By Car -- The Blue Lagoon is less than an hour from Reykjavík, and just 15 minutes from Keflavík International Airport. From Route 41, which connects Reykjavík and Keflavík, turn south on Route 43. After about 8km (5 miles), turn right on Route 426 and follow the signs.
By Bus -- A public bus goes to the Blue Lagoon from BSÍ terminal in Reykjavík, but organized bus tours include the entrance fee and work out to almost the same price, plus they'll pick you up at your hotel. A free shuttle operated by Bláa Línan (Blue Line) connects the Blue Lagoon to the airport and the town of Keflavík, including most hotels, with seven departures daily in summer only. Three rounds also extend to Grindavík. For a schedule, call tel. 420-6000 or visit www.bluelagoon.com and click "Blue Lagoon Spa."
Organized Tours -- "Tours" to the Blue Lagoon do not include a guide and are really just shepherding. Þingvallaleið (tel. 511-2600; www.bustravel.is) has the best deal: 3,500kr ($56/£28) includes Reykjavík hotel pickup and dropoff plus admission to the Lagoon. There are six round-trips daily between 9:30am and 6pm, plus three trips from the Lagoon to the airport. Reykjavík Excursions (tel. 562-1011; www.re.is) has the same offer for 3,800kr ($61/£30); children 11 to 15 are half-price, under 11 free. They also have an evening tour that leaves Reykjavík at 6pm and gets you back at 10pm -- order dinner from the restaurant before you jump in.
Note: This information was accurate when it was published, but can change without notice. Please be sure to confirm all rates and details directly with the companies in question before planning your trip.