Buying tickets this far in advance, there is also a chance of schedule change. Ticket you purchase for Jan. 31, 2025 is based on the current schedule. There is possibility of schedule change twice from now and Jan. 31, 2025. When airlines load Summer 2024 schedule, and when airlines load Winter 24/25 schedule. With separate tickets, airlines will not give consideration to your connecting flights when re-accommodating you due to schedule changes.