GSP - ONT

$176 Find Cheap Flights from Greenville to Ontario

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Greenville to Ontario departing on 12/9. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult
1 adult, Economy

KAYAK searches hundreds of travel sites at once for deals on flights to Ontario

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Greenville to Ontario, as well as popular online travel agencies
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Greenville to Ontario, as well as popular online travel agencies
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Flights Deals

Cheap Flights from Greenville to Ontario (GSP-ONT)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Greenville to Ontario that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from Greenville to Ontario

Wed, Aug 27 - Sun, Aug 31
Delta Logo
6:30 am - 10:35 amGSP-ONT
7h 05m1 stop
Delta Logo
7:05 am - 7:00 pmONT-GSP
8h 55m1 stop
$345Delta
Find Deal
Wed, Aug 27 - Sun, Aug 31
Delta Logo
6:30 am - 10:35 amGSP-ONT
7h 05m1 stop
Delta Logo
9:50 am - 10:24 pmONT-GSP
9h 34m2 stops
$350Delta
Find Deal
Thu, Aug 14 - Thu, Aug 21
Delta Logo
6:30 am - 10:35 amGSP-ONT
7h 05m1 stop
Delta Logo
11:45 am - 10:24 pmONT-GSP
7h 39m1 stop
$351Delta
Find Deal
Sat, Aug 2 - Mon, Aug 4
Delta Logo
5:30 am - 10:30 amGSP-ONT
8h 00m1 stop
Delta Logo
10:05 pm - 9:01 amONT-GSP
7h 56m1 stop
$354Delta
Find Deal
Wed, Aug 27 - Sun, Aug 31
Delta Logo
7:05 am - 4:08 pmGSP-ONT
12h 03m2 stops
Delta Logo
9:50 am - 11:59 pmONT-GSP
11h 09m2 stops
$355Delta
Find Deal
Fri, Aug 15 - Sat, Aug 23
United Airlines Logo
2:52 pm - 10:06 pmGSP-ONT
10h 14m2 stops
United Airlines Logo
6:04 am - 3:46 pmONT-GSP
6h 42m1 stop
$391United Airlines
Find Deal
Fri, Aug 1 - Sun, Aug 31
American Airlines Logo
4:07 pm - 10:10 pmGSP-ONT
9h 03m2 stops
American Airlines Logo
10:50 am - 10:17 pmONT-GSP
8h 27m1 stop
$395American Airlines
Find Deal
Fri, Aug 15 - Sat, Aug 23
American Airlines Logo
12:18 pm - 6:24 pmGSP-ONT
9h 06m2 stops
American Airlines Logo
6:10 am - 5:50 pmONT-GSP
8h 40m2 stops
$396American Airlines
Find Deal
Thu, Sep 11 - Wed, Sep 17
United Airlines Logo
4:30 pm - 8:43 pmGSP-ONT
7h 13m1 stop
United Airlines Logo
5:10 am - 3:00 pmONT-GSP
6h 50m1 stop
$451United Airlines
Find Deal
Thu, Sep 11 - Wed, Sep 17
Alaska Airlines Logo
11:26 am - 12:03 amGSP-ONT
15h 37m2 stops
Alaska Airlines Logo
3:06 pm - 10:19 amONT-GSP
16h 13m2 stops
$643Alaska Airlines
Find Deal
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KAYAK's insights & trends for Greenville to Ontario flights

Get data-powered insights and trends into flights from Greenville to Ontario to help you find the cheapest flights, the best time to fly and much more.

What’s the cheapest day of the week to fly from Greenville to Ontario?

The average price of all round-trip flights from Greenville to Ontario clicked on KAYAK for each day over the last 12 months.

Your flight ticket price will generally be cheaper if you fly to Ontario on a Friday and more expensive on a Monday. On your return trip to Greenville, you should consider flying back on a Saturday, and avoid Sundays for better deals.

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

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from Greenville to Ontario, removes the top 0.1% to account for outliers, and then takes the median of all values for each month.

The cheapest month for flights from Greenville to Ontario is February, where tickets cost $388 (return) on average. On the other hand, the most expensive months are November and January, where the average cost of round-trip tickets is $727 and $557 respectively.

Good to know

Low seasonSeptember
High seasonApril
Cheapest flight$176
Best time to beat the crowds with an average 14% drop in price.
Most popular time to fly and prices are also 11% lower on average.
Flight from Greenville to Ontario

When to book flights from Greenville to Ontario

Are your dates flexible? Find out the best times to travel from Greenville to Ontario based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated round-trip price
KAYAK looks at all historical flight data for each date to provide a predicted price for one-way trips or round-trips with a duration up to 40 days. While we try to provide actual minimum prices for each date, some prices are predictions and actual prices may differ.

FAQs for booking flights from Greenville to Ontario

  • What is the cheapest flight from Greenville to Ontario?

    In the last 3 days, the lowest price for a flight from Greenville to Ontario was $176 for a one-way ticket and $345 for a round-trip.

  • Do I need a passport to fly between Greenville and Ontario?

    Even though you are not required to have a passport, keep in mind that an official ID is needed to board the airplane.

  • Which aircraft models fly most regularly from Greenville to Ontario?

    We unfortunately don’t have that data for this specific route.

  • Which airline alliances offer flights from Greenville to Ontario?

    oneworld, SkyTeam, and Star Alliance are the airline alliances operating flights between Greenville and Ontario, with oneworld being the most commonly used for this route.

  • Which is the best airline for flights from Greenville to Ontario, Delta or American Airlines?

    The two airlines most popular with KAYAK users for flights from Greenville to Ontario are Delta and American Airlines. With an average price for the route of $512 and an overall rating of 8.0, Delta is the most popular choice. American Airlines is also a great choice for the route, with an average price of $453 and an overall rating of 7.2.

  • How does KAYAK find such low prices on flights from Greenville to Ontario?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Greenville to Ontario.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Greenville to Ontario?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Ontario from Greenville is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights from Greenville to Ontario?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to Ontario with an airline and back to Greenville with another airline. Booking your flights between Greenville and ONT can sometimes prove cheaper using this method.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Greenville to Ontario?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to Ontario from Greenville up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Reviews of the top airlines flying from Greenville to Ontario

 
See real verified KAYAK customer reviews for airlines flying from Greenville to Ontario. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with from Greenville to Ontario? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
8.0
DeltaOverall score based on 7982 reviews
8.2Boarding
7.9Entertainment
8.5Crew
7.3Food
7.9Comfort
Airline reviews

My flight was extremely cold. I had a jacket and a cover was left in each seat. The cover was extremely thin and I have a disability, fibromyalgia and arthrithis and AC air is the worst. I closed my vent and my husbands vent and it still was frigid. I asked the attendant if I could get another cover and she quickly almost dismissively and totally unconcerned stating, (I quote) (one per chair) and walked off so quickly that I didn't get a chance to explain to her that I literally have adisability. I didnt want to make a seen so I set on that flight for over 5 hours in pain, joints locking up and extremely uncomfortable. When my fibromyalgia flares up my joints not only ache but they will lock up also and it takes me days to get back to my regular self even though I take medication for it. I felt like it would not have hurt anyone at all for her to just give me an extra cover because I'm sure they have all types of medical issues in people that fly every day.

2.0 MediocreMrs., Jul 2025OGG - LAX
Read more Delta reviews

My flight was extremely cold. I had a jacket and a cover was left in each seat. The cover was extremely thin and I have a disability, fibromyalgia and arthrithis and AC air is the worst. I closed my vent and my husbands vent and it still was frigid. I asked the attendant if I could get another cover and she quickly almost dismissively and totally unconcerned stating, (I quote) (one per chair) and walked off so quickly that I didn't get a chance to explain to her that I literally have adisability. I didnt want to make a seen so I set on that flight for over 5 hours in pain, joints locking up and extremely uncomfortable. When my fibromyalgia flares up my joints not only ache but they will lock up also and it takes me days to get back to my regular self even though I take medication for it. I felt like it would not have hurt anyone at all for her to just give me an extra cover because I'm sure they have all types of medical issues in people that fly every day.

Not a "Delta" issue, but a JFK issue: We booked a connecting flight with 3 1/2 hours between to clearn immigration and customs. Our inbound flight (BCN to JFK) was on the taxiway 45 minutes which ate into our layover time. Immigtration was insanely quick with the CBP MPC app; however, clearing TSA (again, after we were ALREADY cleared in Spain on the inbound international flight) took over 95 minutes. This left us with 10 minutes before boarding the connecting flight (JFK to SAN) to walk to the far end of Terminal 4 and try to find food. We didn't find any food that could promise to serve us in under 10 minutes so we boarded the Delta flight after coming off a plance and an 8-hour flight knowing that we wouldn't be served any food on the next 5 1/2 hour flight. I feel like Delta needs to put pressure on the JFK TSA to open more screening stations (by our count, we saw only 5 scanners open and a line of - as we said - over 90 minutes. The insult is that we WERE ALREADY SCREENED through TSA, but as you come off one flight into the USA, you have to go through the whole process again. It seems like if you have a connecting flight, there should be a way to pass through immigration and customs without needing to return through TSA.

There are 4 flights in consecutive gates with about the same departure time. Two flights were boarding at the same time. One was delayed or boarding would be happening at the same time. I am not sure what Delta and LAX need to do to have a better layout at the end of Terminal 2

5 hours of delay that could've been much shorter if Delta had taken the 1 hour delay they imposed on the flight before boarding to run any of the plane checks required for flight to find the hydraulic issue that required nearly 3 hours to fix. $24 of meal credit buys a sandwich and a soft drink. Poor communication within the terminal about what gate we'd be re-boarding from and when we'd be re-boarding.

The entertainment and wifi mostly didn't work on this flight.

Terrible entertainment system - kept freezing and audio kept cutting out. Snacks were mediocre at best for a 5 hour flight.

I am still upset that my bag was lost on a recent trip to Rome ; we were inconvenienced and out €150 Euros ; delta has refused to reimburse us

This had nothing to do with Delta… The flights were on time and flawless. The service was excellent. We purchased seats in (aisle/middle) comfort plus since this was a cross country flight. Unfortunately, the woman seated at the window was 300+ pounds and, as might be expected, covered up about a third of the middle seat also. there was absolutely nothing that Delta could have done about that… I just don’t know what the answer should be. If you purchase a seat, you should should be able to use the entire seat and not just the portion that someone else is not sitting/oozing in. Disappointing…there should be something that could be done….I'm just not sure what solution could be.

The plane was old with small storage areas that had problems closing/latching and not enough storage for everyone, and worn, damaged seats. Service was great but feel a little unsafe on such well used planes.

Seats are much much more comfortable than United, which is what I usually fly

Boarding gate in Honolulu was staffed with a great clerk with a soothing voice despite the flight delay of over an hour. Flight attendants in the plane were all grumpy, not pleasant looking bunch. Their sour attitude showed throughout the flight. Inly able to get a select few movies started. Most of the movie links in the “free entertainment” did not work.

This was a horrible experience. For a first class experience, my chair was held together by 3M tape - and I have a photo. The crew weren’t very attentive, somewhat dismissive and forgot my drink and snack, the chair reclined about 3 inches on a 6-hour cross country flight. I was also not informed that there was no lounge available in Newark airport because of renovations, so all around this was one of the worst experiences and I would actively avoid both American and Alaska Air going forward.

Boarding was very efficient. Everyone got on board and we got on our way very quickly. It was frustrating that the entertainment app was not functioning properly. I was not able to activate some of the movies offered. The crew on this flight appears to be pretty grumpy. They had no smile on their faces. I felt like they were doing us a favor for being there.

Loved the staff, boarding and drink options! Wish the comfort of the seat could have been better nevertheless

Honestly, I haven’t flown American in years, probably due to the pandemic and my being unable to travel for certain periods in the last two years, but it was a good experience to dig out or obtain a new American Airlines account after many years of traveling for business with American in the past.

Long 5 hour and 45 min flight and only one drink service and cookie snack

One bottle of water and a package of cookies for comfort plus. We had to literally beg a flight attendant for an extra bottle of water later in the flight due to feeling dehydrated.

Flight boarded from Gate 39 at OGG, the farthest gate in the terminal. There were no Hawaiian themed amenities for the flight. The first class service was mediocre at best; I received not special welcome or recognition as an executive platinum member of American Advantage program. The flight attendants were more concerned with their cell phones than saying "thank you" to the passengers as we disembarked. Fortunately, the flight arrived at LAX a few minutes early.

Bigger seats. Board back to front! Disembark front to back!

Extraordinary service in business class, and very good breakfast and snacks. A really lovely flight.

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

Information on your arrival and departure airports

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