I'm so sorry about your grandman. I can understand, I was unable to go to my grandma's funeral due to some crappy communication from my work at the time and I still regret it. It's ok to have some sad days! Try to focus on some happy memories of her that make you laugh. Tell them to us and share a little bit of her!
Hehe cute story about your grandma. I'm so sorry to hear about her passing, but I agree with pp that airlines offer bereavement discounts- call them and they work with you for a lower rate.
I'm very sorry I lost my grandmother less than a year ago and it still gives me a sad. She suffered from dementia so she had been "gone" for awhile but it was therapeutic to do her photo collage for the funeral and remember her good years.
So, continue to focus on the good memories like the story above!