Time Travel was a game mode in Plants vs. Zombies Online. It took place in Ancient Egypt, Pirate Seas, and Qin Shi Huang Mausoleum. Seven missions of Time Travel were playable every day since 12:00 AM CST (UTC−6:00) (but could be skipped for 50 gems). When the player completed a mission, they could break three piñatas and get rewards. The number of lawn mowers, amount of sun and number of Plant Food the player had left in the mission would transfer over to the next level, similar to the Endless Zones in Plants vs. Zombies 2, except in the Endless Zones in Plants vs. Zombies 2, the game only transfers the number of lawn mowers and Plant Food to the next level and not the amount of sun the player has accumulated. Like Endless Zones, the player started with a limited amount of starting plants and more could be obtained at the start of each level by selecting cards. However, some levels were played in Special Delivery format where the player's plants collection was not used.
- This game mode was similar to both the Piñata Party mode and Endless Zones from Plants vs. Zombies 2.