Transportation option from Uyani to La Paz?

I would like to hear what is the best transportation option from Uyuni to La Paz for it turned there is no train to La Paz .I had the bus drive from Calama in Chile to Uyuni and within 4 days I am supposed to reach La Paz for I have a flight to catch. Anyway I hoped there is direct train from Uyuni to La Paz but I was wrong so please someone tells me what would be the best transportation option from Uyuni to La Paz? Thanks!

I know it is strange but I don’t think there are any trains reaching La Paz –I was once there and was pretty much surprised when I figured out there is no train leaving La Paz. Anyway you still have another transportation option from Uyuni to La Paz –and that is a night train leaving Uyuni to Oruro –it takes about 8 hours to reach Oruro, anyway from Oruro you may catch a bus and within 3 hours you will get in La Paz. And don’t get upset for the trains and buses are usually in delay there.