What changes

Price alerts are often associated with 5–15% lower fares versus buying at first search for flexible-date travelers.

When this tends to work

• Conditions similar to: Leisure routes tracked on Google Flights / Hopper, 2022–2025
• You can measure Fare paid vs initial search price reliably
• The intervention is implemented consistently, not half-measured

When to be careful

• Your audience or product differs materially from the cited context
• Compliance costs or second-order effects outweigh the lift
• Evidence label is estimate—treat wide ranges as planning bands, not promises

Practical takeaway

Use the cited range for prioritization and test design. Verify against your own data before scaling.