I did the reverse bag drag this week.
I needed to leave coz for a few days to return to MSP.
Ticket prices were approx $400 more to fly direct from coz so I left from CUN.
The trip from Coz to the airport was quicker and easier than the trip from the airport to coz.
I had a noon flight and wanted to be at the airport two hours early.
I could have taken the 8 am ferry but I decided the 7 would be smarter.
Ultamar is using smaller ferrys when the demand is low. They are catamaran hulls and are fast.
We were at the dock in playa at 7:35 and by 7;45 I was at the bus station.
The taxi drivers were out front and offering rides direct to the airport.
The first guy showed me a very nice laminated price sheet and wanted over 5000 pesos for my own taxi and leave right away.
I passed on his offer and walked towards the door where the next driver said 200 pesos but we need to wait for three others.
The bus is 185 pesos and was leaving in 15 minutes at 8:00.
I said I would go with him if we left before the bus, otherwise I was getting on the bus.
He said ok just hang out for a few more minutes, and in about 5 minutes he had three other people and we left.
No stops and I was first to be dropped off, at terminal 4 by 8:45,
Plenty of time for breakfast.
I returned today from CUN to coz.
There are many choices for the return, taxi, shuttle, ADO bus, but they do not do the shared taxi thing leaving the airport.
The ADO ticket counter is by the exit door from terminal 4 and the bus left directly from the loading area outside the terminal. The bus arrived on schedule and was very prompt loading and departing.
The bus fare from the airport to playa was 208 pesos.
Made it to playa in approx 45 minutes and bought a ticket for the ultamar at the last booth before the dock.
I gave the person 200 pesos and they gave me a ticket. I looked at the ticket later and it said 220 pesos. I was told these are the tickets the street vendors use and the extra 20 pesos is how they make their commission.
Again they were running the smaller ferry.
The winjet boat pulled away from the dock before us and turned around sooner, but the smaller faster ferry caught up to the winjet in about 10 minutes and arrived at the dock in coz in 35 minutes while the winjet was still way far from the dock.
We tied up, I disembarked and walked off the dock while the winjet was still at least 5 min from the dock.
Your experience will vary based on time of day, day of the week and high season peak days.