Sydney suburbs where the train beats driving, and by how much
To save you reading: the biggest saving from swapping the car for the train isn't out at the edge of the rail network, it's around the 35-40km mark, where it is worth about $4,350 a year, the whole cost of running the car, not just petrol. Go further out than that and the saving actually shrinks again, because our commute model assumes fewer weekly CBD trips the longer the distance, even though the train fare stays exactly the same.
The biggest saving from switching to the train in Sydney isn't at the edge of the rail network, it's in the 39-44km band, where suburbs like Leppington save up to $4,357 a year. Go further out and the saving actually shrinks again, because the commute model assumes fewer weekly CBD trips the longer the distance, even though the train fare stays flat. Inside about 6km of the CBD, driving is already cheaper than the train, so switching saves nothing at all.
Key statistics
- Biggest saving
- Leppington, $4,357/yr
- Peak-saving band
- 39-44km from CBD
- Train becomes cheaper past
- ~6km from CBD
- Inner-suburb saving
- $0 (driving is cheaper)
Methodology
Driving cost uses the ATO 88c/km rate with modelled trip frequency tapering from 4 return trips a week near the CBD to a floor of 0.5 by about 70km. Train cost uses Transport for NSW Opal adult fares with the weekly travel cap applied. Both are drawn from the same model behind the Greater Sydney Running Cost Index, which covers all 760 Greater Sydney suburbs.
The short version
- Suburbs around 35-40km out save the most by switching to the train, about $4,350 a year, more than suburbs at the true edge of the network
- Inner suburbs save nothing, because they barely drive and the flat Opal fare costs more than their tiny drive
- Driving cost rises with distance out to about 40km, then eases as our model assumes fewer weekly CBD trips further out. Opal fares stay capped at about $2,400 a year throughout, so the gap between the two peaks mid-network, not at the edge
- The catch is whether the train actually goes where you need and whether you will use it
Why the gap exists at all
The maths is more interesting than "further equals more expensive." Driving cost is calculated at the ATO rate per kilometre, which covers fuel, rego, insurance, servicing and depreciation, not just petrol, applied to a modelled number of CBD trips a week. That trip frequency is not fixed: the model assumes 4 return trips a week close to the CBD, tapering down to a floor of 0.5 by about 70km out, on the reasoning that fewer people realistically commute into the city daily from the true far fringe. Multiply a rising distance by a falling trip count and the result is not a straight line, it is a curve that peaks around 35-40km out and eases off beyond that.
Public transport does not follow either curve. Opal fares in Sydney are distance-based but capped, with daily and weekly caps that mean a long trip costs far less per kilometre than a short one, and beyond a certain point the fare stops rising altogether, near $2,400 a year. Because driving peaks around 40km while the train stays flat throughout, the gap between the two is widest in the mid-outer band, not at the edge of the network where you might expect it.
Which produces the actually counterintuitive headline: the people with the most to gain from catching the train are not the ones furthest from the city. They are further out than commuter-belt suburbs like Liverpool or Blacktown, but short of the far exurbs like Camden or Richmond, where our model's driving-cost curve has already started to ease back down.
Where the train saves the most (2026)
These are the suburbs where switching from a daily drive to the train delivers the biggest annual saving. Notice they are not the furthest-out suburbs on the list, they sit in a fairly tight 39-44km band. That is not a coincidence, it is where our model's driving-cost curve peaks.
| Suburb | Approx distance to CBD | Drive/yr | Train/yr | Annual saving |
|---|---|---|---|---|
| Leppington | ~39km | $6,757 | $2,400 | $4,357 |
| Mount Druitt | ~39km | $6,754 | $2,400 | $4,354 |
| Campbelltown | ~43km | $6,725 | $2,400 | $4,325 |
| St Marys | ~43km | $6,718 | $2,400 | $4,318 |
| Oran Park | ~44km | $6,684 | $2,400 | $4,284 |
The saving tops out around $4,350 a year, not at the edge of the network but in this 39-44km band. That is not a rounding error either: over ten years it is more than $43,000, before you even count the second car you might not need to own. Suburbs further out again, like Camden or Richmond at around 51-52km, still save a healthy $3,700-3,800 a year, just not as much as this band, because the model assumes an even lighter weekly CBD commute the further out you go.
The inner-suburb surprise: the train barely helps
Now the flip side, and it catches people out. In inner suburbs the train saves you nothing, because you were never spending much on driving in the first place. A Surry Hills or Redfern resident drives about $630-880 a year to the CBD, which is less than the flat annual Opal fare. Close in, the car is the cheap option, not the expensive one, and the crossover where the train starts winning sits a little past 6km out.
So the advice you hear all the time, just catch public transport, is only financially huge if you live somewhere that drives a lot. For inner-city people it is a nice-to-have. For outer-western people it is potentially the difference between one car and two, which is the biggest lever on the whole household budget.
The honest catch
Numbers are not the whole story. A $4,350 saving only counts if the train actually goes where you need to go, at times that work, and if you will genuinely use it every day rather than caving and driving anyway. Sydney's network is good but it is not everywhere, and past the edge of the rail lines the car is simply the only realistic option. A suburb with a station is a different proposition from one where the station is a twenty-minute drive from your house.
So treat these figures as the size of the prize, not a promise. If your outer suburb has a usable line into the city, the saving is real and large. If it does not, the car cost is what it is. The comparison tool lets you toggle between driving and train for any suburb so you can see your own number, not the average.
Frequently asked questions
How much can you save catching the train instead of driving in Sydney?
The biggest saving is not at the outer edge of the rail network. It peaks around the 35-40km mark, about $4,350 a year, because our commute model tapers the assumed number of weekly CBD trips down as distance grows, so driving cost eases off past about 40km even as Opal fares stay flat. Inner suburbs save nothing, because they already drive very little and the flat fare costs more than the drive.
Is it cheaper to drive or catch the train in Sydney?
It depends on distance. A little past 6km from the CBD the train becomes cheaper, and the gap widens until about 35-40km out, where it peaks around $4,350 a year, then narrows again further out. Closer in than 6km, driving is actually the cheaper option.
See your own drive vs train number
SuburbCost has a toggle between driving and public transport for every Sydney suburb. Flip it and watch the annual cost change for the suburb you are actually looking at.
Compare Sydney suburbs →Data sources
Driving cost: ATO cents per kilometre rate applied to distance to CBD by suburb, with modelled trip frequency tapering from 4 return trips a week near the CBD to a floor of 0.5 by about 70km (see the Greater Sydney Running Cost Index for the full formula). Public transport: Transport for NSW Opal fares including daily and weekly caps. Distances are approximate straight-line to the Sydney CBD. Figures are for comparison only. Data period: 2025-26.
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SuburbCost data is free to cite with attribution. Please link to this page as the source.