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Cheap Flights from Islip (ISP) to Washington D.C. (BWI)

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Compare Islip to Baltimore Washington International flight deals

Find the cheapest month or even day of the year to fly to Baltimore Washington International

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Flight deals from Islip to Baltimore Washington International

Looking for a cheap last-minute deal or the best return flight from Islip to Baltimore Washington International? Find the lowest prices on one-way and return tickets right here.
Washington D.C..$368 per passenger.Departing Wed, 18 Jun, returning Thu, 19 Jun.Return flight with Southwest Airlines.Outbound direct flight with Southwest Airlines departs from Islip on Wed, 18 Jun, arriving in Baltimore Washington International.Inbound direct flight with Southwest Airlines departs from Baltimore Washington International on Thu, 19 Jun, arriving in Islip.Price includes taxes and charges.From $368, select.
Washington D.C..$370 per passenger.Departing Wed, 23 Jul, returning Wed, 23 Jul.Return flight with Southwest Airlines.Outbound direct flight with Southwest Airlines departs from Islip on Wed, 23 Jul, arriving in Baltimore Washington International.Inbound direct flight with Southwest Airlines departs from Baltimore Washington International on Wed, 23 Jul, arriving in Islip.Price includes taxes and charges.From $370, select.
Washington D.C..$441 per passenger.Departing Fri, 15 Aug, returning Sat, 23 Aug.Return flight with Southwest Airlines.Outbound direct flight with Southwest Airlines departs from Islip on Fri, 15 Aug, arriving in Baltimore Washington International.Inbound direct flight with Southwest Airlines departs from Baltimore Washington International on Sat, 23 Aug, arriving in Islip.Price includes taxes and charges.From $441, select.
Washington D.C..$540 per passenger.Departing Thu, 22 May, returning Thu, 29 May.Return flight with Southwest Airlines.Outbound direct flight with Southwest Airlines departs from Islip on Thu, 22 May, arriving in Baltimore Washington International.Inbound direct flight with Southwest Airlines departs from Baltimore Washington International on Thu, 29 May, arriving in Islip.Price includes taxes and charges.From $540, select.

Find the cheapest month to fly from Islip to Baltimore Washington International

We’re always keeping an eye on fares, so you can find the best one in seconds. It looks like Islip to Baltimore Washington International flights are currently cheapest in June.
May
from $540
Jun
from $368
Jul
from $370
Aug
from $441
Sep
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Oct
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Nov
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Dec
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Jan
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Feb
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Mar
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Apr
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Direct flights from Islip to Baltimore Washington International

Islip to Baltimore Washington International: Alternative routes

Compare routes from Islip to Washington D.C. below. You may find an airport to fly into that's cheaper, faster, or easier than Baltimore Washington International.

Islip to Washington D.C.: Flight information

The things to know before you go.
Cheapest flight found$368
Cheapest month to flyJune
Average flight time1 hr, 17 mins
Most popular airlineSouthwest Airlines
Average flights per week21

Finding cheap flights from Islip to Baltimore Washington International: Frequently asked questions

The best price we found for a return flight from Islip to Baltimore Washington International is $368. This is an estimate based on information collected from different airlines and travel providers over the last 4 days and is subject to change and availability.
1 hour and 17 minutes is the average flight time from Islip to Baltimore Washington International.
Southwest Airlines flies direct from Islip to Baltimore Washington International.
As of May 2025, there are 22 flights per week flying from Islip to Baltimore Washington International.
The cheapest month to fly from Islip to Baltimore Washington International is usually May 2025.
After crunching the numbers on our flight calendar, we found that it's currently cheapest to fly from Islip Airport to Baltimore Washington International Airport on Wednesday, 18 June 2025.
Yes – the average flight time is 1 hour and 18 minutes.
We show every price from over 1,200 airlines and travel agents, comparing them all so you don’t have to. If you know you want to fly to Baltimore Washington International but you’re not ready to book, set up a Price Alert. We’ll track prices for you, and let you know when they rise or fall.
We crunched all the numbers in our flight calendar and it looks like the cheapest time to book a flight to Washington D.C. is around 40 days in advance, so don’t leave your flight to the last minute.
Currently, Southwest Airlines offers the cheapest flight tickets to Baltimore Washington International.

Travelling from Long Island MacArthur Airport (ISP) to Baltimore/Wash International Thurgood Marshall Airport (BWI): what you need to know

  • Islip and Washington DC are in the UTC-4 timezone. That means you won't have to change your watch when you arrive.

  • Arriving two hours before an international flight and one hour ahead of a domestic departure are golden rules for hassle-free flying. Be at the airport on time to board your ISP to BWI flight.

  • You'll likely experience bigger queues in popular months like August. Arriving up to four hours in advance for international flights and two hours for domestic departures will help ensure a smooth travel experience.

  • Getting to Washington DC (and then discovering more of United States!) is easy with Southwest Airlines. This popular carrier offers direct flights from Long Island MacArthur Airport to Baltimore/Wash International Thurgood Marshall Airport.

  • The airline most travellers fly with on this route is Southwest Airlines.

  • With an impressive 88.95% of services landing on schedule, Southwest Airlines is the most punctual carrier for ISP to BWI flights.

  • Think about adding a stopover when booking your ticket from Long Island MacArthur Airport to Baltimore/Wash International Thurgood Marshall Airport. Simply uncheck 'Direct flights only' to break up your trip, or even explore someplace new along the way. Check out these options between ISP and BWI:

    • Myrtle Beach International Airport

    • Raleigh-Durham International Airport

    • Charleston International Airport

How to find the cheapest flights from Long Island MacArthur Airport (ISP) to Baltimore/Wash International Thurgood Marshall Airport (BWI)

  • The lowest price we've found for a one-way Long Island MacArthur Airport to Baltimore/Wash International Thurgood Marshall Airport flight is $138. A round-trip plane ticket is currently $368. Depending on the availability when you book, these fares could change.

  • Don't leave everything to the last minute. You're more likely to get cheap tickets from ISP to BWI if you book early. Airlines often have some terrific early bird deals.

  • Finding cheap flights from Long Island MacArthur Airport to Baltimore/Wash International Thurgood Marshall Airport is more likely if you can be flexible with your travel plans. Use the 'Whole month' search tool to see the best prices across the month and snap up a great deal.

  • Cut down on the time spent looking for cheap flights from ISP to BWI by creating a Price Alert. You'll receive an email or push notification on the app when a lower fare pops up.

  • Select your preferred departure and arrival times, airlines and number of stops with the filters. Or sort your results by 'Cheapest' to find the best deals on flights from Long Island MacArthur Airport to Baltimore/Wash International Thurgood Marshall Airport.

Handy information about Long Island MacArthur Airport (ISP)

  • You'll find ISP at 100 Arrivals Avenue.

  • 77.45% of flights that depart Long Island MacArthur Airport make it to their destination on time.

  • To get to Long Island MacArthur Airport from central Islip, it'll take about 15 minutes if you're planning to drive. Of course, this depends on traffic. It's approximately 16 kilometres from the airport to the city centre.

  • Expect a trip time of around 1 hour 10 minutes when using public transport.

  • Booked an early flight from Long Island MacArthur Airport to Baltimore/Wash International Thurgood Marshall Airport? Avoid the last-minute rush to the terminal (and sneak in some extra precious sleep) by choosing one of these hotels close to ISP:

Arriving at Baltimore/Wash International Thurgood Marshall Airport (BWI)

Getting from Baltimore/Wash International Thurgood Marshall Airport (BWI) to central Washington DC

  • From Baltimore/Wash International Thurgood Marshall Airport, Washington DC is approximately 48 kilometres away. It takes around 50 minutes to drive to the centre.

  • Getting to the centre by public transport takes roughly 1 hour 30 minutes.

When to fly to Baltimore/Wash International Thurgood Marshall Airport (BWI)

  • July is the most popular month for flights from Long Island MacArthur Airport to Baltimore/Wash International Thurgood Marshall Airport. To avoid the crowds, go to Washington DC in May.

  • The warmest month in Washington DC is July, with temperatures ranging between 19ºC (66ºF) and 33ºC (91ºF). Lock in your flights from Long Island MacArthur Airport to Baltimore/Wash International Thurgood Marshall Airport in this month if this is the kind of weather you like.

  • If you want cooler conditions, search for a cheap ticket from ISP to BWI in January. Temperatures average between -6ºC (21ºF) and 10ºC (50ºF) then.

Explore more of United States

  • You've seen Washington DC, now it's time to explore other parts of United States. Travel about 322 kilometres north-east to New York to tick off its leading sights. From Statue of Liberty to Central Park and Empire State Building, you'll have a packed itinerary ahead.

  • Around 193 kilometres north-east of Washington DC, Philadelphia is another favourite stop in United States. Start your sightseeing at Liberty Bell, Independence Hall and Philadelphia Museum of Art.

Plan the rest of your trip from Islip to Washington D.C.

Prices shown on this page are estimated lowest prices only. Found in the last 45 days.