When do flights to your cruise open?
Airlines sell seats on a rolling window, usually about 11 months ahead, so the flights for a sailing do not all exist the day you book the cruise. Pick your port and sailing to see which airport to fly into and when those flights open. A timing guide, not a fare quote.
Choose your embarkation port to see your flight plan.
Choose your sailing date to see the booking window.
For an international cruise gateway, booking two to five months before departure usually balances fare and seat availability. Business and first cabins are limited, so they reward booking earlier in that window. A cruise gives you no slack if a flight slips, so plan to arrive at least a day before you sail.
When you book the sailing with me, I set a watch on this route and flag it the moment it opens, then again when the fare looks right, and I can book the flights for you when you are ready. You keep your airline and your miles, or hand it to me.