NEW YORK — Cy ya later.

R.A. Dickey and his nasty knuckleball are headed north of the border.

After weeks of speculation and then a weekend spent ironing out the last few details, the New York Mets finally traded the NL Cy Young Award winner to the Toronto Blue Jays in a seven-player swap Monday.

Toronto acquired the 38-year-old Dickey and catchers Josh Thole and Mike Nickeas. The Mets got top catching prospect Travis d’Arnaud and veteran catcher John Buck, plus minor league right-hander Noah Syndergaard and outfielder Wuilmer Becerra.

Earlier in the day, Dickey and the busy Blue Jays agreed to a new contract, clearing the way for New York to send him to a team that’s spending a lot of money trying to join baseball’s elite.

General manager Sandy Alderson said the Mets didn’t completely decide to trade Dickey until they saw the final package that Toronto offered.

“This was a complicated deal,” Alderson said on a conference call.

Dickey broke the news even before the teams did.

A few minutes ahead of the trade announcement, he tweeted his thanks to Mets fans and added he was all set to pitch for the Blue Jays.

“Now that it’s official, I want to say that I don’t have the words to express how grateful I am to you for the steadfast support,” Dickey posted on Twitter. “Thank you for making me feel wanted.”

“Looking forward to a new chapter with the Jays,” he wrote.