Istanbul straddles Europe and Asia — the Hagia Sophia, Blue Mosque, Grand Bazaar, and Topkapi Palace span Byzantine and Ottoman history across the Bosphorus.
Istanbul is the only city that straddles two continents, and that geographic miracle shapes everything about it. The Hagia Sophia, Blue Mosque, and Grand Bazaar carry the weight of Byzantine and Ottoman empires, while Beyoglu's galleries and Kadikoy's food scene reflect a modern, creative city. The Bosphorus strait connecting the Black Sea to the Sea of Marmara bisects the city, with ferries crisscrossing between Europe and Asia throughout the day. The call to prayer echoing across the historic peninsula at sunset is one of the world's great urban experiences.
April through June and September through November offer the best weather for exploring -- warm but not sweltering with spring blooms or autumn colors. Summer (July-August) is hot and crowded with cruise ship passengers. Winter (December-February) is cold and rainy but has the cheapest flights and shortest museum lines. The Istanbul Tulip Festival in April transforms the city's parks. October is the Istanbul Biennial month for contemporary art lovers.
Turkish Airlines uses Istanbul as its hub with the world's largest country network serving 340+ destinations globally. Pegasus Airlines provides budget European and domestic routes from Sabiha Gokcen. AnadoluJet serves domestic connections. Qatar, Emirates, and Etihad complement Turkish Airlines coverage. Delta and United serve Istanbul from the US. British Airways, Air France, and Lufthansa offer European connections from their hubs.
Istanbul Airport (IST) opened in 2018 as the new international hub, 35 km northwest with the Havaist bus taking 45-60 minutes to Taksim. A Metro line from IST is partially operational connecting to the M11 line. Sabiha Gokcen Airport (SAW) on the Asian side serves budget airlines with Havabus connecting to Taksim and Kadikoy in 60-90 minutes. Taxis from IST to Taksim cost 300-500 TRY depending on traffic. The airport is one of the world's largest by passenger capacity with extensive shopping.
Istanbul offers extraordinary value -- the Museum Pass Istanbul at 700 TRY saves 50% over individual entries and skips lines. Street food (simit, balik ekmek fish sandwiches under the Galata Bridge) costs 30-60 TRY. The T1 tram connects most major attractions for the price of a transit ticket. The Grand Bazaar haggle starting at 40% of the asking price. Eat at lokantas (local eateries) in Kadikoy instead of Sultanahmet tourist restaurants. Turkish tea costs 5-10 TRY from street vendors.
Istanbul's public transport includes the Metro (M1, M2, M4, M5, M6 lines), the historic T1 tram along the peninsula, funiculars, and extensive bus and ferry networks. An Istanbulkart travel card is essential at 50 TRY initial cost and works on all modes with discounted fares. The T1 tram is the most useful for tourists, connecting Kabatas to Sultanahmet and the Grand Bazaar. Ferries across the Bosphorus cost 15-20 TRY with Istanbulkart and offer the most scenic commutes in the world. Taxis are affordable but have a reputation for scams -- use the official app BiTaksi or Uber. Istanbul traffic is notoriously congested so the Metro and ferries are faster. Walking the historic peninsula between Sultanahmet and Eminonu is pleasant and flat.
Sultanahmet is the historic heart with all major sights walkable, with hotels from 40-100 EUR per night. Beyoglu near Taksim and Istiklal Street offers the best nightlife and dining with mid-range hotels from 30-80 EUR. Karakoy and Galata have trendy boutique hotels from 50-120 EUR with great Bosphorus views. Kadikoy on the Asian side offers authentic local life with great food and lower prices from 25-60 EUR. Budget hostels in Sultanahmet and Taksim from 10-20 EUR.