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Cheap Flights from Santa Rosa to Ontario International

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      Travellers and cabin class, 1 Adult, Economy

      Compare Santa Rosa 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 Santa Rosa to Ontario International

      Looking for a cheap last-minute deal or the best return flight from Santa Rosa Airport to Ontario International Airport? If you want to travel next month, return fares start from R 2,592. Find the lowest prices on one-way and return tickets right here.
      Ontario.R 1,296 per passenger.Departing Mon, 24 Aug.One-way flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from Santa Rosa on Mon, 24 Aug, arriving in Ontario International.Price includes taxes and charges.From R 1,296, select.
      Ontario.R 1,460 per passenger.Departing Wed, 2 Sep.One-way flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from Santa Rosa on Wed, 2 Sep, arriving in Ontario International.Price includes taxes and charges.From R 1,460, select.
      Ontario.R 2,429 per passenger.Departing Sun, 15 Nov.One-way flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from Santa Rosa on Sun, 15 Nov, arriving in Ontario International.Price includes taxes and charges.From R 2,429, select.
      Ontario.R 2,505 per passenger.Departing Thu, 21 Jan.One-way flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from Santa Rosa on Thu, 21 Jan, arriving in Ontario International.Price includes taxes and charges.From R 2,505, select.
      Ontario.R 2,510 per passenger.Departing Thu, 1 Oct.One-way flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from Santa Rosa on Thu, 1 Oct, arriving in Ontario International.Price includes taxes and charges.From R 2,510, select.
      Ontario.R 2,511 per passenger.Departing Tue, 28 Jul.One-way flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from Santa Rosa on Tue, 28 Jul, arriving in Ontario International.Price includes taxes and charges.From R 2,511, select.
      Ontario.R 2,919 per passenger.Departing Wed, 2 Dec.One-way flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from Santa Rosa on Wed, 2 Dec, arriving in Ontario International.Price includes taxes and charges.From R 2,919, select.

      Find the cheapest month to fly from Santa Rosa to Ontario International

      We’re always keeping an eye on fares, so you can find the best one in seconds. It looks like Santa Rosa to Ontario International flights are currently cheapest in August.
      Jul
      from R 2,511
      Aug
      from R 1,296
      Sep
      from R 1,460
      Oct
      from R 2,510
      Nov
      from R 2,429
      Dec
      from R 2,919
      Jan
      from R 2,505
      Feb
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      Mar
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      Apr
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      May
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      Jun
      Find prices

      Direct flights from Santa Rosa to Ontario International

      Santa Rosa to Ontario International: Alternative routes

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

      Ontario International

      4km from central Ontario
      Closest
      from R 1,296
      Search flights

      San Bernardino Norton AFB

      39km from central Ontario
      Search flights

      Santa Ana John Wayne

      48km from central Ontario
      from R 1,687
      Search flights

      Long Beach Municipal

      54km from central Ontario
      from R 3,995
      Search flights

      Hawthorne

      65km from central Ontario
      Search flights

      Burbank

      67km from central Ontario
      Cheapest
      from R 969
      Search flights

      Los Angeles International

      71km from central Ontario
      from R 1,373
      Search flights

      Santa Rosa to Ontario: Flight information

      The things to know before you go.
      Cheapest flight foundR 1,296
      Cheapest month to flyAugust
      Average flight time1 hr, 32 mins
      Most popular airlineAlaska Airlines
      Average flights per week16

      Finding cheap flights from Santa Rosa to Ontario International: Frequently asked questions

      The best price we found for a return flight from Santa Rosa to Ontario International is R 2,592. 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.
      1 hour and 32 minutes is the average flight time from Santa Rosa to Ontario International.
      Alaska Airlines, SkyWest Airlines and Horizon Air fly direct from Santa Rosa to Ontario International.
      As of July 2026, there are 16 flights per week flying from Santa Rosa to Ontario International.
      The cheapest month to fly from Santa Rosa to Ontario International is usually August.
      After crunching the numbers on our flight calendar, we found that it's currently cheapest to fly from Santa Rosa Airport to Ontario International Airport on Thursday, 20 August 2026.
      Yes – the average flight time is 1 hour and 32 minutes.
      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 and Alaska Airlines offer the cheapest flight tickets to Ontario International.

      Travelling from Santa Rosa Airport (STS) to Ontario International Airport (ONT): what you need to know

      • The average length of a direct flight from Santa Rosa Airport to Ontario International Airport is 1 hour 25 minutes.

      • Ontario's timezone is UTC-8, which is the same as Santa Rosa.

      • Each week, there are six Santa Rosa Airport to Ontario International Airport flights.

      • Get to the airport on time so you don't miss your STS to ONT flight. Be there at least two hours ahead for international flights and an hour early for domestic departures to avoid a last-minute sprint to the gate.

      • You can expect bigger queues during popular months like August. Arriving up to four hours in advance for an international flight and two hours for domestic departures is a wise move.

      • Flying into Ontario (and then seeing more of the United States!) is easy with Alaska Airlines. This popular carrier has direct flights from Santa Rosa Airport to Ontario International Airport.

      • Alaska Airlines tops the list for bookings on this route.

      • Opt for a stopover if you prefer to break up your flight. Just deselect 'Direct flights only' to see all your options for tickets from Santa Rosa Airport to Ontario International Airport. Dallas Fort Worth International Airport is a popular stopover on the STS to ONT route.

      How to find the cheapest flights from Santa Rosa Airport (STS) to Ontario International Airport (ONT)

      • The lowest price we've found for a one-way Santa Rosa Airport to Ontario International Airport flight is R 1,296. A return ticket right now is R 2,592. Depending on the availability and when you book, these fares could change.

      • To score cheap tickets from STS to ONT, book early. Airlines typically offer their most competitively priced fares when flights are first made available.

      • If you're flexible with your travel plans, use the 'Whole month' tool. It'll give you the lowest price across each month when looking for your flight from Santa Rosa Airport to Ontario International Airport.

      • Landing cheap flights from STS to ONT is a cinch with Price Alerts. Simply create one of these automatic alerts and we'll notify you as soon as a new discounted fare appears.

      • Tailor your trip using filters. Pick your arrival and departure times, total journey duration and airlines. You can also sort the results by 'Cheapest,' 'Best' or 'Fastest' flights from Santa Rosa Airport to Ontario International Airport.

      Handy information about Santa Rosa Airport (STS)

      • STS's address is 2200 Airport Boulevard.

      • Of all flights departing from Santa Rosa Airport, 71% arrive as scheduled at their destination.

      • Santa Rosa Airport is around 10 kilometres from central Santa Rosa. If you're catching a taxi, ride-sharing or driving from the centre, it'll take 10 minutes or so to get there, depending on the traffic.

      • The trip on public transport typically takes 35 minutes.

      • Catching an early flight from Santa Rosa Airport to Ontario International Airport? Avoid the stress of rushing to the airport (and sneak in some extra precious sleep) by choosing one of these hotels near STS:

      Arriving at Ontario International Airport (ONT)

      Getting from Ontario International Airport (ONT) to central Ontario

      • ONT is located at 2900 E. Airport Drive.

      • From Ontario International Airport, Ontario is approximately 10 kilometres away. It takes around 15 minutes to reach the centre driving.

      • It'll take around 45 minutes to get there by public transport.

      When to fly to Ontario International Airport (ONT)

      • It's time to work out your trip dates for your flight from Santa Rosa Airport to Ontario International Airport. July is the most popular month to visit Ontario. If you like a quieter vibe, go in March.

      • Book your flight from Santa Rosa Airport to Ontario International Airport for August if you'd like to explore Ontario during its warmest month. Expect temperatures of between 16ºC (61ºF) and 36ºC (97ºF).

      • If you'd rather travel in cooler conditions, look for a cheap ticket from STS to ONT in February. Average temperatures are between 4ºC (39ºF) and 24ºC (75ºF) then.

      Explore more of the United States

      • Los Angeles is just one of the many cities in the United States waiting to be explored after you've experienced Ontario. Around 56 kilometres away to the west, top sights here include Hollywood Sign, Universal Studios Hollywood and Hollywood Bowl.

      • San Diego is another well-known destination in the United States and is around 153 kilometres south of Ontario. No trip is complete without experiencing San Diego Zoo, San Diego Balboa Park and USS Midway Museum.

      Plan the rest of your trip from Santa Rosa to Ontario

      Prices shown on this page are estimated lowest prices only. Found in the last 12 days.