One Way Flights Cheap — Compare & Book
By Flavia Voican · Updated 2026-04-15 · Cheap Flights
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One-way flights from London to Paris cost as little as €50 on Ryanair when booked 42 days ahead, according to March 2026 booking data—37% cheaper than average last-minute fares.
How Much Do Cheap One-Way Flights Cost in 2026?
Ryanair’s base fare from London Heathrow (LHR) to Paris Charles de Gaulle (CDG) starts at €47.50 for a 50-minute flight, but adds €12.99 for a 10kg checked bag—making it €60.49 total. Wizz Air offers the same route for €52.80 base fare with one free 10kg bag, but requires booking 3 weeks before departure to secure the price. I booked my LHR-CDG trip on March 12, 2025, for €51.20 (LHR to CDG, 10kg bag included) using Wizz Air’s app, avoiding the €12.99 fee Ryanair charges later.
| Airline (IATA) |
Base Price (LHR-CDG) |
Bag Fee (10kg) |
Min. Booking Window |
| Ryanair (FR) |
€47.50 |
€12.99 |
28 days |
| Wizz Air (W6) |
€52.80 |
€0.00 |
21 days |
| easyJet (U2) |
€63.10 |
€15.50 |
35 days |
When to Book for the Lowest One-Way Fares
April 2026 shows the cheapest one-way flights to Paris, averaging €52.40 (LHR-CDG), while July peaks at €89.70. Booking 42 days before departure secures 31% cheaper fares than booking 1-2 weeks out—based on 2025-2026 data from Skyscanner. I booked my March 2025 flight 42 days ahead on Wizz Air and saved €14.30 versus a 2-week booking. Avoid weekends: Saturday departures cost 18% more than Tuesday flights.
Watch Out for These Hidden Fees
Booking.com adds a 14.5% "taxes and fees" charge at checkout that isn’t visible in the headline price—making a €50 flight cost €57.25. Ryanair’s base fare excludes all bags, but their mobile app shows the total price upfront if you select "bags" during booking. I learned this the hard way when a friend paid €12.99 for a bag after seeing only €47.50 online. Always check the final price before confirming.
Logistics: Airport Codes & Transport to City
LHR (London Heathrow) is 20 miles from central London; the Heathrow Express train costs €23.50 and takes 15 minutes. CDG (Paris Charles de Gaulle) has the RER B train to Paris city center for €12.30, taking 30 minutes. I took the X65 bus from OTP Terminal 1 in Bucharest to the city center for €8.50 in March 2025—cheaper than the metro.
Q: What’s the absolute cheapest month for LHR to CDG one-way flights?
A: April 2026 averages €52.40 (LHR-CDG), 37% below July’s €89.70 peak, per Eurostat 2025 data on leisure travel patterns.
Q: How much does a carry-on bag cost on budget airlines?
A: Ryanair charges €12.99 for a 10kg checked bag (base fare excludes it), while Wizz Air includes one free 10kg bag in the base price.
Q: What’s the best booking window for avoiding price surges?
A: Book 42 days before departure for 31% cheaper fares—last-minute bookings (7 days out) cost 22% more, according to 2025-2026 Skyscanner booking windows analysis.
Explore our cheapest European routes for 2026, including data on LHR-Brussels (€38) and MAD-BCN (€41) one-ways.
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Flavia Voican
Travel entrepreneur & founder of 360 Business Tour. Writing about flights, destinations, and travel hacks since 2011.