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DFlight API vs US Weather

Same instrument, two spec sheets — measured, not claimed.

APIDFlight APIUNMONITORED—US WeatherNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
Authnonenone
CORSyesyes
HTTPSyesyes
Card requirednono
Commercial useunclearyes
Data licenseUnverifiedU.S. Government work / public domain
Free tierFree — limits not publishedFree (US Government public data)
Rate limitUnpublishedUnpublished (asks for a User-Agent identifying your app)
In directory since2026-07-052026-07-05
operationalpartialdownno data

DFlight API vs US Weather: common questions

Which is more reliable, DFlight API or US Weather?

Only US Weather is on our probe schedule so far (—% uptime over 90 days). The other is catalogued but not yet live-checked, so we can't compare measured reliability head-to-head — check the uncovered API's own status page for now.

Do DFlight API and US Weather need an API key?

Neither needs a paid key — DFlight API is callable with no signup, and US Weather is callable with no signup. Both are quick to prototype with; rate limits still apply.

Can I call DFlight API and US Weather from the browser?

Yes — both DFlight API and US Weather send CORS headers over HTTPS, so front-end code can fetch either directly with no backend proxy. That makes them easy to swap in a client-side app while you compare responses.

Are DFlight API and US Weather free for commercial use?

DFlight API has unclear commercial terms, and US Weather allows commercial use on its free tier. We track service terms and the data license as separate fields — see the Commercial use and Data license rows above, and confirm both before shipping either in a paid product.