I am pricing some flights from WAS to YVR. The pricing there is around $400 or so.

However, I found that if I fly to SEA, I can get a fare for around $220 or so and then I can fly from SEA to YVR for around $120 or so. Thus, I'd save around $60 for doing this.

The added bonus is that I'd get extra mileage because they'd count the SEA to YVR trip as 500 miles each way.

My question is whether or not this is allowed.

Does anyone know?

Thanks.