Can you be more specific about the date you want to travel from Granada to Sevilla?
I did some checking on the Renfe website and found a variety of options for the journey from Granada to Sevilla-Santa-Justa on a variety of dates.
To me the best choice was taking an AVANT train. Those take about 2.5 hours and make several stops, but you don’t have to change trains. It's more expensive than an AVANT-MD, but that takes longer and you do have to change trains.
Note this slightly edited description for 31 May:
13.18--15.45. 2 h. 27 min.
AVANT Journey details
Train AVANT - 08525
Journey type Train with stops
Travel time 2 h. 27 min. between Granada and Sevilla-santa Justa
Route
Station Arrival Departure
Prestaciones.
Sin Restauración.
Telephone Reservation.
Toilet for people with Reduced Mobility.
Seating for people with Reduced Mobility.
Train with Accessibility for all.
Leaving at 13:18 doesn't sound miserable to me. The other AVANT departure times of 06:38 (😴 way too early) and 17:20 (arriving at 19:53) wouldn't be as good IMHO.
Go to https://www.renfe.com/es/en to search for your date.
- Put Granada in the From box.
- Put Sevilla in the To box and choose SANTA-JUSTA from the list.
- Click on the first date box and choose your date from the calendar by clicking on Accept.
- Click on the Return arrow above the first date box. The arrow will spin.
- Click on the One-way only box that appears at the bottom of the screen (at least on my tablet).
- Click on the Search for a ticket box. The results will come out sorted by Departure time and will include the basic details of departure time, arrival time, type of train journey and price.
- Select your option by clicking on the price.
- Scroll down and click on Journey details to see something like I posted above. It may be fun to choose one of the more complicated options just to see how much easier taking an AVANT train would be.
Other tips:
If the language falls back into Spanish and you're not fluent, click on the globe in the top right corner (on my tablet) to choose English, again.
Discounts for Over 60's: https://www.renfe.com/es/en/viajar/prepare-your-trip/descuentos/mayores-de-60
I took a look at the group option. It starts at 4, but appears to be only for longer distance journeys. Here's the link if you want to explore it: https://www.renfe.com/es/en/viajar/prepare-your-trip/descuentos/grupos/grupos-de-4-a-9
There's lots more info to explore on the Renfe website. I hope this helps you with the planning of your train journey(s).