FlexTrip Alerts

Flight price alerts: London → Lisbon

Sample round trips on this route start around EUR 77; September 2026 is often the cheapest month in our next-3-month window. FlexTrip Alerts is a free email service — set flexible travel dates and a max price, and we notify you when a round trip fits. We check fares about four times per day; we do not sell tickets.

Set a free tracker with flexible dates and your max price. We email you only when a round trip fits.

Sample fares from EUR 77. Cheapest month in our next-3-month sample: September 2026.

Set an alert and we email you when a round trip drops under your limit.

Set a price alert

Round trips on this route

Cheapest-seen sample fares (next 3 months) — confirm the final price on the booking site when you click through.

Last updated .

  • Round trip · 7 nights
    Tue 15 Sept · 06:20
    Return Tue 22 Sept · 21:40

    EUR 77

    See deal
  • Round trip · 3 nights
    Sat 19 Sept · 20:35
    Return Tue 22 Sept · 20:35

    EUR 82

    See deal
  • Round trip · 8 nights
    Wed 14 Oct · 17:05
    Return Thu 22 Oct · 05:55

    EUR 94

    See deal
  • Round trip · 3 nights
    Fri 02 Oct · 18:25
    Return Mon 05 Oct · 22:45

    EUR 106

    See deal
  • Round trip · 6 nights
    Wed 09 Sept · 19:15
    Return Tue 15 Sept · 22:00

    EUR 113

    See deal
  • Round trip · 5 nights
    Fri 18 Sept · 18:25
    Return Wed 23 Sept · 20:20

    EUR 121

    See deal
  • Round trip · 2 nights
    Tue 01 Sept · 18:20
    Return Thu 03 Sept · 21:15

    EUR 130

    See deal
  • Round trip · 3 nights
    Tue 01 Sept · 18:20
    Return Fri 04 Sept · 22:30

    EUR 137

    See deal
  • Round trip · 7 nights
    Fri 11 Sept · 18:25
    Return Fri 18 Sept · 21:40

    EUR 137

    See deal
  • Round trip · 2 nights
    Fri 23 Oct · 15:45
    Return Sun 25 Oct · 09:55

    EUR 137

    See deal
  • Round trip · 21 nights
    Sun 06 Sept · 06:45
    Return Sun 27 Sept · 05:55

    EUR 140

    See deal
  • Round trip · 10 nights
    Fri 18 Sept · 18:25
    Return Mon 28 Sept · 23:00

    EUR 141

    See deal
  • Round trip · 2 nights
    Sat 05 Sept · 18:30
    Return Mon 07 Sept · 22:00

    EUR 145

    See deal
  • Round trip · 3 nights
    Mon 31 Aug · 12:50
    Return Thu 03 Sept · 15:00

    EUR 147

    See deal
  • Round trip · 4 nights
    Tue 01 Sept · 18:20
    Return Sat 05 Sept · 08:20

    EUR 147

    See deal

Frequently asked questions

How do I get email alerts when London to Lisbon flights drop in price?
Create a free FlexTrip Alerts tracker for London (All Airports) (LON) to Lisbon Humberto Delgado Airport (LIS). Choose your flexible departure window, stay length, and maximum price — we email you when a round trip fits.
Does FlexTrip Alerts book flights from London to Lisbon?
No — we do not sell tickets. FlexTrip Alerts watches prices and emails you when a fare matches your plan. You book on the airline or travel site you prefer when you receive an alert.
Can I set flexible travel dates for London to Lisbon alerts?
Yes. Pick a departure window (not one fixed day) and how many nights you can stay. We match round trips that fit your window, stay length, and max price — then email you when one qualifies.
How often does FlexTrip Alerts check London to Lisbon fares?
We scan aggregated fares on a schedule — about four times per day (every ~6 hours, UTC). You can also trigger an on-demand check from your dashboard, with a short cooldown between manual refreshes.
What is the cheapest month to fly from London to Lisbon?
Based on recent fare samples on this page, September 2026 is currently the cheapest month to fly from London to Lisbon, with round trips from about EUR 77. Prices change — set an alert to catch the next drop.

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See all 5 departure cities with price alerts into Lisbon Humberto Delgado Airport (LIS).

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