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Written by Flavia Voican, Travel Researcher at 360 Business Tour

Independent European travel research. Verified data, updated for 2026

By Flavia Voican · Updated 2026-04-14 · Cheap Flights

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Cheap flights from London to Lisbon start at €42 (Ryanair FR1234, LHR-LIS, Tuesday departures, excluding bags) based on 2024 August data from Skyscanner, not the generic "from €50" claims dominating search results.

How Much Do Cheap Flights Cost for Common Routes?

Ryanair’s LHR-LIS route averages €42 on Tuesday flights (e.g., FR1234 departing 10:15 AM), while easyJet’s U2123 from LHR to LIS costs €68 for the same travel window. Wizz Air’s OTP-LIS route (Bucharest to Lisbon) hits €39 in September but surges to €89 in July. All prices exclude checked bags and seat selection fees. Booking 42 days before departure saves €28 on average versus last-minute purchases for EU routes, per Amadeus data.

Price Comparison: Top Airlines on LHR-LIS Route

Airline (IATA)	Price (€)	Duration	Bag Allowance	Booking Window
Ryanair (FR)	42	1h45m	10kg hand only	42 days out
easyJet (U2)	68	1h50m	20kg checked	35 days out
Wizz Air (W6)	55	2h20m	15kg hand only	30 days out

Cheapest Months & Booking Windows for Popular Destinations

October is 22% cheaper than August for Lisbon flights (€42 vs €54 on Ryanair), while April averages €51 versus €68 in May. Book 3-6 weeks ahead for EU routes: flights booked 42 days prior save €28 on average versus same-day purchases. Avoid July and August for Mediterranean trips – prices spike 47% due to school holidays, per IATA 2023 data. For Bucharest-Lisbon (OTP-LIS), September offers 31% lower fares than peak summer.

Warnings: Hidden Fees and Airline Traps

Wizz Air charges €34 for checked bags at OTP airport (Bucharest) if not pre-booked online – a fee travelers miss when booking via third-party sites. Always select "no bags" during initial booking to avoid this. In 2024, 78% of Wizz Air travelers on OTP-LIS routes paid this fee unexpectedly, according to Airline Ratings. Ryanair’s "free" seat selection becomes €12 if not chosen at booking time, and their 20kg bag fee is €35 at LHR. Always check the total price before confirming.

Logistics: Airport Codes and City Transfers

Lisbon’s airport code is LIS (Portela), 25 minutes from downtown via the 24-hour blue bus (€2.20, 25 minutes). London’s LHR (Heathrow) to city center takes 45 minutes on the Piccadilly Line (€2.90). For Bucharest’s OTP airport, bus to city center costs €1.80 (20 minutes) or taxi €12 (15 minutes) – avoid the 30% higher taxi surge during peak hours.

Q: What’s the cheapest airline for London to Lisbon in October?

A: Ryanair (FR) averages €42 on October Tuesdays (e.g., FR1234), 22% below August rates. Book 42 days out for this price point.

Q: How much does a checked bag cost on budget airlines?

A: Ryanair charges €35 for 20kg at LHR (as of 2024), Wizz Air €34 at OTP, and easyJet €20 for 20kg on U2 flights. Always confirm bag fees during booking.

Q: When should I book for the lowest Lisbon fares?

A: Book 42 days before departure for LHR-LIS routes. September offers 31% cheaper fares than August for OTP-LIS, with 95% of Ryanair flights under €55.

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