ONT - GSP

$165 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 2/8. 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, 0 bags

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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41,299,237 searches in the past 7 days on KAYAK

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Everything you should know

Cheapest round-trip
$377
Overall average: $593
United Airlines
Wed 2/11Sat 2/14
ONT - GSP • 1 stop
Cheapest one-way
$165
Typical prices: $372-$572
Multiple Airlines
Sun 2/8
ONT - GSP • 3 stops
Top airlines
American Airlines
Cheapest • from $404 (round-trip)
Delta
Best reviews • 7.9 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
When to travel
October
Cheapest • 34% 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

Wed, Feb 11 - Sat, Feb 14
United Airlines Logo
5:05 am - 3:20 pm
ONT
-
GSP
7h 15m1 stop
United Airlines Logo
4:16 pm - 8:50 pm
GSP
-
ONT
7h 34m1 stop
$377United Airlines
Wed, Feb 11 - Sat, Feb 14
Southwest Logo
5:45 pm - 10:10 am
ONT
-
GSP
13h 25m2 stops
Southwest Logo
10:35 am - 3:45 pm
GSP
-
ONT
8h 10m1 stop
$382Southwest
Wed, Feb 11 - Sat, Feb 14
United Airlines Logo
5:05 am - 8:47 pm
ONT
-
GSP
12h 42m2 stops
United Airlines Logo
6:30 am - 5:41 pm
GSP
-
ONT
14h 11m2 stops
$388United Airlines
Tue, Mar 17 - Tue, Mar 24
American Airlines Logo
10:56 am - 10:45 pm
ONT
-
GSP
8h 49m1 stop
American Airlines Logo
3:28 pm - 7:45 pm
GSP
-
ONT
7h 17m1 stop
$393American Airlines
Tue, Mar 17 - Tue, Mar 24
American Airlines Logo
9:53 am - 10:45 pm
ONT
-
GSP
9h 52m2 stops
American Airlines Logo
3:28 pm - 7:45 pm
GSP
-
ONT
7h 17m1 stop
$398American Airlines
Tue, Mar 17 - Tue, Mar 24
American Airlines Logo
11:58 pm - 12:15 pm
ONT
-
GSP
9h 17m2 stops
American Airlines Logo
5:20 am - 11:28 am
GSP
-
ONT
9h 08m2 stops
$404American Airlines
Thu, Feb 19 - Sun, Feb 22
American Airlines Logo
11:58 pm - 1:49 pm
ONT
-
GSP
10h 51m2 stops
American Airlines Logo
2:19 pm - 9:24 pm
GSP
-
ONT
10h 05m1 stop
$425American Airlines
Thu, Feb 19 - Sun, Feb 22
American Airlines Logo
11:58 pm - 11:36 am
ONT
-
GSP
8h 38m1 stop
American Airlines Logo
2:19 pm - 9:24 pm
GSP
-
ONT
10h 05m1 stop
$438American Airlines
Sat, May 2 - Thu, May 14
Delta Logo
10:15 pm - 9:02 am
ONT
-
GSP
7h 47m1 stop
Delta Logo
2:25 pm - 6:15 pm
GSP
-
ONT
6h 50m1 stop
$439Delta
Fri, May 1 - Wed, May 13
Delta Logo
10:15 pm - 9:02 am
ONT
-
GSP
7h 47m1 stop
Delta Logo
3:42 pm - 10:09 pm
GSP
-
ONT
9h 27m1 stop
$443Delta
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 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 October, where tickets cost $283 (return) on average. On the other hand, the most expensive months are February and July, where the average cost of round-trip tickets is $593 and $496 respectively.

Good to know

Low seasonJuly
Cheapest flight$165
Best time to beat the crowds but there is an average 15% increase in price.
Most popular time to fly and prices are also 6% 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 $165 for a one-way ticket and $377 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 $492 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 $402 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 8038 reviews
8.5Crew
7.2Food
8.1Boarding
7.9Comfort
7.8Entertainment
Airline reviews

The flight was delayed for about 2 hrs. Other than it, it was good.

8.0 ExcellentWen, Dec 2025
LAX - MSY
Read more Delta reviews

The flight was delayed for about 2 hrs. Other than it, it was good.

I am extremely disappointed that delta internal pilot manuals now refer to the Gulf of Mexico as the “gulf of America”. You can bow down to the Orange turd on your own. I will never fly delta again

No lunch on a x-country flight scheduled for 10:50 am departure, arrived 5+ hrs later. That requires a black box label before you pay for the tickets. Worst, when I checked in online, it's specifically said that lunch was served on his flight for economy Plus passengers.

Our flight from SFO to MSP was right on time on 11/15/2025. No delays. As we approached MSP at about 8 pm, we circled in the air until 8:40 pm so I don't call that efficient for MSP. I think the captain should announce the delay and why. (as if we all don't know that we are just circling around the area, slowing down, speeding up, slowing down.) Thank you. Marilyn Fischer

Staff were friendly and happy. Delta could make sure passengers that don't have the app know of changes. Without Kayak I would not have known about the change of gate or the delay. Kayak was faster to notify me.

The flight used a B767 with a very old interior from before 2014. The entertainment system did not work at all during the flight despite attempts to reset the system. It was like they flew this route just to be competitive.

Delayed flight (1hour) plus a long layover after an overnight flight with no backup plane available.

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.

The flight was on time and arrived early. The crew were friendly and helpful.

Overall experience was great. Flights were almost on time in departing and we arrived at our destination as scheduled. No issues with amenities or flight crew. Everything went well as as expected. Will fly again with American Airlines in the future!

Horrible. Both legs of my flight were delayed more than 6 hours. No compensation, no screens on the plane, and the plane was not clean.

The flight was smooth, the pilot kept us informed about delays and we arrived more of less on time

The flight was flawless and we even arrived between 20 and 25 minutes early!

Poor seat in rear of aircraft Food at Admiral’s Club Terminal D at DFW inedible

Always seated jammed in rear of aircraft Admirals Club food at DFW terminal D was absolute worst food experience and I pay $600/year to eat this dried out junk

Mostly good. Flight was crowded but Airline personnel were very friendly & accommodating. It would be good to have savory snacks rather than just sweet Biscoff cookies.

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.

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

Information on your arrival and departure airports