Other than Mint, no. DL used to operate a single plane w/ lie-flats, but it wasn't a red-eye, and it does seem to have disappeared from the future schedule.
What's wrong w/ Mint? Great product.
Alternatively, SFO is only a ~2 hour flight from SEA and from there AA, UA, DL, and B6 (basically everyone except AS) offer lie-flats.
Edit: Cathay Pacific also operates a fifth-freedom redeye from YVR (even closer than SFO). However I imagine tickets are quite pricey.