The best time to book a flight to Washington, D.C. Dulles Intl Airport with Korean Air is 58 days before departure. On average, fares are higher if you book 50 days before departure.
For Economy Class flights the cheapest month to fly the route is November. The most expensive months are July and August.
In terms of precipitation, rainfall in Washington, D.C. Dulles Intl Airport ranges from 66.0 - 102.0 inches per month. May is typically the wettest month, when rainfall can reach 102.0 mm. February is typically the driest time to visit Washington, D.C. Dulles Intl Airport when rainfall is around 66.0 mm.
If weather is an important factor for your trip to Washington, D.C. Dulles Intl Airport, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 27.0 C. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 2.0 C).
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