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134 € Cheap Flights from Ontario International to Santa Rosa

Compare Ontario International to Santa Rosa flight deals

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Flight deals from Ontario International to Santa Rosa

Looking for a cheap last-minute deal or the best return flight from Ontario International Airport to Santa Rosa Airport? If you want to travel next month, return fares start from 139 €. Find the lowest prices on one-way and return tickets right here.
Santa Rosa.134 € per passenger.Departing Sat, 30 May, returning Tue, 2 Jun.Return flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from Ontario International on Sat, 30 May, arriving in Santa Rosa.Inbound indirect flight with Southwest Airlines, departs from Santa Rosa on Tue, 2 Jun, arriving in Ontario International.Price includes taxes and charges.From 134 €, select.
Santa Rosa.138 € per passenger.Departing Sat, 30 May, returning Thu, 4 Jun.Return flight with Alaska Airlines.Outbound direct flight with Alaska Airlines departs from Ontario International on Sat, 30 May, arriving in Santa Rosa.Inbound direct flight with Alaska Airlines departs from Santa Rosa on Thu, 4 Jun, arriving in Ontario International.Price includes taxes and charges.From 138 €, select.
Santa Rosa.139 € per passenger.Departing Sat, 6 Jun, returning Mon, 8 Jun.Return flight with Alaska Airlines.Outbound direct flight with Alaska Airlines departs from Ontario International on Sat, 6 Jun, arriving in Santa Rosa.Inbound direct flight with Alaska Airlines departs from Santa Rosa on Mon, 8 Jun, arriving in Ontario International.Price includes taxes and charges.From 139 €, select.
Santa Rosa.184 € per passenger.Departing Wed, 15 Jul, returning Sun, 19 Jul.Return flight with Alaska Airlines.Outbound direct flight with Alaska Airlines departs from Ontario International on Wed, 15 Jul, arriving in Santa Rosa.Inbound direct flight with Alaska Airlines departs from Santa Rosa on Sun, 19 Jul, arriving in Ontario International.Price includes taxes and charges.From 184 €, select.
Santa Rosa.189 € per passenger.Departing Thu, 4 Jun, returning Wed, 1 Jul.Return flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from Ontario International on Thu, 4 Jun, arriving in Santa Rosa.Inbound indirect flight with Southwest Airlines, departs from Santa Rosa on Wed, 1 Jul, arriving in Ontario International.Price includes taxes and charges.From 189 €, select.
Santa Rosa.192 € per passenger.Departing Fri, 21 Aug, returning Mon, 24 Aug.Return flight with Alaska Airlines.Outbound direct flight with Alaska Airlines departs from Ontario International on Fri, 21 Aug, arriving in Santa Rosa.Inbound direct flight with Alaska Airlines departs from Santa Rosa on Mon, 24 Aug, arriving in Ontario International.Price includes taxes and charges.From 192 €, select.
Santa Rosa.193 € per passenger.Departing Sat, 25 Jul, returning Thu, 13 Aug.Return flight with Alaska Airlines.Outbound direct flight with Alaska Airlines departs from Ontario International on Sat, 25 Jul, arriving in Santa Rosa.Inbound direct flight with Alaska Airlines departs from Santa Rosa on Thu, 13 Aug, arriving in Ontario International.Price includes taxes and charges.From 193 €, select.
Santa Rosa.248 € per passenger.Departing Tue, 19 May, returning Sat, 23 May.Return flight with Alaska Airlines.Outbound direct flight with Alaska Airlines departs from Ontario International on Tue, 19 May, arriving in Santa Rosa.Inbound direct flight with Alaska Airlines departs from Santa Rosa on Sat, 23 May, arriving in Ontario International.Price includes taxes and charges.From 248 €, select.
Santa Rosa.253 € per passenger.Departing Thu, 3 Sep, returning Thu, 10 Sep.Return flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from Ontario International on Thu, 3 Sep, arriving in Santa Rosa.Inbound indirect flight with Southwest Airlines, departs from Santa Rosa on Thu, 10 Sep, arriving in Ontario International.Price includes taxes and charges.From 253 €, select.
Santa Rosa.274 € per passenger.Departing Wed, 21 Oct, returning Mon, 26 Oct.Return flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from Ontario International on Wed, 21 Oct, arriving in Santa Rosa.Inbound indirect flight with Southwest Airlines, departs from Santa Rosa on Mon, 26 Oct, arriving in Ontario International.Price includes taxes and charges.From 274 €, select.
Santa Rosa.347 € per passenger.Departing Fri, 20 Nov, returning Wed, 25 Nov.Return flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from Ontario International on Fri, 20 Nov, arriving in Santa Rosa.Inbound indirect flight with Southwest Airlines, departs from Santa Rosa on Wed, 25 Nov, arriving in Ontario International.Price includes taxes and charges.From 347 €, select.

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

We’re always keeping an eye on fares, so you can find the best one in seconds. It looks like Ontario International to Santa Rosa flights are currently cheapest in June.
May
from 248 €
Jun
from 139 €
Jul
from 184 €
Aug
from 192 €
Sep
from 253 €
Oct
from 274 €
Nov
from 347 €
Dec
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Jan
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Feb
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Mar
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Apr
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Direct flights from Ontario International to Santa Rosa

Ontario International to Santa Rosa: Alternative routes

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

Santa Rosa

11km from central Santa Rosa
ClosestCheapest
from 134 €
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Concord

76km from central Santa Rosa
Search flights

Ontario to Santa Rosa: Flight information

The things to know before you go.
Cheapest flight found134 €
Cheapest month to flyMay
Average flight time1 hr, 31 mins
Most popular airlineAlaska Airlines
Average flights per week16

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

The best price we found for a return flight from Ontario International to Santa Rosa is 134 €. 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 31 minutes is the average flight time from Ontario International to Santa Rosa.
Alaska Airlines, SkyWest Airlines and Horizon Air fly direct from Ontario International to Santa Rosa.
As of May 2026, there are 16 flights per week flying from Ontario International to Santa Rosa.
The cheapest month to fly from Ontario International to Santa Rosa is usually May.
After crunching the numbers on our flight calendar, we found that it's currently cheapest to fly from Ontario International Airport to Santa Rosa Airport on Saturday, 30 May 2026.
Yes – the average flight time is 1 hour and 31 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 Santa Rosa 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 Santa Rosa 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 Santa Rosa.

Travelling from Ontario International Airport (ONT) to Sonoma County Airport (STS): what you need to know

  • Your ONT to STS flight won't wait if you're late, so don't forget to check in on time. Arrive up to one hour in advance for domestic flights and two hours ahead for international travel.

  • During popular months such as August, you'll want to get to the airport even earlier. Arrive two hours before a domestic departure and four hours ahead for international flights whenever you're travelling during peak periods in general.

  • If you'd like to visit another city along the way, search for a flight with a stopover. To see your options for tickets from Ontario International Airport to Sonoma County Airport, deselect 'Direct flights only.' Phoenix Sky Harbour International Airport is a sought-after stop between ONT and STS.

How to find the cheapest flights from Ontario International Airport (ONT) to Sonoma County Airport (STS)

  • 66 € is currently the lowest price for a one-way Ontario International Airport to Sonoma County Airport flight. A return flight starts at 134 €. These fares may change based on availability.

  • To find cheap tickets from ONT to STS, book early. Airlines typically offer lower prices when flights are first released.

  • The 'Whole month' tool shows you the cheapest flights from Ontario International Airport to Sonoma County Airport across each month. It's an easy way to find a bargain if your travel dates are flexible.

  • Getting your hands on cheap flights from ONT to STS is a cinch with Price Alerts. Simply create one of these automatic alerts and we'll notify you when there's a better deal.

  • Discover the ideal flight for you with the help of the filters. To see the 'Best,' 'Cheapest' or 'Fastest' flights from Ontario International Airport to Sonoma County Airport, use the 'Sort by' tool. You can also filter results by airline, departure and arrival times, and journey duration.

Handy information about Ontario International Airport (ONT)

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

  • Ontario International Airport has a strong on-time record, so you're less likely to experience disruptions. Departures from ONT make it to their destination as scheduled 83.6% of the time.

  • To reach Ontario International Airport from central Ontario, it takes around 10 minutes if you're travelling by car. Of course, this depends on traffic. It's approximately 6 kilometres from the airport to the city centre.

  • The trip when using public transport typically takes 1 hour 30 minutes.

  • Catching an early flight from Ontario International Airport to Sonoma County Airport? Avoid the stress of rushing to the airport (and sneak in some extra snooze time) by picking one of these hotels close to ONT:

Arriving at Sonoma County Airport (STS)

Getting from Sonoma County Airport (STS) to central Santa Rosa

  • You'll find STS at 2200 Airport Boulevard.

  • Sonoma County Airport is approximately 13 kilometres from central Santa Rosa. The drive time takes about 15 minutes.

  • It'll take around 35 minutes if you're travelling by public transport.

When to fly to Sonoma County Airport (STS)

  • The quietest month for a flight from Ontario International Airport to Sonoma County Airport is May, while October is the most popular. Pick the ideal time to go to Santa Rosa based on whether you prefer a more fast-paced or easygoing experience.

  • Before locking in your flight from Ontario International Airport to Sonoma County Airport, consider the kind of weather you enjoy. August is the warmest month in Santa Rosa, with temperatures ranging from 11ºC (52ºF) to 29ºC (84ºF).

  • If you like travelling in cooler conditions, look for a cheap ticket from ONT to STS in February. Average temperatures are between 2ºC (36ºF) and 19ºC (66ºF) then.

Explore more of United States

  • You've done Santa Rosa, now it's time to explore other corners of United States. Journey about 145 kilometres south-east to San Jose to check off its leading sights. From Winchester Mystery House to Rosicrucian Egyptian Museum and San Jose Museum of Art, you'll have a full itinerary ahead.

  • Around 80 kilometres south of Santa Rosa, San Francisco is another favourite stop in United States. Experience this destination's highlights firsthand at Golden Gate Bridge, Alcatraz Island and Lombard Street.

Plan the rest of your trip from Ontario to Santa Rosa

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