HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Ontario

$159+ 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 10/7. Fares are subject to change and may not be available on all flights or dates of travel.
GSP — ONT
Aug 25 — Sep 11
Mon 8/25
Mon 9/1
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Greenville to Ontario with Cheapflights

1. Tell us where you want to go

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

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

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 August 20, 2025.

Round-trip from

$326
(American Airlines)

One-way from

$159
(Delta)

Popular in

September

Cheapest in

October

Average price

$434
From Greenville to Ontario
Search Deals
One-way flight from Greenville to Ontario
Search Deals
Highest demand for flights based on searches. 2% potential increase in price ($10 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease ($19 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in August 2025
Search Deals

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 August 20, 2025.

This American Airlines deal was found by Cheapflights users on 8/20. 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 12/257:53 pmGSP - ONT
1 stop6h 55mAmerican Airlines
Wed 12/3111:12 pmONT - GSP
1 stop5h 57mAmerican Airlines
Deal found 8/20$326
This American Airlines deal was found by Cheapflights users on 8/18. 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 11/255:22 amGSP - ONT
1 stop7h 35mAmerican Airlines
Tue 12/212:46 pmONT - GSP
1 stop8h 09mAmerican Airlines
Deal found 8/18$346
This Delta deal was found by Cheapflights users on 8/19. 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 10/36:13 pmGSP - ONT
1 stop7h 10mDelta
Sat 10/1811:36 amONT - GSP
1 stop7h 42mDelta
Deal found 8/19$352
This American Airlines deal was found by Cheapflights users on 8/20. 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 12/257:53 pmGSP - ONT
1 stop6h 55mAmerican Airlines
Tue 12/3011:59 pmONT - GSP
1 stop8h 26mAmerican Airlines
Deal found 8/20$377
This Southwest deal was found by Cheapflights users on 8/18. 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 11/33:05 pmGSP - ONT
1 stop7h 10mSouthwest
Thu 11/1310:50 amONT - GSP
1 stop7h 45mSouthwest
Deal found 8/18$391
This Southwest deal was found by Cheapflights users on 8/18. 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 11/254:20 pmGSP - ONT
2 stops9h 50mSouthwest
Tue 12/26:30 pmONT - GSP
2 stops12h 30mSouthwest
Deal found 8/18$392
This Delta deal was found by Cheapflights users on 8/18. 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 10/105:16 pmGSP - ONT
1 stop8h 06mDelta
Tue 10/1410:00 pmONT - GSP
1 stop7h 59mDelta
Deal found 8/18$402

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 August 20, 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 12/25

7:53 pm-11:48 pm

1 stop6h 55m

Ontario

Wed 12/31

11:12 pm-8:09 am

1 stop5h 57m

$326

GreenvilleOntario

GSP - ONT

GSPONT

Greenville

Tue 11/25

5:22 am-9:57 am

1 stop7h 35m

Ontario

Tue 12/2

12:46 pm-11:55 pm

1 stop8h 09m

$346

GreenvilleOntario

GSP - ONT

GSPONT

Greenville

Fri 10/3

6:13 pm-10:23 pm

1 stop7h 10m

Ontario

Sat 10/18

11:36 am-10:18 pm

1 stop7h 42m

$352

GreenvilleOntario

GSP - ONT

GSPONT

Greenville

Thu 12/25

7:53 pm-11:48 pm

1 stop6h 55m

Ontario

Tue 12/30

11:59 pm-11:25 am

1 stop8h 26m

$377

GreenvilleOntario

GSP - ONT

GSPONT

Greenville

Mon 11/3

3:05 pm-7:15 pm

1 stop7h 10m

Ontario

Thu 11/13

10:50 am-9:35 pm

1 stop7h 45m

$391

GreenvilleOntario

GSP - ONT

GSPONT

Greenville

Tue 11/25

4:20 pm-11:10 pm

2 stops9h 50m

Ontario

Tue 12/2

6:30 pm-10:00 am

2 stops12h 30m

$392

GreenvilleOntario

GSP - ONT

GSPONT

Greenville

Tue 10/7

6:35 am-10:26 am

1 stop6h 51m

$159

GreenvilleOntario

GSP - ONT

GSPONT

Greenville

Wed 1/7

5:45 am-11:38 am

1 stop8h 53m

$159

GreenvilleOntario

GSP - ONT

GSPONT

Greenville

Sat 10/4

7:35 am-10:42 am

1 stop6h 07m

$168

GreenvilleOntario

GSP - ONT

GSPONT

Greenville

Fri 10/3

6:13 pm-10:23 pm

1 stop7h 10m

$185

Flights are sorted by cheapest round-trip flights first.

Deals found on 8/20

Showing 1-10 of 15 results
1
2

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 August 20, 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 August 20, 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
7,982 reviews

Overall

8.0

Crew

8.5

Food

7.3

Comfort

7.9

Boarding

8.2

Entertainment

7.9

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
7,982 reviews
Delta
8.0
Very good
7,982 reviews

Overall

8.0

Crew

8.5

Food

7.3

Comfort

7.9

Boarding

8.2

Entertainment

7.9

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
7,982 reviews

Overall

8.0

Crew

8.5

Food

7.3

Comfort

7.9

Boarding

8.2

Entertainment

7.9

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?

    American Airlines can get you from Greenville to Ontario in just under 6h 55m. 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 33% 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, 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.

See more FAQs

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Greenville to Ontario

See prices for flight routes from nearby airports that may be better suited for you.
Charlotte to Las Vegas flights
Charlotte to Los Angeles flights
Charlotte to San Francisco flights
Savannah to Las Vegas flights
Charleston to Las Vegas flights
Hilton Head Island to Las Vegas flights
Charlotte to Ontario flights
Greenville to Las Vegas flights
Charlotte to Burbank flights
Charlotte to San Diego flights
Charlotte to Santa Ana flights
Charlotte to Sacramento flights
Myrtle Beach to Las Vegas flights
Charleston to San Francisco flights
Augusta to Las Vegas flights
Columbia to Las Vegas flights
Charleston to Los Angeles flights
Savannah to Los Angeles flights
Charlotte to Palm Springs flights
Charleston to Ontario flights
Charleston to San Diego flights
Columbia to San Diego flights
Greenville to San Diego flights
Charlotte to San Jose flights
Columbia to Los Angeles flights
Charleston to Palm Springs flights
Savannah to San Francisco flights
Charlotte to Reno flights
Savannah to Ontario flights
Myrtle Beach to San Diego flights
Greenville to Los Angeles flights
Savannah to San Diego flights
Greenville to San Francisco flights
Augusta to Los Angeles flights
Charlotte to Oakland flights
Columbia to San Francisco flights
Charleston to Burbank flights
Charlotte to Fresno flights
Myrtle Beach to Los Angeles flights
Augusta to San Francisco flights
Greenville to Santa Ana flights
Charlotte to Long Beach flights
Myrtle Beach to Sacramento flights
Columbia to Ontario flights
Savannah to Santa Ana flights
Greenville to Sacramento flights
Charleston to Reno flights
Greenville to Palm Springs flights
Charleston to Santa Ana flights

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 August 20, 2025.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest$312Average$434FlexibilityNo cancel feeOn-time71%
DeltaCheapest$328Average$547FlexibilityNo cancel feeOn-timeN/A

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.