Best way to travel between

Rennes
Porto
Travel Modes
Price
Distance
Duration
CO2
bus
$86.52
1489.6 km
21h 55mins
44.69 kgs
 
flight
$183.82
958.02 km
5h 4mins
103.47 kgs
 
drive
$207.06
1424.69 km
13h 43mins
182.36 kgs
 
train
$262.6
2094.66 km
20h 37mins
111.02 kgs
 
Tranport Distance Time(hrs) Cost(local) Cost(usd)
Bus 1489.6 km 21h 55mins 64 EUR 86.52
Flight 958.02 km 5h 4mins 135 EUR 183.82
Drive 1424.69 km 13h 43mins 152 EUR 207.06
Train 2094.66 km 20h 37mins 193 EUR 262.6
Take Bus from Rennes to Niort
Time: 3h 25mins Cost: 10 EUR; $ 12.6 - 15.4 USD CO2 Emission: 7.65 kgs
Take Bus from Niort to Porto
Time: 17h 30mins Cost: 52 EUR; $ 63.0 - 77.0 USD CO2 Emission: 37.04 kgs
Source: Rome2rio

Mode of travel comparision chart

The best and cheapest way to get from Rennes and Porto is to travel by bus, which will cost about 64 EUR or 78.30 USD.