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 allowance
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
SvelteKit features on Fly.io
Capabilities Fly.io documents specifically for SvelteKit, with the constraint it documents alongside each.
node_adapter
Supported
In this example, to deploy your app on Fly.io, we'll install the Node Adapter. You can install it by executing the command
dockerfile_deploy
Supported
That file can be automatically generated with fly launch. This command will also generate a Dockerfile for deployment.
Sources (1) →Sources ↓
- Run a SvelteKit App · Fly Docs ↗
“In this example, to deploy your app on Fly.io, we'll install the Node Adapter. You can install it by executing the command”
Read 2026-09-13 · official docs
What it costs to run there.
- Pricing model
- Usage-based, no compute plan tiers; billing is pro-rated for the time resources are provisioned.
- 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
- 17 regions
Sources (2) →Sources ↓
- Pricing — Fly.io Docs ↗
“Plans get complicated, so we just charge based on usage. Pick and choose which pieces you need for your application; that's all you'll see on your invoice.”
Read 2026-09-14 · official docs
- Regions - Fly.io Documentation ↗
“You can host your apps in any of the following regions. Region ID Region Location Gateway MPG ams Amsterdam, Netherlands ✓ ✓ arn Stockholm, Sweden ✓ cdg Paris, France ✓ dfw Dallas, Texas (US) ✓ ✓ ewr Secaucus, NJ (US) ✓ fra Frankfurt, Germany ✓ ✓ gru Sao Paulo, Brazil ✓ iad Ashburn, Virginia (US) ✓ ✓ jnb Johannesburg, South Africa lax Los Angeles, California (US) ✓ ✓ lhr London, United Kingdom ✓ ✓ nrt Tokyo, Japan ✓ ✓ ord Chicago, Illinois (US) ✓ ✓ sin Singapore, Singapore ✓ ✓ sjc San Jose, California (US) ✓ ✓ syd Sydney, Australia ✓ ✓ yyz Toronto, Canada ✓ ✓”
Read 2026-09-27 · 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