DFlight API vs US Weather
Same instrument, two spec sheets — measured, not claimed.
DFlight API vs US Weather: common questions
Which is more reliable, DFlight API or US Weather?
On our scheduled checks, US Weather leads on measured uptime — DFlight API at 23.0% versus US Weather 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 US Weather?
US Weather has the lower median latency in our checks — DFlight API responds in 182 ms versus US Weather at 163 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 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.