights users on 4/5. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/165:40 am
GSP
- ONT
1 stop8h 17m
Delta
Thu 5/2110:00 pm
ONT
- GSP
1 stop8h 04m
Delta
Deal found 4/5![Delta logo]()
$438
One-way flights from Greenville to OntarioSearch for one-way flight options from Greenville to Ontario. Find affordable one-way fares based on user searches. Data last updated April 9, 2026.
Search for one-way flight options from Greenville to Ontario. Find affordable one-way fares based on user searches. Data last updated April 9, 2026.
This Kiwi.com deal was found by Cheapflights users on 4/9. 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 5/283:40 pm
GSP
- ONT
2 stops35h 09m
Multiple Airlines
Deal found 4/9![Multiple Airlines logo]()
$184
This Kiwi.com deal was found by Cheapflights users on 4/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 5/258:28 pm
GSP
- ONT
2 stops38h 36m
Multiple Airlines
Deal found 4/9![Multiple Airlines logo]()
$186
This United Airlines deal was found by Cheapflights users on 4/7. 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.
Wed 5/135:45 pm
GSP
- ONT
1 stop7h 50m
United Airlines
Deal found 4/7![United Airlines logo]()
$192
This Southwest deal was found by Cheapflights users on 4/7. 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 5/136:45 am
GSP
- ONT
2 stops8h 30m
Southwest
Deal found 4/7![Southwest logo]()
$197
This Kiwi.com deal was found by Cheapflights users on 4/7. 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.
Mon 6/81:22 pm
GSP
- ONT
2 stops31h 30m
Multiple Airlines
Deal found 4/7![Multiple Airlines logo]()
$201
This Kiwi.com deal was found by Cheapflights users on 4/7. 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.
Mon 4/208:18 pm
GSP
- ONT
3 stops25h 31m
Multiple Airlines
Deal found 4/7![Multiple Airlines logo]()
$205
This Kiwi.com deal was found by Cheapflights users on 4/8. 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 4/248:18 pm
GSP
- ONT
3 stops30h 37m
Multiple Airlines
Deal found 4/8![Multiple Airlines logo]()
$206
This Delta deal was found by Cheapflights users on 4/9. 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 8/233:42 pm
GSP
- ONT
1 stop9h 14m
Delta
Deal found 4/9![Delta logo]()
$234
This Kiwi.com deal was found by Cheapflights users on 4/8. 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 4/232:12 pm
GSP
- ONT
3 stops20h 19m
Multiple Airlines
Deal found 4/8![Multiple Airlines logo]()
$237
Find flight deals from Greenville to Ontario
Discover tips and strategies to find the most affordable flight options for your journey from Greenville (GSP) to Ontario (ONT). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated April 9, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $383 (Delta) |
One-way from | $184 (Kiwi.com) |
Popular in | April |
Cheapest in | January |
Average price | $778 |
Cheapflights Fare Finder
Customize your flight search to find flights from Greenville to Ontario that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated April 9, 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 6/10
5:41 pm-10:46 pm
1 stop8h 05m
Ontario
Tue 6/16
6:30 pm-9:55 am
2 stops12h 25m
$388
GreenvilleOntario
GSP - ONT
GSPONT
Greenville
Fri 6/5
12:55 pm-9:05 pm
2 stops11h 10m
Ontario
Mon 6/8
9:40 pm-12:15 pm
2 stops11h 35m
$454
GreenvilleOntario
GSP - ONT
GSPONT
Greenville
Wed 4/29
5:42 am-12:14 pm
2 stops9h 32m
Ontario
Fri 5/1
10:15 pm-9:09 am
1 stop7h 54m
$465
GreenvilleOntario
GSP - ONT
GSPONT
Greenville
Fri 5/8
12:35 pm-8:45 pm
2 stops11h 10m
Ontario
Fri 5/15
9:55 pm-10:10 am
1 stop9h 15m
$472
GreenvilleOntario
GSP - ONT
GSPONT
Greenville
Wed 6/10
12:50 pm-8:20 pm
2 stops10h 30m
Ontario
Tue 6/16
10:10 am-10:00 pm
2 stops8h 50m
$549
GreenvilleOntario
GSP - ONT
GSPONT
Greenville
Fri 7/10
5:16 pm-9:44 pm
1 stop7h 28m
Ontario
Mon 7/13
5:16 pm-9:13 am
2 stops12h 57m
$558
GreenvilleOntario
GSP - ONT
GSPONT
Greenville
Tue 4/28
5:41 pm-10:31 pm
1 stop7h 50m
Ontario
Wed 4/29
1:27 pm-9:47 am
2 stops17h 20m
$597
GreenvilleOntario
GSP - ONT
GSPONT
Greenville
Wed 4/22
1:55 pm-9:50 pm
2 stops10h 55m
Ontario
Mon 4/27
11:55 pm-1:10 pm
2 stops10h 15m
$597
GreenvilleOntario
GSP - ONT
GSPONT
Greenville
Tue 4/21
12:50 pm-7:35 pm
2 stops9h 45m
Ontario
Sat 4/25
6:20 am-8:40 pm
2 stops11h 20m
$597
Quickest round-trip
GreenvilleOntario
GSP - ONT
GSPONT
Greenville
Thu 4/23
5:42 am-11:36 am
1 stop8h 54m
Ontario
Mon 4/27
10:15 pm-9:09 am
1 stop7h 54m
$607
Showing 1-10 of 21 resultsSorted by cheapest first
Compare providers for flights from Greenville to Ontario
Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Greenville to Ontario in April.
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy1 star | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars |
- Most accurate provider: When it comes to deals on Greenville-Ontario flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Greenville-Ontario flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Greenville-Ontario flight searches over the past month and is updated monthly.
- Most trusted provider: When it comes to deals on Greenville-Ontario flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Greenville-Ontario flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.
Best time to book a flight from Greenville to Ontario
Have a flexible travel schedule? Discover the best time to fly to Ontario from Greenville with our price prediction graph.
GSP-ONT
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.
Cheapflights Insights
Everything you need to know about your flight from Greenville to Ontario
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 April 9, 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
Boarding
8.1
Entertainment
7.8
Crew
8.5
Food
7.2
Comfort
7.9
Reviews
1 / 20
8.0
ExcellentMatthew,Oct 2025
GSP - ATL
Overall
7.9
Boarding
8.1
Entertainment
7.8
Crew
8.5
Food
7.2
Comfort
7.9
Reviews
1 / 20
8.0
ExcellentMatthew,Oct 2025
GSP - ATL
Overall
7.9
Boarding
8.1
Entertainment
7.8
Crew
8.5
Food
7.2
Comfort
7.9
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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Other flights to Ontario
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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 April 9, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$312 | Average$459 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$351 | Average$434 | FlexibilityNo cancel fee | On-timeN/A |