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Birmingham to Gatwick in one minute
Birmingham to Gatwick is a long enough trip that the choice of mode really matters, and it turns on speed against simplicity. There is no direct train, so the fastest rail route, about 2 hours 32 minutes, involves a change and most often a cross-London leg. The direct National Express coach is the opposite: one seat the whole way and the cheapest fare, from about £8, but nearly four hours. Driving is roughly 2 hours 30 minutes to 3 hours when the motorways are clear, which they often are not.
The one-line answer: take the train if speed matters and you do not mind a change and crossing London with your bags; take the direct coach if you would rather stay put in one seat for a low fare and can spare the time; and drive if you have a group or an early flight and somewhere to park. There is also a quieter rail option, via Reading, that avoids London altogether, covered below. The same choices apply in reverse for Gatwick to Birmingham.
By rail: fastest, but across London
There is no direct train, so the quickest rail route runs up to London and back out: a fast service from Birmingham to London, then across the capital to pick up a Gatwick train, about 2 hours 32 minutes all in with one change. It is the fastest way from Birmingham to the airport on paper, but the cross-London leg is the catch, since it means moving between London stations with your luggage, usually on the Underground, in the middle of the trip. Advance singles start from about £13 booked ahead, with walk-up fares much higher.
There is a calmer alternative for anyone who would rather not cross London. Travel via Reading and change there onto the North Downs line, the direct Reading to Gatwick service, and you avoid central London entirely, at the cost of a little extra time. Which is better depends on your start point and the day, so it is worth comparing both when you book. The train overview sets out the operators and how the connections work, and booking ahead is the difference between a fair fare and an expensive one over this distance.
By coach: direct and cheapest
National Express runs a direct coach between Birmingham and Gatwick, roughly hourly and every day, taking about 3 hours 55 minutes. It is the slowest option, but it is also the cheapest, from about £8 one way booked ahead, and it is direct, so there is no change to manage and no cross-London leg with your bags. For a lot of travellers, that combination of a low fare and a single seat outweighs the extra time.
The trade-off is the clock and the motorway. Nearly four hours is a long stint, and the coach shares the M40 or M42 and the M25 with everyone else, so heavy traffic can stretch it further, which matters when a flight is waiting. It suits travellers who value simplicity and cost over speed, and who build in enough slack. The coach guide covers how the airport coaches work and where they set down at Gatwick, and the cheap advance fares climb closer to the day, so book early.
Driving from Birmingham
Driving is a long motorway run down the middle of the country: the M40 or the M42 and M40, round the M25, and on to the M23 and Junction 9 for the airport, roughly 2 hours 30 minutes to 3 hours in clear traffic. The M25 in particular is congestion-prone, so the peaks and holiday getaways can add a good deal, making the car the least predictable option for timing a flight. In clear conditions it is competitive with the fastest rail route and avoids the cross-London change.
For a family or a group the car can win on cost per head and on convenience, provided you have somewhere to leave it at the airport. That turns the decision into a parking one: booked online, the official Gatwick car parks cost up to 60% less than the drive-up rate, and the right product depends on how long you are away. The parking guide compares every option by stay length, so you can weigh driving and parking against the fares above.
Which to choose
The decision is genuinely a trade-off, not a clear win for one mode. Rail is fastest at about 2 hours 32 minutes, but the quick route crosses London with a change; if that puts you off, the via-Reading rail option trades a little time for a calmer trip. The direct coach is the cheapest and simplest, one seat from about £8, at the cost of nearly four hours. Driving is competitive in clear traffic but the least reliable and adds a parking cost. Pick the one whose downside you mind least.
Whichever you choose over this distance, book ahead, because Advance rail and coach fares both rise steeply towards the day. The neighbouring long corridors, Oxford to Gatwick and Bristol to Gatwick, weigh the same options, and the transfers hub lines up every mode for your exact trip. If you are flying from Gatwick, check which terminal your airline uses before you travel, so you know whether the free shuttle is part of your arrival at the airport.