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Cheap flights Washington — Ontario

Washington (WAS, US) Ontario (ONT, US)
from $120 3 640 km ~4h 47m 5 flights found 2 airlines cheapest on Friday
Reverse route
How many travellers?
Adults
12+ years
1
Children
2–11 years
0
Infants
under 2
0
Choose your departure date
Cheapest: $120 on 01.01.2027
Prices shown are from searches by other travellers over the last 24 hours. Missing a date? Click any day — we'll find tickets anyway.
November 2026
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December 2026
Mo
Tu
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January 2027
Mo
Tu
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Prices found for 3 of 90 days. Prices update as more travellers search. Click any date to search live.
Depart
—
Return
—
Cheapest flights found
01 Jan 2027, Fri
Frontier Airlines F9 4277
04:51
IAD Washington Dulles International Airport
11:14
ONT Ontario International Airport
6h 23m 1 stop
Farera
$120
View this ticket
24 Nov 2026, Tue
Frontier Airlines F9 4277
21:09
IAD Washington Dulles International Airport
03:33
ONT Ontario International Airport
6h 24m 1 stop
Trip.com
$156
View this ticket
27 Jan 2027, Wed
Southwest Airlines WN 245
14:10
DCA Ronald Reagan National Airport
21:05
ONT Ontario International Airport
6h 55m 1 stop
Farera
$174
View this ticket
24 Nov 2026, Tue
Southwest Airlines WN 1317
23:10
BWI Baltimore/Wash International Thurgood Marshall Airport
08:00
ONT Ontario International Airport
8h 50m Direct
City.Travel
$366
View this ticket
Route characteristics
Distance
3 640 km
Flight time
4h 47m
Time difference
-3h
Minimum price
from $120 (01.01.2027)
Average price
$150
Maximum price
$174
Cheapest day
Friday
Departure airports (3)
BWI Baltimore/Wash International Thurgood Marshall Airport DCA Ronald Reagan National Airport IAD Washington Dulles International Airport
Arrival airports (1)
ONT Ontario International Airport
Airlines (2)
F9 Frontier Airlines WN Southwest Airlines
Agencies (3)
Farera Trip.com City.Travel
Prices by day of week
Tuesday
$156
avg $261
Wednesday
$174
avg $174
Friday
$120
avg $120
Cheapest
Price trend by month
November 2026
from $156
avg $261
2 flights
January 2027
from $120
avg $147
2 flights
Airlines — cheapest prices 2
Frontier Airlines
Frontier Airlines
Low-cost 3 flights · 3 days
$120
Southwest Airlines
Southwest Airlines
Low-cost 2 flights · 2 days
$174
Where to buy tickets 3
Farera
3 tickets · 3 days
from $120
Trip.com
1 tickets · 1 days
from $156
City.Travel
1 tickets · 1 days
from $366
Airports

From — Washington (3)

  • BWI Baltimore/Wash International Thurgood Marshall Airport
  • DCA Ronald Reagan National Airport
  • IAD Washington Dulles International Airport

To — Ontario (1)

  • ONT Ontario International Airport
Other destinations from Washington
Nashville
US
Dallas
US · Hub
Los Angeles
US · Hub
Miami
US · Hub
Raleigh
US
St Louis
US
Cincinnati
US
Seattle
US
Boston
US
Atlanta
US · Hub
San Juan
PR
Tampa
US
Frequently asked questions about the route Washington — Ontario
How long is the flight from Washington to Ontario?
Approximate flight time — 4h 47m. This is an average for a direct flight. With connections, the time may be longer.
What is the distance from Washington to Ontario?
The straight-line distance — 3 640 km.
How much do flights from Washington to Ontario cost?
The minimum price over 3 months — from $120 on 01.01.2027.
What is the average ticket price?
The average price — $150. Range: $120 — $174.
What is the time difference between Washington and Ontario?
The difference — -3h.
From which airports does Washington operate flights?
From Washington: BWI (Baltimore/Wash International Thurgood Marshall Airport), DCA (Ronald Reagan National Airport), IAD (Washington Dulles International Airport).
To which airports in Ontario do flights arrive?
To Ontario: ONT (Ontario International Airport).
Which airlines fly this route?
This route is served by 2 airlines: Frontier Airlines, Southwest Airlines.
Are there direct flights?
Yes, there are direct flights. Minimum direct price — from $366. Total direct flights found: 1.
Which day of the week is cheapest?
The cheapest day of the week — Friday.
When is the best time to buy tickets?
Optimal — 1–3 months before departure. Check the calendar above — it shows the best dates.
How do I book flights?
Click "View this ticket" on any flight card — you'll be redirected to the booking page with this specific ticket pre-selected.
About the route Washington — Ontario

Flights Washington — Ontario is a popular route. The straight-line distance is 3 640 km. Flight time 4h 47m. Time difference -3h.

From Washington (WAS) flights depart from 3 airports: BWI, DCA, IAD. To Ontario (ONT) — 1 arrival airport: ONT.

2 airlines operate on this route: Frontier Airlines, Southwest Airlines.

The minimum price for the next 3 months — from $120 (01.01.2027). The cheapest dates are highlighted in the calendar above.

The average ticket price — $150, ranging from $120 to $174. Book 1–3 months in advance to get the best deals.

Cheapest day to fly — Friday.

Other destinations in United States from Washington
Nashville
US
Dallas
US
Los Angeles
US
Miami
US
Raleigh
US
St Louis
US
Seattle
US
Boston
US

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