Yes, Interlaken is a highly popular and supportive day trip from Lucerne in 2026, as the two cities are connected by the iconic Luzern-Interlaken Express. This "Gold Standard" panoramic train journey takes approximately 1 hour and 50 minutes, winding through some of the most "High-Fidelity" scenery in Switzerland, including five crystal-clear lakes and numerous waterfalls. Because trains depart hourly, you can easily spend 6 to 8 hours exploring Interlaken, taking a boat cruise on Lake Brienz, or even heading up to the Harder Kulm for a panoramic view of the Eiger, Mönch, and Jungfrau. A grounded reality check: while the journey is seamless, it is a supportive recommendation to start your day by 8:00 AM to maximize your time in the Bernese Oberland. For a "Bujan" budget-friendly tip, this route is fully included in the Swiss Travel Pass, making it a frictionless and supportive way to see the heart of the Alps without the "hard-fail" stress of driving through narrow mountain passes.