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Cascade Airways was an airline in the northwest United States which flew primarily regional air routes out of Seattle, Washington. Founded in 1969, it operated for 17 years and was shut down in 1986. Cascade Airways served the northwest U. S., primarily Seattle, Spokane, Salt Lake City, Portland, Pasco, Pullman, Boise, and Yakima. Other points served included Wenatchee, WA, Moses Lake, WA, Walla Walla, WA (which was the location of Cascade's main maintenance base), Lewiston, ID, Idaho Falls, ID, Pocatello, ID, Kalispell, Missoula, Helena, and Butte in Montana, and Calgary, Alberta in Canada. Also served were Eugene, OR, Medford, OR; Reno, NV; Twin Falls, ID; Olympia, WA; and Richland, WA (via Pasco). When Horizon Air began operating in 1981, Cascade was then competing against a better financed airline with Horizon Air eventually acquiring Air Oregon and Transwestern Airlines. Cascade then sought help from Horizon in 1985, but Horizon subsequently backed out of the deal and Cascade was forced to cease operations in March 1986. Cascade introduced British Aircraft Corporation BAC One Eleven twinjet aircraft into its fleet in the fall of 1984. The BAC One Eleven was the only jetliner type it ever operated. Cascade was also operating Hawker Siddeley HS 748, Beechcraft 1900C, and Fairchild Swearingen Metroliner (Metro III) turboprop aircraft at this time.

On January 20, 1981, Cascade Airways Flight 201, Beech 99 N390CA, operating Seattle Yakima Moses Lake Spokane, crashed at 11:27 am PST in fog during its approach to Spokane International Airport. Of the nine aboard, seven were killed: five passengers and the cockpit crew, Captain David Weinberger and First Officer Paul Davis. Two passengers, Steven Tarnoff and James Eagle. survived the crash, explosion, and fire. It clipped Riddle Hill and crashed into the wooded hillside 4.5 mile (7 km) southwest of the airport; the NTSB investigation resulted in a determination of pilot error due to the crew using an incorrect frequency for a navigational aid and subsequently descending below the Minimum Descent Height for that approach to the airport. At the time of the crash, Cascade operated twelve Beech 99s and three Embraer Bandeirantes to eighteen cities in the Pacific Northwest. Cascade had previously acquired Richland based Columbia Pacific Airlines in November 1978, following a fatal crash of a Columbia Pacific Beech 99. Flight 23 over rotated and stalled on take off from the Richland Airport on February 10, 1978, killing both pilots and all 15 passengers. On February 18, 1972, Cascade Airways Flight 325, a Beech 99 operating Seattle Walla Walla Pullman Spokane, crashed in fog at 9:42 pm PST during its instrument approach to Spokane International Airport, and came to rest in a muddy field less than 2 mile (3 km) southwest of the runway. Two passengers and two crew were aboard, and all survived with minor injuries. The pilot, Lee M. Leslie of Spokane, walked from the crash site to a nearby service station to report it. The crash site was about from the Medical Lake exit (#272) of Interstate 90 and the landing gear of the plane was extended. Due to fog, the flight had stopped in Pasco rather than Walla Walla.