25 brand new routes US airlines are adding in 2020, connecting cities that didn't have an air link

Allegiant Air is launching summer seasonal service between Los Angeles and Grand Rapids, Michigan beginning June 5. The twice-weekly service will connect the two cities on Mondays and Fridays using Allegiant's Airbus A320 aircraft until August 17.

Source: Allegiant Air

United Airlines is launching summer service between its Houston hub and Spokane, Washington starting June 3 until August 17. The once-daily service operated under United's regional brand United Express using Embraer E175 aircraft will depart Houston in the evening and return early the next morning as an overnight flight.

Source: Routes Online

Allegiant Air is launching new summer seasonal service between Memphis, Tennessee and West Palm Beach, Florida beginning on June 25. Operated on Allegiant's Airbus A320 aircraft, the service will operate twice-weekly on Sundays and Thursday until October 11 as the airline grows its base in Memphis.

Source: Allegiant Air

Frontier Airlines is launching new transcontinental service between Miami and Ontario, California on April 23 as the airline grows its presence at the Southern California airport. Daily service will be flown using Frontier's Airbus A320 aircraft and is scheduled to operate until November 9.

Source: Frontier Airlines

Southwest Airlines is giving Nashville, Tennessee its first non-stop link to the Caribbean with new seasonal service to San Juan beginning June 10. The once-weekly service will operate solely on Saturdays with Southwest's Boeing 737 family aircraft until August 8.

Source: Nashville International Airport

United Airlines through its United Express regional brand is launching service between Washington and Hilton Head Island, South Carolina on March 29. The year-round service will operate once-daily from Dulles International Airport on Embraer E175 aircraft.

Source: Routes Online

Minneapolis-based Sun Country Airlines is launching new seasonal service between Madison, Wisconsin and Seattle on May 8 as the low-cost airline builds a base in the Wisconsin capital and college town. The twice-weekly service is scheduled to operate on Mondays and Fridays until October 26 using Sun Country's Boeing 737 aircraft.

Source: Madison Dane County Airport

American Airlines is launching seasonal service between Philadelphia and Bozeman, Montana for the summer beginning on June 6. The once-weekly service will operate on Saturdays only using Boeing 737-800 aircraft until September 5 and complement the airline's service from New York launching the same day.

Source: American Airlines

American Airlines is launching seasonal service through its American Eagle regional brand between Philadelphia and Nantucket, Massachusetts as the airline expands its summer presence in the Massachusetts islands with service to Martha's Vineyard launching the same day. Operating from June 20 to September 5, the service will operate once weekly on Saturdays using Embraer E175 aircraft.

Source: American Airlines

Silver Airways is launching one of its longest routes between Orlando and Charleston, South Carolina as the airline inches up the East Coast. The year-round route begins on May 21 with once-daily service onboard the airline's new ATR 72-600 turboprop aircraft.

Source: Silver Airways

Alaska Airlines is launching a new year-round route between Seattle and Monterey, California under its regional brand operated by Horizon Air. The service begins on June 18 with once-daily service operated by the airline's Embraer E175 aircraft.

Source: Alaska Airlines

Allegiant Air is expanding its Las Vegas network with a summer seasonal route to Fort Wayne, Indiana beginning June 3. The twice-weekly service will be operated by Allegiant's Airbus A320 aircraft until August 17 with one flight per day.

Source: Allegiant Air

Sun Country Airlines is adding Portland, Maine to its route network from Minneapolis on June 18 with seasonal service until October 22. The route will connect Portland with West Coast cities through Minneapolis as the airline focuses on one-stop transcontinental flights during the summer.

Source: Sun Country Airlines