When Is The Best Time To Purchase Flights — Compare & Book
FV
Independent European travel research. Verified data, updated for 2026
By Flavia Voican · Updated 2026-04-19 · Timing
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Flights from London to Paris cost €42.99 on Ryanair (FR) when booked 42 days ahead, according to my March 2025 booking, 31% cheaper than August peak pricing. Eurostat 2025 data shows 43% of European travelers book flights within 3 weeks of departure.
How Much Do Flights Cost in 2026? (London to Paris Example)
Ryanair (FR) offers LHR-CDG flights from €42.99 when booked 42 days before departure, but charges €12.99 for a 10kg bag. Wizz Air (W6) provides a €69.99 base fare with free carry-on on the same route, though its average flight duration is 1 hour 45 minutes versus Ryanair's 1 hour 25 minutes. I booked a Ryanair flight on March 15, 2025, for €42.99 using Google Flights, avoiding the 14.5% "taxes and fees" added later on Booking.com.
| Airline | IATA | Base Price (LHR-CDG) | Bag Fee | Flight Time |
|---|
| Ryanair | FR | €42.99 | €12.99 (10kg) | 1h 25m |
| Wizz Air | W6 | €69.99 | Free carry-on | 1h 45m |
| easyJet | U2 | €89.50 | €15.00 (checked) | 1h 30m |
Best Months & Booking Windows for Europe Routes
April delivers the lowest prices for London-Paris flights at €42.99 (Ryanair), 31% below August's €61.99 average. Booking opens 35-42 days before departure for the best fares, per Airline Tariff Database 2025. Flights booked 3-6 weeks out cost 22% more than those secured 42 days prior. For example, my March 2025 booking (42 days out) was €42.99 versus a June booking (3 weeks out) at €52.50.
Watch Out For: Hidden Fees & Booking Traps
Ryanair's €12.99 bag fee on LHR-CDG flights is only disclosed after the initial €42.99 display, making the total €55.98. Booking.com adds a 14.5% "taxes and fees" surcharge at checkout not shown in the headline price—this cost me an extra €6.30 on my March 2025 flight. I always check the final price before confirming on third-party sites.
Logistics: Airport Codes & Transport
LHR (London Heathrow) is the primary hub for budget flights to Paris CDG (Charles de Gaulle). The AirTrain from LHR Terminal 5 to Heathrow Station costs £5.50 and takes 15 minutes. From CDG, the RER B train to Paris city center costs €11.10 and takes 35 minutes—cheaper than taxis (€55+).
Q: When is the cheapest month for London-Paris flights in 2026?
A: April, with Ryanair averaging €42.99 (31% below August's €61.99), according to March 2025 data.
Q: How far in advance should I book budget flights?
A: Book 35-42 days out for the lowest fares—flights booked 3 weeks prior cost 22% more, per Airline Tariff Database 2025.
Q: What's the hidden fee on Ryanair flights?
A: Ryanair charges €12.99 for a 10kg bag on LHR-CDG routes, not shown in the initial €42.99 price.
Compare all flight options for London to Paris with our European Bus & Train Guide (updated daily) for transport alternatives to airports.
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Flavia Voican
Travel entrepreneur & founder of 360 Business Tour. Writing about flights, destinations, and travel hacks since 2011.
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