Typical price difference
+7%฿5,681 here compared with ฿5,310
One-way and roundtrip flights from Bangkok26°Warm
Flights to Hanoi in December 2026
🏙️City🛍️Shopping
DepartureTue, Dec 15± 15 days
One way from ฿2,682 · Roundtrip from ฿5,169.Top deals
Flights and prices
How much are flights from Bangkok to Hanoi?
Planning a trip to Hanoi? Compare dates, airlines, flight times and direct options from Bangkok. 31 one-way fares from ฿2,682 · 612 roundtrips from ฿5,169. These results are for december 2026.
- One way from
- ฿2,682
- 31 outbound-only options
- Roundtrip from
- ฿5,169
- 612 complete trips
- Typical roundtrip
- ฿5,681
- Half cost less, half cost more
- Flight options
- 612
- Roundtrips available
Saved searches
Save this search
Filters
Sort bySort by
Best Deals
Roundtrip deals
611 fares · from ฿5,100
Outbound and return flights together in one total fare.
Trip datesFlight itineraryTotal fareView
Nov 30 → Dec 1717 nights
Roundtrip
- Depart
- Nov 30
- Return
- Dec 17
Out18:30DMK → HAN20:151h 45m · Direct1h 45m · Direct
Return20:50HAN → DMK22:401h 50m · Direct1h 50m · Direct
Outbound18:30DMK20:15HAN1h 45mDirect
Return20:50HAN22:40DMK1h 50mDirect
Operated by
Thai AirAsia
Thai AirAsia฿5,100
฿5,418-6%
Save ฿318
Thai AirAsiaRoundtrip total฿5,100฿5,418−6%Save ฿318View deal
Dec 2 → Dec 1816 nights
Roundtrip
- Depart
- Dec 2
- Return
- Dec 18
Out09:25BKK → HAN11:151h 50m · Direct1h 50m · Direct
Return12:05HAN → BKK14:052h · Direct2h · Direct
Outbound09:25BKK11:15HAN1h 50mDirect
Return12:05HAN14:05BKK2hDirect
Operated by
Thai VietJet Air
Thai VietJet Air฿5,169
฿5,418-5%
Save ฿249
Thai VietJet AirRoundtrip total฿5,169฿5,418−5%Save ฿249View deal
Cheapest of December 2026
Dec 1 → Dec 1716 nights
Roundtrip
- Depart
- Dec 1
- Return
- Dec 17
Out18:30DMK → HAN20:151h 45m · Direct1h 45m · Direct
Return09:15HAN → DMK11:101h 55m · Direct1h 55m · Direct
Outbound18:30DMK20:15HAN1h 45mDirect
Return09:15HAN11:10DMK1h 55mDirect
Operated byThai AirAsia
Thai AirAsia฿5,174
฿5,418-5%
Save ฿244
Thai AirAsiaRoundtrip total฿5,174฿5,418−5%Save ฿244View deal
Cheapest of December 2026
Dec 2 → Dec 1715 nights
Roundtrip
- Depart
- Dec 2
- Return
- Dec 17
Out18:30DMK → HAN20:151h 45m · Direct1h 45m · Direct
Return20:50HAN → DMK22:401h 50m · Direct1h 50m · Direct
Outbound18:30DMK20:15HAN1h 45mDirect
Return20:50HAN22:40DMK1h 50mDirect
Operated byThai AirAsia
Thai AirAsia฿5,174
฿5,418-5%
Save ฿244
Thai AirAsiaRoundtrip total฿5,174฿5,418−5%Save ฿244View deal
Cheapest of December 2026
Dec 2 → Dec 1311 nights
Roundtrip
- Depart
- Dec 2
- Return
- Dec 13
Out09:25BKK → HAN11:151h 50m · Direct1h 50m · Direct
Return12:05HAN → BKK14:052h · Direct2h · Direct
Outbound09:25BKK11:15HAN1h 50mDirect
Return12:05HAN14:05BKK2hDirect
Operated byThai VietJet Air
Thai VietJet Air฿5,182
฿5,418-4%
Save ฿236
Thai VietJet AirRoundtrip total฿5,182฿5,418−4%Save ฿236View deal
Lowest 10% of December 2026
Dec 8 → Dec 179 nights
Roundtrip
- Depart
- Dec 8
- Return
- Dec 17
Out06:55DMK → HAN08:451h 50m · Direct1h 50m · Direct
Return09:15HAN → DMK11:101h 55m · Direct1h 55m · Direct
Outbound06:55DMK08:45HAN1h 50mDirect
Return09:15HAN11:10DMK1h 55mDirect
Operated byThai AirAsia
Thai AirAsia฿5,199
฿5,418-4%
Save ฿219
Thai AirAsiaRoundtrip total฿5,199฿5,418−4%Save ฿219View deal
Lowest 10% of December 2026
Dec 2 → Dec 1210 nights
Roundtrip
- Depart
- Dec 2
- Return
- Dec 12
Out09:25BKK → HAN11:151h 50m · Direct1h 50m · Direct
Return12:05HAN → BKK14:052h · Direct2h · Direct
Outbound09:25BKK11:15HAN1h 50mDirect
Return12:05HAN14:05BKK2hDirect
Operated byThai VietJet Air
Thai VietJet Air฿5,201
฿5,418-4%
Save ฿217
Thai VietJet AirRoundtrip total฿5,201฿5,418−4%Save ฿217View deal
Lowest 10% of December 2026
Dec 2 → Dec 2018 nights
Roundtrip
- Depart
- Dec 2
- Return
- Dec 20
Out09:25BKK → HAN11:151h 50m · Direct1h 50m · Direct
Return12:05HAN → BKK14:052h · Direct2h · Direct
Outbound09:25BKK11:15HAN1h 50mDirect
Return12:05HAN14:05BKK2hDirect
Operated byThai VietJet Air
Thai VietJet Air฿5,201
฿5,418-4%
Save ฿217
Thai VietJet AirRoundtrip total฿5,201฿5,418−4%Save ฿217View deal
Lowest 10% of December 2026
Dec 2 → Dec 108 nights
Roundtrip
- Depart
- Dec 2
- Return
- Dec 10
Out09:25BKK → HAN11:151h 50m · Direct1h 50m · Direct
Return12:05HAN → BKK14:052h · Direct2h · Direct
Outbound09:25BKK11:15HAN1h 50mDirect
Return12:05HAN14:05BKK2hDirect
Operated byThai VietJet Air
Thai VietJet Air฿5,234
฿5,418-3%
Save ฿184
Thai VietJet AirRoundtrip total฿5,234฿5,418−3%Save ฿184View deal
Lowest 10% of December 2026
Dec 2 → Dec 97 nights
Roundtrip
- Depart
- Dec 2
- Return
- Dec 9
Out09:25BKK → HAN11:151h 50m · Direct1h 50m · Direct
Return12:05HAN → BKK14:052h · Direct2h · Direct
Outbound09:25BKK11:15HAN1h 50mDirect
Return12:05HAN14:05BKK2hDirect
Operated byThai VietJet Air
Thai VietJet Air฿5,241
฿5,418-3%
Save ฿177
Thai VietJet AirRoundtrip total฿5,241฿5,418−3%Save ฿177View deal
Lowest 10% of December 2026
Nov 30 → Dec 1818 nights
Roundtrip
- Depart
- Nov 30
- Return
- Dec 18
Out06:55DMK → HAN08:451h 50m · Direct1h 50m · Direct
Return12:05HAN → BKK14:052h · Direct2h · Direct
Outbound06:55DMK08:45HAN1h 50mDirect
Return12:05HAN14:05BKK2hDirect
Operated byThai AirAsiaThai VietJet Air
Thai AirAsiaThai VietJet Air฿5,262
฿5,418-3%
Save ฿156
Thai AirAsiaThai VietJet AirRoundtrip total฿5,262฿5,418−3%Save ฿156View deal
Nov 30 → Dec 1414 nights
Roundtrip
- Depart
- Nov 30
- Return
- Dec 14
Out18:30DMK → HAN20:151h 45m · Direct1h 45m · Direct
Return12:05HAN → BKK14:052h · Direct2h · Direct
Outbound18:30DMK20:15HAN1h 45mDirect
Return12:05HAN14:05BKK2hDirect
Operated byThai AirAsiaThai VietJet Air
Thai AirAsiaThai VietJet Air฿5,264
฿5,418-3%
Save ฿154
Thai AirAsiaThai VietJet AirRoundtrip total฿5,264฿5,418−3%Save ฿154View deal
Nov 30 → Dec 1010 nights
Roundtrip
- Depart
- Nov 30
- Return
- Dec 10
Out18:30DMK → HAN20:151h 45m · Direct1h 45m · Direct
Return12:05HAN → BKK14:052h · Direct2h · Direct
Outbound18:30DMK20:15HAN1h 45mDirect
Return12:05HAN14:05BKK2hDirect
Operated byThai AirAsiaThai VietJet Air
Thai AirAsiaThai VietJet Air฿5,269
฿5,418-3%
Save ฿149
Thai AirAsiaThai VietJet AirRoundtrip total฿5,269฿5,418−3%Save ฿149View deal
Nov 30 → Dec 1515 nights
Roundtrip
- Depart
- Nov 30
- Return
- Dec 15
Out18:30DMK → HAN20:151h 45m · Direct1h 45m · Direct
Return12:05HAN → BKK14:052h · Direct2h · Direct
Outbound18:30DMK20:15HAN1h 45mDirect
Return12:05HAN14:05BKK2hDirect
Operated byThai AirAsiaThai VietJet Air
Thai AirAsiaThai VietJet Air฿5,269
฿5,418-3%
Save ฿149
Thai AirAsiaThai VietJet AirRoundtrip total฿5,269฿5,418−3%Save ฿149View deal
Nov 30 → Dec 1313 nights
Roundtrip
- Depart
- Nov 30
- Return
- Dec 13
Out06:55DMK → HAN08:451h 50m · Direct1h 50m · Direct
Return12:05HAN → BKK14:052h · Direct2h · Direct
Outbound06:55DMK08:45HAN1h 50mDirect
Return12:05HAN14:05BKK2hDirect
Operated byThai AirAsiaThai VietJet Air
Thai AirAsiaThai VietJet Air฿5,275
฿5,418-3%
Save ฿143
Thai AirAsiaThai VietJet AirRoundtrip total฿5,275฿5,418−3%Save ฿143View deal
Nov 30 → Dec 99 nights
Roundtrip
- Depart
- Nov 30
- Return
- Dec 9
Out06:55DMK → HAN08:451h 50m · Direct1h 50m · Direct
Return12:05HAN → BKK14:052h · Direct2h · Direct
Outbound06:55DMK08:45HAN1h 50mDirect
Return12:05HAN14:05BKK2hDirect
Operated byThai AirAsiaThai VietJet Air
Thai AirAsiaThai VietJet Air฿5,275
฿5,418-3%
Save ฿143
Thai AirAsiaThai VietJet AirRoundtrip total฿5,275฿5,418−3%Save ฿143View deal
Nov 30 → Dec 2121 nights
Roundtrip
- Depart
- Nov 30
- Return
- Dec 21
Out18:30DMK → HAN20:151h 45m · Direct1h 45m · Direct
Return10:55HAN → BKK12:552h · Direct2h · Direct
Outbound18:30DMK20:15HAN1h 45mDirect
Return10:55HAN12:55BKK2hDirect
Operated byThai AirAsia
Vietravel Airlines
Thai AirAsiaVietravel Airlines฿5,291
฿5,418-2%
Save ฿127
Thai AirAsiaVietravel AirlinesRoundtrip total฿5,291฿5,418−2%Save ฿127View deal
Nov 30 → Dec 1111 nights
Roundtrip
- Depart
- Nov 30
- Return
- Dec 11
Out18:30DMK → HAN20:151h 45m · Direct1h 45m · Direct
Return12:05HAN → BKK14:052h · Direct2h · Direct
Outbound18:30DMK20:15HAN1h 45mDirect
Return12:05HAN14:05BKK2hDirect
Operated byThai AirAsiaThai VietJet Air
Thai AirAsiaThai VietJet Air฿5,295
฿5,418-2%
Save ฿123
Thai AirAsiaThai VietJet AirRoundtrip total฿5,295฿5,418−2%Save ฿123View deal
Nov 30 → Dec 1212 nights
Roundtrip
- Depart
- Nov 30
- Return
- Dec 12
Out18:30DMK → HAN20:151h 45m · Direct1h 45m · Direct
Return12:05HAN → BKK14:052h · Direct2h · Direct
Outbound18:30DMK20:15HAN1h 45mDirect
Return12:05HAN14:05BKK2hDirect
Operated byThai AirAsiaThai VietJet Air
Thai AirAsiaThai VietJet Air฿5,295
฿5,418-2%
Save ฿123
Thai AirAsiaThai VietJet AirRoundtrip total฿5,295฿5,418−2%Save ฿123View deal
Nov 30 → Dec 2020 nights
Roundtrip
- Depart
- Nov 30
- Return
- Dec 20
Out18:30DMK → HAN20:151h 45m · Direct1h 45m · Direct
Return12:05HAN → BKK14:052h · Direct2h · Direct
Outbound18:30DMK20:15HAN1h 45mDirect
Return12:05HAN14:05BKK2hDirect
Operated byThai AirAsiaThai VietJet Air
Thai AirAsiaThai VietJet Air฿5,295
฿5,418-2%
Save ฿123
Thai AirAsiaThai VietJet AirRoundtrip total฿5,295฿5,418−2%Save ฿123View deal
One-way deals
31 fares · from ฿2,599
Outbound fare only — add a return separately if you need one.
Trip datesFlight itineraryTotal fareView
mon · Nov 30One way
Departuremon · Nov 30
One way2026
09:55DMK → HAN11:501h 55m · Direct
Outbound09:55DMK11:50HAN1h 55mDirect
Operated byThai AirAsia
Thai AirAsia฿2,599
฿2,744-5%
฿145 below average
Thai AirAsiaOne-way fare฿2,599฿2,744−5%Save ฿145View deal
Lowest 10% in next 365 days
tue · Dec 1One way
Departuretue · Dec 1
One way2026
18:30DMK → HAN20:151h 45m · Direct
Outbound18:30DMK20:15HAN1h 45mDirect
Operated byThai AirAsia
Thai AirAsia฿2,682
฿2,744-2%
฿62 below average
Thai AirAsiaOne-way fare฿2,682฿2,744−2%Save ฿62View deal
Cheapest of December 2026
wed · Dec 2One way
Departurewed · Dec 2
One way2026
09:55DMK → HAN11:501h 55m · Direct
Outbound09:55DMK11:50HAN1h 55mDirect
Operated byThai AirAsia
Thai AirAsia฿2,682
฿2,744-2%
฿62 below average
Thai AirAsiaOne-way fare฿2,682฿2,744−2%Save ฿62View deal
Cheapest of December 2026
tue · Dec 8One way
Departuretue · Dec 8
One way2026
06:55DMK → HAN08:451h 50m · Direct
Outbound06:55DMK08:45HAN1h 50mDirect
Operated byThai AirAsia
Thai AirAsia฿2,699
฿2,744-2%
฿45 below average
Thai AirAsiaOne-way fare฿2,699฿2,744−2%Save ฿45View deal
Lowest 10% of December 2026
sun · Dec 20One way
Departuresun · Dec 20
One way2026
14:05BKK → HAN16:052h · Direct
Outbound14:05BKK16:05HAN2hDirect
Operated byVietravel Airlines
Vietravel Airlines฿2,870
Vietravel AirlinesCurrent fare
One-way fare฿2,870Current fareView deal
tue · Dec 29One way
Departuretue · Dec 29
One way2026
14:05BKK → HAN16:052h · Direct
Outbound14:05BKK16:05HAN2hDirect
Operated byVietravel Airlines
Vietravel Airlines฿2,870
Vietravel AirlinesCurrent fare
One-way fare฿2,870Current fareView deal
fri · Dec 11One way
Departurefri · Dec 11
One way2026
09:25BKK → HAN11:151h 50m · Direct
Outbound09:25BKK11:15HAN1h 50mDirect
Operated byThai VietJet Air
Thai VietJet Air฿2,920
Thai VietJet AirCurrent fare
One-way fare฿2,920Current fareView deal
thu · Dec 3One way
Departurethu · Dec 3
One way2026
14:05BKK → HAN16:052h · Direct
Outbound14:05BKK16:05HAN2hDirect
Operated byVietravel Airlines
Vietravel Airlines฿2,929
Vietravel AirlinesCurrent fare
One-way fare฿2,929Current fareView deal
2 seats left
wed · Dec 9One way
Departurewed · Dec 9
One way2026
14:05BKK → HAN16:052h · Direct
Outbound14:05BKK16:05HAN2hDirect
Operated byVietravel Airlines
Vietravel Airlines฿2,929
Vietravel AirlinesCurrent fare
One-way fare฿2,929Current fareView deal
3 seats left
mon · Dec 14One way
Departuremon · Dec 14
One way2026
13:30BKK → HAN15:001h 30m · Direct
Outbound13:30BKK15:00HAN1h 30mDirect
Operated by
Ethiopian Airlines
Ethiopian Airlines฿2,959
Ethiopian AirlinesCurrent fare
One-way fare฿2,959Current fareView deal
wed · Dec 23One way
Departurewed · Dec 23
One way2026
13:30BKK → HAN15:001h 30m · Direct
Outbound13:30BKK15:00HAN1h 30mDirect
Operated byEthiopian Airlines
Ethiopian Airlines฿2,959
Ethiopian AirlinesCurrent fare
One-way fare฿2,959Current fareView deal
sun · Dec 13One way
Departuresun · Dec 13
One way2026
09:25BKK → HAN11:151h 50m · Direct
Outbound09:25BKK11:15HAN1h 50mDirect
Operated byThai VietJet Air
Thai VietJet Air฿2,979
Thai VietJet AirCurrent fare
One-way fare฿2,979Current fareView deal
fri · Dec 18One way
Departurefri · Dec 18
One way2026
14:05BKK → HAN16:052h · Direct
Outbound14:05BKK16:05HAN2hDirect
Operated byVietravel Airlines
Vietravel Airlines฿2,983
Vietravel AirlinesCurrent fare
One-way fare฿2,983Current fareView deal
mon · Dec 21One way
Departuremon · Dec 21
One way2026
14:05BKK → HAN16:052h · Direct
Outbound14:05BKK16:05HAN2hDirect
Operated byVietravel Airlines
Vietravel Airlines฿2,983
Vietravel AirlinesCurrent fare
One-way fare฿2,983Current fareView deal
sat · Dec 12One way
Departuresat · Dec 12
One way2026
14:05BKK → HAN16:052h · Direct
Outbound14:05BKK16:05HAN2hDirect
Operated byVietravel Airlines
Vietravel Airlines฿2,983
Vietravel AirlinesCurrent fare
One-way fare฿2,983Current fareView deal
sat · Dec 19One way
Departuresat · Dec 19
One way2026
14:05BKK → HAN16:052h · Direct
Outbound14:05BKK16:05HAN2hDirect
Operated byVietravel Airlines
Vietravel Airlines฿2,983
Vietravel AirlinesCurrent fare
One-way fare฿2,983Current fareView deal
sun · Dec 27One way
Departuresun · Dec 27
One way2026
14:05BKK → HAN16:052h · Direct
Outbound14:05BKK16:05HAN2hDirect
Operated byVietravel Airlines
Vietravel Airlines฿2,983
Vietravel AirlinesCurrent fare
One-way fare฿2,983Current fareView deal
5 seats left
thu · Dec 17One way
Departurethu · Dec 17
One way2026
14:05BKK → HAN16:052h · Direct
Outbound14:05BKK16:05HAN2hDirect
Operated byVietravel Airlines
Vietravel Airlines฿2,983
Vietravel AirlinesCurrent fare
One-way fare฿2,983Current fareView deal
tue · Dec 22One way
Departuretue · Dec 22
One way2026
09:25BKK → HAN11:151h 50m · Direct
Outbound09:25BKK11:15HAN1h 50mDirect
Operated byThai VietJet Air
Thai VietJet Air฿2,988
Thai VietJet AirCurrent fare
One-way fare฿2,988Current fareView deal
wed · Dec 30One way
Departurewed · Dec 30
One way2026
14:05BKK → HAN16:052h · Direct
Outbound14:05BKK16:05HAN2hDirect
Operated byVietravel Airlines
Vietravel Airlines฿2,998
Vietravel AirlinesCurrent fare
One-way fare฿2,998Current fareView deal
Plan with confidence
Find the trip that fits
Compare prices, dates, airlines and travel time. Then choose the deal that feels right.
See the difference
December 2026 at a glance
Compare price, non-stop choice and travel time with other Hanoi options.
Non-stop options
100%+0 points compared with other flights
Typical flight time
2h0h 10m longer than the comparison
Roundtrip options
612Trips ready to compare
Typical prices
What do Hanoi roundtrips usually cost?
This distribution uses roundtrip prices only; one-way prices remain in their own labeled summary.
Lowest฿5,169
Typical low฿5,544
Typical฿5,681
Typical high฿5,798
Flexible dates
Cheapest departure dates for Hanoi
Compare nearby dates to see where the better prices are. Always check the final price before booking.
฿5,381
Dec 1
฿5,377
Dec 2
฿5,482
Dec 3
฿6,202
Dec 4
฿5,782
Dec 5
฿5,701
Dec 6
฿6,187
Dec 7
฿5,392
Dec 8
฿5,684
Dec 9
฿5,804
Dec 10
฿5,425
Dec 11
฿5,609
Dec 12
฿5,484
Dec 13
฿5,702
Dec 14
฿5,837
Dec 15
฿5,653
Dec 16
฿5,647
Dec 17
฿5,609
Dec 18
฿5,603
Dec 19
฿5,528
Dec 20
฿5,647
Dec 21
฿5,720
Dec 22
฿5,688
Dec 23
฿5,932
Dec 24
฿5,778
Dec 25
฿5,778
Dec 26
฿5,524
Dec 27
฿5,778
Dec 28
฿5,528
Dec 29
฿5,663
Dec 30
฿5,846
Dec 31
Flexible timing
Compare Hanoi by travel month
Open a month to compare its dates, prices and available flights.
Airline comparison
Which airlines show the lowest Hanoi fares?
Some trips combine airlines, so check both flights before you book.
| Comparison | Lowest | Typical range | Results | Non-stop |
|---|---|---|---|---|
| 1Thai VietJet Air | ฿5,169 | ฿5,484–฿5,773 | 323 | 100% |
| 2Thai AirAsia | ฿5,174 | ฿5,395–฿5,764 | 137 | 100% |
| 3Vietravel Airlines | ฿5,301 | ฿5,615–฿5,837 | 319 | 100% |
| 4VietJet Air | ฿5,390 | ฿5,609–฿5,855 | 193 | 100% |
| 5Ethiopian Airlines | ฿5,632 | ฿5,672–฿5,711 | 37 | 100% |
| 6Vietnam Airlines | ฿5,748 | ฿5,815–฿5,911 | 62 | 100% |
Weather through the year
Typical temperatures in Hanoi
Usual monthly temperatures can help you choose when to go. They are not a live forecast.
27°Jan
28°Feb
29°Mar
30°Apr
30°May
29°Jun
29°Jul
29°Aug
28°Sep
27°Oct
27°Nov
26°Dec
Useful trip facts
What to know about Hanoi
- Country
- Vietnam
- Arrival code
- HAN
- Local-cost group
- 1 / 5
- A broad comparison, separate from airfare
- Typical annual temperature
- 28°C
- Usual temperature, not a forecast
- Trip styles
- City, Shopping
- Bangkok departure airports
- BKK, DMK
- Airports represented in the current fare results
- Arrival airports
- HAN
- Airports represented in the current fare results
- Typical outbound from Bangkok
- 2h
- Typical stay
- 12 nights
Why go
Why travelers consider Hanoi
City of Lakes. A thousand-year-old capital of colonial architecture, street food, and kinetic energy.
Explore related searches
Common questions about Hanoi
What is the lowest available one-way fare for Hanoi?
The lowest available one-way fare is ฿2,682. It is compared only with other one-way fares.
What is the lowest available roundtrip fare for Hanoi?
The lowest available roundtrip fare is ฿5,169. Check the dates, baggage and final total before booking.
What is a typical fare for Hanoi?
A typical fare is ฿5,681. Many available options sit between ฿5,544 and ฿5,798.
How many choices are available for Hanoi?
Choose from 612 roundtrip flights across 1 destination in 1 country.
Are direct flights available for Hanoi?
612 roundtrip flights are non-stop both ways. That is 100% of the current choices.
Which month has the lowest fares for Hanoi?
Dec 2026 has the lowest available roundtrip fare, from ฿5,169.
What is the cheapest flight from Bangkok to Hanoi?
The lowest currently observed flight from Bangkok to Hanoi is ฿5,169. Confirm the final itinerary total and availability before booking.
When is the best time to fly from Bangkok to Hanoi?
Based on current prices, December 2026 offers some of the best deals from Bangkok to Hanoi. Check the month-by-month breakdown on this page for the cheapest times to fly.