Yuck! I always hate these decisions. I had to do this in April, because of my grandma's death. She spent a lot of time helping raise me so it was only a question for me if my husband would go or not. He could not get any time off work, so that sort of made it for us. This may sound horrible, but I thought about it when I came over. I made the decision before coming which funerals I'd go to and which I wouldn't. Also, I had a plan of what to do when it did happen and I had to go. We also set aside some 'emergency funds' for this situation. (Not that this helps you now). It sounds horrible, but when it happened, that always helped.
All this was to say, (sorry, I'm long winded) that I think you have to assess how important the person was to you, and how important it is for you and your husband to be there? I think that's how you find your answer. I'm so sorry for your loss!