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Cheap Flights from Greenville-Spartanburg to Ontario International

Compare Greenville-Spartanburg to Ontario International flight deals

Find the cheapest month or even day of the year to fly to Ontario International

Book the best Ontario International fare with no extra fees

Flight deals from Greenville-Spartanburg to Ontario International

Looking for a cheap last-minute deal or the best return flight from Greenville-Spartanburg to Ontario International? Find the lowest prices on one-way and return tickets right here.
Ontario.R 3,047 per passenger.Departing Fri, 4 Jul.One-way flight with Delta.Outbound indirect flight with Delta, departs from Greenville-Spartanburg on Fri, 4 Jul, arriving in Ontario International.Price includes taxes and charges.From R 3,047, select.
Ontario.R 3,308 per passenger.Departing Sat, 16 Aug.One-way flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from Greenville-Spartanburg on Sat, 16 Aug, arriving in Ontario International.Price includes taxes and charges.From R 3,308, select.
Ontario.R 3,837 per passenger.Departing Thu, 11 Dec.One-way flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from Greenville-Spartanburg on Thu, 11 Dec, arriving in Ontario International.Price includes taxes and charges.From R 3,837, select.
Ontario.R 3,884 per passenger.Departing Fri, 19 Sep.One-way flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from Greenville-Spartanburg on Fri, 19 Sep, arriving in Ontario International.Price includes taxes and charges.From R 3,884, select.
Ontario.R 5,537 per passenger.Departing Fri, 10 Oct.One-way flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from Greenville-Spartanburg on Fri, 10 Oct, arriving in Ontario International.Price includes taxes and charges.From R 5,537, select.
Ontario.R 6,537 per passenger.Departing Wed, 25 Jun.One-way flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from Greenville-Spartanburg on Wed, 25 Jun, arriving in Ontario International.Price includes taxes and charges.From R 6,537, select.

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

We’re always keeping an eye on fares, so you can find the best one in seconds. It looks like Greenville-Spartanburg to Ontario International flights are currently cheapest in July.
Jun
from R 6,537
Jul
from R 3,047
Aug
from R 3,308
Sep
from R 3,884
Oct
from R 5,537
Nov
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Dec
from R 3,837
Jan
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Feb
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Mar
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Apr
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May
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Greenville-Spartanburg to Ontario International: Alternative routes

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

Greenville to Ontario: Flight information

The things to know before you go.
Cheapest flight foundR 3,047
Cheapest month to flyJuly

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

The best price we found for a return flight from Greenville-Spartanburg to Ontario International is R 6,831. 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 Greenville-Spartanburg to Ontario International. But we found flights with one or more stops from R 6,831.
As of June 2025, there are no flights flying from Greenville-Spartanburg to Ontario International.
The cheapest month to fly from Greenville-Spartanburg to Ontario International is usually June 2025.
After crunching the numbers on our flight calendar, we found that it's currently cheapest to fly from Greenville-Spartanburg Airport to Ontario International Airport on Wednesday, 20 August 2025.
No airlines currently offer direct flights between Greenville-Spartanburg Airport and Ontario International 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 Ontario International 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 Ontario is around 40 days in advance, so don’t leave your flight to the last minute.
Currently, Southwest Airlines offers the cheapest flight tickets to Ontario International.

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

  • Ontario's timezone is UTC-7, making Ontario three hours behind Greenville.

  • For a smooth journey, turn up at the airport two hours ahead of international flights and an hour before domestic departures. This will give you enough time to board your GSP to ONT flight.

  • Travelling during a peak month such as August? Public holidays and other popular seasons can mean longer queues at check-in and security. Be extra cautious and get there up to four hours ahead of international flights and two hours before a domestic departure.

  • Consider adding a stopover when booking your ticket from Greenville-Spartanburg International Airport to Ontario International Airport. Just deselect 'Direct flights only' to break up your journey, or even explore someplace new along the way. Here are some options between GSP and ONT:

    • Dallas/Fort Worth International Airport

    • George Bush Intercontinental Airport

    • Denver International Airport

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

  • The cheapest price we've found for a one-way Greenville-Spartanburg International Airport to Ontario International Airport flight is R 3,047. A return plane ticket is currently R 6,831. Depending on the availability when you book, these fares can change.

  • It's usually best to book early if you want to get cheap tickets from GSP to ONT. That's because airlines adjust prices based on demand, which tends to increase closer to the date of departure.

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

  • Cut down on the time spent looking for cheap flights from GSP to ONT by creating a Price Alert. You'll get an email or notification through the app when a special offer becomes available.

  • Pick your ideal departure and arrival times, airlines and number of stops with the filters. Alternatively, sort your results by 'Cheapest' to get the best deals on flights from Greenville-Spartanburg International Airport to Ontario International Airport.

Handy information about Greenville-Spartanburg International Airport (GSP)

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

  • 79.7% of flights taking off from Greenville-Spartanburg International Airport land at their destination on time.

  • Greenville-Spartanburg International Airport is about 27 kilometres from central Greenville. If you're driving, ride-sharing or catching a cab from the centre, it'll take 20 minutes or so to arrive, depending on the traffic.

  • Get your journey off to a stress-free start by staying near GSP. Whether you're catching an early flight from Greenville-Spartanburg International Airport to Ontario International Airport or just don't want to be rushed, these stays are ideal:

Arriving at Ontario International Airport (ONT)

Getting from Ontario International Airport (ONT) to central Ontario

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

  • Ontario International Airport to the centre of Ontario has a drive time of about 10 minutes. It's approximately 6 kilometres away.

  • If you're travelling by public transport, expect a journey time of about 1 hour 30 minutes.

When to fly to Ontario International Airport (ONT)

  • It's time to pick your travel dates for your flight from Greenville-Spartanburg International Airport to Ontario International Airport. August is the most popular month to head to Ontario. If you like a quieter vibe, go in May.

  • When reserving your flight from Greenville-Spartanburg International Airport to Ontario International Airport, consider the type of weather you enjoy. August is the warmest month in Ontario, with temperatures ranging from 15ºC (59ºF) to 35ºC (95ºF).

  • January sees average temperatures of between 4ºC (39ºF) and 23ºC (73ºF). Search for cheap tickets from GSP to ONT sometime around then if you like travelling in cooler conditions.

Explore more of United States

  • You've seen Ontario, now it's time to discover other corners of United States. Travel around 56 kilometres west to Los Angeles to tick off its leading attractions. From Griffith Observatory to The Broad and La Brea Tar Pits & Museum, you'll have a packed itinerary ahead.

  • San Diego is another sought-after destination in United States and is around 153 kilometres south of Ontario. No journey is complete without visiting San Diego Zoo, USS Midway Museum and SeaWorld San Diego.

Plan the rest of your trip from Greenville to Ontario

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