It’s been a long time since we’ve seen amistake fare as good as this.
And while British Airways has pushed back on honoring these sorts of things in the past it seems pretty clear that under new FTC guidelines they’ll really have no choice.
Your trip has to be entirely on British Airways, and originate in Seattle or New York (please add a comment here if you find it from other British Airways cities, but I haven’t seen it work from anywhere else yet) but apparently you can fly from those cities to anywhere in Europe for about $120 all-in.
The exact price will vary just a bit based on the airport taxes of your destination, and I haven’t been able to get it to work for just London (you need to connect beyond London to somewhere else in Europe).
This fare seems to be bookable only on Expedia.de (Expedia’s Germany site).
It prices out at full fare at first when you select flights — it isn’t going to show up right away for just taxes — but on the final purchase screen the price drops. Make sure to take a screenshot. And of course make sure you see the correct lower mistake price before entering payment details.
Seems available through end of schedule, and at this price I think I’m willing to make a bunch of speculative bookings. While I’d still wait to see that it’s honored before making other non-refundable travel plans, I have to imagine that BA will let you cancel if you wish. (The fare should be refundable but since I’m not getting fare rules through Expedia, and don’t see this as a published mistake – it’s probably an Expedia mistake – I cannot guarantee that, still it’s hard to imagine they won’t just let you cancel).
It only seems to work about half the time, so if it doesn’t go through correctly on your first attempt try again!