Klaviyo SMS Flows: 9 High-Converting Automations to Boost Retention (2025)

SMS Marketing · Klaviyo Flows

Klaviyo SMS Flows: 9 High-Converting Automations to Boost Retention

Q: Can I send both email and SMS in the same Klaviyo flow?

Yes. Klaviyo lets you mix channels within a single flow. Use SMS for urgency (flash sales, cart reminders) and email for visuals, storytelling, and longer-form content like product bundles.

Q: How do I stay compliant when sending Klaviyo SMS flows?

Always collect explicit opt-in before sending. Include opt-out language in every message (Reply STOP to unsubscribe). Enable Quiet Hours to avoid late-night sends. Use Klaviyo's consent filter Has consented to receive SMS in all flow filters.

11 min read By Sendora Team Jul 30, 2025

SMS isn’t just another channel — it’s your brand’s fastest route to attention. With 90% of texts read within 3 minutes and consumers subscribing to only 2–3 SMS lists, every message you send is competing for a rare slot in their attention. Klaviyo SMS flows give you the edge — automating timely, personalised texts that reach customers exactly when they’re ready to act.

What This Guide Covers

What Klaviyo SMS flows are and how they differ from email automations
Consent and compliance — TCPA, GDPR, CASL requirements and Klaviyo setup
9 proven SMS flow automations with triggers, content, and why they work
How to personalise SMS flows with profile and behavioural data
Advanced conditional logic, Smart Sending, and multichannel flow setup
SMS vs email — when to use each channel in your automation strategy

90%

of SMS messages read within 3 minutes of delivery

98%

SMS open rate — vs ~20% average for email

2–3

SMS lists the average consumer subscribes to — make the cut count

What Are Klaviyo SMS Flows?

Klaviyo SMS flows are automated text message sequences triggered by customer actions, profile updates, or custom events — built inside Klaviyo’s Flow Builder. They allow brands to send timely, personalised SMS at every stage of the customer journey, from first sign-up to win-back, without manual intervention.

Three Types of Klaviyo SMS Flows

💬 Standalone SMS Flows

Automations delivered entirely via text — shipping updates, order confirmations, price drop alerts. Fast and direct.

📧 Multichannel Flows

SMS complements email in the same flow — e.g. an abandoned cart email followed 1 hour later by an SMS reminder for opted-in users.

🔀 Smart Conditional Flows

Uses logic like “Has consented to receive SMS” to branch opted-in users into SMS paths and non-opted-in users into email paths.

🎯 Event-Triggered Flows

Fired by real-time events — product viewed, quiz completed, loyalty tier changed. Hyper-relevant messages at the moment of intent.

Multichannel Branching Add a conditional split to your flows: “Has consented to receive SMS = true” → SMS path; “false” → email path. This keeps you compliant, blends channels intelligently, and ensures no opted-in subscriber slips through.

Consent & Compliance — SMS Setup That Builds Trust

Before sending any Klaviyo SMS flow, collecting explicit, documented consent is legally required. Regulations differ by region — here’s what you need to know:

🇺🇸 TCPA (US)

Opt-in must be explicit. No pre-checked boxes. Prior express written consent required for marketing SMS. Violations carry per-message fines.

🇨🇦 CASL (Canada)

Consent must be prior and verifiable. Express consent required unless there’s an existing business relationship. Implied consent has a time limit.

🇪🇺 GDPR (EU)

Active consent required with clear data-use disclosure. Cannot bundle SMS consent with other terms. Consider double opt-in for international lists.

How to Collect SMS Opt-In in Klaviyo

Klaviyo sign-up forms (popups, flyouts, embedded) with compliant consent language
Checkout opt-in checkboxes integrated with Shopify, BigCommerce, and WooCommerce
Keyword reply campaigns — “Text JOIN to 12345” — verified and logged automatically

Klaviyo automatically stores opt-in metadata (timestamp, source, and method) on every profile — essential for compliance audits. Always include Reply STOP to unsubscribe and Message and data rates may apply in every SMS message Klaviyo handles this by default.

Klaviyo SMS opt-in form — compliant consent language and opt-out instructions are required on every collection point Klaviyo SMS Consent Setup →

Enable Smart Sending & Quiet Hours

Smart Sending: Prevents texts to recipients messaged within a customisable window — avoids message fatigue and reduces opt-outs
Quiet Hours: Suppresses sends during defined time windows (e.g. 9 PM–10 AM local time). Applies to both flows and campaigns

Klaviyo Smart Sending settings panel showing toggles to skip recently messaged profiles from campaigns and flows with configurable time window settings

Klaviyo Smart Sending — automatically skip recently messaged profiles to reduce fatigue and protect opt-out rates Klaviyo Smart Sending Setup →

9 Klaviyo SMS Flows Every DTC Brand Should Build

Welcome Series

Trigger: SMS opt-in via popup, embedded form, or checkout

A warm greeting that immediately reflects your brand’s tone
The discount code or offer promised during sign-up — deliver it instantly
A brief note on what to expect from future messages

Why it works — SMS has a 98% open rate, so your first message is almost guaranteed to be seen. A strong welcome converts new subscribers into first-time buyers faster than any other flow in your sequence.

Abandoned Cart

Trigger: Added to Cart → no purchase after 1–4 hours

Direct reminder with a one-click cart link
Scarcity language where genuine — “Selling fast” or “Low stock”
Optional light incentive — “Use code SAVE10 at checkout”

Why it works — One of the highest-ROI flows in Klaviyo. SMS cuts through faster than email for cart recovery — 90% read rate within 3 minutes means your message arrives while the customer still has intent.

Shipping Updates

Trigger: Order placed → shipped → delivered

Order confirmation message with order number
Dispatch notification with tracking link
Delivery confirmation that opens the door to a post-purchase sequence

Why it works — Reduces “Where is my order?” support tickets and builds post-purchase trust. Klaviyo integrates directly with Shopify for real-time shipping data that triggers each message automatically.

Post-Purchase Flow

Trigger: Order fulfilled

Thank-you message that reinforces the purchase decision
Add-on product suggestion or bundle recommendation
Review request or product care tips — sent 3–5 days after delivery

Why it works — Turns one-time buyers into repeat customers. Use SMS first for immediacy, then follow with email carrying richer product detail, imagery, and social proof to close the next sale.

Win-Back

Trigger: Last purchase was 60+ or 90+ days ago

Exclusive “we miss you” offer — personalised where possible
Quick-buy link to a product they previously viewed or purchased

Why it works — Retains drifting customers and protects LTV. Use segment filters to exclude recently active buyers. The SMS channel adds urgency that email win-back campaigns often can’t match.

VIP Flow

Trigger: Customer enters VIP segment by LTV or order count

Early access to new product drops before the general list
Private sale invites or loyalty reward notifications

Why it works — Rewards your highest-value customers, deepens brand affinity, and increases repeat purchase rate. Use Klaviyo predictive analytics or Shopify tags to build dynamic, self-updating VIP segments.

Back-in-Stock Alert

Trigger: Item restocked + profile viewed or waitlisted the product

Product-specific alert with urgency — use product name, not just “item”
Direct link to the product page or add-to-cart shortcut

Why it works — Converts high-intent shoppers who already showed interest. These are warm leads with specific purchase intent — a personalised SMS alert drives fast conversion before competitors can.

Price Drop Alert

Trigger: Product in wishlist or previously viewed drops in price

Announcement with specific product name and the new price
“Shop now” link direct to the PDP or add-to-cart URL

Why it works — Shoppers who viewed but didn’t buy are often price-sensitive. SMS lets you reach them while the offer is hot — before competitors do. Use Klaviyo’s native Price Drop trigger with Shopify or WooCommerce integration.

Abandoned Checkout

Trigger: Checkout started → no purchase after 1 hour

Direct reminder with the saved checkout link
Optional urgency — “Only 3 left at this price”
Incentive or free shipping threshold if needed to close the conversion

Why it works — Abandoned checkout customers are the highest-intent segment in your list. They reached the payment screen. SMS recovers these customers faster than email — 90% read rate in 3 minutes puts your message in front of them before they close the tab.

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Personalise Klaviyo SMS Flows with Smart Data

Personalisation turns SMS from a broadcast into a conversation. Klaviyo lets you use real-time profile and behavioural data to send messages that feel timely and genuinely relevant to each individual recipient.

Profile Properties

Insert dynamic fields like {{ first_name|default:'there' }}, birthday, location, or VIP tier into messages. Always set a fallback to avoid blank fields in sends.

Behavioural Triggers

Fire messages from specific actions — viewed product, added to cart, completed a quiz, clicked an email link. The more specific the trigger, the higher the relevance.

Lifecycle Segmentation

Segment by new vs repeat, VIP vs low LTV, engaged vs at-risk — then tailor messaging. New subscribers get education; VIPs get exclusive early access.

Zero-Party Data

Use quiz responses (Octane AI, Typeform) or preference centre answers to personalise SMS content. “Completed Skincare Quiz → result = oily” triggers a targeted product SMS.

Advanced Flow Logic to Supercharge Klaviyo SMS ROI

Once your core flows are live, adding conditional logic, smart delays, and cross-channel coordination helps scale personalisation, reduce message fatigue, and meaningfully lift revenue per recipient.

🔀

Conditional Splits for Relevant Segmentation

Split by location, loyalty tier, or LTV to show different products and copy to each group. First-time buyers get education; high-LTV customers get premium bundles. Relevant messages reduce opt-outs and lift conversion rates.

⏱️

Smart Delays to Avoid Overlap

Add delays if a customer recently received an email or SMS. Wait a few days after delivery confirmation before sending an upsell. Use “Wait until X days after event” to space messages naturally — and turn on Smart Sending as a safety net.

📊

Real-Time Behavioural Triggers

Viewed a product? Trigger back-in-stock or price drop alerts the moment stock or price changes. Completed a quiz? Send tailored SMS using the result as a profile property. These intent signals make every message feel like the right one at the right moment.

📧

Combine SMS and Email for Cross-Channel Impact

Use SMS for time-sensitive urgency (flash sales, back-in-stock) and email for visuals, storytelling, and bundles. Add logic like “Has clicked email in last 7 days = false” before sending an SMS reminder to avoid duplicate pressure on engaged email openers.

SMS vs Email — When to Use Each Channel

Use Case	Best Channel	Why
Flash sale or limited-time offer	SMS	90% read in 3 minutes — urgency lands before the offer expires
Abandoned cart or checkout	SMS + Email	Email first for context; SMS follow-up for opted-in users who didn’t convert
Back-in-stock alert	SMS	Speed matters — stock may sell out before email is opened
Product launch with visuals	Email	Rich imagery and storytelling need more space than 160 characters
Shipping or order updates	SMS	Immediate updates reduce support tickets and build trust post-purchase
Loyalty tier upgrades	SMS + Email	SMS for the instant celebration; email for full rewards detail and redemption
Win-back campaign	Email → SMS	Start with email; escalate to SMS if no engagement after 7–10 days
Educational content or blog roundup	Email	Long-form content, links, and visuals require email depth — SMS would truncate and confuse

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Frequently Asked Questions About Klaviyo SMS Flows

How many Klaviyo SMS flows should I start with? +

Start with 3–4 core flows: Welcome, Abandoned Cart, Post-Purchase, and Win-Back. These cover the highest-ROI lifecycle moments. Expand to VIP and Back-in-Stock as your SMS list grows and you have enough consent-based data to power them.

Can I send both email and SMS in the same Klaviyo flow? +

Yes. Klaviyo lets you mix channels within a single flow. Add SMS blocks alongside email blocks, then use conditional splits to route opted-in users to SMS and everyone else to email. Use SMS for urgency and email for richer product detail and visuals.

How do I stay compliant when sending Klaviyo SMS flows? +

Always collect explicit opt-in before sending — no pre-checked boxes. Include “Reply STOP to unsubscribe” in every message. Enable Quiet Hours to avoid late-night sends. Add “Has consented to receive SMS” as a filter on every SMS flow to prevent messaging non-consented profiles.

What is a good SMS conversion rate in Klaviyo? +

Strong benchmarks for abandoned cart or price drop SMS are a 10–15% click-through rate and 5–8% conversion rate. These vary by flow type, audience quality, offer relevance, and how well you’ve timed the send relative to the triggering event.

How do I test if my Klaviyo SMS flow is working? +

Use Klaviyo’s preview and test message features during setup. Once live, monitor click-through rate, conversion rate, and opt-out rate in flow analytics. A/B test timing, CTA wording, and incentives using the Random Sample split block — change only one variable per test.

Key Takeaways

SMS drives fast results: 90% of messages are read within 3 minutes — make every send time-sensitive, relevant, and worth opening.
Start with high-impact flows: Welcome, Abandoned Cart, Post-Purchase, and Win-Back form the revenue foundation. Build from there.
Compliance is non-negotiable: Explicit opt-in, STOP instructions, and Quiet Hours are legal requirements — not optional. Klaviyo handles the mechanics when configured correctly.
Use SMS and email together: Blend SMS urgency with email depth for better conversion across every lifecycle stage.
Personalised flows lift LTV: Target by behaviour, purchase history, and VIP status. Generic SMS blasts reduce engagement and spike opt-outs.
Advanced logic multiplies impact: Conditional splits, smart delays, and cross-channel coordination can lift per-message revenue 20–40% compared to basic flows.