Dartford Crossing Alternatives: Every Free and Paid Route Compared
Important Update: Blackwall Tunnel Is No Longer Free
As of April 2025, both the Blackwall Tunnel and the new Silvertown Tunnel are tolled at £1.50-£4.00 per crossing. This significantly changes the alternative route landscape for the Dartford Crossing. The Woolwich Ferry and Rotherhithe Tunnel remain free.
Whether you want to avoid the £3.50 Dart Charge, escape the chronic congestion, or find a route that better suits your journey, there are several alternatives to the Dartford Crossing. However, the landscape changed dramatically in April 2025 when the Blackwall Tunnel — previously the most popular free alternative — became a tolled crossing. This guide compares every option honestly, including cost, journey time, and vehicle restrictions, so you can make an informed decision.
All Thames Crossings Compared
| Route | Cost (Car) | Extra Time | Height Limit | Key Notes |
|---|---|---|---|---|
| Dartford Crossing | £3.50 | Baseline | No limit (bridge: 57m clearance) | Main route. Bridge southbound, tunnel northbound. |
| Blackwall Tunnel | £1.50-4.00 | +30-60 mins | 4.0m | Now tolled since April 2025. Peak/off-peak pricing. |
| Silvertown Tunnel | £1.50-4.00 | +20-40 mins | No restriction | Opened April 2025. New tunnel with modern facilities. |
| Rotherhithe Tunnel | FREE | +40-75 mins | 3.5m | Free but severe height restriction. Single-lane each way. |
| Woolwich Ferry | FREE | +45-90 mins | No limit | Free ferry. Limited hours and capacity. Long waits possible. |
| Western M25 (via Staines) | FREE | Variable (+30-120 mins) | No restriction | Avoids eastern Thames crossings entirely. Best for west-side journeys. |
Last updated April 2026. Times are approximate and vary with traffic conditions. Blackwall/Silvertown prices vary by time of day and payment method.
Which Route Is Best for You?
Select your approximate starting area to get a personalised route recommendation.
Blackwall Tunnel
The Blackwall Tunnel was for decades the most popular free alternative to the Dartford Crossing. Running under the Thames between the A102 in Greenwich (south) and the A1261 in Tower Hamlets (north), it provided a free route for east London crossings. However, since April 2025, the Blackwall Tunnel has been subject to charges as part of the Silvertown Tunnel scheme. Northbound crossings are now charged between £1.50 (off-peak with Auto Pay) and £4.00 (peak without Auto Pay). Southbound remains free.
The Blackwall Tunnel has significant limitations beyond the new charge. The northbound bore has a height restriction of just 4.0 metres, which excludes many commercial vehicles, large vans, and motorhomes. The tunnel is also notoriously congested, with delays frequently exceeding 30 minutes during peak hours. Breakdowns inside the tunnel regularly cause closures, leading to severe tailbacks on the approach roads.
For most drivers travelling between Essex and Kent, the Blackwall Tunnel is no longer a money-saving alternative to the Dartford Crossing. The charge is similar (especially at peak times), the journey is longer, and the congestion is often worse. However, for South London residents heading north to East London, the Blackwall Tunnel may still be the most convenient option despite the new toll.
Silvertown Tunnel
The Silvertown Tunnel opened in April 2025 as a brand-new crossing between Silvertown (north bank) and the Greenwich Peninsula (south bank). Built alongside the existing Blackwall Tunnel, it was designed to relieve congestion on that heavily used route. The tunnel is modern, well-ventilated, and has no height restrictions, making it accessible to all vehicles including HGVs and double-decker buses.
Charges for the Silvertown Tunnel range from £1.50 off-peak to £4.00 at peak times for cars. Auto Pay account holders receive discounted rates. Electric vehicles receive a discount, and Blue Badge holders are exempt from the charge. The tunnel operates the same pricing structure as the Blackwall Tunnel, with charges applying to northbound crossings only (southbound is free).
As an alternative to the Dartford Crossing, the Silvertown Tunnel works best for journeys originating in South East London or North Kent heading to East London or the Docklands area. For standard Essex-to-Kent journeys, it adds significant mileage and is not a practical substitute for the Dartford Crossing. However, for specific routes, the lower off-peak pricing (£1.50 with Auto Pay) can offer savings compared to Dartford's £3.50.
Woolwich Ferry
The Woolwich Ferry is one of the last remaining free Thames crossings and connects Woolwich (south bank) to North Woolwich (north bank). It operates using two modern hybrid ferries (introduced in 2019) that can carry vehicles, pedestrians, and cyclists. The ferry is completely free — no charge, no registration, no account needed.
However, the Woolwich Ferry has significant practical limitations. Operating hours are typically Monday to Saturday 6:15am to 9:15pm and Sunday 11:30am to 7:30pm, though hours can vary and the service is occasionally suspended for maintenance. Vehicle capacity is limited to approximately 200 cars per sailing, and waiting times of 30-60 minutes are common during busy periods. The crossing itself takes about 10 minutes, but factoring in waiting time and the detour from the Dartford Crossing route, using the ferry typically adds 45 to 90 minutes to your journey.
The Woolwich Ferry is best suited for journeys originating in South East London where the ferry is convenient, for drivers with large vehicles that cannot use height-restricted tunnels, or for anyone who simply wants to avoid paying any toll at all and is willing to accept the extra journey time.
Rotherhithe Tunnel
The Rotherhithe Tunnel connects Rotherhithe (south bank) to Limehouse (north bank) in East London. It is free to use and has no tolling plans. However, it has a severe height restriction of just 3.5 metres, which excludes almost all commercial vehicles, vans above transit size, and SUVs with roof boxes. The tunnel is also single-lane in each direction, which makes it prone to severe congestion and extremely vulnerable to breakdowns.
As an alternative to the Dartford Crossing, the Rotherhithe Tunnel is only practical for cars and small vehicles making journeys in the inner East London area. For standard Essex-to-Kent journeys, it adds 40 to 75 minutes and is not a viable route due to the detour required. The tunnel is best viewed as a local London crossing rather than a strategic alternative to the Dartford Crossing.
Western M25 Route
The most unconventional alternative is to bypass the eastern Thames crossings entirely by travelling the western side of the M25. This route takes you through the Dartford-Staines-Heathrow corridor, avoiding all Thames crossing charges. It is free, has no height or weight restrictions, and uses well-maintained motorway.
The main disadvantage is distance. For a journey from north Kent to south Essex, the western M25 route adds approximately 80-100 miles and 30 to 120 minutes depending on traffic conditions around Heathrow and the M3/M4 corridors. This extra distance also means significantly higher fuel costs — at current fuel prices, the additional fuel cost often exceeds the £3.50 Dart Charge.
The western M25 route makes sense in two specific scenarios: first, when the Dartford Crossing is closed (bridge closure due to high winds or major incident), and second, when your actual destination is on the western side of the M25 anyway, making the Dartford Crossing an unnecessary detour. For standard east-side journeys, it is almost never the practical choice.
Is It Worth Avoiding the Charge?
Let us do the maths. If you earn the UK median hourly wage of approximately £15.50 per hour, then spending an extra hour in traffic to save £3.50 is a poor trade-off — your time is worth over four times the charge. Even at minimum wage (£11.44 per hour in 2026), the calculation is marginal.
| Route | Charge Saved | Extra Time | Extra Fuel Cost (est.) | True Saving |
|---|---|---|---|---|
| Woolwich Ferry | £3.50 | 45-90 mins | £2-4 | -£0.50 to +£1.50 |
| Rotherhithe Tunnel | £3.50 | 40-75 mins | £3-5 | -£1.50 to +£0.50 |
| Western M25 | £3.50 | 30-120 mins | £8-15 | -£11.50 to -£4.50 |
| Blackwall/Silvertown | £0-2.00 | 20-60 mins | £1-3 | -£3 to -£1 |
For most drivers, the best strategy is not to avoid the Dartford Crossing but to reduce its cost: set up a pre-pay account (£2.80 per crossing) or cross during the free period (10pm-6am). This saves you £3.50 per crossing without any extra journey time.
Coming in 2034: The Lower Thames Crossing
The Lower Thames Crossing is a new road tunnel connecting the A2/M2 in Kent to the A13/M25 Junction 29 in Essex. Early works are underway with major construction expected in 2028 and the crossing opening in 2034. It is expected to reduce Dartford Crossing traffic by 20-25%. Read our full guide to the Lower Thames Crossing.
Other UK Toll Roads
The Dartford Crossing is not the only toll road in England. If you are planning a longer journey, you may also encounter the M6 Toll in the West Midlands, which provides a bypass around the congested M6 through Birmingham. For cross-channel travel from Kent, the Eurotunnel provides a direct rail link to France.