There’s an Instagram account, Kissa.Vintage.Paris, that shares weekly information on upcoming regular and pop-up flea markets in Paris. A few days before, she lists the markets for the weekend by arrondisement and includes date, time and location. Sometimes she adds what type of market ex: books, professional, antiques, etc. – which is helpful if you’re looking for something particular.
My flea market shopping style is serendipitous wanderer. I look for vintage brooches, small frames and anything miniature. I enjoy poking around and rarely spend more than 10 or 20 Euro. With my interests, some of my best luck has been at the one-off pop-up markets.
Porte de Vanves should be a good option for you. The time I was there I saw a good variety of items.
I’m going to put in a word for Puces d’Aligre. It is kind of gritty and very hit or miss but has a few things going for it. Open every day of the week but Monday, it’s in the city, not way out on the periphique. On Pl d’Aligre in the 12th arr., it’s compact and open; you can stand in one place and see every vendor. There’s a large adjacent covered food market and flower, fruit and veg vendors down the street. So that’s a bonus.
I have a France trip coming up myself mid-April to mid-May including Paris and the Loire. I’m getting excited for my flea adventures.