Nearly 700 flights are delayed at Denver International Airport on Tuesday as thunderstorms hinder arriving flights, according to flight data and the Federal Aviation Administration.

There were 686 delayed and 11 canceled flights as of 5:30 p.m., according to the flight tracking website FlightAware.

Most of the delays impacted Southwest and United Airlines flights.

Arriving flights are delayed by an average of 51 minutes because of thunderstorms, according to the Federal Aviation Administration. Departing flights may also be delayed because of arrival delays, the agency said.

Severe thunderstorms dropped baseball- and softball-sized hail on the Eastern Plains on Monday, and intermittent storms are forecast through this week, National Weather Service forecasters said Tuesday.

This is a developing story and may be updated.

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