Latest deals
FAQs
Price Alerts

Cheap flights from Islip, New York to Belfast from $774

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Islip, New York to Belfast departing on 3/21. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
0 bags

Save money when you book flights with momondo

Big names and deals

Big names and deals

Search 100s of travel sites to compare prices.

Filter for what you want

Filter for what you want

Free Wi-Fi? Stopover? Instantly customize your results.

Trusted and free

Trusted and free

We’re completely free to use - no hidden charges or fees.

Price Alerts

Price Alerts

Not ready to book? to track prices.
Search flight deals

Find the cheapest flights from Islip, New York to Belfast

Cheap round-trip flights

Enter your travel dates to find the best prices.
Multiple Airlines Logo
9:59 am - 10:30 am
ISP
-
BHD
20h 31m
2 stops
Multiple Airlines Logo
2:50 pm - 6:44 pm
BHD
-
ISP
31h 54m
2 stops
$1,571Multiple Airlines
Fri, Mar 20 - Fri, Mar 27

momondo Fare Finder

 
Customize your flight search to find flights from Islip, New York to Belfast 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, momondo users made 832,500 searches. Data last updated February 23, 2026.
Use the filters below to find and compare flights from Islip, New York to Belfast that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

IslipBelfast

ISP - BHD

ISPBHD

Islip Long Island

Fri 3/20

9:59 am-10:30 am

2 stops20h 31m

Belfast City

Fri 3/27

2:50 pm-6:44 pm

2 stops31h 54m

$1,571

IslipBelfast

ISP - BHD

ISPBHD

Islip Long Island

Sat 3/21

9:59 am-9:10 am

2 stops19h 11m

$774

IslipBelfast

ISP - BFS

ISPBFS

Islip Long Island

Sat 3/21

9:59 am-10:40 pm

3 stops32h 41m

$800

Flights are sorted by cheapest round-trip flights first.

Sorted by cheapest first

Cheap Islip, New York to Belfast flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Islip, New York to Belfast

Fastest flight time

20h 31m

Direct flights

None
The fastest flight from Islip, New York to Belfast takes 20h 31m
There are no direct flights from Islip, New York to Belfast. There are no popular flight routes from Islip, New York to Belfast.
Search flight deals

  • How far is Islip Long Island to Belfast by plane?

    A flight from Islip Long Island to Belfast will travel around 3138.8 mi. 20h 31m is a normal flight duration for this route.

  • When did momondo last update prices for flights from Islip Long Island Airport to Belfast?

    Prices for flights from Islip Long Island Airport to Belfast are updated daily.

  • How old do you have to be to fly from Islip Long Island Airport to Belfast?

    Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Islip Long Island Airport to Belfast.

  • What documentation or ID do you need to fly to Belfast?

    The necessary travel and health documents for your Belfast trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's license and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.

  • How do I get Price Alerts for flights from Islip, New York to Belfast?

    Confirm your travel details to search for the latest offers for flights from Islip, New York to Belfast. While browsing offers there will be the option to toggle “Price Alerts”. You’ll then receive updates when prices for the flight route increase or decrease.

  • How can I save money on flights from Islip, New York to Belfast with momondo?

    With “Price Forecast”, learn how soon you should book your flight in advance. Down to the day of week and time of day, our information can inform you on the ideal time to book to save on your travel. Our “Price Calendar” shows you at a quick glance when to book your travel for lower rates. By setting “Price Alerts” you can monitor changes in price and target the ideal time to book. Search for your trip destination by budget amount via our “Explore” feature. Whether you’re looking for ideas for your next travel adventure or cost-cutting tips, our “Discover” content is a great place to start.

  • How does momondo find its flight prices?

    We compare prices from 700+ competitors to help you find the price that works best for you. momondo operates in over 30 international markets, bringing you access to a wide range of fares and deals. Search for your travel using momondo for a diverse range of options from airlines and OTAs.

Why use momondo?

Why should I use momondo to find a flight deal from Islip to Belfast?

To find the flight that best suits your needs, momondo gathers a range of flights from a large pool of different airlines and agents; you can then use our insights and filters to find and book the right flight to Belfast from Islip.

Can I find flights from Islip to Belfast with flexible booking policies on momondo?

Yes. momondo enables you to select and highlight flights to Belfast from Islip with this policy.

How can momondo help me find flights from Islip to Belfast?

momondo offers useful filters to help you find the right flight. Choose specific flight times, airports or even what payment method you prefer. We have numerous options to help you book your ideal flight from Islip to Belfast.

I’m not ready to book a flight from Islip to Belfast right now. Can momondo alert me if prices change?

Yes. momondo can track prices for Islip to Belfast flights and alert you when they change. Perform a search to set up the price alert. All that is required is a valid email address.

An easier way to manage your Belfast trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.
Start using Trips
Find my bookings

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.
1 adult
Wed 3/25
Wed 4/1
By creating a price alert you accept our terms of use and privacy policy.

Find better results for your trip to the United Kingdom

Fly into one of these airports located in Belfast

Airports listed have a maximum distance of 12.2 mi from Belfast
Belfast Intl Airport
Belfast City Airport