Cheap flights from Washington to Ontario

One-way fares from $122 · WAS → ONT · prices found by travellers in the last 48 hours

Compare all dates Ontario → Washington
Cheapest fare
$122

Frontier Airlines · Thu, Nov 26

Cheapest month
November

from $122

Direct flights
Not recently

Usually 1+ stop

Quickest trip
6h 23m

3,640 km

Get a price alert

We'll email you when Washington → Ontario drops to your price. It's free, and you can stop any time.

Today's cheapest fare is $122. We'll send one email to confirm. See our privacy policy.

Cheapest month to fly from Washington to Ontario

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

  1. November 2026 Cheapest $122
  2. December 2026 $129
  3. January 2027 $160
  4. February 2027 $182

Cheapest dates in November 2026

The lowest fares we've seen for each day, cheapest first.

Frontier Airlines
Depart12:31 Thu, Nov 19IAD → ONT 6h 59m · 1 stop
$122one way, per person
View deal
Frontier Airlines
Depart18:07 Wed, Nov 18IAD → ONT 8h 27m · 2 stops
$169one way, per person
View deal
See every date in November 2026 →

Plan the rest of your trip to Ontario

Where to stay, what to do and getting around, from our travel partners.

Where to stay

Hotels in OntarioCompare places to stay on Booking.com Find hotels →

Things to do

Things to do in OntarioTours, attractions and day trips on Klook Explore →

Getting around

Airport transfer in OntarioPre-book a driver to meet you at arrivals, with Kiwitaxi Book a transfer → Car hire in OntarioCompare rental cars from major brands on EconomyBookings Compare cars →

About flights from Washington to Ontario

Washington (WAS) and Ontario (ONT) are about 3,640 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 23m. Over the next few months, one-way fares start from $122, and November 2026 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 Washington to Ontario?

The cheapest one-way fare we've seen recently is $122 with Frontier Airlines, departing Thursday, November 26, 2026. Over the coming months, the lowest fare in each month ranges from $122 to $182.

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

November 2026 currently has the lowest fares, from $122 one way.

Are there direct flights from Washington to Ontario?

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

How long is the flight from Washington to Ontario?

The quickest journey we've seen takes about 6h 23m. Washington and Ontario are around 3,640 km apart.

Which airlines fly from Washington to Ontario?

Recent fares on this route were with Frontier Airlines.

More cheap flights from Washington

Compare flights to Ontario from other cities →