First, a quick note for the super-fans. When people ask for "all seasons," they usually mean the nine television seasons that aired from 1974 to 1983. However, the complete story actually includes three feature-length television movies that aired after the series finale (The Last Farewell).
To watch the entire saga, you need access to: link la familia ingalls todas las temporadas ingles
If you don't mind a few commercial breaks, you can often watch the show for free. First, a quick note for the super-fans
The official "Little House on the Prairie" YouTube channel posts full episodes in English. However, they are not always organized by complete seasons in a single link. You can find playlists named "Little House on the Prairie - Full Episodes (English)." link la familia ingalls todas las temporadas ingles