A December Departure Itinerary for Southeast Asia

A North America to Bangkok routing with a week-long jetlag-split layover, built for an early-December departure. December is the single best month to arrive in Thailand — cool season, dry, and ahead of the holiday crowds if you move early in the month. The dates below assume a December 1 departure; the whole grid slides with whatever date you actually pick.

Why westbound in December

Honolulu in December sits around 80°F and is mostly dry, with brief passing showers. The eastbound alternatives — Istanbul, Athens — are cold and grey in December, which wastes the layover week you are spending money on. Westbound also wins the jetlag arithmetic outright: it is all day-lengthening travel, and the eleven-to-thirteen hour offset splits cleanly into five zones and then six.

The route

Leg 1 — Tue Dec 1: North America → Honolulu. From the Midwest this is a nine-to-twelve-hour run — roughly nine hours nonstop from a big hub such as Chicago, an hour or three more with one connection from a smaller one such as St. Louis; either way aim to land in the afternoon. Five time zones. From the East Coast it is a longer day with a West Coast connection; from the West Coast it is a short hop and you may prefer Tokyo as the midpoint instead.

Layover week — Dec 1–8: Honolulu and O'ahu. Stay in Waikīkī for convenience or Kailua for calm. Shift sleep about forty-five minutes later each day, which is easy going west — you simply stay up. Fill the week: Pearl Harbor, the North Shore (big-wave season runs December to February, and Pipeline will be firing), Koko Head or the Lanikai Pillbox trail at sunrise, which doubles as clock work, and snorkelling at Hanauma Bay. By day seven you are living five to six hours behind your home zone and within striking distance of Bangkok's day.

Leg 2 — Tue Dec 8: Honolulu → Bangkok via Tokyo or Seoul. Roughly eleven hours plus six, on JAL or Korean one-stops. You cross the date line and land Wednesday Dec 9 in the evening, Bangkok time. Landing in the evening is the whole trick: take a taxi to the apartment, go straight to bed, and wake up basically adjusted. Optionally, turn the connection into a two-or-three-day Tokyo mini-stop — December in Tokyo is crisp and excellent.

Setting up the base — Dec 10–16

Look for a serviced apartment or a monthly condo. Ari is local, leafy and full of good food; Thonglor and Ekkamai offer expat comfort; the riverside gives you views and quiet. Monthly furnished one-bedrooms run about $500–900.

First-week admin: a Thai SIM (an AIS or True eSIM at the airport), the Grab and LINE apps, a BTS Rabbit card, a laundry place you trust, and an eye on the visa clock. As of mid-2026 the visa-free stay is 60 days — but Thailand has approved cutting it to 30, effective on official publication, so check the current rule the week you book. On the 60-day rule, a December 9 start means day 60 lands around February 7; on the 30-day rule you would file the thirty-day extension (roughly 1,900 THB at Chaeng Watthana immigration) in early January to reach the same date, making the visa-reset trip described below essential rather than optional. Longer-stay visas exist for those who qualify. Bangkok in December is the city at its best — Chatuchak weekend market, boat food tours, rooftops that are actually pleasant rather than punishing.

Side trips from the base (each three to five days)

1. Chiang Mai and Chiang Rai — mid or late December. Cool-season mountain air, down into the 60s at night, plus the Sunday Walking Street, Doi Suthep and the sticky waterfall. December is the month here — burning season ruins February through April. Note that the Yi Peng lantern festival falls in late November, so this grid just misses it; departing a week earlier catches it.
2. Siem Reap and Angkor — early January. A one-hour flight. Buy the three-day temple pass: sunrise at Angkor Wat, then Ta Prohm and Bayon. Dry and relatively cool at this time of year.
3. Islands over the holidays (optional) — Dec 24–Jan 2. Peak pricing everywhere; if you are going, book early. Koh Lanta and Koh Yao Noi stay calmer than Phuket or Samui. The alternative is to stay in Bangkok for New Year's Eve, watch the riverside fireworks, and save the islands for late January when prices drop.
4. Luang Prabang, Laos — late January. The slow-travel jewel: the alms ceremony at dawn, Kuang Si falls, sunsets over the Mekong. Cool and dry.
5. Vietnam — early February, doubling as the visa reset. Fly Bangkok to Da Nang for Hoi An, or to Hanoi with an overnight Ha Long Bay cruise, right around the end of the Thai clock, and return on a fresh entry. One planning note: Vietnam gives several European nationalities 45 days visa-free, but US passport holders need an e-visa — 90 days, arranged online for a small fee, roughly two weeks ahead. Northern Vietnam is cool and misty in February; Da Nang and Hoi An are the milder pick.

The clock at a glance

What to book first

1. The two long-haul legs — the flight to Honolulu and the Honolulu to Bangkok connection. Set fare alerts and buy when the price crosses a threshold you have decided on in advance.
2. Honolulu accommodation for the layover week. December is high season there.
3. Any island stay between December 24 and January 2. This sells out before anything else.
4. The first month of your Bangkok apartment. The rest can be found on the ground, and more cheaply.
5. The Angkor pass and Siem Reap flights can wait until you are already in the region.

One preparation worth doing before you leave: learn a little Thai. Even fifty words of greetings, numbers and food vocabulary changes how the first month feels, and if you are routing through Tokyo, the same is true of Japanese.