Officials with Alaska Airlines confirmed that the airline has lowered fares for flights between Seattle and Portland, Oregon, following Monday's deadly train derailment.

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“We have dropped all fares for today and tomorrow,” an Alaska Airlines employee wrote Monday in response to a customer who asked on Twitter about airfares between the two cities.

Amtrak Cascades Train 501 was traveling between Seattle and Portland when it derailed around 7:45 a.m. Monday on an Interstate 5 overpass near DuPont, Washington. At least three people died and more than 70 others were injured.

DuPont is about 60 miles south of Seattle.

All southbound lanes of Interstate 5 were closed Monday by the derailment. Officials with the Washington State Department of Transportation said drivers should prepare for a multiday closure.

The Cox Media Group National Content Desk contributed to this report.