$219+ Cheap flights from Islip, NY to Ontario (ISP - 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 7/1. Fares are subject to change and may not be available on all flights or dates of travel.
ISP — ONT
Apr 20 — Apr 271
1 adult, Economy
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Find cheap flights from Islip to Ontario with Cheapflights
1. Tell us where you want to go
Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”2. Select your favorite providers
We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.3. Compare prices and book
Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.Cheap flight deals from Islip to Ontario
Discover tips and strategies to find the most affordable flight options for your journey from Islip (ISP) to Ontario (ONT). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated April 15, 2025.
Most accurate provider | eDreams 3 stars |
|---|---|
Most trusted provider | eDreams 3 stars |
Round-trip from | $394 (Southwest) |
One-way from | $219 (Southwest) |
Popular in | December |
Cheapest in | September |
Average price | $407 |
Find flight deals from Islip to Ontario
Cheapest flights from Islip to OntarioExplore the most affordable flight options available from Islip to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on April 15, 2025.
Explore the most affordable flight options available from Islip to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on April 15, 2025.
This Southwest deal was found by Cheapflights users on 4/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/14:40 pmISP - ONT
2 stops9h 00mSouthwest
Wed 7/99:20 pmONT - ISP
1 stop9h 05mSouthwest
Deal found 4/15![Southwest logo]()
$394
Cheapflights Fare Finder
Customize your flight search to find flights from Islip to Ontario that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated April 15, 2025.
Use the filters below to find and compare flights from Islip to Ontario that are best for you.
Fly from
Islip
Fly to
Ontario
Route
Depart
Return
Price
IslipOntario
ISP - ONT
ISPONT
Islip Long Island
Tue 7/1
4:40 pm-10:40 pm
2 stops9h 00m
Ontario
Wed 7/9
9:20 pm-9:25 am
1 stop9h 05m
$394
IslipOntario
ISP - ONT
ISPONT
Islip Long Island
Tue 7/1
4:40 pm-10:40 pm
2 stops9h 00m
$219
Compare providers for flights from Islip to Ontario
Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Islip to Ontario in April.
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*2 stars | |
| Price Accuracy1 star | Trust Score*3 stars |
- Most accurate provider: When it comes to deals on Islip, New York-Ontario flights, users find the pricing of eDreams to be most consistent on Cheapflights vs. eDreams Users can find the same prices on Islip, New York-Ontario flight deals on Cheapflights vs. eDreams >95% of the time. Price accuracy is based on data collected from Islip, New York-Ontario flight searches over the past month and is updated monthly.
- Most trusted provider: When it comes to deals on Islip, New York-Ontario flights, Cheapflights users trust eDreams the most. eDreams 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 Islip, New York-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 Islip to Ontario
Have a flexible travel schedule? Discover the best time to fly to Ontario from Islip 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 Islip to Ontario
What is the cheapest month to book a flight from Islip, New York to Ontario?
Currently, August is the cheapest month in which you can book a flight from Islip, New York to Ontario (average of $246). Flying from Islip, New York to Ontario in March is currently the most expensive (average of $328). 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.
Rainfall in Ontario by month
Plan your trip to Ontario by taking into account the average rainfall totals by month.
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.
Temperature in Ontario by month
Plan your trip to Ontario by taking into account the average temperature totals by month.
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).
Reviews of airlines servicing Ontario
Get insights into the airlines that provide service to Ontario. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Ontario. Reviews last updated April 15, 2025.
Overall
8.0
Comfort
8.0
Entertainment
7.6
Crew
8.6
Boarding
8.2
Food
7.1
Reviews
1 / 20
10.0
ExcellentMerlyn,Feb 2025
LAX - SMF
Overall
8.0
Comfort
8.0
Entertainment
7.6
Crew
8.6
Boarding
8.2
Food
7.1
Reviews
1 / 20
10.0
ExcellentMerlyn,Feb 2025
LAX - SMF