There are 1 bus company, 1 train company operating 3 routes - Coast Starlight, Amtrak Cascades, Empire Builder, 4 airlines from Portland to Seattle. The cheapest bus costs $21 and is 5h 15min. The cheapest train costs $26 and is 3h 51min. The cheapest flight costs $80 and is 43min.
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There are 4 ways to travel from Portland to Seattle. 2 buses, 4 trains, 1 flight and 1 by car are possible between the two areas. The by car from Portland to Seattle is the cheapest. The flight operated by Alaska Airlines running from PDX to SEA is the fastest. The train operated by Amtrak running from PDX to SEA 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 Portland to Seattle. One train provider, Amtrak, runs trains from Portland to Seattle. But, because the flight only takes 43min 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.