Good luck finding cheap flights anywhere in the US right now

If you were eagerly awaiting domestic travel in the US this summer, you should be ready to shell out big bucks.

Prices for flights rose 33.3% in the last year, 18.6% in the month of April alone, according to new data from the US Bureau of Labor Statistics (pdf). That’s “the largest one-month increase since the inception of the series in 1963,” and far outpaces the already-high consumer index on all items of 8.3% from the year prior.