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Ontario to Miami flights in December 2026 from $131 ONT → MIA

Ontario International Airport (ONT) → Miami International Airport (MIA)

For departures in December 2026, the cheapest return found recently is $323 with Frontier Airlines, 3 Dec – 14 Dec, found yesterday. The cheapest one-way found recently is $131 with Frontier Airlines, 12 Dec, found 2 days ago.

Return

In December 2026, the cheapest return fare on each of 8 departure dates is usually $351 to $432. Across all 17 departure dates we hold on this route, it is usually $377 to $489. Of the 2 months with enough return fares to compare, December 2026 is usually the cheapest.

Cheapest return found recently

$323

3 Dec – 14 Dec · Frontier Airlines

Ontario International Airport (ONT) → Miami International Airport (MIA)

out 1 stop, back 1 stop

found yesterday

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
3 Dec – 14 Dec$323Frontier Airlinesout 1 stop, back 1 stopfound yesterdaySee prices for these dates
15 Dec – 19 Dec$349Frontier Airlinesout 1 stop, back 1 stopfound 5 days agoSee prices for these dates
21 Dec – 24 Dec$351Frontier Airlinesout 1 stop, back 1 stopfound 2 days agoSee prices for these dates
29 Dec – 5 Jan 2027$377Frontier Airlinesout 1 stop, back 2 stopsfound 8 days agoSee prices for these dates
30 Dec – 6 Jan 2027$388Frontier Airlinesout 1 stop, back 1 stopfound 5 days agoSee prices for these dates

Every date we hold

8 departure dates

3 Dec – 14 Dec: $323, found yesterday15 Dec – 19 Dec: $349, found 5 days ago18 Dec – 25 Dec: $487, found 5 days ago20 Dec – 22 Dec: $413, found 2 days ago21 Dec – 24 Dec: $351, found 2 days ago23 Dec – 27 Dec: $545, found 6 days ago29 Dec – 5 Jan 2027: $377, found 8 days ago30 Dec – 6 Jan 2027: $388, found 5 days agoDec
See the chart as a table
The cheapest price seen for each departure date — per traveler in Economy.
DatesFromAirlineAirportsStopsFound
3 Dec – 14 Dec$323Frontier AirlinesOntario International Airport (ONT) → Miami International Airport (MIA)out 1 stop, back 1 stopfound yesterdaySee prices for these dates
15 Dec – 19 Dec$349Frontier AirlinesOntario International Airport (ONT) → Miami International Airport (MIA)out 1 stop, back 1 stopfound 5 days agoSee prices for these dates
18 Dec – 25 Dec$487Frontier AirlinesOntario International Airport (ONT) → Miami International Airport (MIA)out 1 stop, back 1 stopfound 5 days agoSee prices for these dates
20 Dec – 22 Dec$413Frontier AirlinesOntario International Airport (ONT) → Miami International Airport (MIA)out 1 stop, back 1 stopfound 2 days agoSee prices for these dates
21 Dec – 24 Dec$351Frontier AirlinesOntario International Airport (ONT) → Miami International Airport (MIA)out 1 stop, back 1 stopfound 2 days agoSee prices for these dates
23 Dec – 27 Dec$545Frontier AirlinesOntario International Airport (ONT) → Miami International Airport (MIA)out 1 stop, back 1 stopfound 6 days agoSee prices for these dates
29 Dec – 5 Jan 2027$377Frontier AirlinesOntario International Airport (ONT) → Miami International Airport (MIA)out 1 stop, back 2 stopsfound 8 days agoSee prices for these dates
30 Dec – 6 Jan 2027$388Frontier AirlinesOntario International Airport (ONT) → Miami International Airport (MIA)out 1 stop, back 1 stopfound 5 days agoSee prices for these dates

Which month looks cheapest?

December 2026 is the cheapest month — from $323.

November 2026From $3736 departure dates16 Nov – 23 Nov · found 4 days agoSee prices for these dates
December 2026From $323Cheapest seen8 departure dates3 Dec – 14 Dec · found yesterdaySee prices for these dates
March 2027From $5532 departure dates25 Mar 2027 – 30 Mar 2027 · found 7 days agoSee prices for these dates
September 2027From $6521 departure date6 Sept 2027 – 19 Sept 2027 · found 5 days agoSee prices for these dates

One-way

We hold one-way fares on only 1 departure date in December 2026, too few to say what one usually costs.

Cheapest one-way found recently

$131

12 Dec · Frontier Airlines

Ontario International Airport (ONT) → Miami International Airport (MIA)

2 stops

found 2 days ago

Open this tripCheck today's price

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

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

The cheapest dates in December 2026

DatesFromAirlineStopsFound
12 Dec$131Frontier Airlines2 stopsfound 2 days agoOpen this trip

Every date we hold

1 departure date

See every date as a table
The cheapest price seen for each departure date — per traveler in Economy.
DatesFromAirlineAirportsStopsFound
12 Dec$131Frontier AirlinesOntario International Airport (ONT) → Miami International Airport (MIA)2 stopsfound 2 days agoOpen this trip

Which month looks cheapest?

December 2026 is the cheapest month — from $131.

December 2026From $131Cheapest seen1 departure date12 Dec · found 2 days agoOpen this trip
January 2027From $1434 departure dates8 Jan 2027 · found 3 days agoOpen this trip
February 2027From $2152 departure dates19 Feb 2027 · found 4 days agoOpen this trip
March 2027From $3111 departure date27 Mar 2027 · found 8 days agoSee prices for these dates
May 2027From $3261 departure date3 May 2027 · found 3 days agoOpen this trip
June 2027From $2451 departure date12 Jun 2027 · found 3 days agoOpen this trip
July 2027From $2431 departure date27 Jul 2027 · found 2 days agoOpen this trip
September 2027From $3241 departure date16 Sept 2027 · found 5 days agoOpen this trip

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