Cheap Flight Tickets from Ontario (ONT) to Washington (IAD), Starting at $176

Good to Know: Cheapest and Fastest ONT - IAD Flights

Useful information for finding best airline tickets from Ontario International to Washington Dulles International on your next trip.

Cheapest Round Trip Flight

$176

AA American Airlines • 1 stop • 10h 59m

Sep 18 – Sep 28

The cheapest round trip flight from Ontario to Washington (ONT-IAD-ONT) is currently $176

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Fastest Flight

10h 59m

The fastest nonstop flight from Ontario to Washington (ONT-IAD) takes 10h 59m

Top Airlines Flying from Ontario to Washington

Delta Airline, DL

Delta Airlines

American Airlines, AA

American Airlines

Alaska Airlines -AS

Alaska Airlines

Latest Flight Deals from Ontario (ONT) to Washington (IAD)

Compare and book low fare round-trip air tickets from Ontario to Washington. Ideal for travelers with confirmed return itineraries.

Sep 18 - Sep 28, Economy
AA
Ontario → Washington
10h 59m
10:25 AM - 8:24 PM • 1 stop
AA
Ontario → Washington
11h 44m
12:30 PM - 4:34 PM • 1 stop
$176
American Airlines
Sep 18 - Sep 28, Economy
DL
Ontario → Washington
15h 3m
10:00 PM - 10:03 AM • 1 stop
DL
Ontario → Washington
17h 38m
7:25 AM - 3:23 PM • 1 stop
$260
Delta Airlines
Sep 18 - Sep 28, Economy
DL
Ontario → Washington
12h 19m
1:04 PM - 11:43 PM • 1 stop
DL
Ontario → Washington
16h 54m
5:12 PM - 12:26 AM • 1 stop
$260
Delta Airlines
Sep 18 - Sep 28, Economy
AS
Ontario → Washington
18h 46m
3:14 PM - 5:40 AM • 1 stop
AS
Ontario → Washington
19h 17m
7:00 AM - 3:57 PM • 1 stop
$282
Alaska Airlines
Sep 18 - Sep 28, Economy
AS
Ontario → Washington
14h 7m
12:12 PM - 11:59 PM • 1 stop
AS
Ontario → Washington
17h 24m
7:00 AM - 2:44 PM • 1 stop
$282
Alaska Airlines
Sep 18 - Sep 28, Economy
AS
Ontario → Washington
14h 7m
12:12 PM - 11:59 PM • 1 stop
AS
Ontario → Washington
26h 45m
7:00 AM - 8:05 PM • 2 stops
$351
Alaska Airlines

Fly from Ontario to Washington with the Best Airfare Deals on FareLeaders

Looking for a cheap last-minute deal or the best round-trip flight from Ontario to Washington? Find the biggest savings on one-way and round-trip tickets right here.

FAQs on Ontario to Washington Flights

What are the airports in Ontario?
ONT
What’s the most popular airline flying from ONT to IAD?
The most popular airline flying from Ontario to Washington are
Can I fly from ONT to IAD non-stop?
NO
Which airlines fly nonstop between Ontario and Washington?
The non-stop flights between Ontario and Washington are .
What’s the earliest departure time from ONT to IAD Airport?
The earliest flight leaves ONT at 10:25 am and lands in IAD - Washington Dulles International
What are the airports in Washington?
IAD,BWI,DCA
Can I make changes to my Ontario to Washington flight tickets or cancel them on FareLeaders.com?
No. We are an airfare comparison site. All the tickets are booked by the travel agent offering the flight deal and any changes or cancellations to be made are directly done directly by them or the airlines.
Can I cancel my flight tickets from ONT to IAD?
Read the fare rules of the Ontario to Washington air tickets booked. Some airlines allow you to cancel the tickets within a stipulated time period with a cancellation fee.
Which airline alliances offer flights from Ontario and Washington?
operate flights between Ontario and Washington
How long does a flight from Ontario to Washington take?
It takes approximately 5 hour to fly non-stop from ONT to IAD, which is 2241.85 miles by air.
Which airlines provide the cheapest flights from Ontario (ONT) to Washington (IAD) ?
In the past couple of days, the cheapest tickets to IAD from ONT were found on DL : USD 260
Do I need a passport to fly between ONT and IAD?
No
What’s the latest departure time from ONT to IAD ?
The last flight leaves ONT at 10:00 pm

Ontario (ONT) to Washington (IAD): Airport Information

Origin Airport Ontario International , Ontario, US
Destination Airport Washington Dulles International , Washington, US
Distance 2242 miles

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