In terms of precipitation, rainfall in Grand Rapids ranges from 1.8 - 4.3 inches per month. September is typically the wettest month, when rainfall can reach 4.3 in. February is typically the driest time to visit Grand Rapids when rainfall is around 1.8 in.

If weather is an important factor for your trip to Grand Rapids, 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 24.8 F).

How far in advance should I book a flight from Islip to Grand Rapids?

To save on the cost of your flight from Islip to Grand Rapids, book at least 29 days before your planned departure. Booking around this time can save you about 55% on the cost of this flight compared to booking a flight leaving this week. We have found prices from $312 if you need a flight within two weeks. For flights within the next 72 hours, you can find tickets from as low as $349.

What is the cheapest month to fly from Islip to Grand Rapids?

Flights from Islip to Grand Rapids lean towards being more expensive in December. Prices are generally better when you fly from Islip to Grand Rapids in June, with the cheapest ticket starting at $93.

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

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

Can I find deals for flights from Islip to Grand Rapids that include hotel bookings?

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

How can I find direct flights from Islip to Grand Rapids?

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

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

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

$140+ Flights from Islip to Grand Rapids

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Cheap flight deals from Islip to Grand Rapids

Popular in	December
Cheapest in	June
Average price	$327

Highest demand for flights based on searches. 13% potential increase in price ($51 potential increase over avg. RT price).

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Cheapest flight prices on average. 3% potential price decrease ($11 potential savings vs. average RT price).

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Average for round-trip flights in August 2025

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Find flight deals from Islip to Grand Rapids

Cheapest flights from Islip to Grand Rapids
Explore the most affordable flight options available from Islip to Grand Rapids. Find the lowest fares from popular airlines and budget airlines, with prices last updated on August 25, 2025.

Sat 8/307:33 pmISP - GRR

1 stop22h 43mFrontier

Sat 9/65:58 pmGRR - ISP

2 stops16h 52mFrontier

Deal found 8/25

$407

Last-minute flights from Islip to Grand Rapids
Discover last-minute flight deals from Islip to Grand Rapids. Data last updated August 25, 2025 and is based on user searches.

Sat 8/307:33 pmISP - GRR

1 stop22h 43mFrontier

Sat 9/65:58 pmGRR - ISP

2 stops16h 52mFrontier

Deal found 8/25

$407

One-way flights from Islip to Grand Rapids
Search for one-way flight options from Islip to Grand Rapids. Find affordable one-way fares based on user searches. Data last updated August 25, 2025.

Mon 9/295:05 pmISP - GRR

1 stop24h 31mMultiple Airlines

Deal found 8/25

$140

Mon 9/296:00 amISP - GRR

2 stops5h 35mSouthwest

Deal found 8/25

$204

Fly from

Fly to

Route

Depart

Return

Price

IslipGrand Rapids

ISP - GRR

ISPGRR

Islip Long Island

Mon 9/29

5:05 pm-5:36 pm

1 stop24h 31m

$140

IslipGrand Rapids

ISP - GRR

ISPGRR

Islip Long Island

Mon 9/29

6:00 am-11:35 am

2 stops5h 35m

$204

Flights are sorted by cheapest round-trip flights first.

Deals found on 8/25

Best time to book a flight from Islip to Grand Rapids

Have a flexible travel schedule? Discover the best time to fly to Grand Rapids 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 Grand Rapids

What is the cheapest month to book a flight from Islip to Grand Rapids?

Currently, January is the cheapest month in which you can book a flight from Islip to Grand Rapids (average of $316). Flying from Islip to Grand Rapids in March is currently the most expensive (average of $408). 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 Islip to Grand Rapids that include hotel bookings?
Yes. In addition to deals on Islip to Grand Rapids flights, Cheapflights offers vacation packages that include both flights and hotel.
How can I find direct flights from Islip to Grand Rapids?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Islip to Grand Rapids.
Can I find deals for business class flights from Islip to Grand Rapids?
Yes. Cheapflights offers flight deals from Islip to Grand Rapids 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 Islip to Grand Rapids?
Currently, January is the cheapest month in which you can book a flight from Islip to Grand Rapids (average of $316). Flying from Islip to Grand Rapids in March is currently the most expensive (average of $408). 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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$140+ Cheap flights from Islip to Grand Rapids (ISP - GRR)

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 9/29. Fares are subject to change and may not be available on all flights or dates of travel.

Find cheap flights from Islip to Grand Rapids with Cheapflights

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Cheap flight deals from Islip to Grand Rapids

Popular in

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Find flight deals from Islip to Grand Rapids

Cheapest flights from Islip to Grand RapidsExplore the most affordable flight options available from Islip to Grand Rapids. Find the lowest fares from popular airlines and budget airlines, with prices last updated on August 25, 2025.

Explore the most affordable flight options available from Islip to Grand Rapids. Find the lowest fares from popular airlines and budget airlines, with prices last updated on August 25, 2025.

Cheapflights Fare Finder

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

Best time to book a flight from Islip to Grand Rapids

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

Cheapflights Insights

Everything you need to know about your flight from Islip to Grand Rapids

What is the cheapest month to book a flight from Islip to Grand Rapids?

Related info for your journey

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

How can I find direct flights from Islip to Grand Rapids?

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

What is the cheapest month to book a flight from Islip to Grand Rapids?

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Cheapest flights from Islip to Grand Rapids
Explore the most affordable flight options available from Islip to Grand Rapids. Find the lowest fares from popular airlines and budget airlines, with prices last updated on August 25, 2025.