Santiago de Compostela to Porto distance
Santiago de Compostela and Porto are 192 km (120 mi) apart in a straight line and 231 km (144 mi) apart by road: about 2 hr 40 min of driving without stops, mostly on the A3 and the AP-9. Below you’ll find the route map, both halfway points, the bearing, the time difference and where every figure comes from.
By the All Map Tools Team
- By road
- 231 km (144 mi)
- Driving time
- 2 hr 40 min
- Straight line
- 192 km (120 mi)
- Driving route
- Straight line
- Straight-line midpoint
- Halfway by road
Lambert azimuthal equal-area projection centered on the midpoint. Route: FOSSGIS OSRM with data © OpenStreetMap contributors, calculated on November 1, 2026; simplified line.
The figures
| Figure | Value |
|---|---|
| Straight line | 192 km (120 mi) geodesic on the WGS84 ellipsoid |
| By road | 231 km (144 mi) fastest driving route (OSRM) |
| Driving time | 2 hr 40 min no stops, no traffic |
| Road detour | +20% 1.20 times the straight line |
| Average speed | 86 km/h (53 mph) along the route, without stops |
| Bearing | 182° (south) leaving Santiago de Compostela toward Porto |
| Midpoint | 42.0144° N, 8.5791° W near Valenza (Viana do Castelo District, Portugal) |
| Halfway by road | In Valença (Viana do Castelo District, Portugal) 116 km from each city by road |
| Time difference | 1 hour behind Porto compared with Santiago de Compostela |
| Population | Santiago de Compostela: 100,965 · Porto: 252,687 INE population register, January 1, 2025; GeoNames |
Santiago de Compostela to Porto by road
The fastest driving route is 231 km (144 mi) long and takes about 2 hr 40 min without stops or traffic. It runs mostly on the A3 (112 km) and the AP-9 (105 km).
Of the 231 km, 109 km are in Spain and 115 km are in Portugal. That’s an average of 86 km/h (53 mph). Spain’s traffic authority (DGT) recommends a break every two hours or 200 km: with 1 stop of 20 minutes, the trip takes about 3 hr. The time is OSRM’s estimate with OpenStreetMap data: no traffic and speeds somewhat below the limits, so real trips can differ.
Straight-line distance and bearing
In a straight line, the shortest distance over the Earth’s surface, Santiago de Compostela and Porto are 192 km (120 mi) apart. That’s the geodesic on the WGS84 ellipsoid, the distance “as the crow flies”.
The road is 20% longer: for every 100 km in a straight line you drive 120. That’s a normal detour between two cities. Of the 34 Spain–Europe driving pairs in this series, it ranks 30th for detour (the average is 31%).
From Santiago de Compostela, Porto lies to the south (bearing 182°), and from Porto, Santiago de Compostela lies to the north.
Halfway between Santiago de Compostela and Porto
Halfway along the straight line, 96.2 km (59.8 mi) from each city, is the point 42.0144° N, 8.5791° W. It falls near Valenza (Viana do Castelo District, Portugal, pop. 14,172), 4.7 km away. The nearest town of 20,000 people or more is O Porriño (Pontevedra, pop. 20,965), 16.7 km away.
By road, the halfway point is 116 km (71.8 mi) from each city, in Valença (Viana do Castelo District, Portugal). The nearest town of 20,000 people or more is O Porriño (Pontevedra, pop. 20,965), 14.6 km away. The two midpoints almost coincide (6.5 km apart), because the road doesn’t stray far from the straight line.
Time difference and flight
Porto is 1 hour behind Santiago de Compostela all year (Western European Time versus Central European Time): when it’s 12:00 in Santiago de Compostela, it’s 11:00 in Porto.
No flight time is given: under 500 km (311 miles) in a straight line, time at the airport outweighs time in the air.
The two cities
Santiago de Compostela has 100,965 people (INE population register, January 1, 2025) and Porto 252,687 people (GeoNames).
Frequently asked questions
How many kilometers is it from Santiago de Compostela to Porto?
192 km (120 mi) in a straight line and 231 km (144 mi) by road on the fastest route (mostly on the A3 and the AP-9).
How long is the drive from Santiago de Compostela to Porto?
About 2 hr 40 min without stops or traffic, according to OSRM with OpenStreetMap data; with 1 stop of 20 minutes, about 3 hr.
Where is the halfway point between Santiago de Compostela and Porto?
In a straight line, near Valenza (Viana do Castelo District, Portugal). By road, 116 km from each city, in Valença (Viana do Castelo District, Portugal).
What’s the time difference between Santiago de Compostela and Porto?
Porto is 1 hour behind Santiago de Compostela all year: when it’s 12:00 in Santiago de Compostela, it’s 11:00 in Porto.
Which direction is Porto from Santiago de Compostela?
South: the straight line leaves Santiago de Compostela on a bearing of 182° (0° is north and 90° is east).
Measure it yourself on the map
The same two cities, already set up in the tools: move the points, get the route by bike or on foot and download the map.
- Distance between two points Measure the distance between any two places or points on the map, in miles or kilometers.
- Straight line vs driving distance Compare the as-the-crow-flies distance with the real driving distance and see how much the road adds.
- Halfway point Find the exact halfway point between two places and see it on the map, ready to share.
- Time difference calculator Compare the time in two or more places and find a good hour to call or meet across time zones.
Similar pairs
The ones in this series whose cities are closest to these two, in case another one suits you better.
More distances from Santiago de Compostela
All distancesMore distances from Porto
Sources
- Driving route: FOSSGIS OSRM, car profile (calculated on November 1, 2026) · FOSSGIS e.V.
- Roads, streets and places · © OpenStreetMap contributors (ODbL)
- Straight line, bearings and midpoint (geodesics on the WGS84 ellipsoid) · GeographicLib (C. F. F. Karney)
- Location and elevation of Spanish cities (gazetteer and DEM) · Instituto Geográfico Nacional (CC BY 4.0)
- Location and population of cities outside Spain and the US · GeoNames (CC BY 4.0)
- Population register, January 1, 2025 · INE (Spain)
- Places near the midpoints: All Map Tools gazetteer (GeoNames, INE, IGN and Census) · All Map Tools
- Time zones (timezone-boundary-builder outlines and the IANA database) · © OpenStreetMap contributors (ODbL)
- Map: provinces (IGN), states (US Census Bureau) and countries (Natural Earth) · IGN, Census and Natural Earth
- Methodology