Antelope Canyon Alternative Tours For boat tours in the Lake Powell area, visit Lake Powell Resort & Marina at yes, the Grand Canyon does have a website for tourists:
Fixed wing airplanes depart daily from the Page Municipal Airport (PGA).
You might have to cross it off your wish list, or resign yourself to taking a day tour there.
Swinging through on your way from Page to Flagstaff would be doable, but would make for a long day: 2 hours from Page to Monument Valley, then 3 hours from Monument Valley to Flagstaff.
As for availability of later departures, it depends on the time of year you’re traveling.
For instance, if you’re visiting between May 15th and August 31st, there’s a later departure of the tour at PM.