The difference nobody explains clearly

Campaigns are emails you schedule and send to a list. A Black Friday campaign, a new product launch, a weekly newsletter. You write it, you send it, it either works or it doesn't.

Flows are automated sequences triggered by specific customer behaviours. Someone abandons their cart: they get an email. Someone hasn't bought in 90 days: they get a win-back sequence. Someone views a product five times without buying: they get a browse abandonment email.

The distinction matters because the economics of flows and campaigns are completely different.

Why flows generate more revenue per send

Klaviyo data across the platform shows that flows generate 18 times more revenue per send than campaigns. That number is striking, but the reason makes intuitive sense once you think about it.

A campaign goes to everyone on your list simultaneously. Relevance is limited by what you know about a segment. A flow triggers because of a specific action by a specific person at a specific moment. The email about the product someone was looking at five minutes ago is always going to outperform the weekly newsletter.

Context is relevance. Relevance drives conversion. Flows have both, by design.

What 40% email revenue from flows looks like

The industry benchmark for well-optimised email programmes is flows generating 35 to 45% of total email-attributed revenue, from just 5% of total sends.

Most Shopify brands are sitting at 10 to 20%. The gap is almost always in the flow architecture, not the campaigns.

The brands hitting 40%+ typically have these flows live and optimised:

Welcome series: 4 to 6 emails over 14 days, segmented by acquisition source. Converts subscribers before they forget why they signed up.

Abandoned checkout: 3 to 4 emails over 24 hours. The first sends within 30 minutes. Most brands send one email and call it done.

Browse abandonment: Triggers after product views without a cart add. Highly targeted, consistently underutilised.

Post-purchase: Starts at delivery confirmation, moves into cross-sell and loyalty. Builds LTV without touching your ad budget.

Win-back: 90-day lapsed buyers. Most brands ignore this segment entirely.

The campaign mistake that kills flow performance

Here's something that doesn't get discussed: aggressive campaign sending actively reduces flow revenue.

When you send campaigns to your full list four times a week, you're training your subscribers to ignore your emails. Open rates fall. Deliverability degrades. And when your flow triggers — the abandoned checkout email, the win-back — it lands in a depleted inbox.

The brands generating 40%+ from flows are typically sending fewer campaigns, not more. They're protecting their audience's attention so that when the flows fire, they land.

What most brands are missing

If you're generating under 25% of email revenue from flows, the issue is almost certainly one of three things: flows aren't set up, flows aren't segmented, or flows are set up but never optimised after launch.

The fix isn't complicated. It's systematic. Map your customer journey, identify every moment where a triggered email would be relevant, build the sequence, and test.

If you want to understand what that looks like in practice, see how we approach email for DTC brands.

Want to go deeper? Read our Mastering Klaviyo playbook for the full strategy.