Magic Valley Regional Airport (IATA: TWF, ICAO: KTWF, FAA LID: TWF), also known as Joslin Field, is a public use airport located four nautical miles (7 km) south of the central business district of Twin Falls, Idaho. The airport is owned by the City and County of Twin Falls. It is mostly used for general aviation but is also served by one commercial airline.

As per the Federal Aviation Administration, this airport had 29,606 passenger boardings (enplanements) in calendar year 2008, 26,991 in 2009, and 35,576 in 2010. The National Plan of Integrated Airport Systems for 2011–2015 categorized it as a primary commercial service airport.

The facility covers 1,468 acres (2.3 mi²; 5.9 km²) at an elevation of 4,154 feet (1,266 m) above sea level, approximately four hundred feet (120 m) above Twin Falls' city center. It has two runways with asphalt surfaces: 8/26 is 8,703 by 150 feet (2,653 by 46 m) and 12/30 is 3,224 by 75 feet (983 by 23 m).

For the 12-month period ending January 1, 2020, the airport had 34,611 aircraft operations, an average of 95 per day: 82% general aviation, 14% air taxi, 3% military, and 1% scheduled commercial. At that time there were 111 aircraft based at this airport: 84 single-engine, 18 multi-engine, 8 helicopter, and 1 jet.

West Coast Airlines and its successors Air West, Hughes Airwest and Republic Airlines (1979–1986) served the airport for many years. In 1954, West Coast was serving Twin Falls with nonstop Douglas DC-3 flights to Boise and Burley/Rupert in Idaho with direct service to Pocatello and Idaho Falls and connecting flights to Portland, OR (PDX) and Boeing Field (BFI) in Seattle WA. By 1960, West Coast had introduced new Fairchild F-27 turboprops with service to Twin Falls nonstop twice daily from both Boise (BOI) and Salt Lake City (SLC) as well as direct twice daily F-27 service from Seattle Boeing Field (BFI) via en route stops at Yakima, WA (YKM), Walla Walla, WA (ALW), Lewiston, ID (LWS) and Boise (BOI).

In 1968, West Coast merged with Bonanza Air Lines and Pacific Air Lines to form Air West which continued to serve Twin Falls. During this time, Air West was still operating Fairchild F-27 turboprops with nonstop flights to both Boise and Salt Lake City. According to the July 1, 1968 Air West system timetable, Twin Falls was receiving international service of a sorts at this time, which consisted of direct, no change of plane Fairchild F-27 service from Calgary in Alberta, Canada with this flight operating a southbound routing of Calgary (YYC) - Spokane (GEG) - Pullman, WA (PUW) - Lewiston, ID (LWS) - Boise (BOI) - Twin Falls (TWF) - Salt Lake City (SLC). This same Air West timetable also lists several other multi-stop flights that served the airport at this time including a southbound Boise (BOI) - Twin Falls (TWF) - Salt Lake City (SLC) - Cedar City, UT (CDC) - Page, AZ (PGA) - Grand Canyon National Park Airport (GCN) - Prescott, AZ (PRC) - Phoenix (PHX) service flown with an F-27, a northbound Phoenix (PHX) - Cedar City (CDC) - Salt Lake City (SLC) - Twin Falls (TWF) - Boise (BOI) - Lewiston, ID (LWS) - Pullman, WA (PUW) - Walla Walla, WA (ALW) - Pasco, WA (PSC) - Yakima, WA (YKM) - Seattle Boeing Field (BFI) service also flown with an F-27, and a Twin Falls (TWF) - Burley, ID (BYI) - Sun Valley, ID (SUN) - Boise (BOI) - Ontario, OR (ONO) - Baker, OR (BKE) - Portland, OR (PDX) flight operated with a small Piper PA-31 Navajo twin prop aircraft. Air West then subsequently changed it name to Hughes Airwest which in turn continued to serve Twin Falls.

The jet age arrived in Twin Falls during the early 1970s. In 1972, Hughes Airwest was operating four daily jet flights from Twin Falls with Douglas DC-9-10 and McDonnell Douglas DC-9-30 aircraft with nonstop service twice daily to both Boise (BOI) and Salt Lake City (SLC) and direct, no change of plane jet service to Los Angeles (LAX), Harry Reid International Airport (LAS), (SEA), Spokane International Airport (GEG), Hollywood Burbank Airport (BUR), Pasco (PSC), and Lewiston-Nez Perce County Airport (LWS). The July 1, 1972 Hughes Airwest system timetable stated that Twin Falls was the "jet gateway" for the Sun Valley, Idaho summer and ski resort area as the Friedman Memorial Airport (SUN) serving Sun Valley did not have airline jet flights at this time and was only served by commuter air carriers operating turboprop and prop aircraft during the 1970s. By 1975, Hughes Airwest was continuing to operate all flights into Twin Falls with DC-9-10 and DC-9-30 jets with service to Boise (BOI), Salt Lake City (SLC), Stockton (SCK), Pocatello (PIH), San Francisco (SFO), Los Angeles (LAX), Orange County (SNA), Las Vegas (LAS), Seattle (SEA), Portland, OR (PDX), Spokane (GEG) and Idaho Falls (IDA). During the ski season in early 1976, the airline had added nonstop DC-9 flights between Twin Falls and both Los Angeles (LAX) and San Francisco (SFO) which were operated only on Saturdays.

According to the February 1, 1976 Official Airline Guide, Hughes Airwest was the only airline operating jet service into Twin Falls at this time with eight DC-9 jet flights a day operated to the airport on Saturdays with a lesser number of jet flights operated on other days of the week. This same OAG also lists direct, no change of plane DC-9 flights operated from Los Angeles, San Francisco, Las Vegas, Seattle, Portland, OR, Santa Ana/Orange County, Santa Barbara, Spokane, Idaho Falls and Lewiston, ID in addition to daily nonstop DC-9 flights from Boise, Salt Lake City, Stockton, CA and Pocatello. In 1980, the airline was still operating DC-9 jet service nonstop to Boise and Salt Lake City with one stop direct flights to Burbank, Phoenix and Portland, OR as well as direct, no change of plane DC-9 flights to Seattle, Spokane and Tucson.