Getting to the San Juan Islands from other areas in the world is really quite easy. Most travelers flying into Seattle will be arriving at SeaTac Airport and making their way to the San Juans from there. The easiest way to get to the San Juans from Seattle is by float plane but a ferry leaves from Anarcortes as well, only a few hours drive away. Be sure to spend some time in Seattle with its famous Pike Place Market and the Space Needle.
Another option to consider is flying to Vancouver in British Columbia, Canada. Seaplane flights make getting to the San Juans easy and BC Ferries and Washington State Ferries provide service to the Gulf Islands in Canada and the San Juan Islands just south of the border. The ferry to San Juan Island leaves from Sidney on Vancouver Island. Vancouver is known to be one of the prettiest cities in the world while Victoria on Vancouver Island is a charming city with a bit of England thrown in. The Butchart Gardens are definitely worth a visit.
If flying here from England, it might be convenient to leave your car at the airport. Parking4less can arrange the details for you regardless of what city you are flying from.
The San Juan Islands seem like a far away destination but with modern jets your trip can become reality easily.