Taxi from Bath to Heathrow?

For convenience it will win hands down. There are though cheaper public transport routes though than the one that you suggest; train to Reading and the coach from there would be £52 at the cheapest for both of you or £48 on a direct coach. Of course you would have to add on getting to your hotel, but as you haven't named it I can't make any suggestions.

It is a Bank Holiday weekend which may inflate the taxi cost, but not as much as on the Bank Holiday itself.

by public transport the best way from Bath to Heathrow is the national express coach

direct on 29 August from £24 per person

http://www.nationalexpress.com/airports/heathrow-airport.aspx

Going by car would be the most convenient, and would let you leave Bath as late as possible. It would also take you direct to the hotel, and not leave you with walking or getting a bus for the last half mile.

You use the word "taxi", but don't just go to a taxi rank in the street. It would be best to book a car in advance from one of the Bath companies you can find through Google. They do these journeys all the time, and have spacious, comfortable cars and accomplished drivers.

Marco, thanks. We are leaving from the Three Abbey Green hotel in Bath to the Premier Inn (Terminal 5) Heathrow. I had not thought to look up the Reading train and then coach. Not even sure how to look this up.

Ramblin, thanks. The coach appears to leave at 16:15, takes 3.5 hours, and would be £54 for 2. But I'd have to perhaps add some taxi to this.

Thanks Bob, the taxi's I've looked up are in the area of £135 (for example: taxi). I don't know about tipping for this taxi. Kind of pricey but convenient. I could call our Bath hotel and ask for a reference. Perhaps I could book a few days before as we will be in bath for 3 nights.

"But I'd have to perhaps add some taxi to this. "

You could take the Heathrow Hoppa from Terminal 5 to the Premier Inn - £4.50 per person
http://www.nationalexpress.com/airports/heathrow-hotel-hoppa.aspx

the link below explains how to buy a RailAir ticket from Reading to Heathrow and how to buy train tickets from Bath to Reading

http://www.railair.com/tickets_combined.php

In giving you the various options, we have all ignored an important factor.

The railway line from London to Bristol is currently being electrified, and the line east of Bath will be completely or partially closed for much of the summer. That is especially true during August. Details are available at www.firstgreatwestern.co.uk if you click on "Travel Updates".

I understand that the major work is lowering the track in Box Tunnel to accommodate the overhead electrification wires. Box Tunnel is a structure of historic significance, so the work has to be done carefully. That is also true of the section of track through Sidney Gardens in Bath.

Hence the 'steer' towards the coach more for public transport. Train journeys from Bath to London will be via Bristol in August.

So it sounds like the choices are (1) taxi, (2) taxi-coach-Hoppa. Probably (1) is about 2x the cost but 1/2 the hassle. I know which choice my wife will vote for ;) -- the easy one. Thanks everyone.