What are the cheapest airlines flying from Ontario to Greenville round-trip?

According to our current data, United Airlines ($313), Delta ($323), and American Airlines ($385) offers the cheapest pricing from Ontario to Greenville. These flights start at 29% lower than the current average price 3 months from now.

What are the cheapest airlines to fly from Ontario to Greenville one-way?

One-way options have recently been found by users for as low as $157 on Delta. Other airlines that offer cheap prices include American Airlines from $225 and United Airlines from $269 one-way.

What is the cheapest day to fly from Ontario to Greenville?

Travelers seeking maximum savings on their Ontario to Greenville flight should consider departing on Saturday mornings when fares are most often at their lowest. Thursday mornings flights should be avoided if possible as fares are typically the most expensive at this time.

What is the cheapest day to fly round-trip from Ontario to Greenville?

Travelers have found that booking a Friday departure is the best way to save up to 51% on the cost of booking your flights compared to booking on days of the week where this route is of high demand.

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

When searching for a good deal, it’s best to be prepared for potential fluctuations in price. We recommend booking at least 51 days in advance, which can save you up to 205% on flights from Ontario to Greenville compared to booking the week you need them. Waiting 51 days out may not be for everyone, so we have options available for flights within the next two weeks, with the lowest price starting at $348. For sooner than that we have options available in the next 3 days from $348.

What is the cheapest month to fly from Ontario to Greenville?

May is one of the best times of the year to fly to Greenville from Ontario. Prices for May average $456 per person but you can even find prices for as low as $125. The most expensive prices can be found in the month of November. Opting for a May flight can save you 26% on your journey compared to booking in November

What is the cheapest time of day to fly from ONT to GSP?

One of the essential ways to save on airfare from Ontario to Greenville is to remain as flexible as possible. Flights that are in the morning tend to be the most expensive. A flight at noon could potentially save you up to 4% on airfare.

Most accurate provider : When it comes to deals on Ontario-Greenville flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Ontario-Greenville flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Ontario-Greenville flight searches over the past month and is updated monthly.

Most trusted provider : When it comes to deals on Ontario-Greenville 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 Ontario-Greenville flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

Can I find deals for flights from Ontario to Greenville that include hotel bookings?

Yes. In addition to deals on Ontario to Greenville flights, Cheapflights offers vacation packages that include both flights and hotel.

How can I find direct flights from Ontario to Greenville?

After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Ontario to Greenville.

Can I find deals for business class flights from Ontario to Greenville?

Yes. Cheapflights offers flight deals from Ontario to Greenville by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

$157+ Flights from Ontario to Greenville

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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

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Cheap flight deals from Ontario to Greenville

Most accurate provider	FlightHub 3 stars
Most trusted provider	eDreams 3 stars
Round-trip from	$313 (United Airlines)
One-way from	$157 (Delta)
Popular in	February
Cheapest in	October
Average price	$447

Provider with most accurate pricing for Ontario-Greenville flight deals.

Search Deals

Provider most trusted by Cheapflights users for Ontario-Greenville flights.

Search Deals

From Ontario to Greenville

Search Deals

One-way flight from Ontario to Greenville

Search Deals

Highest demand for flights based on searches. 4% potential increase in price ($21 potential increase over avg. RT price).

Search Deals

Cheapest flight prices on average. 2% potential price decrease ($11 potential savings vs. average RT price).

Search Deals

Average for round-trip flights in April 2025

Search Deals

Find flight deals from Ontario to Greenville

Cheapest flights from Ontario to Greenville
Explore the most affordable flight options available from Ontario to Greenville. Find the lowest fares from popular airlines and budget airlines, with prices last updated on abril 29, 2025.

mié. 6/116:00 amONT - GSP

1 stop6h 56mUnited Airlines

mar. 6/175:35 pmGSP - ONT

1 stop7h 51mUnited Airlines

Deal found 4/28

$313

mié. 6/115:50 pmONT - GSP

2 stops12h 10mDelta

mar. 6/1711:15 amGSP - ONT

2 stops14h 10mDelta

Deal found 4/28

$323

jue. 8/1412:47 pmONT - GSP

1 stop6h 30mAmerican Airlines

dom. 8/175:00 amGSP - ONT

2 stops10h 10mAmerican Airlines

Deal found 4/28

$385

sáb. 8/96:51 pmONT - GSP

2 stops13h 04mAlaska Airlines

sáb. 8/1611:29 amGSP - ONT

2 stops15h 44mAlaska Airlines

Deal found 4/28

$648

vie. 5/25:45 amONT - GSP

2 stops9h 50mSouthwest

dom. 5/45:10 pmGSP - ONT

2 stops9h 35mSouthwest

Deal found 4/28

$733

Best flights from Ontario to Greenville
Discover carefully curated flight deals from Ontario to Greenville that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated abril 29, 2025.

mié. 6/116:00 amONT - GSP

1 stop6h 56mUnited Airlines

mar. 6/175:35 pmGSP - ONT

1 stop7h 51mUnited Airlines

Deal found 4/28

$313

mié. 6/115:50 pmONT - GSP

2 stops12h 10mDelta

mar. 6/1711:15 amGSP - ONT

2 stops14h 10mDelta

Deal found 4/28

$323

jue. 8/1410:50 amONT - GSP

1 stop8h 27mAmerican Airlines

dom. 8/175:00 amGSP - ONT

2 stops10h 10mAmerican Airlines

Deal found 4/27

$385

vie. 6/139:20 pmONT - GSP

1 stop9h 15mSouthwest

vie. 6/205:45 amGSP - ONT

2 stops12h 00mSouthwest

Deal found 4/27

$482

lun. 9/157:22 pmONT - GSP

2 stops12h 34mAlaska Airlines

vie. 9/2612:24 pmGSP - ONT

2 stops14h 29mAlaska Airlines

Deal found 4/27

$648

Last-minute flights from Ontario to Greenville
Discover last-minute flight deals from Ontario to Greenville. Data last updated abril 29, 2025 and is based on user searches.

vie. 5/25:45 amONT - GSP

2 stops9h 50mSouthwest

dom. 5/45:10 pmGSP - ONT

2 stops9h 35mSouthwest

Deal found 4/28

$733

lun. 5/56:24 pmONT - GSP

2 stops13h 39mAlaska Airlines

lun. 5/1212:15 pmGSP - ONT

2 stops14h 43mAlaska Airlines

Deal found 4/28

$1,010

mié. 5/75:05 amONT - GSP

2 stops14h 55mUnited Airlines

mié. 5/214:12 pmGSP - ONT

1 stop8h 18mUnited Airlines

Deal found 4/28

$657

jue. 5/1511:59 pmONT - GSP

1 stop8h 45mAmerican Airlines

lun. 5/194:16 pmGSP - ONT

1 stop7h 49mAmerican Airlines

Deal found 4/28

$493

vie. 5/2312:18 pmONT - GSP

1 stop8h 34mDelta

lun. 5/265:30 amGSP - ONT

1 stop8h 38mDelta

Deal found 4/28

$433

mar. 5/275:10 amONT - GSP

1 stop6h 49mUnited Airlines

sáb. 6/145:35 pmGSP - ONT

1 stop7h 51mUnited Airlines

Deal found 4/28

$426

mar. 5/276:00 amONT - GSP

2 stops13h 43mAlaska Airlines

sáb. 6/1412:25 pmGSP - ONT

2 stops14h 48mAlaska Airlines

Deal found 4/28

$717

One-way flights from Ontario to Greenville
Search for one-way flight options from Ontario to Greenville. Find affordable one-way fares based on user searches. Data last updated abril 29, 2025.

mar. 6/1711:49 amONT - GSP

1 stop9h 08mDelta

Deal found 4/28

$157

lun. 6/1612:59 amONT - GSP

1 stop7h 53mAmerican Airlines

Deal found 4/28

$225

jue. 7/315:05 amONT - GSP

2 stops13h 55mUnited Airlines

Deal found 4/28

$269

mar. 5/66:00 amONT - GSP

2 stops12h 56mAlaska Airlines

Deal found 4/28

$395

Cheapflights Fare Finder

Use the filters below to find and compare flights from Ontario to Greenville that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

OntarioGreenville

ONT - GSP

ONTGSP

Ontario

mié. 6/11

6:00 am-3:56 pm

1 stop6h 56m

Greenville

mar. 6/17

5:35 pm-10:26 pm

1 stop7h 51m

$313

OntarioGreenville

ONT - GSP

ONTGSP

Ontario

mié. 6/11

5:50 pm-9:00 am

2 stops12h 10m

Greenville

mar. 6/17

11:15 am-10:25 pm

2 stops14h 10m

$323

OntarioGreenville

ONT - GSP

ONTGSP

Ontario

jue. 8/14

10:50 am-10:17 pm

1 stop8h 27m

Greenville

dom. 8/17

5:00 am-12:10 pm

2 stops10h 10m

$385

OntarioGreenville

ONT - GSP

ONTGSP

Ontario

vie. 6/13

9:20 pm-9:35 am

1 stop9h 15m

Greenville

vie. 6/20

5:45 am-2:45 pm

2 stops12h 00m

$482

OntarioGreenville

ONT - GSP

ONTGSP

Ontario

lun. 9/15

7:22 pm-10:56 am

2 stops12h 34m

Greenville

vie. 9/26

12:24 pm-11:53 pm

2 stops14h 29m

$648

OntarioGreenville

ONT - GSP

ONTGSP

Ontario

mar. 6/17

11:49 am-11:57 pm

1 stop9h 08m

$157

OntarioGreenville

ONT - GSP

ONTGSP

Ontario

lun. 6/2

10:40 pm-8:33 am

1 stop6h 53m

$176

OntarioGreenville

ONT - GSP

ONTGSP

Ontario

vie. 6/13

5:10 am-2:59 pm

1 stop6h 49m

$254

OntarioGreenville

ONT - GSP

ONTGSP

Ontario

dom. 5/4

6:00 am-10:52 pm

2 stops13h 52m

$417

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/28

Compare providers for flights from Ontario to Greenville

Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Ontario to Greenville in April.

Provider	Price Accuracy	Trust Score*
Expedia	Price Accuracy1 star	Trust Score*3 stars
FlightHub	Price Accuracy3 stars	Trust Score*2 stars
eDreams	Price Accuracy3 stars	Trust 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 Ontario-Greenville flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Ontario-Greenville flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Ontario-Greenville flight searches over the past month and is updated monthly.
Most trusted provider: When it comes to deals on Ontario-Greenville 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 Ontario-Greenville 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 Ontario to Greenville

Have a flexible travel schedule? Discover the best time to fly to Greenville from Ontario 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 Ontario to Greenville

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

Currently, January is the cheapest month in which you can book a flight from Ontario to Greenville (average of $329). Flying from Ontario to Greenville in March is currently the most expensive (average of $384). 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.

Rainfall in Greenville by month

In terms of precipitation, rainfall in Greenville ranges from 3.6 - 5.1 inches per month. March is typically the wettest month, when rainfall can reach 5.1 in. November is typically the driest time to visit Greenville when rainfall is around 3.6 in.

Temperature in Greenville by month

If weather is an important factor for your trip to Greenville, use this chart to help with planning. For those seeking warmer temperatures, July 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 January, when temperatures are typically at their lowest (around 41.0 F).

Reviews of airlines servicing Greenville

Read through reviews of airlines operating flights from Ontario to Greenville, such as Alaska Airlines, Southwest and Delta. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.

Alaska Airlines

8.0

Very good

9,949 reviews

Reviews

1 / 20

10.0

Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.

Alaska Airlines

8.0

Very good

9,949 reviews

Alaska Airlines

8.0

Very good

9,949 reviews

Reviews

1 / 20

10.0

Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.

Southwest

8.0

Very good

4,292 reviews

Alaska Airlines

8.0

Very good

9,949 reviews

Reviews

1 / 20

10.0

Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.

Delta

8.0

Very good

7,929 reviews

Alaska Airlines

8.0

Very good

9,949 reviews

Reviews

1 / 20

10.0

Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.

United Airlines

7.4

Good

8,696 reviews

Alaska Airlines

8.0

Very good

9,949 reviews

Reviews

1 / 20

10.0

Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.

American Airlines

7.2

Good

10,000 reviews

Alaska Airlines

8.0

Very good

9,949 reviews

Reviews

1 / 20

10.0

Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.

Related info for your journey

What are the cheapest airlines flying from Ontario to Greenville round-trip?
According to our current data, United Airlines ($313), Delta ($323), and American Airlines ($385) offers the cheapest pricing from Ontario to Greenville. These flights start at 29% lower than the current average price 3 months from now.
What are the cheapest airlines to fly from Ontario to Greenville one-way?
One-way options have recently been found by users for as low as $157 on Delta. Other airlines that offer cheap prices include American Airlines from $225 and United Airlines from $269 one-way.
Can I find deals for flights from Ontario to Greenville that include hotel bookings?
Yes. In addition to deals on Ontario to Greenville flights, Cheapflights offers vacation packages that include both flights and hotel.
How can I find direct flights from Ontario to Greenville?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Ontario to Greenville.
Can I find deals for business class flights from Ontario to Greenville?
Yes. Cheapflights offers flight deals from Ontario to Greenville 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 Ontario to Greenville?
Currently, January is the cheapest month in which you can book a flight from Ontario to Greenville (average of $329). Flying from Ontario to Greenville in March is currently the most expensive (average of $384). 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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Seneca

Duncan

Anderson

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Other flights to Greenville

Top 2 airlines flying from Ontario to Greenville

Airline	Cheapest	Average	Flexibility	On-time
Delta	Cheapest$336	Average$498	FlexibilityNo cancel fee	On-timeN/A
American Airlines	Cheapest$338	Average$422	FlexibilityNo cancel fee	On-time71%

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$157+ Cheap flights from Ontario to Greenville (ONT - GSP)

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 6/17. Fares are subject to change and may not be available on all flights or dates of travel.

Find cheap flights from Ontario to Greenville with Cheapflights

1. Tell us where you want to go

2. Select your favorite providers

3. Compare prices and book

Cheap flight deals from Ontario to Greenville

Most accurate provider

Most trusted provider

Round-trip from

One-way from

Popular in

Cheapest in

Average price

Find flight deals from Ontario to Greenville

Cheapest flights from Ontario to GreenvilleExplore the most affordable flight options available from Ontario to Greenville. Find the lowest fares from popular airlines and budget airlines, with prices last updated on abril 29, 2025.

Explore the most affordable flight options available from Ontario to Greenville. Find the lowest fares from popular airlines and budget airlines, with prices last updated on abril 29, 2025.

Cheapflights Fare Finder

Use the filters below to find and compare flights from Ontario to Greenville that are best for you.

Compare providers for flights from Ontario to Greenville

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 Ontario to Greenville in April.

Best time to book a flight from Ontario to Greenville

Have a flexible travel schedule? Discover the best time to fly to Greenville from Ontario with our price prediction graph.

Cheapflights Insights

Everything you need to know about your flight from Ontario to Greenville

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

Rainfall in Greenville by month

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

Temperature in Greenville by month

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

Reviews of airlines servicing Greenville

Read through reviews of airlines operating flights from Ontario to Greenville, such as Alaska Airlines, Southwest and Delta. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.

Related info for your journey

Find useful and relevant information for your journey from Ontario to Greenville. 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 Ontario to Greenville round-trip?

What are the cheapest airlines to fly from Ontario to Greenville one-way?

Can I find deals for flights from Ontario to Greenville that include hotel bookings?

How can I find direct flights from Ontario to Greenville?

Can I find deals for business class flights from Ontario to Greenville?

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

Traveling to a place near Ontario?

Browse thousands of different options on Cheapflights for your next trip

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Alternative routes for Ontario to Greenville

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Top 2 airlines flying from Ontario to Greenville

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Cheapest flights from Ontario to Greenville
Explore the most affordable flight options available from Ontario to Greenville. Find the lowest fares from popular airlines and budget airlines, with prices last updated on abril 29, 2025.