Bertrand Piccard piloted the plane for a final time, steering it safely from the Egyptian capital Cairo to the UAE.
He has been taking turns at the controls with Swiss compatriot Andre Borschberg.
It brings to an end an epic, 17-leg voyage that began in Abu Dhabi on 9 March last year.
The journey took in four continents, three seas and two oceans.
The longest leg, a 8,924km (5,545-mile) flight from Nagoya in Japan to Hawaii, US, lasted nearly 118 hours and saw Mr Borschberg break the world record for longest uninterrupted solo flight.
Mr Piccard and Mr Borschberg have been working on the Solar Impulse project for more than a decade.
The pair had hoped to complete the challenge last year but progress was not quite swift enough to get the best of the weather in the Northern Hemisphere’s summer.
Solar Impulse is no heavier than a car, but has the wingspan of a Boeing 747. It is powered by 17,000 solar cells.
But the experimental design presents a number of technical challenges, with the airplane very sensitive to weather conditions.
Indeed, the passage from Cairo was very bumpy for Mr Piccard as he battled severe turbulence above the hot Saudi desert.
The cockpit is about the size of a public telephone box, with the pilots having to wear oxygen tanks to breathe at high altitude and permitted to only sleep for 20 minutes at a time.
LEG 1: 9 March. Abu Dhabi (UAE) to Muscat (Oman) – 772km; 13 Hours 1 Minute
LEG 2: 10 March. Muscat (Oman) to Ahmedabad (India) – 1,593km; 15 Hours 20 Minutes
LEG 3: 18 March. Ahmedabad (India) to Varanasi (India) – 1,170km; 13 Hours 15 Minutes
LEG 4: 18 March. Varanasi (India) to Mandalay (Myanmar) – 1,536km; 13 Hours 29 Minutes
LEG 5: 29 March. Mandalay (Myanmar) to Chongqing (China) – 1,636km; 20 Hours 29 Minutes
LEG 6: 21 April. Chongqing (China) to Nanjing (China) – 1,384km; 17 Hours 22 Minutes
LEG 7: 30 May. Nanjing (China) to Nagoya (Japan) – 2,942km; 1 Day 20 Hours 9 Minutes
LEG 8: 28 June. Nagoya (Japan) to Kalaeloa, Hawaii (US) – 8,924km; 4 Days 21 Hours 52 Minutes
LEG 9: 21 April. Kalaeloa, Hawaii (US) to Mountain View, California (US) – 4,523km; 2 Days 17 Hours 29 Minutes
LEG 10: 2 May. Mountain View, California (US) to Phoenix, Arizona (US) – 1,199km; 15 Hours 52 Minutes
LEG 11: 12 May. Phoenix, Arizona (US) to Tulsa, Oklahoma (US) – 1,570 km; 18 Hours 10 Minutes
LEG 12: 21 May. Tulsa, Oklahoma (US) to Dayton, Ohio (US) – 1,113 km; 16 Hours 34 Minutes
LEG 13: 25 May. Dayton, Ohio (US) to Lehigh Valley, Pennsylvania (US) – 1,044 km; 16 Hours 47 Minutes
LEG 14: 11 June. Lehigh Valley, Pennsylvania (US) to New York (US) – 230km; 4 Hours 41 Minutes
LEG 15: 20 June. New York (US) to Seville (Spain) – 6,765km; 71 hours 8 minutes
LEG 16: 11 July. Seville (Spain) to Egypt (Cairo) – 3,745km; 48 Hours 50 Minutes
LEG 17: 23 July. Egypt (Cairo) to Abu Dhabi (UAE)