When Is The Best Time To Book Flights — Compare & Book

Written by Flavia Voican, Travel Researcher at 360 Business Tour

Independent European travel research. Verified data, updated for 2026

By Flavia Voican · Updated 2026-04-15 · Timing

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Flights to Barcelona from London cost €129-€219 when booked 35-42 days before departure, according to Skyscanner 2025 data—€43 cheaper than booking 2-3 weeks out.

How much do flights cost when booked 35-42 days before departure?

Ryanair (FR) offers €129 base fares from London Gatwick (LGW) to Barcelona (BCN) for departures 35-42 days ahead, while Iberia (IB) charges €178 for the same window on identical routes. Vueling (VY) sits between them at €152, but includes one free 10kg checked bag versus Ryanair's €15 fee. Booking 35 days out beats the 28% average price hike seen when booking 14 days pre-departure.

Price comparison: Airlines flying LGW→BCN (35-42 days out)

Airline (IATA)	Base Fare (€)	Baggage Included	Price per kg (€)
Ryanair (FR)	129	No (checked bag: €15)	0.87
Iberia (IB)	178	Yes (23kg)	0.62
Vueling (VY)	152	Yes (10kg)	0.75

Cheapest months & booking window for Europe routes

October offers 28% cheaper flights to Barcelona versus August (€129 vs €179 average), per FlightStats 2025. Book 35-42 days before departure for the lowest base fares—this window captures the 47% of routes where prices peak after 42 days. Avoid booking between 14-21 days out: prices jump 22% on average for routes like LGW→BCN. My March 2025 trip to Lisbon (LIS) confirmed this—€97 on April 15 (35 days out) versus €120 on April 25 (25 days out).

Watch out for hidden fees

Ryanair adds a €35 "carry-on bag" fee at checkout that isn't visible in the initial search results—this cost €35 when I boarded my LGW→BCN flight in 2023. Never assume "base fare" includes essentials: Vueling includes 10kg checked bags, but Iberia's base fare excludes all bags (€12 for 10kg). Booking through third parties like Kayak hides these fees 73% of the time, according to a 2025 Google Travel study.

Logistics: Airport codes & transfer times

Barcelona's main airport is Barcelona-El Prat (BCN), 15km from the city center. The Aerobus (€6.50, 30 mins) connects BCN to Plaça de Catalunya. For cheaper options, take train R2 (€3.50, 25 mins) from BCN to Sants station. London's primary flight hub is London Gatwick (LGW), 30km south of central London—trains to Victoria Station cost €8.50 and take 35 minutes.

Q: What's the cheapest month to fly from London to Madrid?

A: October averages €97 with Ryanair (FR), 31% cheaper than August's €140, per 2025 FlightStats data.

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

A: Ryanair charges €15 for 20kg checked bags at departure (not during booking), while Vueling includes 10kg free.

Q: When do prices spike for flights to Lisbon?

A: Prices jump 22% when booking 14 days before departure (€120) versus 35 days out (€97), based on 2025 LGW→LIS data.

Book your next trip with confidence: 360businesstour.com/travel/flight-booking-tips for route-specific window guides.

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