SvelteKit on Fly.io
Fly.io publishes its own guide for deploying SvelteKit.
Svelte application framework that targets different deployment platforms through adapters.
What SvelteKit needs.
Every host claims to run SvelteKit, so the claim on its own decides nothing. These are the things SvelteKit actually requires from the platform underneath it, and what Fly.io publishes about each. Fly.io documents 2 of the 4.
Max request duration
Not documented
SvelteKit load functions and form actions run on the server per request, bounded by this ceiling.
Edge network
Limited
The adapter decides where handlers run. An edge network is what makes the edge adapters worth choosing.
Sources (1) →Sources ↓
- The Fly.io Architecture — Fly Docs ↗
“We broadcast and accept traffic from ranges of IP addresses (both IPv4 and IPv6) in all our datacenters. When we receive a connection on one of those IPs, we match it back to an active customer application, and then proxy the TCP connection to the closest available microVM.”
Read 2026-09-05 · official docs
Build minutes
Not documented
Prerenderable routes are resolved at build time, so build allowance scales with the size of the site.
Scales to zero
Supported
Adapter output is usually a function per route. Scaling to zero removes idle cost at the price of a cold start.
Sources (1) →Sources ↓
- Automatically stop and start Machines · Fly Docs ↗
“Use autostop/autostart to automatically start and stop or suspend existing Machines based on incoming requests. [...] you don't pay for their CPU and RAM when they're in a stopped or suspended state.”
Read 2026-09-05 · official docs
What Fly.io documents.
Fly.io publishes its own guide for deploying SvelteKit.
Before you can deploy your SvelteKit app, you need to adapt it for your deployment target.
Sources (1) →Sources ↓
- Run a SvelteKit App · Fly Docs ↗
“Before you can deploy your SvelteKit app, you need to adapt it for your deployment target.”
Read 2026-09-05 · official docs
What it costs to run there.
- Pricing model
- Usage-based, no compute plan tiers
- When you exceed a cap
- No plan cap to exceed — Fly bills per second for provisioned resources. The only documented enforcement is unspecified automated scaling limits, which surface as an error message (platform-wide, all plans)
- Regions
- 18 regions
Sources (2) →Sources ↓
- Fly.io pricing ↗
“Plans get complicated, so we just charge based on usage. Billing is based on the resources provisioned for your apps, pro-rated for the time they are provisioned.”
Read 2026-09-05 · official docs
- Fly.io regions ↗
“You can host your apps in any of the following regions — including ams (Amsterdam, Netherlands), nrt (Tokyo, Japan) and syd (Sydney, Australia).”
Read 2026-09-05 · official docs
Whether it suits you.
Workloads that ship as Docker images and need placement in particular regions. Billing is purely usage-based with no plan tiers, which suits spiky or region-pinned traffic better than a flat monthly fee.
Consider something else if…
You want a predictable flat bill rather than charges that track the resources provisioned for each app.
Visit Fly.io documentation