St Moritz to Boulogne sur Mer: Ultimate Road Trip Guide

The route from St. Moritz to Boulogne-sur-Mer spans over 800 km (500 miles) and crosses four countries: Switzerland, France, and briefly Germany and Luxembourg. This drive takes you from the Engadin valley in the Swiss Alps down to the English Channel coast. Historically, this corridor follows parts of the ancient Via Francigena pilgrimage route and later the Route des Alpes. The most direct path uses the A13 motorway in Switzerland, then the A35 in Alsace, and finally the A16 and A26 in France. The entire drive can be completed in about 8-9 hours of pure driving time, but you'll want to stretch it over at least two days to fully appreciate the diverse landscapes. The Juncture of the Rhine and Rhone watersheds near the source of the Inn River is a unique hydrological milestone along the way.

Road quality is excellent throughout, but watch for Alpine passes that may close in winter (the A13 San Bernardino tunnel is weather-proof). The Swiss A13 has many tunnels; use headlights and maintain safe distances.

• Winter driving: snow tires mandatory in Switzerland from Nov to Apr; chains may be needed for mountain passes.
• Fatigue: plan stops every 2 hours. Excellent rest areas include the 'Aire de la Haute-Meurthe' (A35) with panoramic views, and 'Aire de Champagne' (A4) with playgrounds.
• Family: stop in Colmar for a walkable old town, miniature train museum, and the 'Petite Venise' area. In Reims, the Palais du Tau and cathedral are hits with older children.
• Pet-friendly: most French rest stops allow dogs on leash; many hotels along the route are pet-friendly (e.g., Ibis Styles). Switzerland requires a pet passport for dogs.

Leaving St. Moritz, you drive through the Upper Engadin valley with views of Lake St. Moritz and the Bernina Range. The descent to Chur follows the Rhine River through the Viamala Gorge.

• Swiss National Park: detour to Zernez for pristine alpine wilderness, ibex, and marmots.
• Alsace vineyards: between Colmar and Strasbourg, stop for a wine tasting at a local coopérative.
• Champagne region: near Reims, visit Moët & Chandon or a smaller grower for a tour.
• Boulogne-sur-Mer's Nausicaá: Europe's largest aquarium, a perfect finale for families.

Local commerce thrives on alpine dairy products, especially in Switzerland where you can buy Sbrinz or Bündnerfleisch. Alsace offers gingerbread (pain d'épices) and choucroute. The Champagne region is defined by its sparkling wine, while the Opal Coast is known for seafood, particularly mussels and fish soup. For unique souvenirs, look for cuckoo clocks in the Black Forest (short detour on A5) or handmade lace in Calais near Boulogne. how to find the best stops and hidden gems between cities'

The optimal route uses the Swiss A13 (San Bernardino route) to avoid the Gotthard tunnel queues, then the A3 to Basel. After crossing into France, take the A35 through Alsace, then the A4 towards Reims, and finally the A26 and A16 to Boulogne-sur-Mer. Tolls apply on French motorways, totaling around €40-50. Fuel prices vary: Switzerland tends to be more expensive than France.

• Swiss motorway vignette required (CHF 40, valid 14 months for most vehicles).
• French tolls: A35 (€15), A4 (€20), A26/A16 (€15). Accept credit cards or cash.
• Rest stops: every 30-50 km along French motorways; Swiss rest stops are less frequent.
• Speed limits: 120 km/h on Swiss motorways, 130 km/h on French motorways (110 km/h in rain).