US consumer prices rose moderately in January as an increase in the cost of gasoline was blunted by a slump in airline fares, suggesting inflation could remain benign for a while amid a pandemic that has fractured the labor market and services industry.

The Labor Department said on Wednesday its consumer price index increased 0.3% last month after a downwardly revised 0.2% gain in December.

In the 12 months through January the CPI rose 1.4% after advancing by a revised 1.3% in December.

The CPI was previously reported to have increased 0.4% in December and 1.4% on a year-on-year basis.

Last month's rise in the CPI was in line with economists’ expectations.

Inflation is being closely watched this year, with economic growth expected to be juiced by fiscal stimulus and coronavirus vaccines becoming accessible to large swaths of the population, unleashing pent-up demand for services.

Higher inflation is anticipated by the spring as price declines early in the coronavirus crisis wash out of the calculations.

Economists are, however, divided on whether faster inflation would stick beyond the so-called base effects.

Some believe trillions in pandemic relief provided by the US government will stoke price pressures.

Others argue that labor market slack, characterized by at least 17.8 million on unemployment benefits, would make it harder for inflation to become entrenched.

The Federal Reserve has signaled it would tolerate higher prices after inflation persistently undershot the US central bank's 2% target, a flexible average.

The Fed has slashed interest rates to near zero and is pumping money into the economy through asset purchases.

It is expected to maintain its ultra-easy monetary policy stance until mid-2023.

"Inflation is poised to rise above 2% in the spring, but this will be driven largely by easy base effects and should be transitory," said Kathy Bostjancic, chief U.S. financial economist at Oxford Economics in New York.

"Thus, the Federal Reserve should patiently look past this increase and delay rate liftoff until mid-2023."