Are the players you're playing with located in the same country? When we matchmake we take ping of all parties into account and try to get the closest average server connection.

Custom games may default to the party leader's closest server.

deliciousjudas915

We all live in the same country, but different cities. Would that have made a difference?

Only if there's weird routing from one of the internet service providers the player is using and how they connect to our servers.

What ISP is the higher ping one using? I can chat with our riot direct team to see if there's anything in our realm of control we can adjust.

Garbleish

Encountering the same problem in SEA. 40-50 Ping when playing solo but 100-180 when in a party. We all live in the same city but have different ISPs.

The enemy team usually has drastically lower average ping than our party as well.

Which ISPs are the people you're playing with on?

Garbleish

We are from the Philippines so our ISPs are PLDT, Globe, Converge and Sky.

Okay, that's good to know. I know we have seen some erratic connections and latency for players from the Philippines on a couple of the isp's you've mentioned. We're actively working to try to see what we can do to optimize the routes for some of those ISP's.