The 477 is a weekday only bus service, the 473 runs during the week and at weekends, but is a slower journey.
It is a minumum of one hour to Los C or Las Americas, more often 90 minutes, fare is about 3 Euros with Bono.
You then have the wait for a connecting bus to the Airport, plus the journey time. Fare probably much the same.
Therefore, which ever way around, the Airport to here is likely to take the best part of 3 hours to do, maybe 2 and a good bit if your connections work out.
4 people travelling just from Los C or PDLA to Los Gigs will use up a 12 Euro bono card, so 4 people doing the entire journey will need 2 bono cards to be on the safe side.
Taxi fare circa 50E