A flash flood watch issue Friday led to the cancelation of over 800 flights departing Chicago airports.

The watch effecting the Chicagoland Area was issued about 1:45 p.m. and is expected to extend until 3 a.m. Saturday, the National Weather Service said.

Flash Flood Watch has been issued for the Chicagoland area thru late tonight (9/27). Airlines at ORD are currently reporting significant delays & have cancelled nearly 400 flights. Check status w/ carrier. @NWSChicago pic.twitter.com/ZSn2uv1Fa2 — O'Hare Intl. Airport (@fly2ohare) September 27, 2019

Travelers were advised to check their flight status with airlines. As of 5 p.m. O’Hare reported 738 flights had been canceled and Midway reported 65, according to the Chicago Department of Aviation.