World-crossing

"Blue Fairy: You will never make it to that world. Rumplestiltskin: Oh, I'll find a way. There must be other paths."

- The Blue Fairy and Rumplestiltskin World-crossing, also known as Portal Jumping in some cases, is a magical ability featured on ABC's Once Upon a Time and Once Upon a Time in Wonderland. It first appears in the first episode of the first season of Once Upon a Time.

To Magical Worlds Only
Some methods are limited only to travel between magical worlds. However, travel to worlds without strong natural magic (such as the Land Without Magic) is possible if the location has strong magic (i.e. Storybrooke).
 * Apprentice's Wand
 * Cyclones
 * Magic Doors
 * Magical Portals
 * Cyclones (to Oz)
 * Dark Fairy Crystals
 * Cyclones
 * Divine Magic
 * Genie's Wish
 * Kraken's Blood
 * Mermaid Magic
 * Rabbit Holes
 * Savior Magic + Hrunting
 * Teleportation (rarely)
 * Time Travel Spell (from one time to another, and can cross worlds)
 * Wishing Star

Specific Elements

 * Black Fairy's limited ability (from the Dark Realm to another world and immediately back)
 * Darkness (rarely, from wherever to the Vault of the Dark One)
 * Enchanted Mirrors (to the World Behind the Mirror and back)
 * Heroes and Villains book
 * Combined with the Author's Pen
 * Combined with magic key
 * Jefferson's Hats (from a magical world/location to another and back)
 * The Hat's Looking Glass (to Wonderland and back)
 * The Hat's Enchanted Forest portal
 * The Hat's Camelot portal
 * The Hat's Arendelle portal
 * The Hat's Agrabah portal
 * Door to the Land Without Color
 * Door to Victorian England
 * Oz Curtains Portal
 * Keys to the Land of Untold Stories (can turn any door into a portal to the Land of Untold Stories)
 * Lake Nostos
 * Combined with dehydrated Magic Bean
 * Combined with the Magic Wardrobe ashes + Enchanted Compass
 * Looking Glasses (to Wonderland, rarely back)
 * Pegasus Sail (to Neverland and back)
 * Savior's Wand (to the Dark Realm, rarely back)
 * Summoning spell for Mother Nature (to Mother Nature's location)

To Magical and Non-Magical Worlds
Some methods can be accomplished regardless of whether the location is a magical world or a world without strong natural magic.
 * Apprentice's Magic
 * His portal spell
 * His Magic Doors
 * Dark Curse (from wherever to Storybrooke and back if undone)
 * Magic Beans
 * Magic Wardrobe
 * Shadow flight
 * Silver Slippers

Between the Afterlife and the Mortal Worlds

 * Ale of Seonaidh (a soul from the Underworld to another world for a short period)
 * Fiery Cave (from the Underworld to a "Worse Place" or Mount Olympus)
 * Furies ability (from the Underworld to wherever and back)
 * Sleeping Curse (sends victim's soul to the Netherworld)
 * Summoning Ceremony (a soul from the Underworld to any world)
 * Underworld portal combined with blood of someone who has come back to life (to the Underworld or back)

Appearances
Note: "Archive" denotes archive footage.