London to Paris is one of the world's most contested routes — Eurostar vs budget airlines. The answer depends entirely on when you book and what you value. Compare both live on Omio in one search.
The Head-to-Head
| Factor | Eurostar | Budget Flight (Gatwick/Stansted) |
|---|---|---|
| Journey time city-to-city | ~4 hours total | ~5–6 hours total (inc. airports) |
| Terminal convenience | London St Pancras → Paris Gare du Nord | Gatwick/Stansted → CDG/Orly (suburbs) |
| Cheapest fare | From £39 each way | From £25 each way (Ryanair) |
| Average fare (booked 4 weeks out) | £80–£150 each way | £55–£90 each way + luggage |
| Checked luggage included | ✅ Yes | ❌ Usually extra £20–£30 |
| Carbon emissions | ~90% lower than flying ✅ | Higher |
| Train strikes risk | Occasional | Not applicable |
| Bag size restrictions | Generous | Strict on budget airlines |
| Overall verdict | Better if price comparable | Only if significantly cheaper |
When Flying Beats Eurostar
- Budget fare under £35 each way AND you're travelling with hand luggage only
- You're departing from South London and Gatwick is more convenient than St Pancras
- You need very specific times that Eurostar doesn't offer
- Last-minute booking where Eurostar is sold out or very expensive
When Eurostar Beats Flying
- City-centre to city-centre convenience — St Pancras to Gare du Nord is incomparable
- You have luggage — no bag fees, no restrictions, no carousel wait
- You care about carbon footprint — Eurostar uses 90% less CO2 than equivalent flight
- Prices are comparable — the time saving and convenience make Eurostar clearly better
- Weekend breaks — door-to-door, you'll be in central Paris in under 4 hours
💡 Pro Tip: Book Eurostar at least 6–8 weeks ahead for the £39–£59 fares. These sell out fast. Last-minute Eurostar can cost £200+, at which point a flight is clearly better value.
The Carbon Comparison
London to Paris by Eurostar produces approximately 3.4kg CO2 per passenger. London to Paris by flight produces approximately 54kg CO2 per passenger — roughly 16x more. If you have any concern about your travel carbon footprint, Eurostar wins unconditionally.
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See Eurostar, budget airlines and coach options side-by-side. Find the cheapest London to Paris fare for your dates.
Compare on Omio →SentoBot earns a commission if you book through our links — this never affects our recommendations. Transport prices vary by date and availability. Always compare before booking. Updated April 2026.