The airline will offer a daily flight to Portland International airport, up from four times weekly this year, and a twice-daily service to Detroit’s Wayne County Metropolitan airport.
Delta’s seasonal Portland route is the only nonstop link from the UK.
“Portland is fast becoming one of the hippest US destinations; a vibrant, friendly city that’s compact enough to explore by bike yet has some of America’s best national parks on its doorstep - we’re upping our frequencies in response to customer demand,” said Roberto Ioriatti, Delta’s vice-president transatlantic.
“With Virgin Atlantic, Delta offers UK holidaymakers nonstop and one stop access to over 200 cities across the US, and we’re delighted to offer more choice to Portland and Detroit next summer.”
Delta has scheduled 210-seat Boeing 767-300ER aircraft on its Portland and Detroit flights, featuring 35 fully flat-bed seats in the Delta One cabin, 32 seats in Delta Comfort+ and 143 seats in the main cabin.