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$154+ 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 12/25. Fares are subject to change and may not be available on all flights or dates of travel.
GSP — ONT
Jan 17 — Jan 241
Sat 1/17
Sat 1/24
1 adult, Economy
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Cheap 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 December 18, 2025.

This Southwest deal was found by Cheapflights users on 12/15. 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.
Thu 12/2510:35 amGSP - ONT
1 stop11h 05mSouthwest
Thu 1/15:25 amONT - GSP
1 stop6h 00mSouthwest
Deal found 12/15$432
This United Airlines deal was found by Cheapflights users on 12/15. 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.
Thu 12/259:40 amGSP - ONT
2 stops14h 27mUnited Airlines
Thu 1/15:05 amONT - GSP
2 stops12h 42mUnited Airlines
Deal found 12/15$477
This Southwest deal was found by Cheapflights users on 12/17. 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 12/304:20 pmGSP - ONT
2 stops9h 50mSouthwest
Wed 1/145:45 pmONT - GSP
2 stops13h 25mSouthwest
Deal found 12/17$640
This Southwest deal was found by Cheapflights users on 12/17. 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 12/294:20 pmGSP - ONT
2 stops9h 50mSouthwest
Wed 1/75:45 pmONT - GSP
2 stops13h 55mSouthwest
Deal found 12/17$680
This Delta deal was found by Cheapflights users on 12/17. 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 12/295:45 amGSP - ONT
1 stop7h 15mDelta
Wed 1/710:30 pmONT - GSP
1 stop7h 49mDelta
Deal found 12/17$690
This Southwest deal was found by Cheapflights users on 12/15. 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.
Tue 12/304:20 pmGSP - ONT
2 stops9h 50mSouthwest
Mon 1/510:50 amONT - GSP
1 stop7h 45mSouthwest
Deal found 12/15$747
This Delta deal was found by Cheapflights users on 12/15. 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.
Sun 12/285:45 amGSP - ONT
1 stop7h 15mDelta
Mon 1/510:30 pmONT - GSP
1 stop7h 49mDelta
Deal found 12/15$753

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 December 18, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$340
(United Airlines)

One-way from

$154
(Delta)

Popular in

November

Cheapest in

January

Average price

$486
Provider with most accurate pricing for Greenville-Ontario flight deals.
Search Deals
Provider most trusted by Cheapflights users for Greenville-Ontario flights.
Search Deals
From Greenville to Ontario
Search Deals
One-way flight from Greenville to Ontario
Search Deals
Highest demand for flights based on searches. 6% potential increase in price ($31 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($10 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in December 2025
Search Deals

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 December 18, 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

Thu 1/8

5:40 am-12:16 pm

2 stops9h 36m

Ontario

Sat 1/17

10:30 pm-9:19 am

1 stop7h 49m

$355

GreenvilleOntario

GSP - ONT

GSPONT

Greenville

Thu 1/8

4:50 pm-9:58 pm

1 stop8h 08m

Ontario

Tue 1/13

5:05 am-3:20 pm

1 stop7h 15m

$383

GreenvilleOntario

GSP - ONT

GSPONT

Greenville

Wed 1/7

11:15 am-5:10 pm

2 stops8h 55m

Ontario

Wed 1/14

5:45 pm-10:10 am

2 stops13h 25m

$383

GreenvilleOntario

GSP - ONT

GSPONT

Greenville

Thu 1/8

4:50 pm-9:58 pm

1 stop8h 08m

Ontario

Wed 1/14

5:05 am-3:20 pm

1 stop7h 15m

$383

GreenvilleOntario

GSP - ONT

GSPONT

Greenville

Thu 1/8

5:40 am-11:31 am

1 stop8h 51m

Ontario

Wed 1/14

12:41 pm-11:55 pm

1 stop8h 14m

$383

GreenvilleOntario

GSP - ONT

GSPONT

Greenville

Thu 1/8

5:40 am-12:16 pm

2 stops9h 36m

Ontario

Tue 1/13

12:41 pm-11:55 pm

1 stop8h 14m

$388

GreenvilleOntario

GSP - ONT

GSPONT

Greenville

Thu 1/8

10:05 am-4:55 pm

2 stops9h 50m

Ontario

Wed 1/14

5:55 am-5:35 pm

2 stops8h 40m

$393

GreenvilleOntario

GSP - ONT

GSPONT

Greenville

Tue 3/10

5:40 am-11:35 am

1 stop8h 55m

Ontario

Tue 3/17

10:30 pm-9:26 am

1 stop7h 56m

$410

GreenvilleOntario

GSP - ONT

GSPONT

Greenville

Thu 1/1

3:05 pm-7:15 pm

1 stop7h 10m

$250

GreenvilleOntario

GSP - ONT

GSPONT

Greenville

Sun 3/8

5:40 am-10:35 am

1 stop8h 55m

$270

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/17

Showing 1-10 of 17 results
1
2

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 December.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy2 starsTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*1 star
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 Greenville-Ontario flights, users find the pricing of eDreams to be most consistent on Cheapflights vs. eDreams Users can find the same prices on Greenville-Ontario flight deals on Cheapflights vs. eDreams >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 eDreams the most. eDreams 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.
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, June is the cheapest month in which you can book a flight from Greenville to Ontario (average of $105). Flying from Greenville to Ontario in April is currently the most expensive (average of $198). 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 December 18, 2025.

It’s typically best to fly out from Greenville to Ontario in the evening. Doing so could potentially save you 28% 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 December 18, 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
7.9
Good
8,005 reviews

Crew

8.5

Food

7.3

Overall

7.9

Comfort

7.9

Boarding

8.1

Entertainment

7.9

Reviews

1 / 20
8.0
Excellent

Matthew,Oct 2025

GSP - ATL

This is always a full flight since it is the connecting route to primary destinations through Atlanta. That said, the crew handles the full load well. Not much more to say, it is a short flight with no in-flight services due to the length.
Delta
7.9
Good
8,005 reviews
Delta
7.9
Good
8,005 reviews

Crew

8.5

Food

7.3

Overall

7.9

Comfort

7.9

Boarding

8.1

Entertainment

7.9

Reviews

1 / 20
8.0
Excellent

Matthew,Oct 2025

GSP - ATL

This is always a full flight since it is the connecting route to primary destinations through Atlanta. That said, the crew handles the full load well. Not much more to say, it is a short flight with no in-flight services due to the length.
American Airlines
7.2
Good
11,054 reviews
Delta
7.9
Good
8,005 reviews

Crew

8.5

Food

7.3

Overall

7.9

Comfort

7.9

Boarding

8.1

Entertainment

7.9

Reviews

1 / 20
8.0
Excellent

Matthew,Oct 2025

GSP - ATL

This is always a full flight since it is the connecting route to primary destinations through Atlanta. That said, the crew handles the full load well. Not much more to say, it is a short flight with no in-flight services due to the length.

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, United Airlines, and Southwest can get you from Greenville to Ontario in just under 8h 08m. Your travel time can differ by up to 1h 28m. Airlines will cover a distance of 2004 mi. Both multi-stop and nonstop flights can be found to your destination and back.

  • 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 $346. Users have found that American Airlines is 28% cheaper than the other options available to this destination.

  • 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, June is the cheapest month in which you can book a flight from Greenville to Ontario (average of $105). Flying from Greenville to Ontario in April is currently the most expensive (average of $198). 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

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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 December 18, 2025.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest$312Average$420FlexibilityNo cancel feeOn-time71%
DeltaCheapest$346Average$438FlexibilityNo cancel feeOn-timeN/A

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