How to Build a High-Converting Welcome Series in Klaviyo

Your welcome series is the single highest-ROI email automation you can build. New subscribers are at peak interest. Open rates on welcome emails average 45–60%, compared to 18–25% on regular campaigns. If you’re not capitalizing on this window, you’re losing your best chance to convert a browser into a buyer.

Here’s how to build a welcome flow in Klaviyo that actually converts, with exact settings, subject line templates, and performance benchmarks.

Klaviyo Flow Settings

• Trigger: List — Added to your main email list (e.g., Newsletter or Popup Subscribers)
• Filter: Has not Placed Order since starting this flow (prevents sending discount to people who already bought)
• Flow timing: Email 1 immediately, Email 2 at 24 hours, Email 3 at 72 hours, Email 4 at 120 hours, Email 5 at 168 hours
• Smart Sending: ON (prevents over-sending)

The 5-Email Welcome Sequence

Email 1 — Deliver the Incentive (Immediate)

This email has one job: deliver the discount code and get them to shop. Keep it short. Hero image, discount code in a big styled box, one clear CTA button. No brand story yet — save that for Email 2.

Email 2 — Tell Your Brand Story (Day 1–2)

Now that they have the discount, introduce yourself. Why does your brand exist? Who do you serve? What makes you different? This is the email that builds an emotional connection. Use founder photos or behind-the-scenes imagery.

Email 3 — Social Proof (Day 3–4)

Show that other people love your products. Include 2–3 customer reviews with photos, any press mentions, and user-generated content from Instagram. People trust other customers more than they trust brands.

Email 4 — Product Education (Day 5–6)

Help them shop. Feature your best sellers, create a simple buying guide, or show how to choose between products. Remove friction from the decision-making process.

Email 5 — Urgency (Day 7)

Their discount is about to expire. This email is a reminder with a clear deadline. Use countdown language and a direct CTA. This email often drives the most conversions in the entire series.

10 Subject Line Templates

1. Welcome to [Brand] — here’s your [X]% off
2. You’re in! Here’s what to expect
3. This is why 10,000+ customers trust [Brand]
4. The story behind [Brand] (and a gift for you)
5. Our best sellers are waiting for you
6. Real customers, real results — see what they say
7. Not sure where to start? We picked for you
8. Your [X]% off expires tomorrow
9. Last chance — your welcome gift disappears tonight
10. [First Name], your exclusive welcome offer is inside

A/B Testing Ideas

• Discount amount: Test 10% vs 15% vs free shipping. Measure conversion rate, not just opens.
• Send timing: Test sending Email 1 immediately vs a 15-minute delay. Some brands see higher engagement with a short delay.
• Format: Test plain-text vs branded template for Email 1. Plain text often gets higher reply rates.
• Series length: Test 3-email vs 5-email series. Shorter may outperform if your purchase cycle is fast.

Performance Benchmarks

If your welcome flow is performing below these ranges, the most common issues are weak subject lines, too much text in Email 1, or a discount that isn’t compelling enough. Start by testing the subject line on Email 1 — it’s the highest-leverage change you can make.