The best time to travel from Earth to Mars is during a launch window, which occurs roughly every 26 months when the planets are positioned for a more fuel-efficient journey. A typical transfer takes about six to nine months each way.
Mars and Earth orbit the Sun at different speeds. Launching at the right point allows a spacecraft to follow an efficient route; launch opportunities usually last for several weeks. Mars being closest to Earth is not, by itself, the ideal departure date—the planets’ positions along their orbits matter too.
For a future surface visit, the best season would depend on the landing site and mission goals. Martian seasons affect daylight, temperatures, and weather, and large dust storms can sometimes develop. There are no human trips or tourist visits to Mars yet, so travel dates remain a matter of mission planning rather than booking.
Practical takeaway: For spacecraft, plan around the approximately 26-month Earth–Mars launch cycle. For a future crewed visit, the safest season will depend on the destination and conditions at the time.