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$161+ 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 2/20. Fares are subject to change and may not be available on all flights or dates of travel.
GSP — ONT
Oct 15 — Oct 221
Wed 10/15
Wed 10/22
1 adult, Economy
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Cheap 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 September 15, 2025.

Round-trip from

$337
(Delta)

One-way from

$161
(American Airlines)

Popular in

November

Cheapest in

February

Average price

$633
From Greenville to Ontario
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One-way flight from Greenville to Ontario
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Highest demand for flights based on searches. 10% potential increase in price ($58 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($14 potential savings vs. average RT price).
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Average for round-trip flights in September 2025
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Find flight deals from Greenville to Ontario

Cheapest flights from Greenville to Ontario
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 September 15, 2025.

This Delta deal was found by Cheapflights users on 9/14. 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.
Tue 11/45:30 amGSP - ONT
1 stop7h 56mDelta
Tue 1/610:30 pmONT - GSP
1 stop7h 57mDelta
Deal found 9/14$337
This Delta deal was found by Cheapflights users on 9/14. 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.
Tue 11/45:30 amGSP - ONT
1 stop7h 56mDelta
Thu 1/810:30 pmONT - GSP
1 stop7h 57mDelta
Deal found 9/14$348
This American Airlines deal was found by Cheapflights users on 9/14. 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.
Sat 11/811:33 amGSP - ONT
2 stops9h 48mAmerican Airlines
Wed 11/1212:46 pmONT - GSP
1 stop6h 17mAmerican Airlines
Deal found 9/14$353
This Delta deal was found by Cheapflights users on 9/14. 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.
Sat 12/65:35 amGSP - ONT
1 stop8h 05mDelta
Mon 12/1510:25 pmONT - GSP
1 stop7h 38mDelta
Deal found 9/14$359
This Delta deal was found by Cheapflights users on 9/14. 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.
Sat 12/65:35 amGSP - ONT
1 stop8h 05mDelta
Fri 12/1210:25 pmONT - GSP
1 stop7h 38mDelta
Deal found 9/14$374
This Delta deal was found by Cheapflights users on 9/14. 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.
Sat 11/11:32 pmGSP - ONT
1 stop8h 47mDelta
Wed 1/710:30 pmONT - GSP
1 stop7h 57mDelta
Deal found 9/14$388
This Delta deal was found by Cheapflights users on 9/14. 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.
Sun 11/25:35 amGSP - ONT
1 stop6h 51mDelta
Wed 1/710:30 pmONT - GSP
1 stop7h 57mDelta
Deal found 9/14$392
This Delta deal was found by Cheapflights users on 9/14. 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.
Sat 11/11:32 pmGSP - ONT
1 stop8h 47mDelta
Thu 1/810:30 pmONT - GSP
1 stop7h 57mDelta
Deal found 9/14$399
This Delta deal was found by Cheapflights users on 9/14. 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.
Sun 12/75:35 amGSP - ONT
1 stop8h 05mDelta
Mon 12/1510:25 pmONT - GSP
1 stop7h 38mDelta
Deal found 9/14$403
This Delta deal was found by Cheapflights users on 9/14. 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.
Sun 12/75:35 amGSP - ONT
1 stop8h 05mDelta
Fri 12/1210:25 pmONT - GSP
1 stop7h 38mDelta
Deal found 9/14$418

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 September 15, 2025.
Use the filters below to find and compare flights from Greenville to Ontario that are best for you.

Fly from

Greenville

Fly to

Ontario

Route

Depart

Return

Price

GreenvilleOntario

GSP - ONT

GSPONT

Greenville

Tue 11/4

5:30 am-10:26 am

1 stop7h 56m

Ontario

Wed 1/7

10:30 pm-9:27 am

1 stop7h 57m

$337

GreenvilleOntario

GSP - ONT

GSPONT

Greenville

Sat 12/6

5:35 am-10:40 am

1 stop8h 05m

Ontario

Mon 12/15

10:25 pm-9:03 am

1 stop7h 38m

$359

GreenvilleOntario

GSP - ONT

GSPONT

Greenville

Sat 12/6

5:35 am-10:40 am

1 stop8h 05m

Ontario

Fri 12/12

10:25 pm-9:03 am

1 stop7h 38m

$374

GreenvilleOntario

GSP - ONT

GSPONT

Greenville

Thu 11/6

6:35 am-10:26 am

1 stop6h 51m

Ontario

Wed 1/7

10:30 pm-9:27 am

1 stop7h 57m

$388

GreenvilleOntario

GSP - ONT

GSPONT

Greenville

Thu 1/15

6:45 am-11:38 am

1 stop7h 53m

Ontario

Tue 1/20

10:30 pm-9:27 am

1 stop7h 57m

$388

GreenvilleOntario

GSP - ONT

GSPONT

Greenville

Wed 11/5

1:45 pm-7:19 pm

1 stop8h 34m

Ontario

Wed 1/7

10:30 pm-9:27 am

1 stop7h 57m

$388

GreenvilleOntario

GSP - ONT

GSPONT

Greenville

Thu 11/6

5:30 am-10:26 am

1 stop7h 56m

Ontario

Tue 1/6

10:30 pm-9:27 am

1 stop7h 57m

$388

GreenvilleOntario

GSP - ONT

GSPONT

Greenville

Sun 11/2

5:35 am-9:26 am

1 stop6h 51m

Ontario

Wed 1/7

10:30 pm-9:27 am

1 stop7h 57m

$392

GreenvilleOntario

GSP - ONT

GSPONT

Greenville

Sat 12/6

5:35 am-10:40 am

1 stop8h 05m

Ontario

Thu 12/11

10:25 pm-9:03 am

1 stop7h 38m

$399

GreenvilleOntario

GSP - ONT

GSPONT

Greenville

Sat 11/1

1:32 pm-7:19 pm

1 stop8h 47m

Ontario

Thu 1/8

10:30 pm-9:27 am

1 stop7h 57m

$399

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/12

Showing 1-10 of 21 results
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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.
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, August is the cheapest month in which you can book a flight from Greenville to Ontario (average of $246). Flying from Greenville to Ontario in March is currently the most expensive (average of $328). 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.

What is the cheapest time of day to fly from GSP to ONT?

Find hourly flight availability from Greenville to Ontario. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated September 15, 2025.

It’s typically best to fly out from Greenville to Ontario in the evening. Doing so could potentially save you 29% on the flight price compared to flying at noon, which is usually more expensive.

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 September 15, 2025.
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.
Delta
8.0
Very good
7,954 reviews

Crew

8.5

Boarding

8.2

Entertainment

7.9

Food

7.3

Comfort

7.9

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception
Delta
8.0
Very good
7,954 reviews
Delta
8.0
Very good
7,954 reviews

Crew

8.5

Boarding

8.2

Entertainment

7.9

Food

7.3

Comfort

7.9

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception
American Airlines
7.2
Good
10,000 reviews
Delta
8.0
Very good
7,954 reviews

Crew

8.5

Boarding

8.2

Entertainment

7.9

Food

7.3

Comfort

7.9

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

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.

  • How long is the flight from Greenville to Ontario?

    Delta can get you from Greenville to Ontario in just under 7h 56m. Your travel time can differ by up to . Airlines will cover a distance of 2004 mi.

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

    Our cheapest airline available from Greenville to Ontario is American Airlines. Our recent data shows that you can find tickets from as low as $312 on this airline. An additional option worth looking into is Delta, starting at $328. Users have found that American Airlines is 35% cheaper than the other options available to this destination.

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

    The cheapest airline one-way is American Airlines, with whom users have recently found tickets for as low as $161. However, be on the lookout for offers from United Airlines and Delta, as they are both options that can get you from Greenville to Ontario for a low price.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from Greenville to Ontario 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 Greenville to Ontario?

    Currently, August is the cheapest month in which you can book a flight from Greenville to Ontario (average of $246). Flying from Greenville to Ontario in March is currently the most expensive (average of $328). 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.

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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 September 15, 2025.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest$312Average$442FlexibilityNo cancel feeOn-time71%
DeltaCheapest$328Average$512FlexibilityNo cancel feeOn-timeN/A

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