Here's a great 2-for-1 trip you can take from Vancouver. Fly from Vancouver to both Bangkok and Tokyo for $658 CAD ($527 USD) round-trip on ANA All Nippon Airlines.
Seen below, we found seats using a multi-city search, departing Vancouver YVR to Bangkok BKK on Wednesday, October 24, followed by a flight departing Bangkok BKK to Tokyo NRT on Wednesday, October 31, returning from Tokyo HND to Vancouver YVR on Wednesday, November 7.
Other dates are available for departures from Vancouver in September/October. Travel is valid on Mondays, Tuesdays, Wednesdays, and Thursdays.
If you just want to visit Bangkok, you can find lower fares around $581 CAD ($464 USD) round-trip without the multi-day stop in Tokyo. Most of these routes will require a change of airport in Tokyo, which you have to arrange on your own, so we would suggest taking advantage of ANA's stopover policy, which allows you to add a multi-day stopover in Tokyo for an extra $100.
For a complete look at deals to Thailand, have a look at our Bangkok page.
Need a room in Bangkok or Tokyo? Have a look at what's available on Hotelwatchdog.