Teleport to spawn in Minecraft creative mode
If you have cheats enabled in the world then you can use the command /kill to respawn at the spawn point. You can use the command /gamerule keepInventory true to avoid losing items on death.
You need to have cheats on for this to work. If you use the command /gamerule keepInventory true before using /kill you will die and respawn at your spawn point with all your inventory. I've done it, so I can confirm it works.