Do you know what the cost difference is between CloudFront and S3 in terms of serving big files like video files?

For convenience and other reasons, I use S3 to publish some videos for a small group (~30) I teach. Wondering if serving that thru CloudFront would be cheaper.

This is especially important to me now as I'm doing this while everyone here is under voluntary self-isolation so I'm relying on video more.

Not that S3 was ever that expensive for me but if CloudFront is cheaper...