Severe weather, including thunderstorms, high wind gusts, hail, flash flooding and possible tornadoes across a large swath of the country have caused travel disruptions on Wednesday at many U.S. airports.

The main threat for severe weather will ramp up Wednesday evening from central Michigan to north-central Texas, according to AccuWeather.

But flight cancellations and delays are widespread nationwide, according to flightaware.com.

As of 4 p.m., there were 439 total cancellations and 5,021 total delays affecting travel at airports within the United States.

Departing Flights – Top 5 U.S. airports with delays, cancellations:

• Chicago O’Hare International (ORD): 39 cancellations, 290 delays

• Reagan National (DCA): 38 cancellations, 112 delays

• Philadelphia International (PHL): 35 cancellations, 43 delays

• John F. Kennedy International (JFK): 27 cancellations, 96 delays

• Boston Logan International (BOS): 20 cancellations, 94 delays

Arriving Flights – Top 5 U.S. airports with delays, cancellations:

• Chicago O’Hare International (ORD): 45 cancellations, 397 delays

• Reagan National (DCA): 38 cancellations, 120 delays

• John F. Kennedy International (JFK): 31 cancellations, 127 delays

• Philadelphia International (PHL): 30 cancellations, 76 delays

• LaGuardia (LGA): 15 cancellations, 212 delays

Top 5 U.S. airlines with travel disruptions:

• Southwest Airlines: 67 cancellations, 903 delays

• American Airlines: 51 cancellations, 493 delays

• United Airlines: 24 cancellations, 428 delays

• SkyWest: 50 cancellations, 312 delays

• Envoy Air: 9 cancellations, 151 delays

Generative AI was used to summarize the list, which was reviewed and edited by NJ Advance Media staff.

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Chris Sheldon may be reached at csheldon@njadvancemedia.com.