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KnowDelay uses easy-to-understand traffic lights to depict predicted flight delays of over 30 minutes:

Score: green  Green means low likelihood.
Score: yellow  Yellow means moderate likelihood.
Score: red  Red means a high likelihood.
Use the Slider to view our demo forecast.

Members can use our interactive Delay Map and benefit from:

Proprietary airport delay predictions

Easy to understand “traffic lights”

Members enjoy our full 3-day tailored delay predictions:

Customized delay predictions tailored to member itineraries

Flight alternatives specific to member itineraries

Proactive email notifications

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KnowDelay provides delay predictions for the 35 most delay-prone airports in the US, shown below. While other airports can occasionally experience delays, they represent a very small percentage of flight delays. While these airports are not included in our predictions, the KnowDelay team monitors every itinerary and provides updates.

  • ATL
    Hartsfield-Jackson Atlanta International Airport
  • BNA
    Nashville Metropolitan Airport
  • BOS
    Logan International Airport
  • BWI
    Balt./Wash. International Airport
  • CLE
    Hopkins International Airport
  • CLT
    Douglas Airport
  • CVG
    Cincinnati/Northern Kentucky Airport
  • DCA
    Ronald Reagan National Airport
  • DEN
    Denver International Airport
  • DFW
    Dallas/Ft. Worth International Airport
  • DTW
    Wayne County Airport
  • EWR
    Newark Liberty International Airport
  • FLL
    Ft. Lauderdale International Airport
  • IAD
    Dulles International Airport
  • IAH
    George Bush Intercontinental Airport
  • JFK
    John F. Kennedy International Airport
  • LAS
    McCarran International Airport
  • LAX
    Los Angeles International Airport
  • LGA
    La Guardia Airport
  • MCI
    Kansas City International Airport
  • MCO
    Orlando International Airport
  • MDW
    Midway Airport
  • MIA
    Miami International Airport
  • MSP
    St Paul International Airport
  • ORD
    O'Hare International Airport
  • PDX
    Portland International Airport
  • PHL
    Philadelphia International Airport
  • PHX
    Sky Harbor International Airport
  • PIT
    Pittsburgh International Airport
  • RDU
    Raleigh/Durham Airport
  • SAN
    San Diego International Airport
  • SEA
    Seattle/Tacoma International Airport
  • SFO
    San Francisco International Airport
  • SLC
    Salt Lake City International Airport
  • TPA
    Tampa International Airport