It is will be very challenging period for pre-Christmas travel in many parts of the United States. Many flights are likely to be cancelled and plans disrupted. An Arctic air mass with cold temperatures, strong winds, icing and snow will move down into the United States creating these areas of travel alerts. The National Weather Service has issued a blizzard warning for the Great Lakes area making travel very difficult in many areas.

Chicago’s two airports are likely to be very impacted. However many other airline hubs will also be inpacted.

We've got chills just looking at this forecast 🥶

⬇️ This shows high temps Tue-Sun, the color represents the departure from average. Many will experience MUCH below average temps this week, ~20-30° or more below. Keep in mind, wind chill will make it feel even colder than this! pic.twitter.com/4fGd3lXdoP

— NWS Weather Prediction Center (@NWSWPC) December 20, 2022

Delta Air Lines has issued these warnings:

Pacific Northwest:

The forecasted path of the Pacific Northwest Winter Weather may impact travel to/from/through the destination(s) listed below. Check flight status frequently for up-to-the-minute information about your flight plans, or get updates sent directly to your mobile device or by email with One-Time Flight Notification.

Midwest and Central Plains:

The forecasted severe winter weather of Midwest and Central Plains may impact travel to/from/through the destination(s) listed below. Check flight status frequently for up-to-the-minute information about your flight plans, or get updates sent directly to your mobile device or by email with One-Time Flight Notification.

Atlantic and Northeast Region:

A cold front moving through the northern Rockies, northern Plains, and upper Midwest Wednesday will bring areas of gusty winds, heavy snow and snow squalls, and a sharp drop in temperatures. pic.twitter.com/ePIAPLBGaP

— National Weather Service (@NWS) December 21, 2022

Meanwhile United Airlines issued this travel alert: