The cheapest times to fly from IAD to ILY are

  • January 1st to March 18th
  • October 1st to October 14th
  • October 29th to December 9th (except the week of November 19th)

based on data collected exclusively by Champion Traveler across tens of millions of flights. Among all the dates above, the very cheapest time to fly from IAD to ILY is mid January. Prices can be as high as $1924 for Friday flights during mid July, or as low as $785 for Monday flights around mid January.


When to Fly to Islay

Flying from Washington, DC (IAD) to Islay (ILY) will usually cost between $801 to $1508 per person if booking more than four weeks in advance. On average the very cheapest time to fly is mid January with an average ticket price of $822. Due to high demand the most expensive time to fly is mid July, with an average price of $1697. Planning your trip to low-cost times can easily save you $875 on economy flights and even more on first-class flights. Generally, any price below $891 can be considered a good price for a round-trip IAD to ILY flight.

See below for a graph of average weekly prices for the IAD to ILY route. All prices are for round-trip tickets in USD.

IAD to ILY Flight Prices

Compared to other flights, the IAD to ILY flight is cheaper than the average and costs less than the average flight leaving from Washington. The average price per mile (for a direct flight) is $0.16, which is far below average.


Flight Prices by Day of the Week

Monday is usually the cheapest day to fly to ILY, and Sunday the cheapest day to fly back into IAD. Fridays are the most expensive days to fly to Islay, and Saturdays are the most expensive days to return to Washington. Selecting flights on the least expensive days could save you up to $305 (18%) on this flight.

Departing prices are for round-trip flights returning on the day of departure. For example, a flight departing on Monday and returning a week later will cost an average of $919. Return trip prices are from the ILY to IAD flight, and often highlight the quality of our data in showing the same trend.

Departing Prices by Day

Departure Day Prices

Return Trip Prices by Day

Return Day Prices


Nonstop Flights and Layovers

Travelers looking to fly from IAD to ILY can generally find a 2-layover flight. Because there is not usually a direct flight option the real-world direct flight time of 7 hour 2 minutes may not be realistic.


Alternative Nearby Airports

Champion Traveler tells you which airports are nearby and whether tickets might be cheaper alternative airports nearby. Sometimes it’s worth it to fly into a closer airport and then commute to your destination. Remember that there is not usually a nonstop flight from IAD to ILY while comparing.

Destination alternative #1: Glasgow Airport (GLA) in Glasgow

  • 72 miles (116 km) away from ILY
  • Usually 17.62% less expensive than ILY
  • 1-layover flights available

See IAD to GLA flights

Destination alternative #2: Edinburgh Airport (EDI) in Edinburgh

  • 114 miles (183 km) away from ILY
  • Usually 16.39% less expensive than ILY
  • Nonstop flights available

See IAD to EDI flights

Destination alternative #3: Donegal Airport (CFN) in Dongloe

  • 93 miles (150 km) away from ILY
  • Usually 7.18% less expensive than ILY
  • 1-layover flights available

See IAD to CFN flights


Flight Hacking IAD to ILY

Flight hacking is when you book two tickets instead of a layover, sometimes with different airlines. You will need to either bring only a carry-on bag (highly recommended) or leave yourself plenty of time to go through security again. Flight hacking is completely allowed, but airlines don’t always tell you the cheapest way to get from IAD to ILY — but Champion Traveler does!

Hack #1: Glasgow (IAD > GLA > ILY)

  • Price for both tickets: $883
  • Average savings: $8 (0.9%)

See IAD to GLA flights


Flight Questions Answered

Still have questions about flying from IAD to ILY? We’ve got answers.

Which airlines fly this route?

You can find 8 major airlines flying this route most often: Aer Lingus, Air Canada, British Airways, KLM, Loganair, Lufthansa, Singapore Airlines, United, and potentially more during busy seasons.

How far away is it from Islay Airport to Washington Dulles International Airport?

The distance between the two airports is roughly 3362 miles or 5411 kilometers.

How long does it take to fly from IAD to ILY?

The real-world flight time for a nonstop IAD to ILY flight is about 7 hour 2 minutes.

How many flights go between Washington, DC and Islay?

It depends on the day of the week and the date, but a typical day might have around 18 available flights from IAD to ILY.


Airport Location Info


Departing Airport

Origination codeIAD
Origination airport nameWashington Dulles International Airport
CityWashington, DC
Countrythe United States

Return Airport

Destination codeILY
Destination airport nameIslay Airport
Countrythe United Kingdom


Other Resources

Please note that while we’ve worked hard to analyzed tens of millions of flights to get you this data, we do not calculate current live prices or guarantee pricing. Please see our partners using the links above for current offers.