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$175+ 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 3/20. Fares are subject to change and may not be available on all flights or dates of travel.
GSP — ONT
Feb 9 — Feb 161
Sun 2/9
Sun 2/16
1 adult, Economy
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The best prices from Greenville to Ontario are usually found in February or March, booked 51 days in advance, depart on a Friday or Thursday and return on a Saturday

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 February 4, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$376
(American Airlines)

One-way from

$175
(American Airlines)

Popular in

November

Cheapest in

February

Average price

$388
Provider with most accurate pricing for Greenville-Ontario flight deals.
Search Deals
Provider most trusted by Cheapflights users for Greenville-Ontario flights.
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From Greenville to Ontario
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One-way flight from Greenville to Ontario
Search Deals
Highest demand for flights based on searches. 20% potential increase in price ($128 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 6% potential price decrease ($33 potential savings vs. average RT price).
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Average for round-trip flights in February 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 February 4, 2025.

This American Airlines deal was found by Cheapflights users on 2/3. 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.
Mon 3/107:47 pmGSP - ONT
1 stop7h 07mAmerican Airlines
Thu 3/1310:27 pmONT - GSP
1 stop7h 01mAmerican Airlines
Deal found 2/3$376
This United Airlines deal was found by Cheapflights users on 2/4. 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.
Tue 4/224:26 pmGSP - ONT
1 stop7h 16mUnited Airlines
Tue 4/295:00 amONT - GSP
1 stop7h 21mUnited Airlines
Deal found 2/4$489
This Delta deal was found by Cheapflights users on 2/4. 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.
Wed 2/197:14 amGSP - ONT
1 stop7h 41mDelta
Sat 2/227:05 amONT - GSP
1 stop5h 53mDelta
Deal found 2/4$527
This Southwest deal was found by Cheapflights users on 2/3. 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 6/2010:30 amGSP - ONT
2 stops12h 30mSouthwest
Fri 6/279:20 pmONT - GSP
1 stop9h 15mSouthwest
Deal found 2/3$659
This Alaska Airlines deal was found by Cheapflights users on 2/4. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/227:43 amGSP - ONT
2 stops15h 46mAlaska Airlines
Tue 4/296:00 amONT - GSP
2 stops12h 54mAlaska Airlines
Deal found 2/4$714

Find flights from Greenville to Ontario within your budget

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 February 4, 2025.

Fly from

Any airport

Fly to

Any airport

Route

Depart

Return

Price

GreenvilleOntario

GSP - ONT

GSPONT

Greenville

Mon 3/10

7:47 pm-11:54 pm

1 stop7h 07m

Ontario

Thu 3/13

10:27 pm-8:28 am

1 stop7h 01m

$376

GreenvilleOntario

GSP - ONT

GSPONT

Greenville

Tue 4/22

4:26 pm-8:42 pm

1 stop7h 16m

Ontario

Tue 4/29

5:00 am-3:21 pm

1 stop7h 21m

$489

GreenvilleOntario

GSP - ONT

GSPONT

Greenville

Wed 2/19

7:14 am-11:55 am

1 stop7h 41m

Ontario

Sat 2/22

7:05 am-3:58 pm

1 stop5h 53m

$527

GreenvilleOntario

GSP - ONT

GSPONT

Greenville

Fri 6/20

10:30 am-8:00 pm

2 stops12h 30m

Ontario

Fri 6/27

9:20 pm-9:35 am

1 stop9h 15m

$659

GreenvilleOntario

GSP - ONT

GSPONT

Greenville

Tue 4/22

7:43 am-8:29 pm

2 stops15h 46m

Ontario

Tue 4/29

6:00 am-9:54 pm

2 stops12h 54m

$714

GreenvilleOntario

GSP - ONT

GSPONT

Greenville

Thu 3/20

7:47 pm-11:54 pm

1 stop7h 07m

$175

GreenvilleOntario

GSP - ONT

GSPONT

Greenville

Thu 5/8

6:30 am-2:25 pm

2 stops10h 55m

$364

Flights are sorted by cheapest round-trip flights first.

Deals found on 2/3

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 February.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars
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 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.

Travel insights for flights from Greenville to Ontario

Get recent, data-driven insights about flights from Greenville to Ontario including ideal travel times, pricing trends, and more.

How far ahead should I book a flight from Greenville to Ontario?

Use this chart to determine the optimal time to book a round-trip flight from Greenville to Ontario. Price data was last updated on January 31, 2025.

Booking 51 days in advance of your planned departure date is, on average, the best time to get cheap flights from Greenville to Ontario. The general trend is that the closer you book to the departure date, the more expensive your flight will be.

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 $315). 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 February 4, 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.

Rainfall in Ontario by month

Plan your trip to Ontario by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Ontario ranges from 0.1 - 3.4 inches per month. February is typically the wettest month, when rainfall can reach 3.4 in. June is typically the driest time to visit Ontario when rainfall is around 0.1 in.

Temperature in Ontario by month

Plan your trip to Ontario by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Ontario, use this chart to help with planning. For those seeking warmer temperatures, August is the ideal time of year to visit, when temperatures reach an average of 78.8 F. Travelers looking to avoid the cold should look outside of December, when temperatures are typically at their lowest (around 53.6 F).

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 February 4, 2025.
Southwest
8.1
Very good
4,560 reviews

Comfort

8.1

Entertainment

7.7

Boarding

8.2

Crew

8.7

Food

7.1

Overall

8.1

Reviews

1 / 20

8.0
Excellent

Christine,Aug 2024

DEN - LGB

No issues. I needed pre boarding and I was able to get it without issue

Southwest
8.1
Very good
4,560 reviews
Southwest
8.1
Very good
4,560 reviews

Comfort

8.1

Entertainment

7.7

Boarding

8.2

Crew

8.7

Food

7.1

Overall

8.1

Reviews

1 / 20

8.0
Excellent

Christine,Aug 2024

DEN - LGB

No issues. I needed pre boarding and I was able to get it without issue

Alaska Airlines
8.0
Very good
9,678 reviews
Southwest
8.1
Very good
4,560 reviews

Comfort

8.1

Entertainment

7.7

Boarding

8.2

Crew

8.7

Food

7.1

Overall

8.1

Reviews

1 / 20

8.0
Excellent

Christine,Aug 2024

DEN - LGB

No issues. I needed pre boarding and I was able to get it without issue

Delta
8.0
Very good
8,408 reviews
Southwest
8.1
Very good
4,560 reviews

Comfort

8.1

Entertainment

7.7

Boarding

8.2

Crew

8.7

Food

7.1

Overall

8.1

Reviews

1 / 20

8.0
Excellent

Christine,Aug 2024

DEN - LGB

No issues. I needed pre boarding and I was able to get it without issue

United Airlines
7.4
Good
8,887 reviews
Southwest
8.1
Very good
4,560 reviews

Comfort

8.1

Entertainment

7.7

Boarding

8.2

Crew

8.7

Food

7.1

Overall

8.1

Reviews

1 / 20

8.0
Excellent

Christine,Aug 2024

DEN - LGB

No issues. I needed pre boarding and I was able to get it without issue

American Airlines
7.2
Good
10,000 reviews
Southwest
8.1
Very good
4,560 reviews

Comfort

8.1

Entertainment

7.7

Boarding

8.2

Crew

8.7

Food

7.1

Overall

8.1

Reviews

1 / 20

8.0
Excellent

Christine,Aug 2024

DEN - LGB

No issues. I needed pre boarding and I was able to get it without issue

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.

  • 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 $376 on this airline. Additional options worth looking into are United Airlines and Delta, starting at $489 and $527 round-trip. Users have found that American Airlines is 25% 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 $315). 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 February 4, 2025.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest$266Average$470FlexibilityNo cancel feeOn-time71%
DeltaCheapest$346Average$560FlexibilityNo cancel feeOn-timeN/A
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