On 18 August 1948, with about 85 hours of flying experience, and then 24 years old, she took off from Marshall Airport (now Cambridge City Airport) to Croydon, England, for the official departure point of the trip. The trip was intended to take six to eight weeks. She initially flew a single-engine Percival Proctor IV G-AJMU. She named the aircraft "Thursday's Child" (who "has far to go" in the nursery rhyme "Monday's Child"). For a navigator she was accompanied by childhood friend and Second World War RAF navigator Michael Townsend.[2][9] The 25-year-old Townsend was then a Cambridge University geography undergraduate student.[10]
Their departure was not without controversy due to the social norms of the time, and the overwhelming reaction to her endeavour was a negative one. There was outrage that she would leave her 18-month-old girl behind. The press mockingly dubbed Morrow-Tait the 'flying housewife'.[8]
They traveled by the south-eastern route. Passing south through France, then along the Mediterranean, through the Middle East to India and on to Vietnam, before turning north-east to Hong Kong and Japan. There were rough landings in Marseille (causing minor damage)[2] and Cyprus.[3] They also had to wait nearly seven weeks in Calcutta, India, to replace the engine[2][4] and finding and getting approval for extra fuel tanks to be installed in the fuselage for the long flight across the Pacific Ocean.
On reaching Japan, they were denied permission to cross Russia or use Russian airfields, lengthening their Pacific crossing. With winter approaching, they were offered an escort by an American Boeing B-17 Flying Fortress from Japan. They made the Pacific crossing on 9 November 1948; however, poor weather and radio issues meant they lost contact with their escort. They eventual reached Shemya Air Force Base in the Aleutians 13 hrs and 20 minutes later, perilously low on fuel.[2] They reportedly arrived as the B-17 was preparing to go and search for them, assuming them to be lost.[4] They continued on to the North American mainland and on 21 November 1948, they took off from Anchorage, Alaska. However, the engine developed trouble and they were forced to land on the snow-covered Alaska Highway near Tok, Alaska.[2] The situation looked bleak. They were nearly out of funds, and the aircraft was unrepairable.
Townsend returned to England to complete his studies, while Morrow-Tait set about trying to raise money to continue her journey.[3] Morrow-Tait spent four months fundraising for a new aeroplane, giving lectures, radio interviews and singing in a nightclub in Edmonton, Canada.[6] Impressed by her resolve, some Americans started a fundraising drive, and she was able to buy a 1942 Vultee Valiant (NX54084), which she christened "Next Thursday's Child".[2]
While in Seattle trying to raise funds, she met Jack Ellis, another former RAF navigator, who joined her for the next three months as navigator.[10] Restarting her trip on 9 April, but leaking fuel tanks slowed her progress, along with paperwork issues with both customs in Minneapolis and the Civil Aeronautics administration in Chicago.[10] There were stops (and more paperwork problems) in Canada. Morrow-Tait reunited with Townsend in June 1949, flying via Goose Bay, Labrador. Canadian officials reportedly told her to go home and 'look after her baby,' while denying her permission to set off on the transatlantic leg.[8] On 12 August, they departed Goose Bay, saying they were going to Dow Air Force Base in Bangor, Maine, out of Canadian airspace and away from the Atlantic.[11] The Royal Canadian Air Force sent a Avro Lancaster from Nova Scotia to escort them and see that they complied. But Morrow-Tait had other ideas and in-flight turned towards Bluie West One in southern Greenland, followed all the way by the Lancaster.[11] They then flew via Iceland to Prestwick, Scotland. On 19 August 1949, at 6:40 PM[12] they reached Croydon.[2]
There was little in the way of public notice of the completion of the journey with the press reporting 'only a few persons' were at Croydon.[12]