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$252+ 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 6/10. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — GSP
Apr 2 — Apr 91
Wed 4/2
Wed 4/9
1 adult, Economy
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Cheap 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 28, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$339
(American Airlines)

One-way from

$252
(United Airlines)

Popular in

February

Cheapest in

April

Average price

$430
Provider with most accurate pricing for Ontario-Greenville flight deals.
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Provider most trusted by Cheapflights users for Ontario-Greenville flights.
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From Ontario to Greenville
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One-way flight from Ontario to Greenville
Search Deals
Highest demand for flights based on searches. 6% potential increase in price ($29 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($11 potential savings vs. average RT price).
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Average for round-trip flights in March 2025
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Find 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 28, 2025.

This American 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/1010:51 amONT - GSP
1 stop8h 07mAmerican Airlines
Sat 5/176:00 amGSP - ONT
1 stop8h 50mAmerican Airlines
Deal found 3/27$339
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.
Thu 4/1710:15 pmONT - GSP
1 stop7h 59mDelta
Wed 4/235:46 amGSP - ONT
1 stop8h 11mDelta
Deal found 3/27$413
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.
Sat 4/265:00 amONT - GSP
1 stop7h 21mUnited Airlines
Sat 5/37:00 amGSP - ONT
2 stops11h 16mUnited Airlines
Deal found 3/27$444
This Southwest 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/147:00 amONT - GSP
1 stop8h 35mSouthwest
Thu 4/1711:20 amGSP - ONT
1 stop10h 15mSouthwest
Deal found 3/27$473
This Alaska 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/186:00 amONT - GSP
2 stops13h 52mAlaska Airlines
Sat 4/1912:07 pmGSP - ONT
2 stops14h 52mAlaska Airlines
Deal found 3/27$499

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 28, 2025.
Use the filters below to find and compare flights from Ontario to Greenville that are best for you.

Fly from

Ontario

Fly to

Greenville

Route

Depart

Return

Price

OntarioGreenville

ONT - GSP

ONTGSP

Ontario

Sat 5/10

10:51 am-9:58 pm

1 stop8h 07m

Greenville

Sat 5/17

6:00 am-11:50 am

1 stop8h 50m

$339

OntarioGreenville

ONT - GSP

ONTGSP

Ontario

Thu 4/17

10:15 pm-9:14 am

1 stop7h 59m

Greenville

Wed 4/23

5:46 am-10:57 am

1 stop8h 11m

$413

OntarioGreenville

ONT - GSP

ONTGSP

Ontario

Sat 4/26

5:00 am-3:21 pm

1 stop7h 21m

Greenville

Sat 5/3

7:00 am-3:16 pm

2 stops11h 16m

$444

OntarioGreenville

ONT - GSP

ONTGSP

Ontario

Mon 4/14

7:00 am-6:35 pm

1 stop8h 35m

Greenville

Thu 4/17

11:20 am-6:35 pm

1 stop10h 15m

$473

OntarioGreenville

ONT - GSP

ONTGSP

Ontario

Sat 4/26

6:00 am-9:54 pm

2 stops12h 54m

Greenville

Sat 5/3

7:43 am-8:29 pm

2 stops15h 46m

$578

OntarioGreenville

ONT - GSP

ONTGSP

Ontario

Tue 6/10

6:00 am-10:15 pm

1 stop13h 15m

$252

OntarioGreenville

ONT - GSP

ONTGSP

Ontario

Tue 6/10

4:45 pm-10:22 am

2 stops14h 37m

$385

OntarioGreenville

ONT - GSP

ONTGSP

Ontario

Wed 5/14

10:00 am-10:43 pm

2 stops9h 43m

$610

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/27

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
eDreamsPrice 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, January is the cheapest month in which you can book a flight from Ontario to Greenville (average of $329). Flying from Ontario to Greenville in March is currently the most expensive (average of $389). 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.

Rainfall in Greenville by month

Plan your trip to Greenville by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Greenville ranges from 3.6 - 5.1 inches per month. March is typically the wettest month, when rainfall can reach 5.1 in. November is typically the driest time to visit Greenville when rainfall is around 3.6 in.

Temperature in Greenville by month

Plan your trip to Greenville by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Greenville, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 78.8 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 41.0 F).

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 28, 2025.
Southwest
8.1
Very good
4,273 reviews

Crew

8.6

Food

7.1

Overall

8.1

Entertainment

7.6

Comfort

8.1

Boarding

8.2

Reviews

1 / 20
10.0
Excellent

Merlyn,Feb 2025

LAX - SMF

New Terminal is neat, lost of stores and places to catch a bite.
Southwest
8.1
Very good
4,273 reviews
Southwest
8.1
Very good
4,273 reviews

Crew

8.6

Food

7.1

Overall

8.1

Entertainment

7.6

Comfort

8.1

Boarding

8.2

Reviews

1 / 20
10.0
Excellent

Merlyn,Feb 2025

LAX - SMF

New Terminal is neat, lost of stores and places to catch a bite.
Alaska Airlines
8.0
Very good
9,798 reviews
Southwest
8.1
Very good
4,273 reviews

Crew

8.6

Food

7.1

Overall

8.1

Entertainment

7.6

Comfort

8.1

Boarding

8.2

Reviews

1 / 20
10.0
Excellent

Merlyn,Feb 2025

LAX - SMF

New Terminal is neat, lost of stores and places to catch a bite.
Delta
8.0
Very good
7,896 reviews
Southwest
8.1
Very good
4,273 reviews

Crew

8.6

Food

7.1

Overall

8.1

Entertainment

7.6

Comfort

8.1

Boarding

8.2

Reviews

1 / 20
10.0
Excellent

Merlyn,Feb 2025

LAX - SMF

New Terminal is neat, lost of stores and places to catch a bite.
United Airlines
7.4
Good
8,603 reviews
Southwest
8.1
Very good
4,273 reviews

Crew

8.6

Food

7.1

Overall

8.1

Entertainment

7.6

Comfort

8.1

Boarding

8.2

Reviews

1 / 20
10.0
Excellent

Merlyn,Feb 2025

LAX - SMF

New Terminal is neat, lost of stores and places to catch a bite.
American Airlines
7.2
Good
10,000 reviews
Southwest
8.1
Very good
4,273 reviews

Crew

8.6

Food

7.1

Overall

8.1

Entertainment

7.6

Comfort

8.1

Boarding

8.2

Reviews

1 / 20
10.0
Excellent

Merlyn,Feb 2025

LAX - SMF

New Terminal is neat, lost of stores and places to catch a bite.

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.

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

    According to our current data, American Airlines ($339), Delta ($413), and United Airlines ($444) offers the cheapest pricing from Ontario to Greenville. These flights start at 22% lower than the current average price 3 months from now.

  • What are the cheapest airlines to fly from Ontario to Greenville one-way?

    One-way options have recently been found by users for as low as $252 on United Airlines. Other airlines that offer cheap prices include Alaska Airlines from $385 and American Airlines from $610 one-way.

  • 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, January is the cheapest month in which you can book a flight from Ontario to Greenville (average of $329). Flying from Ontario to Greenville in March is currently the most expensive (average of $389). 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 Ontario?

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

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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 28, 2025.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$296Average$461FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$338Average$423FlexibilityNo cancel feeOn-time71%
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