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Greenville

$170+ Cheap flights from Ontario to Greenville (ONT - GSP)

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 4/15. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — GSP
Apr 11 — Apr 181
Sat 4/11
Sat 4/18
1 adult, Economy
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Cheap flight deals from Ontario to Greenville

Cheapest flights from Ontario to Greenville
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 March 12, 2026.

This United Airlines deal was found by Cheapflights users on 3/12. 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.
Wed 6/35:00 am
ONT
-
GSP
1 stop7h 19m
United Airlines
Tue 6/95:10 pm
GSP
-
ONT
1 stop7h 45m
United Airlines
Deal found 3/12$367
This Delta deal was found by Cheapflights users on 3/12. 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 5/2610:00 pm
ONT
-
GSP
1 stop8h 04m
Delta
Wed 6/311:43 am
GSP
-
ONT
2 stops13h 49m
Delta
Deal found 3/12$372
This American Airlines deal was found by Cheapflights users on 3/12. 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 4/1311:29 pm
ONT
-
GSP
1 stop7h 22m
American Airlines
Wed 4/155:12 pm
GSP
-
ONT
1 stop8h 24m
American Airlines
Deal found 3/12$378
This Delta deal was found by Cheapflights users on 3/8. 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.
Mon 3/3010:25 pm
ONT
-
GSP
1 stop8h 01m
Delta
Wed 4/15:40 am
GSP
-
ONT
1 stop9h 07m
Delta
Deal found 3/8$389
This American Airlines deal was found by Cheapflights users on 3/12. 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.
Sun 5/1010:26 pm
ONT
-
GSP
1 stop8h 53m
American Airlines
Tue 6/27:55 pm
GSP
-
ONT
1 stop7h 04m
American Airlines
Deal found 3/12$417
This Delta deal was found by Cheapflights users on 3/7. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/1910:00 pm
ONT
-
GSP
1 stop8h 04m
Delta
Sat 5/305:05 pm
GSP
-
ONT
1 stop7h 43m
Delta
Deal found 3/7$418
This Southwest deal was found by Cheapflights users on 3/10. 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 4/149:55 pm
ONT
-
GSP
2 stops11h 15m
Southwest
Sun 4/198:00 am
GSP
-
ONT
1 stop10h 10m
Southwest
Deal found 3/10$422
This American Airlines deal was found by Cheapflights users on 3/12. 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.
Tue 5/2610:00 pm
ONT
-
GSP
1 stop9h 08m
American Airlines
Wed 6/35:25 pm
GSP
-
ONT
1 stop9h 34m
American Airlines
Deal found 3/12$423
This United Airlines deal was found by Cheapflights users on 3/12. 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 4/116:49 pm
ONT
-
GSP
2 stops12h 06m
United Airlines
Sat 4/184:41 pm
GSP
-
ONT
1 stop8h 09m
United Airlines
Deal found 3/12$424
This American Airlines deal was found by Cheapflights users on 3/12. 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.
Fri 5/811:59 pm
ONT
-
GSP
1 stop8h 45m
American Airlines
Sat 5/237:55 pm
GSP
-
ONT
1 stop7h 04m
American Airlines
Deal found 3/12$428

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 March 12, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$372
(Delta)

One-way from

$170
(Kiwi.com)

Popular in

February

Cheapest in

October

Average price

$466
Provider with most accurate pricing for Ontario-Greenville flight deals.
Search Deals
Provider most trusted by Cheapflights users for Ontario-Greenville flights.
Search Deals
From Ontario to Greenville
Search Deals
One-way flight from Ontario to Greenville
Search Deals
Highest demand for flights based on searches. 24% potential increase in price ($143 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 9% potential price decrease ($40 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in March 2026
Search Deals

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 2,558,603 searches. Data last updated March 12, 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

Price

Cheapest round-trip

OntarioGreenville

ONT - GSP

ONTGSP

Ontario

Sun 5/10

4:57 pm-9:04 am

2 stops13h 07m

Greenville

Tue 6/2

11:43 am-10:32 pm

2 stops13h 49m

$428

OntarioGreenville

ONT - GSP

ONTGSP

Ontario

Mon 6/1

9:55 pm-1:10 pm

1 stop12h 15m

Greenville

Fri 6/12

12:55 pm-8:50 pm

2 stops10h 55m

$429

OntarioGreenville

ONT - GSP

ONTGSP

Ontario

Wed 6/24

10:59 pm-9:27 am

1 stop7h 28m

Greenville

Wed 7/1

3:42 pm-10:09 pm

1 stop9h 27m

$473

OntarioGreenville

ONT - GSP

ONTGSP

Ontario

Wed 5/6

6:59 pm-9:47 am

2 stops11h 48m

Greenville

Mon 5/11

10:40 am-8:36 pm

2 stops12h 56m

$490

OntarioGreenville

ONT - GSP

ONTGSP

Ontario

Sat 6/27

10:59 pm-9:27 am

1 stop7h 28m

Greenville

Wed 7/1

3:42 pm-10:09 pm

1 stop9h 27m

$499

OntarioGreenville

ONT - GSP

ONTGSP

Ontario

Sat 6/27

10:59 pm-9:27 am

1 stop7h 28m

Greenville

Tue 6/30

5:05 pm-10:09 pm

1 stop8h 04m

$499

OntarioGreenville

ONT - GSP

ONTGSP

Ontario

Sat 5/16

7:00 am-4:57 pm

1 stop6h 57m

Greenville

Sat 5/23

4:15 pm-8:42 pm

1 stop7h 27m

$509

OntarioGreenville

ONT - GSP

ONTGSP

Ontario

Tue 4/21

7:00 am-4:52 pm

1 stop6h 52m

Greenville

Wed 4/22

12:34 pm-10:45 pm

2 stops13h 11m

$512
Quickest round-trip

OntarioGreenville

ONT - GSP

ONTGSP

Ontario

Sun 5/17

5:00 am-2:49 pm

1 stop6h 49m

Greenville

Sun 5/24

4:15 pm-8:42 pm

1 stop7h 27m

$547
Cheapest one-way

OntarioGreenville

ONT - GSP

ONTGSP

Ontario

Wed 4/15

12:49 pm-10:13 pm

1 stop6h 24m

$184

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/9

Showing 1-10 of 17 resultsSorted by cheapest first
1
2

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 March.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • 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.
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, May is the cheapest month in which you can book a flight from Ontario to Greenville (average of $117). Flying from Ontario to Greenville in January is currently the most expensive (average of $258). 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.

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 March 12, 2026.
Peruse reviews from past customers who have flown with Delta and American 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.
Delta
7.9
Good
8,286 reviews

Comfort

7.9

Crew

8.5

Food

7.2

Boarding

8.1

Entertainment

7.8

Overall

7.9

Reviews

1 / 20
10.0
Excellent

Michael,Sep 2023

SMF - ATL

Not sufficient leg room and three seats are very tigh.t on 737 in economy main cabin
Delta
7.9
Good
8,286 reviews
Delta
7.9
Good
8,286 reviews

Comfort

7.9

Crew

8.5

Food

7.2

Boarding

8.1

Entertainment

7.8

Overall

7.9

Reviews

1 / 20
10.0
Excellent

Michael,Sep 2023

SMF - ATL

Not sufficient leg room and three seats are very tigh.t on 737 in economy main cabin
American Airlines
7.1
Good
11,435 reviews
Delta
7.9
Good
8,286 reviews

Comfort

7.9

Crew

8.5

Food

7.2

Boarding

8.1

Entertainment

7.8

Overall

7.9

Reviews

1 / 20
10.0
Excellent

Michael,Sep 2023

SMF - ATL

Not sufficient leg room and three seats are very tigh.t on 737 in economy main cabin

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.

  • How long is the flight from Ontario to Greenville?

    Departing from Ontario to Greenville will take you 11h 48m. The distance between Ontario and Greenville is about 2004 mi. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

  • What are the cheapest airlines flying from Ontario to Greenville round-trip?

    According to our current data, Delta ($228), and American Airlines ($274) offers the cheapest pricing from Ontario to Greenville. These flights start at 49% lower than the current average price 3 months from now.

  • Can I find deals for flights from Ontario to Greenville that include hotel bookings?

    Yes. In addition to deals on Ontario to Greenville flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Ontario to Greenville?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Ontario to Greenville.

  • Can I find deals for business class flights from Ontario to Greenville?

    Yes. Cheapflights offers flight deals from Ontario to Greenville by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from Ontario to Greenville?

    Currently, May is the cheapest month in which you can book a flight from Ontario to Greenville (average of $117). Flying from Ontario to Greenville in January is currently the most expensive (average of $258). 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.

See more FAQs

Traveling to a place near Greenville?

Book flights to Greenville if you plan to visit one of these locations
Simpsonville
Duncan
Greer
Seneca
Anderson

Browse thousands of different options on Cheapflights for your next trip

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Top 2 airlines flying from Ontario to Greenville

Discover the top 2 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 2,558,603 searches. Data last updated March 12, 2026.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$228Average$446FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$274Average$406FlexibilityNo cancel feeOn-time71%

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