The phrase "a set itinerary" is correct and usable in written English.
It can be used when referring to a planned and fixed schedule of activities or travel arrangements.
Example: "For our trip to Europe, we have a set itinerary that includes visits to Paris, Rome, and Barcelona."
Alternatives: "a fixed schedule" or "a planned agenda."
From 27 December to 3 January, guests - rather than having a set itinerary - will do what they please.
Other than a few dots I wanted to connect here and there, I avoided a set itinerary.
Americans had been using this category to travel to Cuba even before Obama changed the rules in late 2014, but they had to use a licensed group tour company with a set itinerary and a guide.
If budget is not an issue, then you have the freedom to keep from locking yourself into a set itinerary and to have the ability to find a city or region you particularly love and stay (or, alternatively, abandon locations you don't like).
While some people prefer to follow a set itinerary, others may want to stray a bit.
Now, to go on a people-to-people trip, you'll have to go in an organized group led by a licensed traveler provider, and follow a set itinerary.
While Wilkinson enjoyed mathematics and science as a high school student, he possessed no set itinerary for his future plans.
One set itinerary is made and students are responsible for contacting the travel agent and paying for any changes to this itinerary.
There is no set itinerary for students participating in the overnight stay program.
Savannah is the perfect city if you want to spend the day just wandering around and exploring with no real set itinerary.
And, within the adventure travel sector, iExplore marketed "privately-guided, made to order" tours (compared to the traditional packaged group tours with set itineraries) at a price point 25% less than similar tours being offered (leveraging the cost efficiencies of the internet, compared to brick and mortar agents).
