Kia Ora Eilis
Thanks for getting in touch! Great news, you and your friend will have time to complete the whole trip travelling on the minimum travel time! If you start in Auckland on the 19th December you could get into Christchurch on either the 18th December (2 nights in Queenstown) or 19th December (3 nights in Queenstown). We aim to get into Christchurch at about 2:30pm and would advise you book a flight no earlier than 6pm. If you have time to spend a night in Christchurch it is highly recommended however it is possible to fly out that evening.
Please contact us directly on 09 336 4286 or send an email to firstname.lastname@example.org and we can create a personalized itinerary for you both!