HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Ontario

$178+ 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 4/24. Fares are subject to change and may not be available on all flights or dates of travel.
GSP — ONT
May 4 — May 111
Mon 5/4
Mon 5/11
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 April 4, 2026.

This Southwest deal was found by Cheapflights users on 4/1. 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 5/265:05 pm
GSP
-
ONT
1 stop6h 30m
Southwest
Tue 6/29:55 pm
ONT
-
GSP
1 stop12h 15m
Southwest
Deal found 4/1$401
This Southwest deal was found by Cheapflights users on 4/2. 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 5/78:10 am
GSP
-
ONT
1 stop10h 05m
Southwest
Sat 5/99:45 am
ONT
-
GSP
1 stop7h 55m
Southwest
Deal found 4/2$409
This United Airlines deal was found by Cheapflights users on 4/2. 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 5/75:45 pm
GSP
-
ONT
1 stop7h 50m
United Airlines
Sun 5/105:00 am
ONT
-
GSP
1 stop6h 49m
United Airlines
Deal found 4/2$438
This Southwest deal was found by Cheapflights users on 4/2. 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 5/76:25 am
GSP
-
ONT
2 stops11h 00m
Southwest
Sun 5/109:45 am
ONT
-
GSP
2 stops10h 40m
Southwest
Deal found 4/2$454
This Southwest deal was found by Cheapflights users on 4/2. 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.
Wed 4/295:05 pm
GSP
-
ONT
1 stop6h 30m
Southwest
Fri 5/19:55 pm
ONT
-
GSP
1 stop9h 15m
Southwest
Deal found 4/2$460
This Delta deal was found by Cheapflights users on 3/31. 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 7/305:16 pm
GSP
-
ONT
1 stop7h 28m
Delta
Wed 8/57:05 am
ONT
-
GSP
1 stop9h 05m
Delta
Deal found 3/31$467

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 April 4, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$401
(Southwest)

One-way from

$178
(Kiwi.com)

Popular in

April

Cheapest in

January

Average price

$778
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. 11% potential increase in price ($60 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 6% potential price decrease ($29 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in April 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 April 4, 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

GreenvilleOntario

GSP - ONT

GSPONT

Greenville

Tue 5/26

5:05 pm-8:35 pm

1 stop6h 30m

Ontario

Tue 6/2

9:55 pm-1:10 pm

1 stop12h 15m

$401
Quickest round-trip

GreenvilleOntario

GSP - ONT

GSPONT

Greenville

Sun 8/30

7:45 am-11:04 am

1 stop6h 19m

Ontario

Sun 8/30

10:59 pm-9:27 am

1 stop7h 28m

$467

GreenvilleOntario

GSP - ONT

GSPONT

Greenville

Tue 4/28

5:41 pm-10:31 pm

1 stop7h 50m

Ontario

Wed 4/29

6:49 pm-9:47 am

2 stops11h 58m

$570

GreenvilleOntario

GSP - ONT

GSPONT

Greenville

Tue 4/14

5:05 pm-8:35 pm

1 stop6h 30m

Ontario

Sat 4/18

9:45 am-8:40 pm

1 stop7h 55m

$587

GreenvilleOntario

GSP - ONT

GSPONT

Greenville

Sat 4/18

6:30 am-5:47 pm

3 stops14h 17m

Ontario

Sat 5/2

6:59 pm-9:47 am

2 stops11h 48m

$670

GreenvilleOntario

GSP - ONT

GSPONT

Greenville

Wed 4/15

5:41 pm-10:31 pm

1 stop7h 50m

Ontario

Sat 4/18

6:05 am-3:54 pm

1 stop6h 49m

$697
Cheapest one-way

GreenvilleOntario

GSP - ONT

GSPONT

Greenville

Wed 9/9

5:45 am-11:04 am

1 stop8h 19m

$234

GreenvilleOntario

GSP - ONT

GSPONT

Greenville

Sun 7/12

7:55 am-3:55 pm

1 stop11h 00m

$274
Quickest one-way

GreenvilleOntario

GSP - ONT

GSPONT

Greenville

Tue 9/8

6:45 am-11:04 am

1 stop7h 19m

$300

GreenvilleOntario

GSP - ONT

GSPONT

Greenville

Mon 7/13

5:41 pm-10:51 pm

1 stop8h 10m

$324

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/1

Showing 1-10 of 16 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 April.
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

What is the cheapest month to book a flight from Greenville to Ontario?

Currently, March is the cheapest month in which you can book a flight from Greenville to Ontario (average of $96). Flying from Greenville to Ontario in February is currently the most expensive (average of $246). 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.

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 April 4, 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
7.9
Good
8,383 reviews

Crew

8.5

Entertainment

7.8

Boarding

8.1

Comfort

7.9

Overall

7.9

Food

7.2

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
8,383 reviews
Delta
7.9
Good
8,383 reviews

Crew

8.5

Entertainment

7.8

Boarding

8.1

Comfort

7.9

Overall

7.9

Food

7.2

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
11,556 reviews
Delta
7.9
Good
8,383 reviews

Crew

8.5

Entertainment

7.8

Boarding

8.1

Comfort

7.9

Overall

7.9

Food

7.2

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?

    Southwest, Delta, and United Airlines can get you from Greenville to Ontario in just under 6h 19m. Your travel time can differ by up to 1h 31m. 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 $351. Users have found that American Airlines is 36% 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, March is the cheapest month in which you can book a flight from Greenville to Ontario (average of $96). Flying from Greenville to Ontario in February is currently the most expensive (average of $246). 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
Charleston to Las Vegas flights
Charlotte to San Diego flights
Charlotte to Ontario flights
Charlotte to Santa Ana flights
Greenville to Las Vegas flights
Myrtle Beach to Las Vegas flights
Columbia to Las Vegas flights
Charleston to San Francisco flights
Augusta to Las Vegas flights
Savannah to Las Vegas flights
Greenville to San Francisco flights
Savannah to San Francisco flights
Savannah to San Diego flights
Greenville to Los Angeles flights
Charlotte to Sacramento flights
Charlotte to Reno flights
Charlotte to San Jose flights
Charleston to Los Angeles flights
Augusta to Los Angeles flights
Charleston to San Diego flights
Charlotte to Burbank flights
Columbia to Los Angeles flights
Myrtle Beach to Los Angeles flights
Columbia to San Francisco flights
Greenville to Santa Ana flights
Charleston to Reno flights
Savannah to Los Angeles flights
Charlotte to Palm Springs flights
Greenville to San Diego flights
Columbia to San Diego flights
Charlotte to Medford flights
Charleston to Ontario flights
Charlotte to Fresno flights
Charlotte to San Luis Obispo flights
Greenville to Reno flights
Greenville to San Jose flights
Charlotte to Santa Barbara flights
Myrtle Beach to Reno flights
Charleston to Fresno flights
Savannah to Ontario flights
Savannah to Santa Ana flights
Augusta to San Diego flights
Augusta to San Francisco flights
Charlotte to Oakland flights
Charleston to Sacramento flights
Greenville to Sacramento 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 April 4, 2026.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest$312Average$450FlexibilityNo cancel feeOn-time71%
DeltaCheapest$351Average$432FlexibilityNo 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.