The phrase "a weekly trip" is correct and usable in written English.
You can use it to describe a journey or outing that occurs once a week.
Example: "Every Saturday, we take a weekly trip to the farmer's market to buy fresh produce."
Alternatives: "a weekly excursion" or "a weekly journey."
My grandparents enjoy a weekly trip across London to visit Kew Gardens.
For years she made a weekly trip to browse a bookstore 40 minutes away in a Scranton suburb.
I wasn't allowed to leave, except for a weekly trip to the market an hour west where I bought food.
Yould saw her husband once a week, and her "big outing," as she put it, was a weekly trip to church.
In France, there was no such thing as a weekly trip to the grocery store: people would buy fresh bread, cheese, and eggs every day.
Maybe a weekly trip to the cinema or pub, the occasional restaurant visit, while putting money aside for an annual holiday.
Each monthly shopping trip takes longer than a weekly shopping trip, so a division of labor will make for a smoother shopping trip (with fewer frazzled nerves).
Surf Air's priciest memberships run slightly over $4,500 per month, but assuming they stay in that same range as the network grows this Fall and beyond, a member making a weekly round trip between London and Zurich and then two weekend trips, or in other words flying six round trips per month, is paying just over $750 per roundtrip per flight.
In addition, there was a single daily round trip to London Stansted Airport, and a weekly round trip to Alicante Airport.
In the car park outside, Markku Puhakainen, 62, a Finn, is anticipating his weekly trip to Russia to buy petrol at less than half the Imatra price.
They are already battling dramatic changes in shopping habits as families turn away from the weekly trip to a supermarket in favour of buying food online, in convenience stores and with the discounters.
