Question : Is there an alternative to Haneda Airport (HND) for getting you to Vitoria?
Answer : Lucky for you, there is another airport near Tokyo. Narita International Airport (NRT) is 37 miles away, and over the upcoming two months, flights are being booked 10% cheaper than flights from Haneda Airport.
Question : How long do most people stay in Vitoria?
Answer : Of course you're not most people, but if you were, you'd stay roughly 10 days.
Question : Is price more important than specific travel days for you?
Answer : Saturday is your lowest-cost day to fly in March. Flexibility is paramount when booking travel plans in order to keep travel costs down.