Schedule

Location	City	Bus Route	Times							Fare
2nd & University	Seattle	Sound Transit 590 Series	6:07 AM	6:57 AM				11:57 AM	12:27	$3.50
SR 512 P & R	Lakewood	Sound Transit 590 Series	7:06	8:16				13:16	13:46	$3.50
SR 512 P & R	Lakewood	Intercity Transit 603 605 or 612	7:30		8:00	8:30			13:50	$2.50
11th & Capitol	Olympia	Intercity Transit 603 605 or 612	8:10		8:40	9:15			14:35	$2.50
11th & Capitol	Olympia	Intercity Transit 12.pdf 12, 13.pdf 13, or 68.pdf 68	8:10		8:40				14:50	$1
Tumwater Square	Tumwater	Intercity Transit 12.pdf 12, 13.pdf 13, or 68.pdf 68	8:15		8:45				14:55	$1
Bike 30 miles to Chehalis or try an obscure transfer^{(1 or 2)}
Walmart	Chehalis	CAP Rural Transit				9:05	15:05		16:05	$1
Longview Transit Center	Longview	CAP Rural Transit				10:00	16:00		17:00	$1
Longview Transit Center	Longview	CAP Rural Transit				12:10	16:10		17:10	$1
Stops along this route			Kalama, Woodland
Salmon Creek P&R	Salmon Creek					13:05	17:05		18:05
Salmon Creek P&R	Salmon Creek	C-Tran 105: I-5 Express or 134: Salmon Creek Express				13:32	17:09		18:32	$3.35
SW 6th & Columbia	Portland	C-Tran 105: I-5 Express or 134: Salmon Creek Express				14:18	17:55		19:18	$3.35
Total Time		6 hours 51 minutes	Total Price							$12.35

Notes

On Mondays and Fridays ONLY, you can take Greys Harbor Route 40 from Olympia to Elma, Transfer to GHT Route 90 from Elma to Centralia Amtrak, Take Twin Transit Route 30 or 42 from Centralia Amtrak to Chehalis Walmart where you can catch a CAP transit bus to Longview, WA where you may continue your journey to Vancouver, WA and Portland, OR.
According this article by rebels by bus, if you are a resident of Thurston County you can: 1) take intercity transit from Downtown Olympia to Tumwater Square then pick up from there 2) Rural transit bus to Centralia transfer to 3) Twin Transit to Chehalis Walmart then pick up 4) CAP Transit from there