The cheapest times to fly from IAD to POS are

  • January 8th to February 11th
  • February 26th to June 10th (except the weeks of April 2nd, April 30th, and May 7th)
  • September 10th to November 11th

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 POS is late May to early June. Prices can be as high as $1243 for Thursday flights during early August, or as low as $355 for Tuesday flights around late May to early June.


When to Fly to Port of Spain

Flying from Washington, DC (IAD) to Port of Spain (POS) will usually cost between $362 to $722 per person if booking more than four weeks in advance. On average the very cheapest time to fly is late May to early June with an average ticket price of $355. Due to high demand the most expensive time to fly is early August, with an average price of $774. Planning your trip to low-cost times can easily save you $419 on economy flights and even more on first-class flights. Generally, any price below $431 can be considered a good price for a round-trip IAD to POS flight.

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

IAD to POS Flight Prices

Compared to other flights, the IAD to POS flight is much cheaper than the average and costs much less than the average flight leaving from Washington. The average price per mile (for a direct flight) is $0.12, which is far below average.


Flight Prices by Day of the Week

Tuesday is usually the cheapest day to depart and return on this flight. Thursdays are the most expensive days to fly to Port of Spain, and Sundays are the most expensive days to return to Washington. Selecting flights on the least expensive days could save you up to $75 (13%) on this flight.

Departing prices are for round-trip flights returning on the day of departure. For example, a flight departing on Tuesday and returning a week later will cost an average of $432. Return trip prices are from the POS 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 POS can generally find a 1-layover flight. Because there is not usually a direct flight option the real-world direct flight time of 4 hour 56 minutes may not be realistic.


Flight Questions Answered

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

Which airlines fly this route?

You can find 7 major airlines flying this route most often: Air Canada, American, Avianca, Caribbean Airlines, COPA, United, WestJet, and potentially more during busy seasons.

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

The distance between the two airports is roughly 2196 miles or 3534 kilometers.

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

The real-world flight time for a nonstop IAD to POS flight is about 4 hour 56 minutes.

How many flights go between Washington, DC and Port of Spain?

It depends on the day of the week and the date, but a typical day might have around 38 available flights from IAD to POS.


Airport Location Info


Departing Airport

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

Return Airport

Destination codePOS
Destination airport namePiarco Airport
CityPort of Spain
CountryTrinidad and Tobago


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.