From their website:-
The Red Arrows’ Hawk T1 jets will be flown to North America over three days.
This is because, as primarily training aircraft, they were not intended to refuel in the air and do not have the range to make the transatlantic crossing in one sortie.
After leaving the team’s base of RAF Scampton in Lincolnshire, UK, they will be flown via several stops, including airfields in Scotland, Iceland and Greenland, before reaching Canada and eventually Halifax – the first major location of the tour.