Probably not what everyone would consider sci-fi, but if you can find the abridged versions (*stay with me) read by Tony Robinson, the Discworld audiobooks are really enjoyable to listen to.
Good Audio Sci-Fi
- Snow Crash
- The Martian (more fictional science than sci-fi, but still excellent)
- Ringworld series
- Daemon
- Freedom
- Gateway
- Beyond the Blue Event Horizon
*Unfortunately, the unabridged versions were read by Nigel Planer and Stephen Briggs and neither of them capture the characters in the same way Robison does.
Paper Girls, Vol. 1by Brian K. Vaughan
The Long Cosmosby Terry Pratchett, Stephen Baxter
Sleeping Giantsby Sylvain Neuvel
The Buntline Specialby Mike Resnick
Star Nomadby Lindsay Buroker
Too Like the Lightningby Ada Palmer