For most international trips, booking a business class ticket 2–6 months in advance is a***d starting point. However, the ideal timing depends on your destination, travel season, airline, and how flexible you are with your travel dates.

For popular international routes, I generally recommend starting your search 4–6 months before departure. This gives you enough time to compare different airlines, departure dates, and fares without waiting until prices potentially increase. If you're traveling during peak periods such as summer, Christmas, New Year, or major holidays, booking even earlier can be beneficial.

For domestic business class flights, 1–3 months in advance may be sufficient in many cases. That said, there isn't a single booking window that guarantees the lowest price. Business class fares can change frequently based on demand and remaining seat inventory.

One strategy that can help is to track prices before booking. Start checking fares several months ahead and look for patterns. Being flexible by even one or two days can sometimes make a significant difference in the price. You can also compare nearby airports and different airlines to find better options.

If you're traveling on a flexible schedule, don't necessarily assume that booking extremely early will always give you the cheapest business class fare. Airlines sometimes release promotions or adjust pricing later.

I also recommend comparing fares across reputable booking platforms and airline websites before making a final decision. Services such as BusinessClassASAP can be useful for travelers who want to compare business class options and look for competitive fares.

Ultimately, 2–6 months ahead is a practical range for many travelers, while peak-season or highly popular routes may require more planning. The key is to start monitoring prices early rather than waiting until the last few weeks before your trip.