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Cheap flights from Ontario International to Greenville-Spartanburg

Compare Ontario International to Greenville-Spartanburg flight deals

Find the cheapest month or even day of the year to fly to Greenville-Spartanburg

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Flight deals from Ontario International to Greenville-Spartanburg

Looking for a cheap last-minute deal or the best round-trip flight from Ontario International Airport to Greenville-Spartanburg Airport? If you want to travel next month, round-trip fares start from $473. Find the lowest prices on one-way and round-trip tickets right here.
Greenville.$402 per passenger.Departing Wed, Aug 19, returning Wed, Aug 26.Round-trip flight with Delta.Outbound indirect flight with Delta, departing from Ontario International on Wed, Aug 19, arriving in Greenville-Spartanburg.Inbound indirect flight with Delta, departing from Greenville-Spartanburg on Wed, Aug 26, arriving in Ontario International.Price includes taxes and charges.From $402, select.
Greenville.$418 per passenger.Departing Tue, Jul 14, returning Tue, Jul 21.Round-trip flight with Delta.Outbound indirect flight with Delta, departing from Ontario International on Tue, Jul 14, arriving in Greenville-Spartanburg.Inbound indirect flight with Delta, departing from Greenville-Spartanburg on Tue, Jul 21, arriving in Ontario International.Price includes taxes and charges.From $418, select.
Greenville.$441 per passenger.Departing Sat, Nov 7, returning Mon, Nov 9.Round-trip flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departing from Ontario International on Sat, Nov 7, arriving in Greenville-Spartanburg.Inbound indirect flight with Southwest Airlines, departing from Greenville-Spartanburg on Mon, Nov 9, arriving in Ontario International.Price includes taxes and charges.From $441, select.
Greenville.$473 per passenger.Departing Thu, Jun 25, returning Mon, Jun 29.Round-trip flight with Frontier Airlines and Allegiant Air.Outbound indirect flight with Frontier Airlines, departing from Ontario International on Thu, Jun 25, arriving in Greenville-Spartanburg.Inbound indirect flight with Allegiant Air, departing from Greenville-Spartanburg on Mon, Jun 29, arriving in Ontario International.Price includes taxes and charges.From $473, select.
Greenville.$507 per passenger.Departing Mon, Jul 27, returning Fri, Aug 28.Round-trip flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departing from Ontario International on Mon, Jul 27, arriving in Greenville-Spartanburg.Inbound indirect flight with Southwest Airlines, departing from Greenville-Spartanburg on Fri, Aug 28, arriving in Ontario International.Price includes taxes and charges.From $507, select.
Greenville.$530 per passenger.Departing Wed, May 27, returning Tue, Jun 2.Round-trip flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departing from Ontario International on Wed, May 27, arriving in Greenville-Spartanburg.Inbound indirect flight with Southwest Airlines, departing from Greenville-Spartanburg on Tue, Jun 2, arriving in Ontario International.Price includes taxes and charges.From $530, select.
Greenville.$533 per passenger.Departing Wed, Oct 14, returning Wed, Oct 21.Round-trip flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departing from Ontario International on Wed, Oct 14, arriving in Greenville-Spartanburg.Inbound indirect flight with Southwest Airlines, departing from Greenville-Spartanburg on Wed, Oct 21, arriving in Ontario International.Price includes taxes and charges.From $533, select.
Greenville.$563 per passenger.Departing Thu, Sep 17, returning Tue, Sep 22.Round-trip flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departing from Ontario International on Thu, Sep 17, arriving in Greenville-Spartanburg.Inbound indirect flight with Southwest Airlines, departing from Greenville-Spartanburg on Tue, Sep 22, arriving in Ontario International.Price includes taxes and charges.From $563, select.
Greenville.$564 per passenger.Departing Thu, Aug 13, returning Fri, Dec 11.Round-trip flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departing from Ontario International on Thu, Aug 13, arriving in Greenville-Spartanburg.Inbound indirect flight with Southwest Airlines, departing from Greenville-Spartanburg on Fri, Dec 11, arriving in Ontario International.Price includes taxes and charges.From $564, select.
Greenville.$569 per passenger.Departing Sun, Dec 6, returning Thu, Dec 10.Round-trip flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departing from Ontario International on Sun, Dec 6, arriving in Greenville-Spartanburg.Inbound indirect flight with Southwest Airlines, departing from Greenville-Spartanburg on Thu, Dec 10, arriving in Ontario International.Price includes taxes and charges.From $569, select.
Greenville.$573 per passenger.Departing Fri, Sep 25, returning Fri, Oct 2.Round-trip flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departing from Ontario International on Fri, Sep 25, arriving in Greenville-Spartanburg.Inbound indirect flight with Southwest Airlines, departing from Greenville-Spartanburg on Fri, Oct 2, arriving in Ontario International.Price includes taxes and charges.From $573, select.
Greenville.$574 per passenger.Departing Sat, Jun 27, returning Sun, Jul 5.Round-trip flight with Frontier Airlines and Allegiant Air.Outbound indirect flight with Frontier Airlines, departing from Ontario International on Sat, Jun 27, arriving in Greenville-Spartanburg.Inbound indirect flight with Allegiant Air, departing from Greenville-Spartanburg on Sun, Jul 5, arriving in Ontario International.Price includes taxes and charges.From $574, select.
Greenville.$723 per passenger.Departing Mon, May 25, returning Fri, May 29.Round-trip flight with Frontier Airlines and Allegiant Air.Outbound indirect flight with Frontier Airlines, departing from Ontario International on Mon, May 25, arriving in Greenville-Spartanburg.Inbound indirect flight with Allegiant Air, departing from Greenville-Spartanburg on Fri, May 29, arriving in Ontario International.Price includes taxes and charges.From $723, select.

Find the cheapest month to fly from Ontario International to Greenville-Spartanburg

We’re always keeping an eye on fares, so you can find the best one in seconds. It looks like Ontario International to Greenville-Spartanburg flights are currently cheapest in August.
May
from $723
Jun
from $473
Jul
from $418
Aug
from $402
Sep
from $563
Oct
from $533
Nov
from $441
Dec
from $569
Jan
Find prices
Feb
Find prices
Mar
Find prices
Apr
Find prices

Ontario International to Greenville-Spartanburg: Alternative routes

Compare routes from Ontario International to Greenville below. You may find an airport to fly into that's cheaper, faster, or easier than Greenville-Spartanburg.

Greenville-Spartanburg

17km from central Greenville
Closest
from $402
Search flights

Asheville

66km from central Greenville
Cheapest
from $367
Search flights

Ontario to Greenville: Flight information

The things to know before you go.
Cheapest flight found$402
Cheapest month to flyAugust

Finding cheap flights from Ontario International to Greenville-Spartanburg: Frequently asked questions

The best price we found for a round-trip flight from Ontario International to Greenville-Spartanburg is $402. This is an estimate based on information collected from different airlines and travel providers over the last 4 days and is subject to change and availability.
Currently, there are no airlines that fly direct from Ontario International to Greenville-Spartanburg. But we found flights with one or more stops from $402.
There are no flights flying from Ontario International to Greenville-Spartanburg, as of May 2026.
The cheapest month to fly from Ontario International to Greenville-Spartanburg is usually August.
After crunching the numbers on our flight calendar, we found that it's currently cheapest to fly from Ontario International Airport to Greenville-Spartanburg Airport on Wednesday, August 19, 2026.
No airlines currently offer direct flights between Ontario International Airport and Greenville-Spartanburg Airport. Most routes have one or more stops.
We show every price from over 1,200 airlines and travel agents, comparing them all so you don’t have to. If you know you want to fly to Greenville-Spartanburg but you’re not ready to book, set up a Price Alert. We’ll track prices for you, and let you know when they rise or fall.
We crunched all the numbers in our flight calendar, and it looks like the cheapest time to book a flight to Greenville is around 40 days in advance, so don’t leave your flight to the last minute.
Currently, Delta offers the cheapest flight tickets to Greenville-Spartanburg.

Flying from Ontario International Airport (ONT) to Greenville-Spartanburg International Airport (GSP): what you need to know

  • Leave enough time to catch your ONT to GSP flight. It's generally best to arrive two hours before international departures and an hour ahead for domestic flights.

  • Be prepared for longer queues in popular months like August. Arriving up to four hours ahead of an international flight and two hours for a domestic departure is a wise move.

  • We make it easy to book a flight with a stopover. To see your options for tickets from Ontario International Airport to Greenville-Spartanburg International Airport, deselect 'Direct flights only.' Then, choose a flight offering a stop long enough to visit the city of your choice. Some great stopovers between ONT and GSP include:

    • Charlotte Douglas International Airport

    • Nashville International Airport

    • George Bush Intercontinental Airport

How to find the cheapest flights from Ontario International Airport (ONT) to Greenville-Spartanburg International Airport (GSP)

  • The cheapest price we've seen for a one-way Ontario International Airport to Greenville-Spartanburg International Airport flight is $201. A round-trip ticket is currently $402. Depending on the availability and when you book, these fares could change.

  • To pick up cheap tickets from ONT to GSP, book ahead. Airlines generally offer their most competitively priced fares when flights are first released.

  • If you're willing to be flexible with your travel dates, use the 'Whole month' search tool. It'll show you the lowest price across every month when looking for a flight from Ontario International Airport to Greenville-Spartanburg International Airport.

  • You don't need to check every day to see if fares have dropped when you set up a Price Alert. We'll send you an update as soon as the price changes on cheap flights from ONT to GSP.

  • Secure the ideal flight for you with the help of the filters. To see the 'Cheapest,' 'Best' or 'Fastest' flights from Ontario International Airport to Greenville-Spartanburg International Airport, use the 'Sort by' tool. You can also filter by airline, arrival and departure times, and number of stops.

Handy information about Ontario International Airport (ONT)

  • The address for ONT is 2900 E. Airport Drive.

  • Ontario International Airport gets top marks for on-time performance. 83.6% of flights that depart ONT arrive at their destination without delay.

  • To reach Ontario International Airport from central Ontario, it'll take around 10 minutes if you're going by car. Of course, this depends on traffic. It's approximately 6 kilometers from the airport to the city center.

  • Planning to take public transport? You can expect a journey time of around 1 hour 30 minutes.

  • Booked an early flight from Ontario International Airport to Greenville-Spartanburg International Airport? Avoid the hassle of rushing to the airport (and sneak in some extra snooze time) by picking one of these hotels near ONT:

Arriving at Greenville-Spartanburg International Airport (GSP)

Getting from Greenville-Spartanburg International Airport (GSP) to central Greenville

  • The street address for GSP is 2000 GPS Drive, Suite 1.

  • From Greenville-Spartanburg International Airport, Greenville is approximately 27 kilometers away. It takes around 20 minutes to reach the center driving.

When to fly to Greenville-Spartanburg International Airport (GSP)

  • The quietest month for a flight from Ontario International Airport to Greenville-Spartanburg International Airport is February, while August is the most popular. Choose the ideal time to go to Greenville based on whether you prefer a laid-back vibe or a more bustling atmosphere.

  • Lock in your flight from Ontario International Airport to Greenville-Spartanburg International Airport for July if you'd like to go to Greenville during its warmest month. Expect temperatures of between 19ºC (66ºF) and 34ºC (93ºF).

  • If you want to travel in cooler conditions, search for a cheap ticket from ONT to GSP in January. Temperatures average between -3ºC (27ºF) and 13ºC (55ºF) then.

Explore more of United States

  • Charlotte is just one of the many cities in United States waiting to be discovered once you've taken in the sights of Greenville. Around 145 kilometers away to the east, well-known attractions include NASCAR Hall of Fame, Freedom Park and Carolinas Aviation Museum.

  • Nashville is another standout destination in United States and is around 418 kilometers west of Greenville. No trip is complete without dropping by Grand Ole Opry, Country Music Hall of Fame and Museum and Ryman Auditorium.

More travel options

Prices shown on this page are estimated lowest prices only. Found in the last 45 days.