In terms of precipitation, rainfall in Ontario ranges from 0.1 - 3.4 inches per month. February is typically the wettest month, when rainfall can reach 3.4 in. June is typically the driest time to visit Ontario when rainfall is around 0.1 in.

If weather is an important factor for your trip to Ontario, use this chart to help with planning. For those seeking warmer temperatures, August is the ideal time of year to visit, when temperatures reach an average of 78.8 F. Travelers looking to avoid the cold should look outside of December, when temperatures are typically at their lowest (around 53.6 F).

What is the cheapest time of day to fly from SWF to ONT?

When flying from New Windsor to Ontario, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

Most accurate provider : When it comes to deals on New Windsor-Ontario flights, users find the pricing of Expedia to be most consistent on Cheapflights vs. Expedia Users can find the same prices on New Windsor-Ontario flight deals on Cheapflights vs. Expedia <90% of the time. Price accuracy is based on data collected from New Windsor-Ontario flight searches over the past month and is updated monthly.

Most trusted provider : When it comes to deals on New Windsor-Ontario flights, Cheapflights users trust Expedia the most. Expedia has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for New Windsor-Ontario flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

Can I find deals for flights from Stewart to Ontario that include hotel bookings?

Yes. In addition to deals on Stewart to Ontario flights, Cheapflights offers vacation packages that include both flights and hotel.

How can I find direct flights from Stewart to Ontario?

After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Stewart to Ontario.

Can I find deals for business class flights from Stewart to Ontario?

Yes. Cheapflights offers flight deals from Stewart to Ontario by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

$189+ Cheap Flights from New Windsor to Ontario

Q: What is the cheapest month to book a flight from New Windsor to Ontario?

Currently, August is the cheapest month in which you can book a flight from New Windsor to Ontario (average of $90). Flying from New Windsor to Ontario in February is currently the most expensive (average of $145). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

Q: E

Most trusted provider : When it comes to deals on New Windsor-Ontario flights, Cheapflights users trust Expedia the most. Expedia has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for New Windsor-Ontario flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

Q: Can I find deals for flights from Stewart to Ontario that include hotel bookings?

Yes. In addition to deals on Stewart to Ontario flights, Cheapflights offers vacation packages that include both flights and hotel.

Q: How can I find direct flights from Stewart to Ontario?

After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Stewart to Ontario.

Q: Can I find deals for business class flights from Stewart to Ontario?

Yes. Cheapflights offers flight deals from Stewart to Ontario by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

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Cheap flight deals from Stewart to Ontario

One-way

One-way flights from Stewart to Ontario
Search for one-way flight options from Stewart to Ontario. Find affordable one-way fares based on user searches. Data last updated February 27, 2026.

Fri 4/2411:40 am

SWF

ONT

3 stops39h 15m

Multiple Airlines

Deal found 2/27

$189

Sun 7/510:28 am

SWF

ONT

2 stops49h 47m

Multiple Airlines

Deal found 2/23

$381

Find flight deals from Stewart to Ontario

Most accurate provider	Expedia 1 star
Most trusted provider	Expedia 3 stars
Popular in	December
Cheapest in	January
Average price	$358

Provider with most accurate pricing for New Windsor Stewart-Ontario flight deals.

Search Deals

Provider most trusted by Cheapflights users for New Windsor Stewart-Ontario flights.

Search Deals

Highest demand for flights based on searches. 3% potential increase in price ($13 potential increase over avg. RT price).

Search Deals

Cheapest flight prices on average. 2% potential price decrease ($9 potential savings vs. average RT price).

Search Deals

Average for round-trip flights in February 2026

Search Deals

Fly from

Fly to

Route

Depart

Return

Price

New WindsorOntario

SWF - ONT

SWFONT

New Windsor Stewart

Fri 4/24

11:40 am-11:55 pm

3 stops39h 15m

$189

New WindsorOntario

SWF - ONT

SWFONT

New Windsor Stewart

Sun 7/5

10:28 am-9:15 am

2 stops49h 47m

$381

Flights are sorted by cheapest round-trip flights first.

Deals found on 2/27

Sorted by cheapest first

Most accurate provider: When it comes to deals on New Windsor-Ontario flights, users find the pricing of Expedia to be most consistent on Cheapflights vs. Expedia Users can find the same prices on New Windsor-Ontario flight deals on Cheapflights vs. Expedia <90% of the time. Price accuracy is based on data collected from New Windsor-Ontario flight searches over the past month and is updated monthly.
Most trusted provider: When it comes to deals on New Windsor-Ontario flights, Cheapflights users trust Expedia the most. Expedia has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for New Windsor-Ontario flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

Best time to book a flight from Stewart to Ontario

Have a flexible travel schedule? Discover the best time to fly to Ontario from Stewart with our price prediction graph.

SWF-ONT

Estimated round-trip price

Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from New Windsor to Ontario

What is the cheapest month to book a flight from New Windsor to Ontario?

Currently, August is the cheapest month in which you can book a flight from New Windsor to Ontario (average of $90). Flying from New Windsor to Ontario in February is currently the most expensive (average of $145). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

Related info for your journey

Can I find deals for flights from Stewart to Ontario that include hotel bookings?
Yes. In addition to deals on Stewart to Ontario flights, Cheapflights offers vacation packages that include both flights and hotel.
How can I find direct flights from Stewart to Ontario?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Stewart to Ontario.
Can I find deals for business class flights from Stewart to Ontario?
Yes. Cheapflights offers flight deals from Stewart to Ontario by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.
What is the cheapest month to book a flight from New Windsor to Ontario?
Currently, August is the cheapest month in which you can book a flight from New Windsor to Ontario (average of $90). Flying from New Windsor to Ontario in February is currently the most expensive (average of $145). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

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$189+ Cheap flights from New Windsor to Ontario (SWF - ONT)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 4/24. Fares are subject to change and may not be available on all flights or dates of travel.

Find cheap flights from Stewart to Ontario with Cheapflights

1. Tell us where you want to go

2. Select your favorite providers

3. Compare prices and book

Cheap flight deals from Stewart to Ontario

One-way flights from Stewart to OntarioSearch for one-way flight options from Stewart to Ontario. Find affordable one-way fares based on user searches. Data last updated February 27, 2026.

Search for one-way flight options from Stewart to Ontario. Find affordable one-way fares based on user searches. Data last updated February 27, 2026.

Find flight deals from Stewart to Ontario

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Cheapest in

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Use the filters below to find and compare flights from New Windsor to Ontario that are best for you.

Best time to book a flight from Stewart to Ontario

Have a flexible travel schedule? Discover the best time to fly to Ontario from Stewart with our price prediction graph.

Cheapflights Insights

Everything you need to know about your flight from New Windsor to Ontario

What is the cheapest month to book a flight from New Windsor to Ontario?

Related info for your journey

Find useful and relevant information for your journey from Stewart to Ontario. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

Can I find deals for flights from Stewart to Ontario that include hotel bookings?

How can I find direct flights from Stewart to Ontario?

Can I find deals for business class flights from Stewart to Ontario?

What is the cheapest month to book a flight from New Windsor to Ontario?

Browse thousands of different options on Cheapflights for your next trip

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Alternative routes for Stewart to Ontario

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Complete your trip

Complete your trip to Ontario by adding a car rental and/or hotel reservation to your travel itinerary.

Search flights from Stewart to Ontario by cabin class

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Other flights to Ontario

Explore flights to Ontario departing from other origins. Flights are based on user searches made on Cheapflights and were last updated on February 27, 2026.

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One-way flights from Stewart to Ontario
Search for one-way flight options from Stewart to Ontario. Find affordable one-way fares based on user searches. Data last updated February 27, 2026.