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Ontario to Bangkok ONT → BKK

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

The cheapest return found recently is $866 with United Airlines, 13 Jan 2027 – 28 Jan 2027, found 2 days ago. The cheapest one-way found recently is $382 with Korean Air, 13 Jan 2027, found yesterday.

Return

The cheapest return fare on each of 14 departure dates is usually $945 to $1,787.

Cheapest return found recently

$866

13 Jan 2027 – 28 Jan 2027 · United Airlines

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

Leaves 7:25 a.m. · Return leaves 7:10 a.m. · 46 h 20 min of travel, both ways together

out 2 stops, back 1 stop

found 2 days ago

See prices for these datesCheck today's price

Cheapest nonstop return

None seen yet.

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Found recently, and the cheapest we hold

Cheapest found recently $866 13 Jan 2027 – 28 Jan 2027found 2 days agoSee prices for these dates

Cheapest we hold, of any age $742 6 Mar 2027 – 22 Mar 2027found 3 days agoSee prices for these dates

What have prices looked like?

Over 25 days, 24 Sept to 18 Oct, the cheapest return we saw each day was $643 to $773.

At $866, the cheapest return found recently is above that range.

25 days is a short history, so treat this range as an early guide.

Those were the prices on those days, not today's.

Is this a good return price?

Compared with the cheapest return fare on each of 14 departure dates from 7 Nov to 6 Mar 2027, found by travelers' searches in the last 7 days (economy, the price the seller showed on Aviasales). The usual range is the middle half of those prices.

Could nearby dates be cheaper?

We hold no other 15-night return fares leaving within 3 days of 13 Jan 2027 to compare.

Every date we hold

17 fares on 14 departure dates

7 Nov – 28 Nov: $1,245, found 3 days ago8 Nov – 15 Nov: $1,000, found 2 days ago16 Nov – 23 Nov: $1,228, found 6 days ago21 Nov – 19 Dec: $926, found 6 days ago21 Dec – 8 Jan 2027: $2,116, found 5 days ago26 Dec – 10 Jan 2027: $2,263, found 5 days ago31 Dec – 8 Jan 2027: $1,925, found 2 days ago1 Jan 2027 – 9 Jan 2027: $2,067, found 2 days ago2 Jan 2027 – 15 Jan 2027: $1,024, found 6 days ago3 Jan 2027 – 11 Jan 2027: $1,374, found 2 days ago4 Jan 2027 – 12 Jan 2027: $1,199, found 2 days ago6 Jan 2027 – 14 Jan 2027: $888, found 2 days ago13 Jan 2027 – 28 Jan 2027: $866, found 2 days ago6 Mar 2027 – 22 Mar 2027: $742, found 3 days agoNovDecJanMar
See the chart as a table
The cheapest price seen for each departure date — per traveler in Economy.
DatesFromAirlineAirportsStopsFound
7 Nov – 28 Nov$1,245STARLUX AirlinesOntario International Airport (ONT) → Suvarnabhumi Airport (BKK)out 1 stop, back 1 stopfound 3 days agoSee prices for these dates
8 Nov – 15 Nov$1,000China AirlinesOntario International Airport (ONT) → Suvarnabhumi Airport (BKK)out 1 stop, back 1 stopfound 2 days agoSee prices for these dates
16 Nov – 23 Nov$1,228STARLUX AirlinesOntario International Airport (ONT) → Suvarnabhumi Airport (BKK)out 1 stop, back 1 stopfound 6 days agoSee prices for these dates
21 Nov – 19 Dec$926United AirlinesOntario International Airport (ONT) → Suvarnabhumi Airport (BKK)out 2 stops, back 1 stopfound 6 days agoSee prices for these dates
21 Dec – 8 Jan 2027$2,116China AirlinesOntario International Airport (ONT) → Suvarnabhumi Airport (BKK)out 1 stop, back 1 stopfound 5 days agoSee prices for these dates
26 Dec – 10 Jan 2027$2,263China AirlinesOntario International Airport (ONT) → Suvarnabhumi Airport (BKK)out 1 stop, back 1 stopfound 5 days agoSee prices for these dates
31 Dec – 8 Jan 2027$1,925China AirlinesOntario International Airport (ONT) → Suvarnabhumi Airport (BKK)out 1 stop, back 1 stopfound 2 days agoSee prices for these dates
1 Jan 2027 – 9 Jan 2027$2,067China AirlinesOntario International Airport (ONT) → Suvarnabhumi Airport (BKK)out 1 stop, back 1 stopfound 2 days agoSee prices for these dates
2 Jan 2027 – 15 Jan 2027$1,024STARLUX AirlinesOntario International Airport (ONT) → Suvarnabhumi Airport (BKK)out 1 stop, back 1 stopfound 6 days agoSee prices for these dates
3 Jan 2027 – 11 Jan 2027$1,374China AirlinesOntario International Airport (ONT) → Suvarnabhumi Airport (BKK)out 1 stop, back 1 stopfound 2 days agoSee prices for these dates
4 Jan 2027 – 12 Jan 2027$1,199China AirlinesOntario International Airport (ONT) → Suvarnabhumi Airport (BKK)out 1 stop, back 1 stopfound 2 days agoSee prices for these dates
6 Jan 2027 – 14 Jan 2027$888United AirlinesOntario International Airport (ONT) → Suvarnabhumi Airport (BKK)out 2 stops, back 1 stopfound 2 days agoSee prices for these dates
13 Jan 2027 – 28 Jan 2027$866United AirlinesOntario International Airport (ONT) → Suvarnabhumi Airport (BKK)out 2 stops, back 1 stopfound 2 days agoSee prices for these dates
6 Mar 2027 – 22 Mar 2027$742Korean AirOntario International Airport (ONT) → Suvarnabhumi Airport (BKK)out 2 stops, back 1 stopfound 3 days agoSee prices for these dates

Which month looks cheapest?

March 2027 is the cheapest month — from $742.

November 2026From $9264 departure dates21 Nov – 19 Dec · found 6 days agoSee prices for these dates
December 2026From $1,9253 departure dates31 Dec – 8 Jan 2027 · found 2 days agoSee prices for these dates
January 2027From $8666 departure dates13 Jan 2027 – 28 Jan 2027 · found 2 days agoSee prices for these dates
March 2027From $742Cheapest seen1 departure date6 Mar 2027 – 22 Mar 2027 · found 3 days agoSee prices for these dates

Airlines on the cheapest dates: China Airlines, STARLUX Airlines, United Airlines, Korean Air.

One-way

The cheapest one-way fare on each of 3 departure dates is usually $398 to $436.

Cheapest one-way found recently

$382

13 Jan 2027 · Korean Air

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

Leaves 3:30 p.m. · 30 h 55 min trip

2 stops

found yesterday

Open this tripCheck today's price

Cheapest nonstop one-way

None seen yet.

FareTell may earn a commission when you book through a partner.

Found recently, and the cheapest we hold

Cheapest found recently $382 13 Jan 2027found yesterdayOpen this trip

It is also the cheapest one-way we hold, of any age.

What have prices looked like?

Over 21 days, 24 Sept to 18 Oct, the cheapest one-way we saw each day was $361 to $547.

$382, the cheapest one-way found recently, sits here in that range of $361 to $547.

21 days is a short history, so treat this range as an early guide.

Those were the prices on those days, not today's.

Is this a good one-way price?

Compared with the cheapest one-way fare on each of 3 departure dates from 13 Jan 2027 to 7 Apr 2027, found by travelers' searches in the last 7 days (economy, the price the seller showed on Aviasales). The usual range is the middle half of those prices.

Could nearby dates be cheaper?

We hold no other one-way fares leaving within 3 days of 13 Jan 2027 to compare.

Every date we hold

4 fares on 3 departure dates

13 Jan 2027: $382, found yesterday5 Feb 2027: $459, found 4 days ago7 Apr 2027: $413, found 6 days agoJanFebApr
See the chart as a table
The cheapest price seen for each departure date — per traveler in Economy.
DatesFromAirlineAirportsStopsFound
13 Jan 2027$382Korean AirOntario International Airport (ONT) → Suvarnabhumi Airport (BKK)2 stopsfound yesterdayOpen this trip
5 Feb 2027$459Korean AirOntario International Airport (ONT) → Suvarnabhumi Airport (BKK)2 stopsfound 4 days agoOpen this trip
7 Apr 2027$413Korean AirOntario International Airport (ONT) → Suvarnabhumi Airport (BKK)2 stopsfound 6 days agoOpen this trip

Which month looks cheapest?

January 2027 is the cheapest month — from $382.

January 2027From $382Cheapest seen1 departure date13 Jan 2027 · found yesterdayOpen this trip
February 2027From $4591 departure date5 Feb 2027 · found 4 days agoOpen this trip
April 2027From $4131 departure date7 Apr 2027 · found 6 days agoOpen this trip

Airlines on the cheapest dates: Korean Air.

Premium cabin fares from Ontario to Bangkok

We hold no premium economy, business or first-class fares for this route: we collect them for the busiest routes, and this one is not among them yet.

Today's prices for 13 Jan 2027 – 28 Jan 2027 in another cabin: Premium economy · Business · First

Today's prices for 13 Jan 2027 in another cabin: Premium economy · Business · First

How far ahead were prices cheapest for Ontario to Bangkok?

Return

Fares 90 to 179 days before departure were typically 14% lower than 0 to 6 days before departure.

From the cheapest return each day between 24 Sept and 18 Oct (25 days), grouped by how many days ahead the flight left; one adult in economy.

Each range covers different departure dates, so this compares typical fares, not the same trip priced twice.

Prices reflect recent searches — current fares may differ.

See these ranges as a table
Typical price in each booking range — round trip, per traveler in Economy.
Booked ahead byTypical fareCheapest dayAbove the cheapestDays of prices
0–6 days$896$825+17%9
7–13 days$860$857+12%23
14–29 days$883$840+15%25
30–59 days$899$786+17%25
60–89 days$774$643+1%25
90–179 days$767$742Cheapest seen25
180+ days$902$902+18%10

One-way

Not enough history yet: in 21 days of one-way prices, 24 Sept to 18 Oct, fewer than 3 booking ranges had prices on 7 days or more.

Could a nearby airport be cheaper?

A different airport at either end can change the fare — sometimes a lot.

Return

Los Angeles → Bangkok

56 km from Ontario

$1,021

$155 more than flying from Ontario

13 Nov – 22 Nov · SNA → BKK · out 2 stops, back 1 stop

found yesterday

See this route

Cheapest recent price on each route — round trip, per traveler in Economy. Distances are in a straight line.

One-way

Los Angeles → Bangkok

56 km from Ontario

$453

$71 more than flying from Ontario

13 Jan 2027 · SNA → BKK · 2 stops

found yesterday

See this route

Long Beach → Bangkok

60 km from Ontario

$10,592

$10,210 more than flying from Ontario

6 Feb 2027 · LGB → BKK · 2 stops

found 4 days ago

Check today's price

Cheapest recent price on each route — one way, per traveler in Economy. Distances are in a straight line.

Live price for these dates

The cheapest return found recently is for 13 Jan 2027 – 28 Jan 2027. A live search on this page shows what those dates cost now, for one adult in economy.

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