The zero-fuel aeroplane, Solar Impulse, is aiming to complete its Atlantic crossing on Thursday.
Pilot Bertrand Piccard will bring the craft down around sunrise in Seville, Spain, depending on the agreement of local air traffic controllers.
The Swiss adventurer has made swift progress over the ocean since leaving New York on Monday.
The current flight is the 15th stage in Solar Impulse’s bid to circumnavigate the globe.
Once in Seville, mission managers will plot a route to Abu Dhabi where the venture began in March, 2015.
The project had hoped to end the Atlantic leg in Paris, to echo the pioneering flight in 1927 of Charles Lindbergh.
His Spirit of St Louis aircraft was the first to make the solo crossing.
As it turned out, the forecast this week in Paris was for storms, and so Seville was therefore chosen as the safest option.
“We expect the landing [on Thursday] at sunrise,” said flight director Raymond Clerc.
“In case we have a technical problem it could be earlier.
“We’ll have two or three hours holding over the sea before the Spanish coast, but in the case of a technical problem we will proceed straight to Seville.
“The team is already in Seville; they are preparing everything.”
Solar Impulse has moved rapidly around the Earth since renewing its challenge in Hawaii on 21 April.
In 2015, the plane flew eight stages from Abu Dhabi to Kalaeloa, including a remarkable four-day, 21-hour leg over the western Pacific – the longest solo flight in aviation history in terms of the time it took.
But it was damage to its batteries on that stage that forced Solar Impulse to then lay up for 10 months, for repairs and to wait for optimum daylight length in the northern hemisphere to return.
Solar Impulse is covered in 17,000 photovoltaic cells.
These either power the vehicle’s electric motors directly, or charge its lithium-ion batteries, which sustain the aircraft during the night hours.
The project is not really intended to be a template for the future of aviation, but rather a demonstration of the capabilities of solar power in general.
Mr Piccard’s shares the flying duties with his business partner, Andre Borschberg.
The former Swiss air force pilot will take charge for the leg across the Mediterranean.
Setting off from Seville will be easier than from Paris in this respect, said project team-member Yves Andre Fasel who liaises with air traffic control.
“If we would have arrived in Paris like we wished, it would have been very complicated because we would have had to cross a lot of air traffic controls.”
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)
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