Cheap Flight Tickets from Ontario (ONT) to Washington (IAD), Starting at $424

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

$603

DL Delta Airlines • 1 stop • 13h 46m

Jul 22 – Jul 26

The cheapest round trip flight from Ontario to Washington (ONT-IAD-ONT) is currently $603

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Fastest Flight

11h 57m

The fastest nonstop flight from Ontario to Washington (ONT-IAD) takes 11h 57m

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.

Jul 22 - Jul 26, Economy
DL
Ontario → Washington
13h 46m
10:00 PM - 9:26 AM • 1 stop
DL
Ontario → Washington
15h 47m
3:45 PM - 10:32 PM • 1 stop
$603
Delta Airlines
Jul 22 - Jul 26, Economy
AS
Ontario → Washington
15h 45m
5:54 PM - 6:39 AM • 1 stop
AS
Ontario → Washington
16h 46m
6:03 AM - 1:09 PM • 1 stop
$761
Alaska Airlines
Jul 22 - Jul 26, Economy
F9
Ontario → Washington
22h 20m
3:40 PM - 8:20 AM • 1 stop
F9
Ontario → Washington
15h 4m
9:50 AM - 3:54 PM • 1 stop
$764
Frontier Airlines
Jul 22 - Jul 26, Economy
F9
Ontario → Washington
25h 42m
1:38 PM - 8:20 AM • 1 stop
F9
Ontario → Washington
15h 4m
9:50 AM - 3:54 PM • 1 stop
$764
Frontier Airlines
Jul 22 - Jul 26, Economy
AS
Ontario → Washington
14h 15m
12:04 PM - 11:59 PM • 1 stop
AS
Ontario → Washington
16h 46m
6:03 AM - 1:09 PM • 1 stop
$882
Alaska Airlines
Jul 22 - Jul 26, Economy
AS
Ontario → Washington
22h 14m
2:05 PM - 6:39 AM • 1 stop
AS
Ontario → Washington
16h 46m
6:03 AM - 1:09 PM • 1 stop
$1254
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 12:00 pm 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 F9 : USD 764
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 11:59 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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