ONT - GSP

$180 Find Cheap Flights from Ontario to Greenville

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Ontario to Greenville departing on 12/11. 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 Greenville

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

Cheapest round-trip
$359
Overall average: $356
United Airlines
Tue 11/4Tue 11/11
ONT - GSP • 1 stop
Cheapest one-way
$180
Typical prices: $208-$420
Delta
Thu 12/11
ONT - GSP • 1 stop
Top airlines
United Airlines
Cheapest • from $359 (round-trip)
Delta
Best reviews • 7.9 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
When to travel
September
Cheapest • 28% price drop
May
Most popular
Good to know
Good to know
+1
+1
Good to know
Good to know
+1
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KAYAK searches 100s of sites at once to find you the best travel deals.
We hope you love your trip to Greenville!
Flight Deals
Booking Insights
Flight Deals

Cheap Flights from Ontario to Greenville (ONT-GSP)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Ontario to Greenville 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 Ontario to Greenville

Tue, Nov 4 - Tue, Nov 11
United Airlines Logo
5:05 am - 2:59 pmONT-GSP
6h 54m1 stop
United Airlines Logo
4:56 pm - 9:49 pmGSP-ONT
7h 53m1 stop
$359United Airlines
Find Deal
Tue, Nov 4 - Tue, Nov 11
Southwest Logo
5:25 am - 2:30 pmONT-GSP
6h 05m1 stop
Southwest Logo
7:40 am - 2:30 pmGSP-ONT
9h 50m2 stops
$364Southwest
Find Deal
Tue, Nov 4 - Tue, Nov 11
Southwest Logo
5:45 am - 7:40 pmONT-GSP
10h 55m2 stops
Southwest Logo
7:40 am - 2:30 pmGSP-ONT
9h 50m2 stops
$369Southwest
Find Deal
Thu, Jan 22 - Sun, Jan 25
American Airlines Logo
9:59 am - 11:57 pmONT-GSP
10h 58m2 stops
American Airlines Logo
4:40 pm - 10:49 pmGSP-ONT
9h 09m1 stop
$408American Airlines
Find Deal
Thu, Jan 22 - Sun, Jan 25
American Airlines Logo
11:59 pm - 3:19 pmONT-GSP
12h 20m2 stops
American Airlines Logo
10:32 am - 6:45 pmGSP-ONT
11h 13m2 stops
$413American Airlines
Find Deal
Mon, Dec 15 - Fri, Dec 19
Southwest Logo
5:25 am - 2:30 pmONT-GSP
6h 05m1 stop
Southwest Logo
7:40 am - 4:45 pmGSP-ONT
12h 05m2 stops
$418Southwest
Find Deal
Mon, Dec 15 - Fri, Dec 19
Southwest Logo
6:30 pm - 10:00 amONT-GSP
12h 30m2 stops
Southwest Logo
7:40 am - 4:45 pmGSP-ONT
12h 05m2 stops
$423Southwest
Find Deal
Wed, Oct 22 - Wed, Oct 29
Delta Logo
10:00 pm - 8:59 amONT-GSP
7h 59m1 stop
Delta Logo
6:35 am - 10:26 amGSP-ONT
6h 51m1 stop
$432Delta
Find Deal
Thu, Jan 22 - Sun, Jan 25
American Airlines Logo
10:58 am - 8:56 pmONT-GSP
6h 58m1 stop
American Airlines Logo
4:40 pm - 10:49 pmGSP-ONT
9h 09m1 stop
$443American Airlines
Find Deal
Fri, Oct 24 - Fri, Oct 31
Delta Logo
10:00 pm - 8:59 amONT-GSP
7h 59m1 stop
Delta Logo
6:35 am - 10:26 amGSP-ONT
6h 51m1 stop
$493Delta
Find Deal
Booking Insights

KAYAK's insights & trends for Ontario to Greenville flights

Get data-powered insights and trends into flights from Ontario to Greenville 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 Ontario to Greenville?

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

If your flying dates are flexible, you should consider flying to Greenville on a Saturday, as we generally find the cheapest rates on that day for this route. On the other hand, Sunday is the most expensive day to fly from Ontario to Greenville. For your return ticket, we recommend flying on a Friday and avoiding Mondays for the best deals.

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

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from Ontario to Greenville, 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 Ontario to Greenville is September, where tickets cost $302 (return) on average. On the other hand, the most expensive months are February and July, where the average cost of round-trip tickets is $562 and $496 respectively.

Good to know

Low seasonJuly
Cheapest flight$180
Best time to beat the crowds but there is an average 18% increase in price.
Most popular time to fly and prices are also 3% lower on average.
Flight from Ontario to Greenville

When to book flights from Ontario to Greenville

Are your dates flexible? Find out the best times to travel from Ontario to Greenville 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 Ontario to Greenville

  • What is the cheapest flight from Ontario to Greenville?

    In the last 3 days, the lowest price for a flight from Ontario to Greenville was $180 for a one-way ticket and $359 for a round-trip.

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

    No, a passport isn't needed to fly from Ontario to Greenville. However, local authorities might ask for an official ID.

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

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

  • Which airline alliances offer flights from Ontario to Greenville?

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

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

    The two airlines most popular with KAYAK users for flights from Ontario to Greenville are Delta and American Airlines. With an average price for the route of $538 and an overall rating of 7.9, Delta is the most popular choice. American Airlines is also a great choice for the route, with an average price of $399 and an overall rating of 7.2.

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

    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 Ontario to Greenville.

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

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Greenville from Ontario 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 Ontario to Greenville?

    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 Greenville with an airline and back to Ontario with another airline. Booking your flights between Ontario and GSP 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 Ontario to Greenville?

    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 Greenville from Ontario 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 Ontario to Greenville

 
See real verified KAYAK customer reviews for airlines flying from Ontario to Greenville. 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 Ontario to Greenville? 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.
7.9
DeltaOverall score based on 7969 reviews
7.9Comfort
7.9Entertainment
8.2Boarding
7.3Food
8.5Crew
Airline reviews

Flight delayed for two and half hours and then canceled altogether due to mechanical issues. No mechanic onsite to fix so had to send one from LAX.

2.0 MediocreAnonymous, Sep 2025SNA - SEA
Read more Delta reviews

Flight delayed for two and half hours and then canceled altogether due to mechanical issues. No mechanic onsite to fix so had to send one from LAX.

My husband upgraded our seats and I don't know if it was due to the type of planet was or if they didn't upgrade our seats. We were supposed to be in I believe comfort seats and they were just as tight as any other seat- no leg room and we are very tall people but at least it wasn't extremely cold. My husband did put in a complaint about our seating because he paid extra and if we would have known that the space and the tightness would have been the same, we just would have gotten the emergency row emergency row seats that we normally get. We love Delta but both our flights coming home we're not good. Oh I forgot to mention that on our flight to Hawaii our luggage wheels got broke and we had to purse new luggage on vacation then we never had this problem so we didn't know protocol and reported it after we got home only for them to tell is we only had 24hrs to report the damage. Not sure what was going on with Delta this vacation trip.

Crew was excellent. Comfort seats not as nice as other kinds of planes.

It was a great flight and the stewards and stewardess were all kind and accommodating!! The seats were comfortable and entertainment screen excellent!

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

There was a security issue at the airport and we were unable to land. We circled endlessly and then landed at another airfield for fuel. We then circled the airport again, almost landed but didn’t fully touch down before circling again. I am thankful to the crew for keeping us safe- the issue was the airline and staff at the airport getting us seats on our connecting flights. That part was hours of searching for someone and getting in double my steps.

Most aspects were good however if they assign boarding zones they ought to enforce them or why bother? My luggage from SAN-JFK-MAD was lost in NY so I without my main bag for two days upon arrival in Spain. They were helpful in tracking it and eventually delivered it to my hotel. The flub was because of a delay upon arrival in NYC. I had booked 2 1/2 hours between flights but we had to hold on the taxiway for an hour after landing while waiting for a clear gate which likely caused the baggage error.

Excellent flight, the planes were newer, they did a nice job with boarding, great service overall.

It would be nice if was given wires ear buds. Overall was a good experience was able to sleep on the plane

737-800 in first class was pretty dumpy. Seat had an uncomfortable angle, storage under the seat was blocked so even my very modest backpack didn't fit, power outlet was flaky. Weird tiny seat pockets that couldn't hold a gallon ziploc bag, emesis bag missing, etc. etc. No in-flight service due to turbulence. Crew was excellent, boarding was smooth despite a full flight.

It was a red eye flight, so no meals were provided, but it was fine with snacks. The seats felt cramped and almost too narrow.

Very crowded flight but what can you expect these days?? Crew was accommodating.

The seats in economy were appeared to be quite thin and lack sufficient cushioning to be comfortable. Perhaps it was my seating position but the plane seemed notably load.

The entertainment package was vast and the selections were very current. Keep updating it was great.

The seat was so hard my tailbone was aching The crew was kind of a b**** because I made a joke that I didn't care if they close the door I total c*** when she was trying to f****** act like she was mad at me because I said that The flight was bumpy. Sure you didnt have control over that.

4 hours late, including over +1 hour waiting in plane to take off. Baggage left behind too.

While waiting to claim my checked luggage, I discovered the airline had lost it. After a long wait and inquiries, I discovered it was on another flight. Fortunately, the airline finally sent my luggage home.

Was not able to watch most shows on the entertainment site. They would not load

Our flight was 1.5 hours delayed. There was no weather for the inbound flight, so I don't understand why. This meant a VERY late arrival and only a quick nap before my morning flight.

Delayed flight, so I switched fights to SFO to Phoenix , Phoenix to DSM. Excellent service through American Airlines

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

Information on your arrival and departure airports

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