Ask the major fare trackers for the cheapest month to fly to Vietnam and the answers converge more than you would expect. September and October are the most consistently reported cheap months across every origin region we checked, with May the runner-up. Skyscanner's US route data lists September as the usual cheapest month to fly from the United States to Vietnam. Kayak's route pages say September for Los Angeles-Ho Chi Minh City and October for both San Francisco and New York. Google Flights route data points at October from Sydney and from Bangkok, and March-May from Melbourne.
The expensive traps are just as consistent: the Tet window (public holiday February 14-22, 2026, with airline peak scheduling from roughly February 2 to March 3), the June-August school-holiday season (Kayak lists June among the two most expensive months from LAX, SFO, and NYC), and Christmas-New Year (December is the other most expensive month on every US route page we checked).
This guide is the flights companion to our month-by-month price calendar, which covers what you pay on the ground once you land — hotels, cruises, daily budgets. Here we only deal with the seat that gets you there.
What the fare trackers say, origin by origin
We express findings as demand bands, not fare quotes. Where a named tracker published an indicative figure, we repeat it with attribution; everything else stays a band.
| Origin | Cheapest months (source) | Most expensive (source) |
|---|---|---|
| US West Coast (LAX, SFO) | Sep — LAX-SGN, ~$694 return avg (Kayak); Oct — SFO-SGN, ~$747 (Kayak); Sep, ~$625 (Skyscanner US) | Jun + Dec (Kayak, both routes) |
| US East Coast (NYC) | Oct — NYC-SGN, ~$524 return avg (Kayak) | Dec + Jun (Kayak) |
| UK + Western Europe | Feb on average, ~£412 return (Kayak UK) — see Tet caveat; Sep-Oct sample fares near the annual floor (Skyscanner) | Jul-Aug school holidays + Dec |
| Australia (SYD, MEL) | Oct from Sydney; Mar + May from Melbourne (Google Flights route data) | Mid-Dec to late Jan school holidays + Jul |
| Regional (BKK, SIN) | Oct — BKK-SGN (Google Flights); Aug — SIN-HAN (Skyscanner Singapore) | Tet window + Dec |
The UK figure needs its caveat stated plainly: Kayak UK's route-level average makes February the cheapest month from Britain, because early and late February are a post-Christmas demand trough for UK leisure travel. But Tet 2026 sits in the middle of that month, and the specific weeks of February 7-22 behave like peak season on Vietnam-bound seats. Cheap Februaries are real from Europe — outside the Tet window.
Month-by-month fare bands, 2026
Bands describe relative demand and price levels on Vietnam-bound seats from each origin region, synthesized from the sources above plus documented holiday calendars. Low = the origin's cheapest tier; shoulder = mid; peak = the origin's most expensive tier.
| Month | US West Coast | US East Coast | UK + W. Europe | Australia | Regional (BKK/SIN) |
|---|---|---|---|---|---|
| January | Shoulder | Shoulder | Shoulder | Peak | Shoulder |
| February | Peak (Tet) | Peak (Tet) | Shoulder* | Peak (Tet) | Peak (Tet) |
| March | Shoulder | Shoulder | Shoulder | Low | Shoulder |
| April | Low | Shoulder | Shoulder | Shoulder | Shoulder |
| May | Low | Low | Low | Low | Low |
| June | Peak | Peak | Shoulder | Shoulder | Low |
| July | Peak | Shoulder** | Peak | Peak | Shoulder |
| August | Shoulder | Shoulder | Peak | Shoulder | Low |
| September | Low | Low | Low | Shoulder | Low |
| October | Low | Low | Low | Low | Low |
| November | Shoulder | Shoulder | Shoulder | Shoulder | Shoulder |
| December | Peak | Peak | Peak | Peak | Peak |
* Kayak UK's monthly average is cheapest in February, but the Tet weeks (February 7-22, 2026) inside it price like peak — the band reflects the blend. ** Kayak's JFK-specific data shows a July dip (~$505 return average) that contradicts its broader NYC-to-Vietnam data; we band it shoulder and flag the divergence.
Read the table vertically and two things stand out. October is the only month banded low from all five origins. September misses only Australia (where late-September school holidays begin). May is low everywhere too — it is the last quiet month before Northern Hemisphere summer demand arrives.
Why the pattern exists
Airfare seasonality into Vietnam is three demand cycles stacked on top of each other.
The Tet diaspora cycle. Vietnam has one of the world's larger diasporas, concentrated in California, Texas, Australia, and France — exactly the origins in our table. When Tet approaches, overseas Vietnamese fly home in volume: Vietnamese tourism reporting put returning overseas visitors up roughly 30 percent year on year for Tet 2026. Airlines respond with capacity — Vietnam Airlines Group released over 3.5 million Tet seats (up nearly 20 percent) and Vietjet added about 1,800 flights for the February 2 to March 3 window — but demand still outruns supply on the peak days. Vietnamese press documented trunk-route fares up to 40 percent above off-peak, and Bangkok-Vietnam round trips roughly doubling over the holiday.
The school-holiday cycle. June-August is peak from North America and Europe because that is when families can travel; Kayak's most-expensive-month data (June and December on US routes) matches it. Australia inverts the calendar: the mid-December to late-January summer break makes January a peak month from Sydney and Melbourne, with a second bump in July.
The winter-sun cycle. European demand for Southeast Asia builds from November through March — Vietnam's dry-season showcase months — which keeps November-January fares from Europe above the September-October floor even without any holiday on the calendar.
Capacity runs its own counter-cycle underneath: airlines add seats into the peaks and trim them in the troughs, which is why the troughs are cheap but never free-falling, and why route launches (below) matter more for shoulder-season pricing than for Tet.
Tet 2026 is the single biggest fare trap
The dates, aligned with our festival calendar atlas: Tet falls on Tuesday, February 17, 2026 (Year of the Horse), with a 9-day national public holiday from February 14 to 22 — the longest official Tet break on record, per Decision 1369/QĐ-LĐTBXH. Airlines treat roughly February 2 to March 3 as the peak window; the reported super-peak departure day is February 10, with the return crush on February 21-22.
For a foreign visitor the practical rule is simple: keep your long-haul arrival and departure out of February 7-25 if price matters. If you must fly in that window — many travelers do, deliberately, for the holiday itself — book when Tet sales open in September-October 2025-style timing, fly mid-week, and expect domestic connections to be the scarcest seats of all.
When to book, according to published data
- Shoulder and low season (Mar-May, Sep-Nov): Kayak's route pages cluster around booking 6-7 weeks out, with claimed savings of 20-23 percent versus last-minute on LAX, SFO, and NYC routes. Its LAX-SGN data put the absolute lowest fares around 25 weeks out.
- Peak season (Tet, Jun-Aug, Christmas): book as soon as schedules open — for Tet, that means the September-October sale window the year before. The cheapest fare buckets on peak dates sell first and are not re-filed.
- Day-of-week effects: Expedia's 2025 Air Hacks Report (built on ARC ticketing data) found Sunday bookings save up to 17 percent on international fares versus Friday or Monday, and Kayak lists Tuesday or Wednesday as the cheapest departure days on US-Vietnam routes.
Treat all of this as tendency, not law — averages that any single date pair can defy.
Layover economics: the hub discount
The one-stop discount is one of the most consistently reported patterns on Vietnam routes. From the US West Coast, Kayak's cheapest listed itineraries run via Taipei (China Airlines, EVA Air, Starlux), Seoul (Asiana, Korean Air), or Singapore — frequently priced below Vietnam Airlines' San Francisco-Ho Chi Minh City nonstop, the only US nonstop. From Europe, one-stops via Gulf hubs and Bangkok routinely undercut direct services.
The backpacker variant: buy a cheap long-haul fare into Bangkok or Singapore — both hyper-competitive hubs with deep low-cost capacity — then a separate VietJet, AirAsia, or Scoot hop into SGN, HAN, or DAD. Outside the Tet window those regional hops are among the cheapest international sectors anywhere. The hedge: separate tickets mean no misconnection protection, and low-cost baggage fees can erase a thin saving.
Capacity watch: what could soften 2026 fares
More seats generally mean softer fares, so we track supply news as a leading indicator rather than a promise:
- US: Vietnam Airlines' SFO-SGN remains the only nonstop; Los Angeles is planned but undated (Simple Flying).
- Europe: Vietnam Airlines launched Hanoi-Amsterdam and is adding frequencies; Vietjet's first European route, Hanoi-Prague, starts October 10, 2026.
- Australia: Vietjet has grown to five Australian gateways, most recently Perth, keeping low-cost pressure on the SYD/MEL-SGN trunk.
- Fleet and infrastructure: Vietjet took 22 new aircraft in 2025 (its largest annual expansion) across 202 international routes; Long Thanh International Airport outside Ho Chi Minh City is slated to open in mid-2026.
If these land on schedule, the September-October and May troughs should stay soft; if deliveries slip, expect the opposite.
Limitations
- We compile published seasonality, not live fares. The bands synthesize route-page data from Kayak, Skyscanner, Google Flights, and Expedia/ARC as accessed in July 2026; those pages recompute continuously and their snapshots will drift.
- Bands are not quotes. A low-band month does not guarantee a cheap fare on your dates, and a peak-band month can still produce deals on unpopular day pairs.
- Route-level averages disagree with each other — Kayak's JFK data names July cheap while its NYC data names July-adjacent months expensive; Kayak UK's February average blends a demand trough with the Tet spike. We flag divergences rather than smooth them away.
- Currency and fuel are unmodeled. Exchange-rate moves and fuel surcharges shift absolute fares without changing the seasonal shape.
- Capacity news is a hedge. Announced routes slip; Long Thanh's mid-2026 opening and Vietjet's Prague launch are plans, not history.
- Tet dates are fixed; Tet pricing behavior is not — the February 2 to March 3 peak window reflects 2026 airline scheduling announcements and may widen.
How to cite this
Nguyen, J. (2026). Cheapest Month to Fly to Vietnam: 12 Months of Data. Day Trips Vietnam. Retrieved from https://daytripsvietnam.com/guides/cheapest-month-to-fly-to-vietnam-2026/
Machine-readable dataset: /data/vietnam-flight-seasonality-2026.json. Published under Creative Commons BY 4.0. Editorial enquiries: info@daytripsvietnam.com.
Related research and reference
- Cheapest Time to Visit Vietnam 2026 — the on-the-ground price calendar this guide complements
- Vietnam Festival Calendar Atlas 2026 — Tet and holiday dates used here
- Cheap Domestic Flights in Vietnam 2026 — the onward hop after you land
- Vietnam Travel Cost Index 2026 — full-tier cost baseline