How to Add Companionship to Budget Travel : A Swiss organization offers guided group tours by foot or bicycle for travelers 16 to 30.

Worried that you might be lonely traveling on your own through Europe? Fear not. There are ways of getting around those feelings.

For example, it’s often possible to arrange to spend a week or two with other international travelers by joining programs organized by foreign student and youth travel services.

One organization, Jugi Tours, the travel service of the Swiss Youth Hostel Assn., is offering young international travelers the opportunity to join small guided groups for economical hiking, biking and sports programs this summer.

Among trips being offered is a multi-sports week called “Swiss Safari,” which includes mountain biking, rafting, climbing and summer skiing. And for those who want to try cycling on bicycles built for two, there are four-night guided tandem tours.

The Swiss Safari programs include five nights’ accommodations in youth hostels or huts, plus breakfasts and dinners, one-day ski rental and lift ticket in Zermatt, entrance to the thermal baths in Brierbad, and the services of tour and mountain guides. The cost is about $530. Tours begin July 7 and 19, and Aug. 9.

Those touring on tandems can bring their own partners or team up with someone in the group. The program fees include bike rentals, hostel accommodations, breakfasts and dinners, guide services and some local transportation.

Tandem tours include:

* “Glorious Gruyeres,” which covers 15-25 miles per day and costs about $380. Start dates are July 19 and Aug. 8.

* “French Jura,” covering 35-50 miles per day and costing about $400. Start dates are July 26 and Aug. 9.

Two types of cycling programs are available to travelers ages 16-30 who want to ride regular-size bikes with a group of about 15 international travelers and a guide. The easier version (covering 30-50 miles per day), “Tour de Suisse,” is a 14-night tour that starts at the Schaffhausen Youth Hostel on the German border on July 11 and 25, and visits Zurich, the Bernese Oberland and Lucerne. The cost is about $400. The seven-night Basel-to-Lausanne tour covers up to 56 miles per day.

Both packages include hostel accommodations, breakfasts and dinners, and guide services. You can bring your own bike or rent one, and you must be prepared to carry your luggage on your bike.

Hikers have a choice between programs that base you in one location and take different day trips (you never have to worry about carrying your luggage), or tours that have you staying in different hostels and huts each evening (you’ll need to carry your belongings).

Three programs are offered those who want to hike from a home base. Each includes seven nights’ youth hostel accommodations, breakfasts and dinners, local transportation and guide services. Hikers walk from three to seven hours per day:

* The Zermatt hiking week costs about $270 and starts July 7 and 24, and Oct. 10.

* Grindelwald costs about $260 and starts July 7 and 31, and Oct. 9.

* Arosa costs about $255 and starts July 17, Aug. 7 and Oct. 9.

Travelers 16-30 who don’t mind transporting their belongings to a different location daily have four walking tours from which to choose. You can expect to hike five to nine hours per day:

* The 14-night Graubunden walking tour (St. Moritz, Arosa and Davos) costs about $500 and starts on July 4 and 25.

* The 14-night Bernese Oberland tour costs about $560 and starts July 18 and Aug. 1.

* The seven-night Jungfrau-to-Matterhorn tour costs $480 and starts July 10 and 24, and Aug. 8.

* The eight-night Ticino walking tour costs about $400, and starts July 17 and 31, and Oct. 2.

For more information on any of these tours, contact Jugi Tours, Neufeldstrasse 9, CH-30l2, Bern, Switzerland, from U.S. telephones 011-41-123-2621, fax 011-41- 123-6671.

Independent travelers in Switzerland who want to set up their own agenda can find bicycles for rent at many Swiss railway stations, plus economical accommodations at more than 80 youth hostels, and, for hikers, more than 30,000 miles of well-kept walking paths.

The Swiss National Tourist Office can provide free copies of “Know-How ‘93,” which provides a detailed map of Switzerland that includes information on 80 youth hostels located throughout the country. There are no age restrictions at hostels. However, when space is tight, preference is given to travelers under the age of 25.

Free brochures and information on hiking and biking routes are also available from the Swiss National Tourist Office, 222 N. Sepulveda Blvd., Suite 1570, El Segundo 90245, (310) 335-5980.