Question : Is there an alternative to Tijuana Airport (TIJ) for getting you to Copenhagen?
Answer : Departing from Tijuana Airport is not the only way to get to Copenhagen Airport. Try searching for flights from San Diego International Airport (SAN) as well. Over the next two months, flights from SAN to CPH are being priced 11% cheaper than flights from TIJ to CPH. Being only 18 miles away, it's easily accessible for most.
Question : How long do most people visit Copenhagen?
Answer : Of course you're not most people, but if you were, you'd stay roughly nine days.
Question : Is price more important than specific travel days for you?
Answer : The lowest-cost day to fly in March is Thursday. Being flexible with your travel days garners even more savings during booking.