Newcastle, WA vs SeaTac, WA

The cost of living difference between Newcastle, WA and SeaTac, WA is dramatic. SeaTac is 57% cheaper than Newcastle, a gap that translates to thousands of dollars per year in household expenses. Newcastle has a cost index of 202 while SeaTac sits at 129, making this one of the more striking comparisons on our site. Relocating between these cities would require a serious reassessment of budget and lifestyle expectations.

On the housing front, median rent in Newcastle is $2,314/month compared to $1,637/month in SeaTac — a 41% difference. Home values follow the same pattern: SeaTac is more affordable at $483,200 median vs $1,128,200.

Median household income in Newcastle is $162,646 compared to $76,517 in SeaTac (+112.6%). While Newcastle is more expensive, its higher salaries more than compensate — residents there may actually end up with more disposable income. Looking at affordability, residents of Newcastle spend roughly 17.1% of their income on rent, less than the 25.7% in SeaTac.

Climate-wise, both cities share similar average temperatures (53.6°F vs 53.7°F). SeaTac receives more rainfall at 39.3" per year compared to 34.7" in Newcastle.