Norman OK to SEA is a nice 2 Zoner as well, and the return gives you the option of doing the California Zephyr. Out and back gives you a total of 7 train nights.
How you do the return? when I try and view trips SEA-OKC, it tells it "can't find train service matching my request".
We've considered OKC-LAX-SEA though. I think we're going to (as time permits!) do our orignal trip OKC-CHI-NOL we had booked for a few weeks ago, but then bought a house, and ended up moving in that week.....It's about as good a 1 zone award as you can get, especially since we could leave from home, rather than fly at both ends.
But would really LOVE to do the California Zephyr, but going West, there is no connection from the TE.....so, how do I do it coming East? There is aparently a way to connect to the TE via bus Galesburg-Springfield, but really DO NOT want to break the trip up with a bus ride, and can't see a way to do it from Seattle-OKC in any event. I think our best option, is to do a 1 zone OKC-CHI, stay a day or two overnight, then another 2 zone CHI-EMY. But that burns nearly a full week, when you factor in a day to fly back......one of these days......