Konstanz to Ulm Road Trip: Scenic Drive Through Swabia

The A81 from Konstanz to Ulm covers 145 kilometers of rolling Swabian countryside. The route passes through the Hegau volcanic landscape, dotted with extinct cones like the Hohenstoffeln and Hohenkrähen. The Romans built a road near this corridor in the 1st century AD, connecting their lake settlements to the Danube frontier.

Driving time is about 1 hour 45 minutes without stops. For those wondering how long to drive Konstanz to Ulm, plan 2-3 hours with leisurely breaks. It’s absolutely worth driving Konstanz to Ulm for the layered views of vineyards, forests, and medieval towns. To find unexpected charm along this corridor, learn more about how to find the best stops and hidden gems between cities.

The primary route uses the A81 motorway, which is well-maintained with two lanes in each direction. A section near Tuttlingen climbs the Swabian Alb escarpment, with gradients exceeding 6%. Fuel stations appear every 15-20 km on the A81. The B31 road through Meersburg and Überlingen is a scenic alternative but adds 20 minutes.

Estimated fuel costs for a standard car (7 L/100 km) at €1.80/L is €18.25 one-way. Diesel vehicles cost slightly less. For electric vehicles, fast chargers are available at Singen, Tuttlingen, and Ulm. Tolls: there are no tolls on German motorways, but some tunnels near Konstanz require vignettes for Austrian sections – do not use Austrian roads on this route.

• Key highways: A81, B31, B33, B311
• Rest stops with fuel: Raststätte Hegau, Rasthof Immenstaad, Raststätte Alb.
• Coordinates for the midpoint: 48.05°N, 8.91°E (near Tuttlingen).
• Driving tip: Watch for speed cameras in construction zones.

Road surface: Excellent on A81, but B31 near Überlingen has rough asphalt. Night illumination is present on motorways but absent on secondary roads. Fog can be heavy in spring over the Swabian Alb; use low beams and reduce speed. There are no toll gates, but construction zones around Tuttlingen may narrow lanes.

Family-friendly: Legoland Deutschland in Günzburg is a 15-minute detour from the A81. The Sea Life center in Konstanz is a starting point. Children will enjoy the Modellbahn Mühle in Tuttlingen with a massive model train. For pets, dog-friendly rest stops include Rasthof Hegau with designated walking areas. Many beer gardens in villages allow dogs.

• Rest stops for fatigue: Parkplatz Schönberg (panorama), Raststätte Alb (modern facilities).
• Nap spots: Safe parking at Autohöfe in Singen or at rest stops.
• Pet-friendly gastronomy: Gasthof Löwen in Steißlingen.
• Safety tip: Emergency phones every 2 km on A81.

The route transitions from Lake Constance’s temperate shoreline to the karstified Swabian Alb. The Hegau region features extinct volcanoes, now quarried for basalt. Near Singen, the Hohentwiel fortress sits atop a 686 m plug. The Donauversickerung near Immendingen is a hydrological oddity where the Danube disappears underground seven times.

UNESCO World Heritage: The route passes near the Monastic Island of Reichenau (20 minutes from Konstanz by ferry) and the Caves and Ice Age Art in the Swabian Jura, 30 km east of Ulm. The Schussenquelle spring between Tuttlingen and Mengen is a geological highlight.

• Natural attractions: Hegau volcanoes, Donauversickerung, Schussenquelle.
• Agricultural goods: Spargel (asparagus) in spring, Spätzle-making villages, local wine from the Hegau region.
• Cultural markets: Weekly farmers markets in Tuttlingen (Thursdays) and Riedlingen (Saturdays).
• Regional cuisine: Maultaschen at Gasthof Ochsen in Mengen.