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DFlight API vs Weather Underground API

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

APIDFlight APIDEAD0Weather Underground APIREACHABLE100
Uptime · 30d
Uptime · 90d11.8%100%
Uptime · 30d0.0%100%
P50 · ms319104
P95 · ms6681117
AuthnoneapiKey
CORSnoyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree — limits not publishedFree tier — API key may be required for production
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

DFlight API vs Weather Underground API: common questions

Which is more reliable, DFlight API or Weather Underground API?

On our scheduled checks, Weather Underground API leads on measured uptime — DFlight API at 11.8% versus Weather Underground API at 100% over 90 days. These are our own probe results, not provider claims; the uptime bars above show the day-by-day record for both.

Which is faster, DFlight API or Weather Underground API?

Weather Underground API has the lower median latency in our checks — DFlight API responds in 319 ms versus Weather Underground API at 104 ms (P50). Tail latency (P95) is in the table above; for most workloads the median is the number that shapes how the API feels.

Do DFlight API and Weather Underground API need an API key?

DFlight API needs no key, while Weather Underground API requires a free API key. If you want to start calling without signup, reach for DFlight API first.

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

Only Weather Underground API is browser-friendly — it returns CORS headers over HTTPS. DFlight API needs a server-side call or proxy, so factor that into which one fits a front-end project.

Are DFlight API and Weather Underground API free for commercial use?

DFlight API has unclear commercial terms, and Weather Underground API has unclear commercial terms. 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.