You can't predict the future, chances are it will rain during your trip. With this in mind, bring an umbrella, but if you're looking to stay relatively dry, come in July and August when the rain slows down. If you do get flights to Washington during this time, remember that it's tourist season and seats will fill fast. During this two-month span, check out the Bellevue Arts & Crafts Fair, the National Lentil Festival, and Long Beach's Washington State International Kite Festival. If you're more likely to opt for cheap flights to Washington State, aim for the winter months. The snow can fall hard, but this is perfect if you like to ski. You can also catch Christmas at the Port of Ilwaco and, if you're around in January, the Seattle Boat Show. Don't hesitate to show up any old time if these events don't appeal to you. If you book one of the many Seattle hotels, you can enjoy the Space Needle, the Museum of Flight, and the Woodland Park Zoo. Next, take the drive across Lake Washington to enjoy the Bellevue eateries, since Bellevue was named the seventh best city for food lovers in America.
Whatever your itinerary involves, make sure to search for plane tickets to Washington and hotels in Washington on Travelocity. It has over 400 airlines and more than 510,000 hotels worldwide, so you can create the exact vacation you're looking for.