ONT - GSP

$164 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 4/21. 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
Travelers love KAYAK
41,299,237 searches in the past 7 days on KAYAK

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Everything you should know

Cheapest round-trip
$423
Overall average: $496
Delta
Tue 4/7Mon 4/13
ONT - GSP • 1 stop
Cheapest one-way
$164
Typical prices: $271-$339
Delta
Tue 4/21
ONT - GSP • 1 stop
Top airlines
Delta
Cheapest • from $423 (round-trip)
Delta
Best reviews • 7.9 score
Airline reviews
Airline reviews
+1
+1
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
Insights
Insights
Top layover airports
Baltimore (BWI)
Cheapest • Avg $319 (round-trip)
Houston (HOU)
Shortest trip • 6h 05m (one-way)
Insights
Insights
Insights
Insights
When to travel
October
Cheapest • 35% price drop
May
Most popular
Good to know
Good to know
+1
+1
Good to know
Good to know
+1
Start a new search
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, Apr 7 - Mon, Apr 13
Delta Logo
10:25 pm - 9:26 am
ONT
-
GSP
8h 01m
1 stop
Delta Logo
5:23 pm - 9:00 pm
GSP
-
ONT
6h 37m
1 stop
$423Delta
Wed, Mar 25 - Fri, Mar 27
American Airlines Logo
6:00 am - 3:40 pm
ONT
-
GSP
6h 40m
1 stop
American Airlines Logo
4:30 pm - 10:30 pm
GSP
-
ONT
9h 00m
1 stop
$424American Airlines
Wed, Mar 25 - Fri, Mar 27
American Airlines Logo
6:00 am - 3:40 pm
ONT
-
GSP
6h 40m
1 stop
American Airlines Logo
4:30 pm - 10:30 pm
GSP
-
ONT
9h 00m
1 stop
$441American Airlines
Fri, Aug 21 - Thu, Aug 27
Delta Logo
12:00 pm - 9:25 pm
ONT
-
GSP
6h 25m
1 stop
Delta Logo
2:25 pm - 6:01 pm
GSP
-
ONT
6h 36m
1 stop
$447Delta
Wed, May 20 - Sun, May 24
American Airlines Logo
6:00 am - 4:21 pm
ONT
-
GSP
7h 21m
1 stop
American Airlines Logo
4:06 pm - 10:36 pm
GSP
-
ONT
9h 30m
1 stop
$450American Airlines
Fri, Aug 21 - Fri, Aug 28
Delta Logo
5:05 pm - 9:27 am
ONT
-
GSP
13h 22m
2 stops
Delta Logo
2:25 pm - 6:01 pm
GSP
-
ONT
6h 36m
1 stop
$452Delta
Wed, Mar 25 - Fri, Mar 27
American Airlines Logo
7:59 pm - 8:38 am
ONT
-
GSP
9h 39m
2 stops
American Airlines Logo
4:30 pm - 10:30 pm
GSP
-
ONT
9h 00m
1 stop
$457American Airlines
Fri, Aug 21 - Wed, Aug 26
Delta Logo
5:05 pm - 9:27 am
ONT
-
GSP
13h 22m
2 stops
Delta Logo
3:42 pm - 11:44 pm
GSP
-
ONT
11h 02m
2 stops
$458Delta
Tue, Apr 7 - Sat, Apr 11
Delta Logo
10:25 pm - 9:26 am
ONT
-
GSP
8h 01m
1 stop
Delta Logo
5:40 am - 11:47 am
GSP
-
ONT
9h 07m
1 stop
$465Delta
Wed, Jul 1 - Tue, Jul 7
American Airlines Logo
10:22 am - 10:57 pm
ONT
-
GSP
9h 35m
1 stop
American Airlines Logo
5:29 pm - 9:26 pm
GSP
-
ONT
6h 57m
1 stop
$466American Airlines
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 April, where the average cost of round-trip tickets is $674 and $496 respectively.

Good to know

Low seasonJanuary
Cheapest flight$164
Best time to beat the crowds with an average 4% drop 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 $164 for a one-way ticket and $423 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 $446 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 $403 and an overall rating of 7.1.

  • 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 8237 reviews
7.9Comfort
7.8Entertainment
8.5Crew
7.2Food
8.1Boarding
Airline reviews

Flight was delayed by 3-hours and their fix was… complimentary pretzels.

4.0 OkayJahmes, Feb 2026
LAX - MCO
Read more Delta reviews

Flight was delayed by 3-hours and their fix was… complimentary pretzels.

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

The crew, and fellow passengers, were super gracious and kind. There seemed to be plenty of bin space even though the plane was full. It’s nice to get a glass of wine with dinner in Premiere seating, and there was a lot of food.

Everything I mentioned earlier - the airbus was more comfortable indeed and the experience was further enhanced.

The plane was an older model, so it wasn’t as comfortable as others. The flight attendants were not helpful during onboarding. It was a full flight so there was chaos finding space for baggage.

Awesome! On time flight, early arrival, and a complimentary upgrade!

Delta One is extraordinary. I fly business when somebody hires me. I just wonder why there is such a chasm between business class and the insanely inhumane and nonsensical coach. The seats are not large enough to fit even my tiny wife. We fly 10% of what we did because we don’t want to pay 5-10 k but for $400 it’s unbearable. It seems like the accountants took over and made stupid decisions. Screw in 20 extra seats and make it so unbearable that people fly 90% less. Just put the damn price up and put some proper chairs in. But business, yay.

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.

Delta’s staff is unmatched. From the gate agents, to the pilots, to the flight attendants… all top of the industry.

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

Experience was great. The best part is the free Wi-Fi connection which helps me to work on the flight

The flight was fine. It's the satellite terminal that supports American eagle flights is what sucks. There is only one food option and everything there is way overpriced. I mean I know it's airport pricing, but it's even crazier than that. I bought a sandwich in a plastic container for $18.

The flight was really crowded. Flight attendants were just ok.

Flight was delayed for 2 hours, then last minute the change to on time. The satélite location is far and a nightmare to get to.

We flew in first class. The crew did not offer drinks before the flight took off, but they treated us well during the flight. The food was excellent. There was actually too much food served, but it was nice to have all the options.

For a 5 1/2 hour flite i considered the "business class" to be subpar. The seats were just ok, no amenities, really nothing more than a long domestic flight. Frankly disappointed.

It would be nice to have some low carb options in the snacks.

The entertainment options were at best, fair. It was exactly the same as my outbound flight. It would have been more entertaining if there were some series from Apple TV, HBO, Showtime or other carriers for me to catch up with.

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!

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

Information on your arrival and departure airports