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