Cheap flights from Seattle, WA to Islip, NY

Flights starting at $139. Choose between Frontier Airlines, Alaska Airlines, or Spirit Airlines to find the best price.

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Tips to know when travelling to Islip

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Travelers usually depart from Seattle–Tacoma International, or Kenmore Air Harbor Seaplane Base when they travel from Seattle to Islip. The most popular airlines for this route are Frontier Airlines, Alaska Airlines, Spirit Airlines, Sun Country Airlines, and Allegiant Air. Seattle and Islip have 152 direct flights per week. When you arrive at Islip, consider visiting Staten Island, Metropolitan Museum of Art, Statue of Liberty, Times Square, Empire State Building, and Manhattan Island.

Check-in for a flight from Seattle to Islip

NameCarrier codeIATA CodePassport needed during bookingOnline check-in available
Frontier AirlinesFFTF9NoOpens 24 days before flight
Closes 1 hours before flight
Alaska AirlinesASAASNoOpens 24 days before flight
Closes 1 hours before flight
Spirit AirlinesNKSNKNoOpens 24 days before flight
Closes 1 hours before flight
Sun Country AirlinesSCXSYYesNo
Allegiant AirAAYG4NoOpens 24 days before flight
Closes 1 hours before flight

Weather in Islip

Average Weather

MonthAverage monthly max temperatureAverage monthly min temperature
January3°C-1°C
February4°C0°C
March7°C2°C
April12°C7°C
May17°C12°C
June22°C17°C
July26°C21°C
August26°C21°C
September22°C18°C
October17°C13°C
November11°C6°C
December7°C2°C
Hottest Month
26°C
July
Coldest month
-1°C
January
Sunny days
271
days per year
Snow days
8
days per year

14 day forecast

Friday
22 Mar
4°C-2°C
29 Mar
14°C7°C
Saturday
23 Mar
85%
11°C5°C
30 Mar
89%
12°C4°C
Sunday
24 Mar
6°C1°C
31 Mar
70%
9°C4°C
Monday
25 Mar
10°C1°C
1 Apr
9°C1°C
Tuesday
26 Mar
10°C2°C
2 Apr
9°C4°C
Wednesday
27 Mar
88%
6°C5°C
3 Apr
84%
10°C9°C
Thursday
28 Mar
81%
12°C6°C
4 Apr
88%
19°C10°C

Frequently asked questions

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