Cancel your Flash subscription by mail
Flash deals with cancellations through the post, so the request goes in a letter and the certified-mail receipt is your proof of when. The cancellation address on file for Flash is in Lisboa, Portugal.
Let Postbye cancel Flash for you
We write your letter, mail it by certified mail the next business day, and confirm when the cancellation went through. You keep the signed proof.
Money-back guarantee within 10 business days.
Postbye is not affiliated with Flash.
- 4.8 from 2,931 reviews
- 2 Flash cancellations handled this month
- Certified mail with tracking
- Mailed every business day
- Delivery proof sent to you
- We confirm your cancellation
How to cancel Flash by mail
Gather your account details
Put the name and email on the account and, if you have one, an account or customer number in front of you before you write: the request to Flash is only as good as the details it quotes.
Draft the request
Because Flash is dealt with in Portuguese, the letter is written in Portuguese (template pt). Subject: “Assunto: Solicitação de Cancelamento – [your name]”. It requests an end to the subscription and to every further charge, plus written confirmation.
Mail it with tracking
Take the letter to the post office and ask for certified delivery to 1549-023 Lisboa. Keep the tracking number it gives you.
Keep the delivery receipt
It shows the date Flash received your letter. Check your next statement: no Flash charge should post after the cancellation date.
With Postbye, steps 2 to 4 take about two minutes of your time.
Where your Flash cancellation letter goes
For a letter to Flash, use Rua Luciana Stegagno Picchio 3, 1549-023 Lisboa, Portugal.
The envelope is going to Lisboa, Portugal, so the postcode 1549-023 must be on the front.
The letter is addressed “A quem possa interessar,” and its details block uses the labels Titular da conta, Endereço de cobrança registrado and E-mail registrado.
Prefer to write it yourself? Use our letter template
Before you cancel Flash, check these
- Check your next statement: no charge should appear after the cancellation date.
- Look for annual or multi-month plans. A plan paid in advance usually runs to the end of the period you paid for.
- Write well before the next billing date. A request that arrives after it can leave one more charge on your statement.
Several states set rules for subscriptions that renew on their own. See what yours requires in automatic renewal laws by state.
Let Postbye cancel Flash for you
We write your letter, mail it by certified mail the next business day, and confirm when the cancellation went through. You keep the signed proof.
How cancelling by mail works
A subscription ends when the company records your request, not when you stop using it, and a letter is the record you can show later.
A phone call leaves nothing behind; a letter leaves a copy, a date and a delivery receipt.
Flash cancellation at a glance
- How Flash accepts cancellations
- By mailed letter
- Mailing address on file
- Flash Rua Luciana Stegagno Picchio 3 1549-023 Lisboa Portugal
- Country
- Portugal
- Letter language
- Portuguese (template pt)
- Added to the database
- May 26, 2026
- Data last checked
