There are 1 bus company, 1 train company operating 3 routes - Coast Starlight, Empire Builder, Amtrak Cascades, 5 airlines from Seattle to Portland. The cheapest bus costs $21 and is 4h 50min. The cheapest train costs $44 and is 3h 9min. The cheapest flight costs $80 and is 45min.
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There are 4 ways to travel from Seattle to Portland. 2 buses, 4 trains, 2 flights and 1 by car are possible between the two areas. The by car from Seattle to Portland is the cheapest. The flight operated by Alaska Airlines running from SEA to PDX is the fastest. The train operated by Amtrak running from SEA to PDX is the most convenient.
It's important to check each mode when booking your ticket so that you can find the best method for you. The cost of each type varies differently, so be sure to use Faretrotter to keep an eye out!
There is only one bus company, BoltBus, with routes running from Seattle to Portland. One train provider, Amtrak, runs trains from Seattle to Portland. But, because the flight only takes 45min and costs $80, we recommend the flight. Although, the prices for flights vary drastically more so than buses or trains, so as you get closer to your date of travel, the likelihood of finding a cheap flight gets smaller.