HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Ontario

$182+ 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 7/29. Fares are subject to change and may not be available on all flights or dates of travel.
GSP — ONT
Jul 18 — Jul 251
Sat 7/18
Sat 7/25
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

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 June 18, 2026.

This Delta deal was found by Cheapflights users on 6/14. 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 9/295:45 am
GSP
-
ONT
1 stop8h 02m
Delta
Tue 10/610:59 pm
ONT
-
GSP
1 stop7h 26m
Delta
Deal found 6/14$363
This Delta deal was found by Cheapflights users on 6/14. 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 9/157:00 am
GSP
-
ONT
1 stop6h 47m
Delta
Mon 9/2110:00 pm
ONT
-
GSP
1 stop8h 14m
Delta
Deal found 6/14$391
This United Airlines deal was found by Cheapflights users on 6/14. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/41:10 pm
GSP
-
ONT
2 stops12h 56m
United Airlines
Sat 11/146:02 am
ONT
-
GSP
1 stop6h 16m
United Airlines
Deal found 6/14$396
This Delta deal was found by Cheapflights users on 6/16. 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 7/36:45 am
GSP
-
ONT
1 stop6h 55m
Delta
Sat 7/411:50 am
ONT
-
GSP
1 stop9h 09m
Delta
Deal found 6/16$403
This United Airlines deal was found by Cheapflights users on 6/15. 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 11/128:40 am
GSP
-
ONT
2 stops12h 07m
United Airlines
Tue 11/176:02 am
ONT
-
GSP
1 stop6h 16m
United Airlines
Deal found 6/15$407
This Southwest deal was found by Cheapflights users on 6/14. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/312:55 pm
GSP
-
ONT
2 stops11h 10m
Southwest
Sat 7/46:00 am
ONT
-
GSP
1 stop6h 50m
Southwest
Deal found 6/14$408
This Delta deal was found by Cheapflights users on 6/14. 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 9/297:00 am
GSP
-
ONT
1 stop6h 47m
Delta
Fri 10/910:59 pm
ONT
-
GSP
1 stop7h 26m
Delta
Deal found 6/14$415
This Delta deal was found by Cheapflights users on 6/14. 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 9/266:00 am
GSP
-
ONT
1 stop7h 47m
Delta
Thu 10/810:59 pm
ONT
-
GSP
1 stop8h 59m
Delta
Deal found 6/14$419
This United Airlines deal was found by Cheapflights users on 6/15. 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.
Fri 11/135:41 pm
GSP
-
ONT
1 stop7h 45m
United Airlines
Tue 11/176:53 pm
ONT
-
GSP
2 stops10h 51m
United Airlines
Deal found 6/15$420
This Delta deal was found by Cheapflights users on 6/14. 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.
Mon 10/56:25 pm
GSP
-
ONT
1 stop7h 01m
Delta
Tue 10/1310:59 pm
ONT
-
GSP
1 stop7h 26m
Delta
Deal found 6/14$421

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 June 18, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$363
(Delta)

One-way from

$182
(American Airlines)

Popular in

April

Cheapest in

January

Average price

$442
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. 15% potential increase in price ($90 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 6% potential price decrease ($34 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in June 2026
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 June 18, 2026.
Use the filters below to find and compare flights from Greenville to Ontario that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip
Quickest round-trip

GreenvilleOntario

GSP - ONT

GSPONT

Greenville

Tue 10/6

2:25 pm-6:18 pm

1 stop6h 53m

Ontario

Mon 10/12

10:59 pm-9:25 am

1 stop7h 26m

$391

GreenvilleOntario

GSP - ONT

GSPONT

Greenville

Tue 8/18

10:33 am-8:01 pm

2 stops12h 28m

Ontario

Wed 8/19

5:00 am-3:15 pm

1 stop7h 15m

$478

GreenvilleOntario

GSP - ONT

GSPONT

Greenville

Fri 7/3

3:36 pm-9:48 pm

1 stop9h 12m

Ontario

Tue 7/14

7:05 am-7:10 pm

1 stop9h 05m

$509

GreenvilleOntario

GSP - ONT

GSPONT

Greenville

Mon 8/10

5:20 pm-9:52 pm

1 stop7h 32m

Ontario

Mon 8/17

10:00 pm-9:18 am

1 stop8h 18m

$517

GreenvilleOntario

GSP - ONT

GSPONT

Greenville

Wed 9/16

4:33 pm-8:53 pm

1 stop7h 20m

Ontario

Mon 9/21

5:00 am-3:14 pm

1 stop7h 14m

$556

GreenvilleOntario

GSP - ONT

GSPONT

Greenville

Tue 8/25

2:18 pm-8:53 pm

2 stops9h 35m

Ontario

Wed 8/26

5:00 am-9:07 pm

2 stops13h 07m

$566

GreenvilleOntario

GSP - ONT

GSPONT

Greenville

Tue 7/28

5:43 pm-10:51 pm

1 stop8h 08m

Ontario

Tue 8/4

5:00 am-3:19 pm

1 stop7h 19m

$577

GreenvilleOntario

GSP - ONT

GSPONT

Greenville

Tue 7/14

5:43 pm-10:51 pm

1 stop8h 08m

Ontario

Tue 7/21

5:00 am-3:19 pm

1 stop7h 19m

$611

GreenvilleOntario

GSP - ONT

GSPONT

Greenville

Fri 7/3

5:43 pm-10:51 pm

1 stop8h 08m

Ontario

Tue 7/28

5:00 am-3:19 pm

1 stop7h 19m

$637

GreenvilleOntario

GSP - ONT

GSPONT

Greenville

Sat 7/18

5:10 pm-9:55 pm

1 stop7h 45m

Ontario

Tue 7/21

6:10 am-11:34 pm

2 stops14h 24m

$668

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/13

Showing 1-10 of 19 resultsSorted by cheapest first
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 June.
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 Greenville-Ontario flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Greenville-Ontario flight deals on Cheapflights vs. FlightHub >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 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 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

How much does it cost to fly round-trip from Greenville to Ontario?

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 June 18, 2026.
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
7.8
Good
8,410 reviews

Food

7.2

Crew

8.5

Overall

7.8

Entertainment

7.8

Comfort

7.8

Boarding

8.1

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
7.8
Good
8,410 reviews
Delta
7.8
Good
8,410 reviews

Food

7.2

Crew

8.5

Overall

7.8

Entertainment

7.8

Comfort

7.8

Boarding

8.1

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
7.1
Good
11,686 reviews
Delta
7.8
Good
8,410 reviews

Food

7.2

Crew

8.5

Overall

7.8

Entertainment

7.8

Comfort

7.8

Boarding

8.1

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 and United Airlines can get you from Greenville to Ontario in just under 6h 53m. Your travel time can differ by up to 5h 35m. 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 Delta. Our recent data shows that you can find tickets from as low as $351 on this airline. An additional option worth looking into is American Airlines, starting at $368. Users have found that Delta is 31% 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.

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 Diego flights
Charlotte to San Francisco flights
Charleston to Las Vegas flights
Charlotte to Ontario flights
Columbia to Las Vegas flights
Charlotte to Santa Ana flights
Myrtle Beach to Las Vegas flights
Charleston to San Francisco flights
Greenville to Las Vegas flights
Greenville to San Francisco flights
Savannah to Las Vegas flights
Greenville to San Diego flights
Charlotte to Reno flights
Charlotte to Sacramento flights
Columbia to Los Angeles flights
Charleston to San Diego flights
Augusta to Las Vegas flights
Greenville to Los Angeles flights
Savannah to Los Angeles flights
Charleston to Los Angeles flights
Savannah to San Francisco flights
Charlotte to Santa Barbara flights
Columbia to San Diego flights
Charlotte to San Jose flights
Charleston to Reno flights
Charlotte to Palm Springs flights
Myrtle Beach to Los Angeles flights
Charlotte to Fresno flights
Greenville to Reno flights
Savannah to San Diego flights
Columbia to Ontario flights
Savannah to Santa Ana flights
Charlotte to Monterey flights
Charleston to Ontario flights
Charleston to Sacramento flights
Myrtle Beach to Ontario flights
Charlotte to Burbank flights
Savannah to Ontario flights
Greenville to San Jose flights
Myrtle Beach to San Francisco flights
Columbia to Sacramento flights
Myrtle Beach to Santa Ana flights
Augusta to Los Angeles flights
Charlotte to Oakland flights
Charleston to Burbank 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 June 18, 2026.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$351Average$434FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$368Average$480FlexibilityNo cancel feeOn-time71%

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.