In terms of precipitation, rainfall in Islip, New York ranges from 3.3 - 4.4 inches per month. March is typically the wettest month, when rainfall can reach 4.4 in. February is typically the driest time to visit Islip, New York when rainfall is around 3.3 in.

If weather is an important factor for your trip to Islip, New York, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 73.4 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 30.2 F).

What is the cheapest time of day to fly from YOW to ISP?

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Ottawa to Islip, New York as you normally would.

Most accurate provider : When it comes to deals on Ottawa-Islip, New York flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Ottawa-Islip, New York flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Ottawa-Islip, New York flight searches over the past month and is updated monthly.

Most trusted provider : When it comes to deals on Ottawa-Islip, New York flights, Cheapflights users trust FlightHub the most. FlightHub 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 Ottawa-Islip, New York 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 Ottawa to Islip that include hotel bookings?

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

How can I find direct flights from Ottawa to Islip?

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

Can I find deals for business class flights from Ottawa to Islip?

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

$527+ Flights from Ottawa to Islip, NY

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Cheap flight deals from Ottawa to Islip

Cheapest flights from Ottawa to Islip
Explore the most affordable flight options available from Ottawa to Islip. Find the lowest fares from popular airlines and budget airlines, with prices last updated on January 28, 2026.

Tue 2/105:40 am

YOW

ISP

2 stops31h 33m

Multiple Airlines

Fri 2/133:34 pm

ISP

YOW

1 stop8h 24m

Multiple Airlines

Deal found 1/27

$527

Best flights from Ottawa to Islip
Discover carefully curated flight deals from Ottawa to Islip that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated January 28, 2026.

Tue 2/105:40 am

YOW

ISP

2 stops31h 33m

Multiple Airlines

Fri 2/133:34 pm

ISP

YOW

1 stop8h 24m

Multiple Airlines

Deal found 1/27

$527

Last-minute flights from Ottawa to Islip
Discover last-minute flight deals from Ottawa to Islip. Data last updated January 28, 2026 and is based on user searches.

Tue 2/105:40 am

YOW

ISP

2 stops31h 33m

Multiple Airlines

Fri 2/133:34 pm

ISP

YOW

1 stop8h 24m

Multiple Airlines

Deal found 1/27

$527

Find flight deals from Ottawa to Islip

Most accurate provider	FlightHub 3 stars
Most trusted provider	FlightHub 3 stars
Round-trip from	$527 (Kiwi.com)
Popular in	January
Cheapest in	June
Average price	$299

Provider with most accurate pricing for Ottawa-Islip Long Island flight deals.

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Provider most trusted by Cheapflights users for Ottawa-Islip Long Island flights.

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From Ottawa to Islip Long Island

Search Deals

Highest demand for flights based on searches. 5% potential increase in price ($16 potential increase over avg. RT price).

Search Deals

Cheapest flight prices on average. 0% potential price decrease ($2 potential savings vs. average RT price).

Search Deals

Average for round-trip flights in January 2026

Search Deals

Fly from

Fly to

Route

Depart

Return

Price

OttawaIslip

YOW - ISP

YOWISP

Ottawa

Tue 2/10

5:40 am-1:13 pm

2 stops31h 33m

Islip Long Island

Fri 2/13

3:34 pm-11:58 pm

1 stop8h 24m

$527

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/27

Most accurate provider: When it comes to deals on Ottawa-Islip, New York flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Ottawa-Islip, New York flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Ottawa-Islip, New York flight searches over the past month and is updated monthly.
Most trusted provider: When it comes to deals on Ottawa-Islip, New York flights, Cheapflights users trust FlightHub the most. FlightHub 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 Ottawa-Islip, New York 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 Ottawa to Islip

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

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 Ottawa to Islip

What is the cheapest month to book a flight from Ottawa to Islip, New York?

Currently, January is the cheapest month in which you can book a flight from Ottawa to Islip, New York (average of $117). Flying from Ottawa to Islip, New York in October is currently the most expensive (average of $200). 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 Ottawa to Islip that include hotel bookings?
Yes. In addition to deals on Ottawa to Islip flights, Cheapflights offers vacation packages that include both flights and hotel.
How can I find direct flights from Ottawa to Islip?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Ottawa to Islip.
Can I find deals for business class flights from Ottawa to Islip?
Yes. Cheapflights offers flight deals from Ottawa to Islip 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 Ottawa to Islip, New York?
Currently, January is the cheapest month in which you can book a flight from Ottawa to Islip, New York (average of $117). Flying from Ottawa to Islip, New York in October is currently the most expensive (average of $200). 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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Complete your trip

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$527+ Cheap flights from Ottawa (YOW) to Islip, NY (ISP)

This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 2/10. Fares are subject to change and may not be available on all flights or dates of travel.

Find cheap flights from Ottawa to Islip with Cheapflights

1. Tell us where you want to go

2. Select your favorite providers

3. Compare prices and book

Cheap flight deals from Ottawa to Islip

Cheapest flights from Ottawa to IslipExplore the most affordable flight options available from Ottawa to Islip. Find the lowest fares from popular airlines and budget airlines, with prices last updated on January 28, 2026.

Explore the most affordable flight options available from Ottawa to Islip. Find the lowest fares from popular airlines and budget airlines, with prices last updated on January 28, 2026.

Find flight deals from Ottawa to Islip

Most accurate provider

Most trusted provider

Round-trip from

Popular in

Cheapest in

Average price

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Use the filters below to find and compare flights from Ottawa to Islip that are best for you.

Best time to book a flight from Ottawa to Islip

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

Cheapflights Insights

Everything you need to know about your flight from Ottawa to Islip

What is the cheapest month to book a flight from Ottawa to Islip, New York?

Related info for your journey

Find useful and relevant information for your journey from Ottawa to Islip. 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 Ottawa to Islip that include hotel bookings?

How can I find direct flights from Ottawa to Islip?

Can I find deals for business class flights from Ottawa to Islip?

What is the cheapest month to book a flight from Ottawa to Islip, New York?

Traveling to a place near Islip?

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Cheapest flights from Ottawa to Islip
Explore the most affordable flight options available from Ottawa to Islip. Find the lowest fares from popular airlines and budget airlines, with prices last updated on January 28, 2026.