Should I buy supplemental liability (SLI) at SeaTac?
Verified: 2026-06-08
At a glance
Consider SLI if your personal auto policy doesn't extend to rentals or limits are below $1M umbrella needs.
What to know
Tables, fee breakdowns & trip planning — not a raw data dump
Planning your rental
Shuttle & pickup
Terminal Islands 1 & 16 → CONRAC (3150 S 160th St, SeaTac, WA 98188)
| Band | Wait | Note |
|---|---|---|
| Off-peak | 5–8 min | Weekday daytime |
| Peak | 10–15 min | Rush hours |
| Friday PM | 12–18 min | ~6 PM band |
Out-the-door fees
| Kayak base rate | ~$57/day |
| Facility charge (CFC) | $7/day |
| Concession recovery (ACRF) | 11.1% (~$6/day) |
| Est. out-the-door | ~$70/day |
What to expect on your trip
- Supplemental Liability Insurance (SLI) raises third-party bodily injury and property damage limits beyond the rental's state-minimum package.
- Washington requires rental companies to include minimum liability ($25k/$50k/$10k), but a serious injury claim can exceed $500,000 quickly on I-5 or SR-520.
- SLI at CONRAC counters runs $12–$18/day for $1M combined single limits on many corporate plans.
- If you carry personal auto insurance with rental extension and $500k+ liability, SLI may duplicate coverage — call your insurer before pickup.
- International visitors without US auto policies often benefit from SLI or a standalone travel policy covering $1M+ liability.
Honest heads-up
Know this
Kayak averages hide CFC (~$7/day) and ACRF (11.1%) stacked on base rates. Compare all-in daily cost, not headline $/day.
Know this
Deposit holds are often confused with charges. At CONRAC, holds typically release 5–14 business days after return depending on bank batching.
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