[slg]

For what it is worth, flights between the UK and the US are some of the most heavily taxed flights in the world. Sometimes you are better off with a connecting flight from a European carrier that stops somewhere like France or Ireland.

[fendale]

I live in Belfast so I can either use a UK airport (Belfast), or Dublin. In my previous job, we flew business class from the UK to San Fran fairly regularly. It was often £500 - £1000 cheaper to fly Dublin to SFO connecting through London than Belfast -> London -> SFO. Infact, even pricing the London to SFO on the same flight (leaving out the Belfast leg), it was £500 cheaper to start in Dublin.

The price difference was all tax - and lots of it!

[arprocter]

The strangest thing I've come across was saving several hundred pounds by booking a return flight instead of one way, and just not using the flight back.

[JoshGlazebrook]

This is what SkipLagged does for customers.

[stephenc_c_]

I started a recent flight from LHR to SFO in DUB and saved about £1000 in business class. The flight actually went DUB-LHR-SFO so you end up going back to where you started, but it worked out significantly cheaper!

[nly]

Last two times I've been I've not been able to find an advantage in doing so.