Singapore Airlines is our favorite way to fly! They feel like luxury, have lots of yummy in-flight meals, and decent spacing at all levels of seating. Try to find a direct flight to Singapore (SEA -> Singapore or SFO -> Singapore (approx. 17 hours) then book your additional travel. Sleep as much as you can until you get there. Keep it going with a flight to Koh Samui through Bangkok Airlines (2 hours) or stay at the honestly incredible Singapore airport hotel which is also a mall and tourist attraction. We will be trying to coordinate transportation from the Koh Samui airport to the NE side of the island (about 45 min).
Passport up! You don't need a visa to travel to Singapore or Thailand. Singapore has a quick customs online form when you arrive at the airport, signs will be very clear and in English.
We know a destination wedding is big request so your presence is truly the best gift. If you're unable to make it or would like to contribute, we started a travel support fund to provide a stipend for some of our guests who otherwise wouldn't be able to make it. https://www.zola.com/registry/reddyforever