ONT - GSP

$202 Find Cheap Flights from Ontario to Greenville - Compare and Save

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 8/13. 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

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Everything you should know

Cheapest round-trip
$299
Typical prices: $312-$429
Delta
Fri 8/21Fri 8/28
ONT - GSP • 1 stop
Cheapest one-way
$202
Typical prices: $133-$549
Multiple Airlines
Thu 8/13
ONT - GSP • 3 stops
Top airlines
Cheapest • from $299 (round-trip)
Best reviews • 8.0 score
Airline reviews
Airline reviews
+1
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Airline reviews
Airline reviews
+1
Nonstop flights
Not available
There are currently no direct flights between Ontario and Greenville. You'll need at least 1 connection.
Insights
Insights
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Insights
Top layover airports
Cheapest • Avg $319 (round-trip)
Shortest trip • 6h 50m (one-way)
Insights
Insights
Insights
Insights
When to travel
Cheapest • 44% price drop
Most popular
Good to know
Good to know
+1
+1
Good to know
Good to know
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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

Fri, Aug 21 - Fri, Aug 28
Delta Logo
10:00 pm - 10:02 am
ONT
-
GSP
9h 02m
1 stop
Delta Logo
5:20 pm - 9:52 pm
GSP
-
ONT
7h 32m
1 stop
$299Delta
Mon, Aug 31 - Sat, Sep 5
Southwest Logo
10:00 am - 9:35 pm
ONT
-
GSP
8h 35m
1 stop
Southwest Logo
11:05 am - 2:30 pm
GSP
-
ONT
6h 25m
1 stop
$300Southwest
Mon, Aug 31 - Sat, Sep 5
Southwest Logo
5:15 am - 6:20 pm
ONT
-
GSP
10h 05m
2 stops
Southwest Logo
11:05 am - 2:30 pm
GSP
-
ONT
6h 25m
1 stop
$304Southwest
Mon, Sep 28 - Fri, Oct 2
Southwest Logo
7:00 am - 6:20 pm
ONT
-
GSP
8h 20m
2 stops
Southwest Logo
1:05 pm - 6:25 pm
GSP
-
ONT
8h 20m
1 stop
$305Southwest
Mon, Aug 24 - Mon, Aug 31
Southwest Logo
10:00 am - 9:35 pm
ONT
-
GSP
8h 35m
1 stop
Southwest Logo
7:00 am - 12:00 pm
GSP
-
ONT
8h 00m
2 stops
$306Southwest
Fri, Aug 21 - Fri, Aug 28
Southwest Logo
5:15 am - 6:20 pm
ONT
-
GSP
10h 05m
2 stops
Southwest Logo
7:00 am - 1:25 pm
GSP
-
ONT
9h 25m
2 stops
$309Southwest
Fri, Aug 21 - Fri, Aug 28
Southwest Logo
5:15 am - 6:20 pm
ONT
-
GSP
10h 05m
2 stops
Southwest Logo
7:00 am - 3:30 pm
GSP
-
ONT
11h 30m
1 stop
$310Southwest
Sat, Aug 15 - Sat, Aug 22
Southwest Logo
7:05 am - 5:30 pm
ONT
-
GSP
7h 25m
2 stops
Southwest Logo
11:05 am - 4:25 pm
GSP
-
ONT
8h 20m
2 stops
$311Southwest
Sat, Aug 15 - Sat, Aug 22
Southwest Logo
7:05 am - 5:30 pm
ONT
-
GSP
7h 25m
2 stops
Southwest Logo
11:05 am - 2:30 pm
GSP
-
ONT
6h 25m
1 stop
$337Southwest
Mon, Sep 28 - Fri, Oct 2
Southwest Logo
7:00 am - 6:20 pm
ONT
-
GSP
8h 20m
2 stops
Southwest Logo
1:05 pm - 7:40 pm
GSP
-
ONT
9h 35m
2 stops
$353Southwest
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.

How much is a round-trip flight from Ontario to Greenville?

This analysis is based on the cheapest round-trip price found on KAYAK in the last 12 months by searching for a flight from Ontario to Greenville departing in August.

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 December and February, where the average cost of round-trip tickets is $928 and $887 respectively.

Good to know

Low seasonMarch
Cheapest flight$202
Best time to beat the crowds with an average 20% drop in price.
Most popular time to fly and prices are also 42% 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 5 days, the lowest price for a flight from Ontario to Greenville was $202 for a one-way ticket and $299 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?

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

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

    The two airlines most popular with KAYAK users for flights from Ontario to Greenville are Southwest and Delta. With an average price for the route of $590 and an overall rating of 8.0, Southwest is the most popular choice. Delta is also a great choice for the route, with an average price of $446 and an overall rating of 7.8.

  • 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 4 airlines serving 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.
8.0
SouthwestOverall score based on 4249 reviews
8.6Crew
7.0Food
8.1Boarding
7.5Entertainment
8.0Comfort
Airline reviews

I think Southwest is the number one airline that anyone can fly I have flown for the first time Frontier and what a joke and their customer service United was a very strange experience I'm only sticking to Southwest from here on out for sure

10.0 Excellentkelly, Jul 2026
SFO - PHX
Read more Southwest reviews

I think Southwest is the number one airline that anyone can fly I have flown for the first time Frontier and what a joke and their customer service United was a very strange experience I'm only sticking to Southwest from here on out for sure

Great job Southwest! My family doesn't fly often but we felt safe the whole time.

Flight was delayed, full flight and I had to change gates. Southwest flights are always late later in the day.

Was fine, delayed and feels like southwest is always late

I'm glad it wasn't only 75% full because I could get a good seat

The entire experience from boarding to landing was amazing! The crew were very friendly. Will definitely be back.

Delayed flight, lack of information, boarding process is a mess as is the carryon luggage causing issues when leaving the plane….just a poor experience.

Comfortable. Easy. No problems. Just wish they had gf options for snacks.

Check-in, Boarding and flight were smooth. All the employees and crew was very nice and funny. They gave the kids crayons and workbooks to keep them occupied which was a big win. I’ve flown Southwest many times and that’s the first time I’ve seen that and it is a great addition.

I liked receiving attention from aged and well experienced flight attendants. I disliked the non-gluten-free snack but I brought my own so I was OK.

Flight was delayed before take off and at landing. Baggage took 20 minutes. Flight crew would not serve full soft drink and had to ask multiple times before receiving water.

For some reason, TSA Atlanta didn’t have my bag on the flight on time and they don’t have to provide Delta a reason for that.

I am still at the Airport! Delayed Delayed and Delyaed

The landing was the worst I’ve experienced with a flight.

It was last minute due to weather - considering - it was amazing! Good smiles, friendly staff and they were making sure we knew what was going on when and where.

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

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.

The flight was overbooked and the staff at the gate started calling for volunteers to drop out and offering incentives. That delayed the flight

There was no wifi even after my husband paid for wifi it wasn’t working. The plane looked and felt old.

Update the cabin with tv screens or at least music sources.

It was a short, comfortable flight. It did leave an hour late due to the pilot having to be replaced (family emergency) but that didn’t inconvenience myself & my friend. The situation was explained, eventually.

UA594 was delayed multiple times. I ended up getting picked up so I can make it in time for work 6AM on Monday, 7/6/2026

Boarded from a very small gate at LAX. Staff at gate had us line up, then waited 25 minutes to board without a word of explanation. Plane arrived on time then waited 20 minutes for a plane to vacate our gate. Majority of bags arrived after 15 minutes but it took an hour for a small number of remaining bags to be off-loaded despite my “priority” bag tag.

Great staff. Clean plane, but we were delayed for more than an hour due to maintenance issues and had to board another plane.

Lost one piece of luggage even though I checked in 2.5 hours before the flight

The boarding process on the departure from LA was rather slow even though I was in Group 1. For first class, I was not expecting to have to pay for Wi-fi but I did and then the wi-fi was spotty. The entree was surprisingly good and so that was a pleasant surprise. However, once I got to Houston, it was terrible. Unfortunately there was bad weather but the constant gate changes for my connecting flight was difficult to manage due to having to navigate back and forth between different terminals.

Service was professional and quick. Premium economy seat was comfortable given the class

The staff was extremely helpful and friendly at all times! They went above and beyond to get us into an earlier flight in San Diego to make our connection in SFO possible, because our original flight did actually not make it! I did so much appreciate the UA team and how they made this possible. We also didn’t have seats together on the long flight to Singapore, but they found us seats together last moment with no additional cost! Nobody sat next to us, so that we were able to sleep! Thanks to UA for improving their service and Underpricer for booking this trip! Please be careful: 1,5 hrs for transfer in San Francisco might not be enough time in the future

Seat pitch is horrible especially on the 15 hour flight. Gate crew at SFO was Outstanding. The flight crew was also great.

Awful. No counter attendants. No dinner offered due to delays.

Very turbulent flight, no drinks, very little service, unorganized boarding, gate changed multiple times

Ontario airport boarding was very easy to park and access, is clean and TSA took 10 minutes total. Check-in was a breeze and cruise was very nice.

Good flight, seated and had a water within 5 minutes. Crew was hospitable.

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

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

The chair cushions may need an upgrade. I have been noticing they are so worn out, thin so you’d sit in a dip 😄. Other than that, all was an enjoyable trip. Thanks AA!

VERY disappointed at the agent checking in my luggage. I know that the weight limit is 23 kg, a little over 50 pounds (50.71 pounds). Yet the agent kept repeating "50 pounds". So I said, the limit is 23 kg, and she had the audacity to say 'no, it is 22 kg!" Imagine my surprise. Was she ignorant or was she poorly trained? Not sure. The boarding process was pretty good. The speakers were loud enough so I still could hear them despite inconsiderate passengers continuing to speak while the announcements were going on. During the flight, the teenage girl sitting behind me kept pressing her feet to the back of my chair. I turned around several times, yet she did not get the hint. I did not make a fuss since I sense I had a bad streak that night with AA, so I just did the best I can to lean forward and not let that bother me.

Multiple gate changes and significant delay leaving DFW. Made for a late arrival

It was wonderful upgrading to first. Plane was so cold thou. Crew was great. Wish there was a food option in first for such a long flight. Doesnt matter the time of day. Chintzy.

In-flight Wi-Fi didn’t work and the flight was 25 minutes late. The Embraer plane I was on was pretty old and the tray table was broken.

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

Information on your arrival and departure airports