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Cheapest month to fly

London (LHR) → Lisbon

✓ September 2026 · from €75

Cheapest month

September 2026 €75

How do you calculate the cheapest month?

We aggregate verified partner fares (Travelpayouts/Aviasales) by date and show the month with the lowest observed price.

Is the price guaranteed?

No — fares change. Use live search and alerts to confirm before booking.

Can I change the route?

Yes — pick from/to in the form, or open Cheap Month from any route page.