ONT - GSP

$220 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 7/9. 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

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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Flights 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, Jun 11 - Thu, Jun 19
American Airlines Logo
10:28 pm - 10:30 amONT-GSP
9h 02m1 stop
American Airlines Logo
5:51 pm - 11:02 pmGSP-ONT
8h 11m1 stop
$374American Airlines
Find Deal
Wed, Jun 11 - Thu, Jun 19
Delta Logo
5:50 pm - 9:00 amONT-GSP
12h 10m2 stops
Delta Logo
5:38 pm - 10:25 pmGSP-ONT
7h 47m1 stop
$379Delta
Find Deal
Thu, Aug 14 - Sun, Aug 17
American Airlines Logo
12:47 pm - 10:17 pmONT-GSP
6h 30m1 stop
American Airlines Logo
7:45 am - 11:53 amGSP-ONT
7h 08m1 stop
$406American Airlines
Find Deal
Thu, Aug 7 - Sun, Aug 10
Delta Logo
10:05 pm - 9:01 amONT-GSP
7h 56m1 stop
Delta Logo
5:30 am - 10:30 amGSP-ONT
8h 00m1 stop
$409Delta
Find Deal
Fri, May 30 - Tue, Jun 3
United Airlines Logo
5:10 am - 2:59 pmONT-GSP
6h 49m1 stop
United Airlines Logo
4:35 pm - 9:04 pmGSP-ONT
7h 29m1 stop
$433United Airlines
Find Deal
Fri, May 30 - Tue, Jun 3
United Airlines Logo
5:10 am - 2:59 pmONT-GSP
6h 49m1 stop
United Airlines Logo
9:30 am - 5:39 pmGSP-ONT
11h 09m2 stops
$438United Airlines
Find Deal
Tue, May 27 - Sat, Jun 7
Southwest Logo
5:45 am - 5:40 pmONT-GSP
8h 55m2 stops
Southwest Logo
3:25 pm - 11:15 pmGSP-ONT
10h 50m1 stop
$483Southwest
Find Deal
Tue, May 27 - Sat, Jun 7
Southwest Logo
5:30 am - 5:40 pmONT-GSP
9h 10m2 stops
Southwest Logo
3:25 pm - 11:00 pmGSP-ONT
10h 35m2 stops
$532Southwest
Find Deal
Tue, Sep 16 - Fri, Sep 26
Alaska Airlines Logo
7:22 pm - 10:56 amONT-GSP
12h 34m2 stops
Alaska Airlines Logo
11:27 am - 11:59 pmGSP-ONT
15h 32m2 stops
$613Alaska Airlines
Find Deal
Fri, Jul 11 - Wed, Jul 23
Alaska Airlines Logo
6:58 pm - 10:53 amONT-GSP
12h 55m2 stops
Alaska Airlines Logo
7:59 am - 6:04 pmGSP-ONT
13h 05m2 stops
$648Alaska Airlines
Find Deal
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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 October, where tickets cost $371 (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 $478 respectively.

Good to know

Low seasonJuly
High seasonMay
Cheapest flight$220
Best time to beat the crowds but there is an average 9% increase in price.
Most popular time to fly and prices are also 7% 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 $220 for a one-way ticket and $374 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, oneworld, and SkyTeam are the airline alliances operating flights between Ontario and Greenville, with oneworld 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 $505 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 $419 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.

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.
8.0
DeltaOverall score based on 7946 reviews
7.3Food
8.2Boarding
7.9Comfort
8.5Crew
7.9Entertainment
Airline reviews

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.

6.0 GoodWalter, May 2025ONT - SLC
Read more Delta reviews

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.

Delta flight was on time, seats were comfortable, and crew was nice.

Thank you for not flipping the plane on the run way. You guys get a 5 star rating for the flight!!!

Boarding is, as it always is… horrible. Gate lice. Slow moving zones. Too many people with carry ons

It was terrible, if they ran flights on time it would make a big difference.

Delta seems to be improving in many areas, except they are super bad with the food available. Bring back normal food service on long flights.

I actually received a notification from kayak on email but not one by text from Delta when my departure gait changed and I almost missed my flight

New boarding doesn't make sense. Filling front first is slow.

Delta flight was great from the check in all the way to arrival. However, I had a very bad experience. I requested a wheelchair and the wheelchair employee that went to pick me up from the plane in Boston to bring me to the baggage claims told me I have to pay him. I was under the impression that it was a free service and I usually give tips but the person forced me to pay and since I said no because I was upset with his demand when my daughter walked in to pick me up he demanded payment from my daughter who paid him thinking maybe now it is a charged service.

Horrible. Grateful to be alive but spent 13 hours at airport only to return back to my familys house and flight changed to next day. They tried to fix a part on plane, had no back up plane and after 10 hours , reattempted the flight and it STILL wasn't fixed. We got a meal voucher and rescheduled flight but there should be some other compensation for the 15 hours spent in airport

Eventless. It was a good flight and good crew. Can’t complaint.

Very helpful ground crew after an earlier flight delay and being rebooked on a different flight.

The plane was late and then sat on the runway for almost 45 minutes before taking off.

We kept being told that the flight was full and that all overhead compartments were full and therefore had to check in our hand luggage. We were some of the last people to board and noticed that there was still sufficient space in the overhead compartments. We were obliged to check in hand luggage when there was space and so had to wait at luggage retrieval which took a while to then noticed damage to our luggage - not a great experience!

This was an overnight flight. There was no meal service in first class, just a simple snack basket was offered along with beverages. There should have been some type of continental breakfast prior to arrival in PHL. As an Executive Platinum American Airlines Advantage member, I received no name recognition from the first class flight attendant. When disembarking at PHL, the flight attendants were more interested in their cell phones than saying "thank you" to the passengers as they disembarked.

The flight was quick and to the point. The crew just did their job w/o excessive talking and everything was just perfect.

Awkward carry on process. Forced to check all carry on. No overhead space of worthiness. Left delayed, but made up the time. Crew was amicable.

Amazingly comfy flight - I had upgraded for a reasonable price and it was worth it. The food also was good.

Had to wait on pilot and crew to depart and had to wait to arrive at the gate because they only had 2 crews working. Delays, delays....Planes just keep getting smaller and tighter and they nickle and dime for everything. When will an airline actually wake up and make flying more enjoyable?

I paid for what I got which was cheap, I brought my own entertainment. I knew what to expect, so I could be prepared. If you’re flying economy, check in early like me. I have no problems with my flight, was on time, staff were friendly, and overall good experience.

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

Information on your arrival and departure airports

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