The Summer I Turned Pretty Season 3 Final Trailer teases Conrad's letter changing everything for Belly

The Summer I Turned Pretty Season 3 drops a final trailer that centers on one choice and one object: Belly in Paris, and a letter from Conrad. The Summer I Turned Pretty Season 3 shows the wedding with Jeremiah called off and a move that resets her life in a new city. The cut follows Belly’s voiceover about loss and finding steady ground again before the mailbox flips the story. The letter reframes the endgame and sets up how the last stretch may resolve.

Prime Video confirms the run-in to the end: the last three episodes arrive weekly from September 3, with the series finale on September 17. The Summer I Turned Pretty Season 3 also threads the book and screen together as Jenny Han guides the close. The trailer suggests a narrow path forward rather than a new triangle, and places the decision after Paris does its work. For viewers, The Summer I Turned Pretty Season 3 is now about what Belly does with Conrad’s words and how she writes back, before summer ends.

The final trailer makes the letter the turning point. The Summer I Turned Pretty Season 3 shows Belly settling in Paris after calling off the wedding. The trailer places the letter at the end, and then cuts to Conrad’s voiceover as the screen holds on to Belly reading. The language of the cut suggests a reset, not a rewind.

The Summer I Turned Pretty Season 3 signals that Belly’s choice comes after distance, and after she reads what Conrad could not say face-to-face. As a device, a handwritten letter shifts the tone from confrontation to reflection, which suits a final decision. In plain terms, the trailer sets up an ending where Belly answers the letter and closes the triangle on her terms. That is the “change everything” promised in the headline, and it is how the show frames the last move.

Belly says in the trailer,

“I had these pillars in my life -- Cousins, my family, Taylor, Jere,”

and later,

“They made me feel like I was safe, like I was on solid ground. Now they're gone. And it's just me.”

Belly also remarked,

“I don't even know who I am anymore. I need to find the person that I can be."

Context from this season matters. The letter lands after the called-off wedding and after Belly chooses a semester abroad. That timing is why the triangle’s power shifts once Paris creates space. The Summer I Turned Pretty Season 3 uses the letter to stage a quiet final act rather than another public confrontation. For readers tracking book parallels, a written confession or closure differs from the novel’s mechanics, but it serves the same end: forcing the last, clear choice.

Belly’s Paris reset: new faces, self-discovery, and book parallels

The Paris arc works as a clean slate. The trailer shows Belly walking the city alone and speaking in a reflective voiceover. New recurring players include Corinna Brown, Fernando Cattori, Isaline Prévost Radeff, and Jahz Armando, who fold into her day-to-day life abroad. The Summer I Turned Pretty Season 3 uses that circle to move the story past Cousins and toward a decision made away from both brothers.

As per Entertainment Weekly's report dated August 29, 2025, author Jenny Han stated,

“There are surprises....And there are things that aren't exactly like the books.”

That frames how the show nods to We’ll Always Have Summer while changing the route to the last scene. She also said,

“A successful love triangle is one where, no matter what happens, people are going to be devastated and heartbroken,”

Which fits a finale built around consequence. The Summer I Turned Pretty Season 3 keeps Paris as growth, not escape. Trailer shots and casting notes mark this as a self-check arc before Belly answers Conrad’s letter.

Release plan and where to watch: dates, times, and the finale runway

The rollout is locked: the final three episodes premiere on September 3 and September 10, with the series finale on September 17. New episodes drop Wednesdays at 12 a.m. PT / 3 a.m. ET on Prime Video. Stream The Summer I Turned Pretty Season 3 on Prime Video. The show page lists all seasons. This final trailer promises closure via letters and a Paris arc that resolves the triangle on the page and on screen.

Stay tuned for more updates.