Paris
Although across the Channel, Paris can still make a great day trip away from London. Paris, however, is going to be one of the more expensive day trips away from London.
Traveling to Paris!
To get to Paris there are three options, plane, train, or bus. The price is obviously dependent on which method you take. For all these options, planning ahead and booking in advance aids in keeping the cost manageable.
Lodging:
When it comes to staying in Paris, you might want to splurge for an Airbnb inside the city. It will save you money in the long run to be within the city instead of paying for trains or the metro. Paris is a beautiful city and much of it remains quite walkable.
Feel free to check out the Night Adoration at Sacre Coeur.