Cheap flights from Ontario to Boston

One-way fares from $191 · ONT → BOS · prices found by travellers in the last 48 hours

Compare all dates Boston → Ontario
Cheapest fare
$191

Southwest Airlines · Mon, Jan 4

Cheapest month
January

from $191

Direct flights
Not recently

Usually 1+ stop

Quickest trip
6h 03m

4,120 km

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Cheapest month to fly from Ontario to Boston

Lowest one-way fare per person in each month. Choose a month to see every date.

  1. November 2026 $265
  2. December 2026 $209
  3. January 2027 Cheapest $191
  4. March 2027 $228
  5. April 2027 $208

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About flights from Ontario to Boston

Ontario (ONT) and Boston (BOS) are about 4,120 km apart. We haven't seen direct fares on this route recently, so expect at least one stop; the quickest journey we've seen takes about 6h 03m. Over the next few months, one-way fares start from $191, and January 2027 is currently the cheapest month to fly.

These prices come from searches travellers made in the last 48 hours, so they move quickly. If you see a good fare, it's worth booking soon. FlightsExp is free to use: you book directly with our travel partner.

Frequently asked questions

How much is a flight from Ontario to Boston?

The cheapest one-way fare we've seen recently is $191 with Southwest Airlines, departing Monday, January 4, 2027. Over the coming months, the lowest fare in each month ranges from $191 to $265.

What is the cheapest month to fly from Ontario to Boston?

January 2027 currently has the lowest fares, from $191 one way.

Are there direct flights from Ontario to Boston?

We haven't seen direct fares recently, so most journeys include at least one stop.

How long is the flight from Ontario to Boston?

The quickest journey we've seen takes about 6h 03m. Ontario and Boston are around 4,120 km apart.

Which airlines fly from Ontario to Boston?

Recent fares on this route were with Southwest Airlines, American Airlines and Alaska Airlines.

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