About DelayAtlas

One job: turn the DOT's on-time performance database into decisions a traveller can act on, without exaggerating what the data supports.

That means publishing the sample size next to every percentage, refusing to build a page around an operation with too few flights to judge, showing cancellation rates beside punctuality rates, and stating on every page which twelve months the figures cover. It also means saying plainly when a difference is too small to matter, which is a sentence most comparison sites never print.

The full set of definitions, thresholds and limitations is on the methodology page, including the limitations that make the site's own numbers look less authoritative.

Travel partner links. Some pages carry links and widgets from Travelpayouts, a travel affiliate network. If you follow one and book, this site may earn a commission at no extra cost to you. That is the whole business model, and it is stated here rather than discovered.

Four things follow from it, and they are permanent editorial commitments rather than current policy:

• Partner links never change the figures. Every on-time rate, delay cause and ranking comes from the DOT records, and a route or airline scores the same whether or not a partner sells it.
• No lead selling. Nothing entered into the search box is stored, transmitted or sold. The search runs entirely in your browser against a file the page already downloaded.
• No compensation claim links where there is nothing to claim. The US has no EU-style cash compensation scheme for delays, so no US domestic page links to a claim company. Flights departing Europe and the UK for the US fall under EC 261/2004 and UK261, and only those pages carry a link to Compensair, a claim service that works for a share of a successful payout; the page states the legal test first, and that a claim can be made to the airline directly for free.
• No airline affiliation, sponsorship or advance review of content. Carriers that score badly here score badly here.

Partner links and widgets are kept apart from the data, and no partner sees a page before it is published.

Not a flight tracker. The one exception is the live status page, which shows what the FAA is reporting about airports at this moment. That is airport-level operational status, not flight tracking: it will tell you an airport is under a ground delay programme, never where an aircraft is. For your own departure, use your airline's app.

Not a booking site. No fares, no availability, no inventory. The site tells you which flight has the better record; buying it is between you and the airline.

Not a claims service. It does not file anything on your behalf and takes no fee from anyone who does.

Not international. The DOT database covers US domestic flights. International segments are outside it, and inventing coverage the source does not have would be worse than the gap.

The source is public and in the public domain. Anyone can download the same monthly files and recompute every figure here. The data sources page names the exact database, and the methodology page states every threshold applied to it.

Current data covers September 2025 to August 2026 and was generated on October 22, 2026. The figures refresh monthly, automatically, from the raw filings rather than from a stored total.