Stay overnight in Windsor?

If you're flying out of Heathrow to go home, spending the last night in Windsor is not a bad idea at all. Not that I've done it myself, but I've thought about it so I hope someone with good info chimes in here. That way you could leave your luggage at the hotel and have an unencumbered day out exploring Windsor (I was there a long time ago and want to return).

What are you doing the day after the additional night in London? If you're taking the Eurostar to Paris, my first choice would be to stay somewhere near St. Pancras station. If you're flying somewhere, I'd stay somewhere with good transit connections to the airport (e.g., if you're flying out of Heathrow, you might stay somewhere along the western half of the Piccadilly tube line). Even if your onward travel isn't until late in the day, it makes it easier to store your bags at your hotel for the day and then come back and get them.

At this late date, though, it's probably going to depend a lot on where you can find a hotel that still has availability.

If it's your first night in London and if you fly into Heathrow, it definitely makes sense to make Windsor your first stop. There is easy transportation from Heathrow to Windsor so find a hotel near the airport or in Windsor itself. (If you fly into Gatwick, it's more difficult and time-consuming to get to Windsor, so Windsor is probably not the best choice in that scenario).

If it's your last day in London, definitely consider to pick a location, if possible, that will be close to your departure point for Paris (train or flight?) the next day.

Thanks for noting that it could be the first day of their London stay that's extra, and not the final one. I read the original post rather fast and had the idea this would be their day before departing London, but it doesn't really say that.

thank you! It is our last day in London before catching the Eurostar.

Definitely yes, stay in Windsor if you want to, I've done it and we've flown out of Heathrow from that Windsor Travelodge (rooms found on Travelodge.co.uk I've never found them on anything else, like booking.com or anything) and the taxi ride was so short, it was very helpful. Also it's got a small town feel, nice and mostly quiet before more commotion of travel.
Have fun!
-Alison

It is our last day in London before catching the Eurostar.

You'll need to be at St. Pancras about 45 minutes before your train departs.

I don't know if that's easy peasey starting from Windsor in the morning.

You might consider booking a hotel near St. Pancras on your last day, where you can leave your bags and spend a nice long day out at Windsor before coming back to London in the evening. Then in the morning you wouldn't have a long/complicated journey just to catch your train to Paris.

Windsor is a nice place to overnight, and the journey from there to St. Pancras is not difficult. Trains from Windsor & Eton Riverside go into London Waterloo with no changes. The National Rail journey planner says to get off at Vauxhall (before Waterloo) and take the Victoria Line right to St. Pancras. Time is little over an hour. So depending on what time their Eurostar train leaves, they may or may not have time.

We stayed in Windsor on our way home from Spain a few years back. We stayed in a wonderful B&B which unfortunately is no longer in business. We did not visit the castle, but spent the afternoon walking along the river on the Thames Path, and then wandered into Eton to see a bit of the school ( from the outside) and admire the teen boys in their tailcoats. Then dinner at a very nice Italian restaurant. In the morning we watched the changing of the guard before heading back to Heathrow on the bus.

Our favorite place to spend the night before leaving London is Henley-on-Thames, but that is probably only of interest to rowers.

So you don’t have to fret about travel time and getting to St Pancras an hour before your scheduled departure on the Eurostar, change your hotel and book one near there. So much within walking distance to explore.

The British Library and the Treasure Room. Lovely walk along the Regent Canal. London Canal Museum.

Dishoom restaurant and the St Martins Campus/ Granary Square. So is the Hardy Tree at Old St Pancras church.

This whole area has undergone an enormous amount of gentrification and construction in the last few years. It’s a marvelous example of revitalization. The Gas Towers Project attests to that.

Enjoy!

I've stayed at the Premier Inn almost opposite St Pancras and it was perfectly fine. I've also stayed at the Renaissance St. Pancras which is part of the railway station itself and that was very nice albeit relatively expensive. If I was catching the Eurostar I would want to stay close to St Pancras.

thanks everyone! I booked a hotel somewhat close to st. pancras. as said before--limited availability on hotels! Thank you all for your great input!