For those who flew via New Zealand, I would be interested to hear what route you took to SJPDP - via Paris, London or somewhere else, and the easiest way home after SdC? I can't book flights until June - so plenty of time to settle dates and routes. I'm keen to avoid major festivals/holidays/anything that could cause accommodation anxiety. Please forgive me if I've broken any rules and should have started a new thread - your guidance is welcome.
In 2019 I flew via Dubai on Emirates to Madrid, stayed overnight in Dubai to recover after the 17 hour flight. If you select a set of flights that has more than 12 hour layover in Dubai then Emirates provides free accommodation but you need to tell them at the time that you buy your ticket and so either buy it via a travel agent and make sure that the travel agent knows that you want the free overnight in Dubai or book it yourself direct with Emirates but make sure that you know how to request the free overnight so that you can add it to your reservation. You can not request the free overnight once you arrive in Dubai.
I also stayed overnight in Madrid to recover and I stayed close to Atocha station in Madrid which seems like a reasonable area of the city to stay in. I have a Google Maps list of accommodation in Madrid or search on this site because there are lots of recommendations at lots of different price points. The place that I stayed in that first night in Madrid I would not recommend as they were renorvating the place and it was full of Gib Board dust everywhere. On my return I stayed at a much nicer place in the same area with a very small and clean private room.
After my night in Madrid I caught a train to Pamplona. I can't remember if you mentioned your age but if over 60 then you can get a Pensioner card which you buy that gets you cheaper train fares. They also have Tourist class train fares that are much cheaper than ordinary fares but they need to be pre-booked ahead of time and they sell out fast so if you find one then take it.
I caught a very early train from Madrid. In Pamplona I arrived (in May) early enough to catch the bus to St. Jean. There is only one bus per day from Pamplona to St. Jean. I walked from the train station to the bus station in Pamplona. It wasn't difficult. Check what dates the bus to St. Jean starts because it doesn't run all year and it may not run in April. You can also taxi to St. Jean and sometimes you can find someone to share with but it is expensive to taxi. Your alternatives are Bus to Roncesvalles and either start from there or walk to St. Jean and walk back again; walk from Pamplona to St. Jean, quite doable because you are going to turn around and walk back again or start from Pamplona.
I flew back from Madrid, didn't get an overnight in Dubai because I thought that I only had a two hour wait before catching the NZ flight but the flight to Dubai was delayed and so I missed the intended flight to NZ and had to wait 10 hours in the airport before Emirates routed me on an alternate flight home via Melbourne. I vowed "Never again", I was over 52 hours from leaving Madrid to getting into Auckland, I never slept and it just about killed me as I dragged myself home on the bus.
The only slight good thing was that Emirates emailed me just before I checked-in in Madrid with an offer of an upgrade to business class for the leg from Madrid to Dubai (short leg) which I accepted and paid for, I think about NZ$400.
If 2024 is anything like this year then April may be crowded between St. Jean and Pamplona so consider making reservations. In 2019 I left St. Jean on the busiest day in May and got through without reservations everywhere except St. Jean. Depends how resourceful you are if you want to take that option. I did take two days to walk from St. Jean to Roncesvalles, I walked half way and then caught a shuttle back to St. Jean then the next morning the shuttle dropped me back at the halfway point and so I arrived in Roncesvalles nice and early and got one of the few non reserved beds. Roncesvalles do hold a few beds back for walk in pilgrims but you need to get there early and wait in line.
Getting from Santiago de Compostela to Madrid I caught the high speed train and it was great. Very enjoyable at over 100+klms/hr or faster in places. I hadn't prebooked and it was booked out the day that I wanted to leave Santiago and so I stayed an extra night in Santiago (recommended) and took the fast train the next day. There are lots of recommendations for accommodation in Santiago here on the forum. I was lucky enough to be invited to stay with a friend and so I spent a couple of days exploring Santiago (recommended). Don't be in a rush to leave Santiago, you will want a couple of days to wind down. It is a significant event to walk from St. Jean and so don't spoil that by not allowing enough time to sit and contemplate what you have just completed.
I also allowed time to explore Madrid for a couple of days on the way home and that is definately worth it. I allowed a couple of extra weeks on at the end and I ended up using them in a variety of ways. There is plenty of things to do in Spain and it is a long way from home so don't rush home.
This year I am leaving in a week and flying via Shanghai with Virgin Atlantic who codeshare with Air NZ. Two 12 hour legs to get to London where I am overnighting then flying to Madrid where I will start walking the Camino Madrid. I will be in Spain for 12 weeks and I will walk another Camino or two as well as the Madrid.
I hope that this gives you some starting ideas.