Here's a list of SSS branches open on Saturdays:
evia mall-sss branches open saturday

The four Mega Branches and the four Large Branches are Open from Monday to Saturday, from 8am to 5pm.


Four Mega Branches:
Diliman Quezon City
Makati-Gil Puyat
Cebu
Davao

Four Large Branches:
Makati-Ayala
Bacolod
Iloilo-Central
Lapu-Lapu


SSS Service Offices Inside Malls Open on Saturdays


Tuesday to Saturday
9am to 6pm

Ali Mall, Cubao
Fairview Center Mall
LRT Caloocan Mall
Metrotown Mall
Montalban Town Center
Robinsons Luisita
Robinsons Metro East
Robinsons Otis
Robinsons Place Antipolo
Robinsons Place Butuan
Robinsons Place Dagupan
Robinsons Place Dasmarinas
Robinsons Place Gen San
Robinsons Place Ilocos
Robinsons Place Imus
Robinsons Place Jaro
Robinsons Place Malabon
Robinsons Place Malolos
Robinsons Place Manila
Robinsons Place Naga
Robinsons Place Palawan
Robinsons Place Roxas
Robinsons Place Starmills
Robinsons Place Sta. Rosa Market
SM North Edsa
Waltermart Guiguinto
Waltermart Makiling
Waltermart Sta. Maria
Zabarte Town Center

Tuesday to Saturday
10am to 6pm
Manna Mall
Robinsons Cagayan de Oro
Robinsons Place Lipa

Tuesday to Saturday
10am to 7pm

Insular Mandaue
Robinsons Place Las Pinas
Robinsons Place Tagum
SM Consolacion

Monday to Saturday
9am to 6pm
NCCC Mall Tagum
Robinsons Dumaguete
Robinsons Place Bacolod
Robinsons Place Iloilo
Robinsons Place Santiago

Monday to Saturday
10am to 7pm
Robinsons Fuente, Cebu
SM Cebu

Reference: SSS Newsletter, December 2018

Photo credit: SSSPh.net