First just like to say love the app.
Would be handy to have a duration on the Your trips page, and pull out the average spend per day onto this page as well. (I would hide the budget when it becomes a past trip as at this point I don’t see it being useful?)
Being able to order the items within each day would be useful. (I’m thinking for instance being able to order a list of different transport costs, not necessarily in the order they’ve been added in the app), even better would be an optional time field as well as date for each transaction. If time provided order by time, if not then fallback on entry order?