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Ontario to Bangkok flights in December 2026 from $811 ONT → BKK

Ontario International Airport (ONT) → Suvarnabhumi Airport (BKK)

For departures in December 2026, the cheapest return found recently is $811 with Korean Air, 4 Dec – 14 Dec, found 2 days ago.

Return

In December 2026, the cheapest return fare on each of 11 departure dates is usually $1,192 to $1,806. Across all 28 departure dates we hold on this route, it is usually $818 to $1,545. Of the 4 months with enough return fares to compare, December 2026 is usually the most expensive.

Cheapest return found recently

$811

4 Dec – 14 Dec · Korean Air

Ontario International Airport (ONT) → Suvarnabhumi Airport (BKK)

out 2 stops, back 1 stop

found 2 days ago

See prices for these datesCheck today's price

It is also the cheapest return we hold, of any age.

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The cheapest dates in December 2026

DatesFromAirlineStopsFound
4 Dec – 14 Dec$811Korean Airout 2 stops, back 1 stopfound 2 days agoSee prices for these dates
1 Dec – 14 Dec$894Korean Airout 2 stops, back 1 stopfound 5 days agoSee prices for these dates
7 Dec – 21 Dec$1,038Frontier Airlinesout 2 stops, back 3 stopsfound 4 days agoSee prices for these dates
12 Dec – 18 Dec$1,345China Airlinesout 1 stop, back 1 stopfound 3 days agoSee prices for these dates
29 Dec – 6 Jan 2027$1,562China Airlinesout 1 stop, back 2 stopsfound 6 days agoSee prices for these dates

Every date we hold

11 departure dates

1 Dec – 14 Dec: $894, found 5 days ago4 Dec – 14 Dec: $811, found 2 days ago7 Dec – 21 Dec: $1,038, found 4 days ago12 Dec – 18 Dec: $1,345, found 3 days ago23 Dec – 8 Jan 2027: $1,830, found 6 days ago24 Dec – 8 Jan 2027: $1,782, found 6 days ago25 Dec – 10 Jan 2027: $1,856, found 6 days ago26 Dec – 7 Jan 2027: $2,095, found 6 days ago27 Dec – 8 Jan 2027: $1,683, found 6 days ago28 Dec – 7 Jan 2027: $1,725, found 6 days ago29 Dec – 6 Jan 2027: $1,562, found 6 days agoDec
See the chart as a table
The cheapest price seen for each departure date — per traveler in Economy.
DatesFromAirlineAirportsStopsFound
1 Dec – 14 Dec$894Korean AirOntario International Airport (ONT) → Suvarnabhumi Airport (BKK)out 2 stops, back 1 stopfound 5 days agoSee prices for these dates
4 Dec – 14 Dec$811Korean AirOntario International Airport (ONT) → Suvarnabhumi Airport (BKK)out 2 stops, back 1 stopfound 2 days agoSee prices for these dates
7 Dec – 21 Dec$1,038Frontier AirlinesOntario International Airport (ONT) → Suvarnabhumi Airport (BKK)out 2 stops, back 3 stopsfound 4 days agoSee prices for these dates
12 Dec – 18 Dec$1,345China AirlinesOntario International Airport (ONT) → Suvarnabhumi Airport (BKK)out 1 stop, back 1 stopfound 3 days agoSee prices for these dates
23 Dec – 8 Jan 2027$1,830STARLUX AirlinesOntario International Airport (ONT) → Suvarnabhumi Airport (BKK)out 1 stop, back 1 stopfound 6 days agoSee prices for these dates
24 Dec – 8 Jan 2027$1,782China AirlinesOntario International Airport (ONT) → Suvarnabhumi Airport (BKK)out 1 stop, back 2 stopsfound 6 days agoSee prices for these dates
25 Dec – 10 Jan 2027$1,856China AirlinesOntario International Airport (ONT) → Suvarnabhumi Airport (BKK)out 1 stop, back 1 stopfound 6 days agoSee prices for these dates
26 Dec – 7 Jan 2027$2,095China AirlinesOntario International Airport (ONT) → Suvarnabhumi Airport (BKK)out 1 stop, back 1 stopfound 6 days agoSee prices for these dates
27 Dec – 8 Jan 2027$1,683China AirlinesOntario International Airport (ONT) → Suvarnabhumi Airport (BKK)out 1 stop, back 1 stopfound 6 days agoSee prices for these dates
28 Dec – 7 Jan 2027$1,725China AirlinesOntario International Airport (ONT) → Suvarnabhumi Airport (BKK)out 1 stop, back 1 stopfound 6 days agoSee prices for these dates
29 Dec – 6 Jan 2027$1,562China AirlinesOntario International Airport (ONT) → Suvarnabhumi Airport (BKK)out 1 stop, back 2 stopsfound 6 days agoSee prices for these dates

Which month looks cheapest?

February 2027 is the cheapest month — from $754.

November 2026From $1,0492 departure dates23 Nov – 1 Dec · found 3 days agoSee prices for these dates
December 2026From $81111 departure dates4 Dec – 14 Dec · found 2 days agoSee prices for these dates
January 2027From $8125 departure dates31 Jan 2027 – 24 Feb 2027 · found 5 days agoSee prices for these dates
February 2027From $754Cheapest seen5 departure dates10 Feb 2027 – 21 Feb 2027 · found 4 days agoSee prices for these dates
March 2027From $8123 departure dates14 Mar 2027 – 22 Mar 2027 · found 6 days agoSee prices for these dates
April 2027From $9511 departure date4 Apr 2027 – 15 Apr 2027 · found 4 days agoSee prices for these dates
July 2027From $1,1201 departure date15 Jul 2027 – 29 Jul 2027 · found 4 days agoSee prices for these dates

Prices are what travelers' searches on Aviasales found in the last 7 days, in US dollars: the price the seller showed on Aviasales; bags may cost extra. Fares change, so check today's price before you book. How our prices work