Find Cheap Flights from Ontario to Washington Dulles Intl (ONT - IAD)

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Fri 11/24
Fri 12/1
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Good to Know

Average Price:
$445
(avg. price over the last 2 weeks)
Good Deal:
$317
or less (round trip)

When to Book Flights from Ontario to Washington Dulles Intl

Flight prices as travel date approaches
-1 day
-2 days

Top tips for Finding a Cheap Flight

Looking for a cheap flight? 25% of our users found flights on this route for $316 or less.
The cheapest flight from Ontario to Washington Dulles Intl was found 66 days before departure, on average.
Book at least 1 week before departure in order to get a below-average price.
Morning departure is around 30% cheaper than an evening flight, on average*.
*Average of the lowest prices shown in KAYAK’s search results for departures within the next 30 days

FAQs for Booking Ontario to Washington Dulles Intl Flights

How long does a flight from Ontario to Washington Dulles Intl take?
An average nonstop flight takes 6h 40m, covering a distance of 2238 miles.
Which airlines provide the cheapest flights from Ontario to Washington Dulles Intl?
In the past 3 days, the cheapest round-trip tickets were found on Frontier ($229) and Multiple Airlines ($260)
Do I need a passport to fly between Ontario and Washington Dulles Intl?
No.
What’s the cheapest day of the week to fly Ontario to Washington Dulles Intl?
For Ontario to Washington Dulles Intl, Wednesday is the cheapest day to fly on average and Monday is the most expensive. Flying from Washington Dulles Intl back to Ontario, the best deals are generally found on Wednesday, with Monday being the most expensive.

Book cheap flights from Ontario to Washington Dulles Intl (round-trip)

Airports
Origin
Ontario
$229
only
$229
Destination
Washington
$229
only
$229
Wed, Nov 29
ONT
IAD
6h 40m
Mon, Dec 4
IAD
ONT
7h 55m
Trip: 6 days
5.6OkayShow reviews
Overall 5.6 Okay
Based on 33009 reviews
Overall
5.9
Boarding
6.4
Comfort
5.4
Crew
6.8
Entertainment
4.5
Food
4.7
DEN
ATL
Mediocre 2.0

I did not make the flight due to unclear announcements.

MSY
DEN
Excellent 8.0

Flight was delayed

MSP
DEN
Mediocre 2.0

We didn't make it to Vegas and they barely compensated us.

MCO
DEN
Good 6.0

It was cheap

PVD
MCO
Mediocre 2.0

Seats are hard and uncomfortable. Very small drink tray and lights are not adjustable.

Sun, Dec 17
ONT
IAD
30h 30m
Thu, Jan 18
IAD
ONT
8h 05m
Trip: 33 days
Overall 0.0 Poor
Based on 0 reviews
Fri, Dec 1
ONT
IAD
6h 40m
Sat, Dec 2
IAD
ONT
7h 55m
Trip: 2 days
5.6OkayShow reviews
Overall 5.6 Okay
Based on 33009 reviews
Overall
5.9
Boarding
6.4
Comfort
5.4
Crew
6.8
Entertainment
4.5
Food
4.7
MCO
DEN
Good 6.0

It was cheap

AUS
IAD
Mediocre 2.0

2.5 hours delay is what I didn’t like

MKE
LAS
Okay 5.6

The crew was most friendly and accommodating. Pilots very informative made a could be turbulent flight very smooth.

Seats are very uncomfortable had a bar straight across bottom of my back. Lack of food and beverages. The plane should always be stocked.

PSP
DEN
Mediocre 3.3

My flight crew. Received call concerning my bag in Atlanta, although I was still in Denver.

Long line to check in, anxiety about missing flight Had to pay for my carry on Missed my connecting flight, announcements were not clear Was told I to pay a rebooking fee for a flight two days later Frontier does not offer stand by Spent $285 with another airline to get to Atlanta on time

PVD
MCO
Mediocre 2.0

Seats are hard and uncomfortable. Very small drink tray and lights are not adjustable.

Sat, Dec 2
ONT
IAD
6h 40m
Mon, Dec 4
IAD
ONT
7h 55m
Trip: 3 days
5.6OkayShow reviews
Overall 5.6 Okay
Based on 33009 reviews
Overall
5.9
Boarding
6.4
Comfort
5.4
Crew
6.8
Entertainment
4.5
Food
4.7
DEN
ATL
Mediocre 2.0

I did not make the flight due to unclear announcements.

PHL
PBI
Good 6.3

The plane was clean and we left on time with no delays or issues. The flight crew were very nice and there was also enough overhead space for everyone’s bags.

The lines are excessively long to check a bag, there was only 1 of 4 check in kiosks working, which created it’s own line. Also the carry on bag fee at the airport was incredibly steep.

MSP
DEN
Mediocre 2.0

We didn't make it to Vegas and they barely compensated us.

PSP
DEN
Mediocre 3.3

My flight crew. Received call concerning my bag in Atlanta, although I was still in Denver.

Long line to check in, anxiety about missing flight Had to pay for my carry on Missed my connecting flight, announcements were not clear Was told I to pay a rebooking fee for a flight two days later Frontier does not offer stand by Spent $285 with another airline to get to Atlanta on time

MKE
LAS
Okay 5.6

The crew was most friendly and accommodating. Pilots very informative made a could be turbulent flight very smooth.

Seats are very uncomfortable had a bar straight across bottom of my back. Lack of food and beverages. The plane should always be stocked.

Tue, Jan 9
ONT
IAD
6h 46m
Wed, Jan 10
IAD
ONT
8h 11m
Trip: 2 days
5.6OkayShow reviews
Overall 5.6 Okay
Based on 33009 reviews
Overall
5.9
Boarding
6.4
Comfort
5.4
Crew
6.8
Entertainment
4.5
Food
4.7
MCO
ATL
Okay 5.3

The poor way they handle things when the system goes down

MSY
DEN
Excellent 8.0

Flight was delayed

AUS
IAD
Mediocre 2.0

2.5 hours delay is what I didn’t like

TPA
MKE
Good 6.3

The toilet was broken. Hour delay

PHX
CVG
Good 7.0

I liked that the staff was friendly and the tickets were affordable

I didn’t like that there was no complimentary food or beverage options.

Mon, Dec 25
ONT
IAD
10h 05m
Mon, Jan 1
IAD
ONT
8h 11m
Trip: 8 days
Overall 0.0 Poor
Based on 0 reviews
Fri, Feb 2
ONT
IAD
6h 50m
Sun, Feb 4
IAD
ONT
8h 05m
Trip: 3 days
5.6OkayShow reviews
Overall 5.6 Okay
Based on 33009 reviews
Overall
5.9
Boarding
6.4
Comfort
5.4
Crew
6.8
Entertainment
4.5
Food
4.7
MSP
DEN
Mediocre 2.0

We didn't make it to Vegas and they barely compensated us.

MCO
DEN
Good 6.0

It was cheap

MCO
ATL
Okay 5.3

The poor way they handle things when the system goes down

MKE
LAS
Okay 5.6

The crew was most friendly and accommodating. Pilots very informative made a could be turbulent flight very smooth.

Seats are very uncomfortable had a bar straight across bottom of my back. Lack of food and beverages. The plane should always be stocked.

PHL
PBI
Good 6.3

The plane was clean and we left on time with no delays or issues. The flight crew were very nice and there was also enough overhead space for everyone’s bags.

The lines are excessively long to check a bag, there was only 1 of 4 check in kiosks working, which created it’s own line. Also the carry on bag fee at the airport was incredibly steep.

Sat, Mar 3
ONT
IAD
6h 50m
Tue, Mar 13
IAD
ONT
7h 49m
Trip: 10 days
5.6OkayShow reviews
Overall 5.6 Okay
Based on 33009 reviews
Overall
5.9
Boarding
6.4
Comfort
5.4
Crew
6.8
Entertainment
4.5
Food
4.7
PHX
CVG
Good 7.0

I liked that the staff was friendly and the tickets were affordable

I didn’t like that there was no complimentary food or beverage options.

TPA
MKE
Good 6.3

The toilet was broken. Hour delay

PVD
MCO
Mediocre 2.0

Seats are hard and uncomfortable. Very small drink tray and lights are not adjustable.

PSP
DEN
Mediocre 3.3

My flight crew. Received call concerning my bag in Atlanta, although I was still in Denver.

Long line to check in, anxiety about missing flight Had to pay for my carry on Missed my connecting flight, announcements were not clear Was told I to pay a rebooking fee for a flight two days later Frontier does not offer stand by Spent $285 with another airline to get to Atlanta on time

MSY
DEN
Excellent 8.0

Flight was delayed

Tue, Apr 3
ONT
IAD
6h 52m
Thu, Apr 5
IAD
ONT
7h 49m
Trip: 3 days
5.6OkayShow reviews
Overall 5.6 Okay
Based on 33009 reviews
Overall
5.9
Boarding
6.4
Comfort
5.4
Crew
6.8
Entertainment
4.5
Food
4.7
TPA
MKE
Good 6.3

The toilet was broken. Hour delay

PHX
CVG
Good 7.0

I liked that the staff was friendly and the tickets were affordable

I didn’t like that there was no complimentary food or beverage options.

PVD
MCO
Mediocre 2.0

Seats are hard and uncomfortable. Very small drink tray and lights are not adjustable.

DEN
ATL
Mediocre 2.0

I did not make the flight due to unclear announcements.

MSP
DEN
Mediocre 2.0

We didn't make it to Vegas and they barely compensated us.

Wed, Mar 28
ONT
IAD
6h 50m
Wed, Apr 4
IAD
ONT
7h 40m
Trip: 8 days
5.6OkayShow reviews
Overall 5.6 Okay
Based on 33009 reviews
Overall
5.9
Boarding
6.4
Comfort
5.4
Crew
6.8
Entertainment
4.5
Food
4.7
PVD
MCO
Mediocre 2.0

Seats are hard and uncomfortable. Very small drink tray and lights are not adjustable.

DEN
ATL
Mediocre 2.0

I did not make the flight due to unclear announcements.

MCO
DEN
Good 6.0

It was cheap

PHX
CVG
Good 7.0

I liked that the staff was friendly and the tickets were affordable

I didn’t like that there was no complimentary food or beverage options.

AUS
IAD
Mediocre 2.0

2.5 hours delay is what I didn’t like

Sat, Mar 31
ONT
IAD
6h 50m
Sat, Apr 7
IAD
ONT
7h 40m
Trip: 8 days
5.6OkayShow reviews
Overall 5.6 Okay
Based on 33009 reviews
Overall
5.9
Boarding
6.4
Comfort
5.4
Crew
6.8
Entertainment
4.5
Food
4.7
MCO
ATL
Okay 5.3

The poor way they handle things when the system goes down

MCO
DEN
Good 6.0

It was cheap

DEN
ATL
Mediocre 2.0

I did not make the flight due to unclear announcements.

TPA
MKE
Good 6.3

The toilet was broken. Hour delay

MSP
DEN
Mediocre 2.0

We didn't make it to Vegas and they barely compensated us.

Wed, Nov 29
ONT
IAD
6h 40m
Tue, Dec 5
IAD
ONT
7h 52m
Trip: 7 days
5.6OkayShow reviews
Overall 5.6 Okay
Based on 33009 reviews
Overall
5.9
Boarding
6.4
Comfort
5.4
Crew
6.8
Entertainment
4.5
Food
4.7
AUS
IAD
Mediocre 2.0

2.5 hours delay is what I didn’t like

MCO
DEN
Good 6.0

It was cheap

MSP
DEN
Mediocre 2.0

We didn't make it to Vegas and they barely compensated us.

MKE
LAS
Okay 5.6

The crew was most friendly and accommodating. Pilots very informative made a could be turbulent flight very smooth.

Seats are very uncomfortable had a bar straight across bottom of my back. Lack of food and beverages. The plane should always be stocked.

DEN
ATL
Mediocre 2.0

I did not make the flight due to unclear announcements.

Sat, Mar 24
ONT
IAD
6h 50m
Sat, Mar 31
IAD
ONT
7h 40m
Trip: 8 days
5.6OkayShow reviews
Overall 5.6 Okay
Based on 33009 reviews
Overall
5.9
Boarding
6.4
Comfort
5.4
Crew
6.8
Entertainment
4.5
Food
4.7
PHX
CVG
Good 7.0

I liked that the staff was friendly and the tickets were affordable

I didn’t like that there was no complimentary food or beverage options.

MSP
DEN
Mediocre 2.0

We didn't make it to Vegas and they barely compensated us.

PHL
PBI
Good 6.3

The plane was clean and we left on time with no delays or issues. The flight crew were very nice and there was also enough overhead space for everyone’s bags.

The lines are excessively long to check a bag, there was only 1 of 4 check in kiosks working, which created it’s own line. Also the carry on bag fee at the airport was incredibly steep.

MCO
ATL
Okay 5.3

The poor way they handle things when the system goes down

AUS
IAD
Mediocre 2.0

2.5 hours delay is what I didn’t like

Sun, Dec 10
ONT
IAD
6h 46m
Fri, Dec 15
IAD
ONT
8h 11m
Trip: 6 days
5.6OkayShow reviews
Overall 5.6 Okay
Based on 33009 reviews
Overall
5.9
Boarding
6.4
Comfort
5.4
Crew
6.8
Entertainment
4.5
Food
4.7
MKE
LAS
Okay 5.6

The crew was most friendly and accommodating. Pilots very informative made a could be turbulent flight very smooth.

Seats are very uncomfortable had a bar straight across bottom of my back. Lack of food and beverages. The plane should always be stocked.

PHL
PBI
Good 6.3

The plane was clean and we left on time with no delays or issues. The flight crew were very nice and there was also enough overhead space for everyone’s bags.

The lines are excessively long to check a bag, there was only 1 of 4 check in kiosks working, which created it’s own line. Also the carry on bag fee at the airport was incredibly steep.

PVD
MCO
Mediocre 2.0

Seats are hard and uncomfortable. Very small drink tray and lights are not adjustable.

MSY
DEN
Excellent 8.0

Flight was delayed

MSP
DEN
Mediocre 2.0

We didn't make it to Vegas and they barely compensated us.

Sat, Apr 7
ONT
IAD
6h 50m
Mon, Apr 9
IAD
ONT
15h 55m
Trip: 3 days
5.6OkayShow reviews
Overall 5.6 Okay
Based on 33009 reviews
Overall
5.9
Boarding
6.4
Comfort
5.4
Crew
6.8
Entertainment
4.5
Food
4.7
PHX
CVG
Good 7.0

I liked that the staff was friendly and the tickets were affordable

I didn’t like that there was no complimentary food or beverage options.

MKE
LAS
Okay 5.6

The crew was most friendly and accommodating. Pilots very informative made a could be turbulent flight very smooth.

Seats are very uncomfortable had a bar straight across bottom of my back. Lack of food and beverages. The plane should always be stocked.

TPA
MKE
Good 6.3

The toilet was broken. Hour delay

MSP
DEN
Mediocre 2.0

We didn't make it to Vegas and they barely compensated us.

MCO
DEN
Good 6.0

It was cheap

Tue, May 22
ONT
IAD
17h 03m
Wed, May 30
IAD
ONT
15h 43m
Trip: 9 days
5.6OkayShow reviews
Overall 5.6 Okay
Based on 33009 reviews
Overall
5.9
Boarding
6.4
Comfort
5.4
Crew
6.8
Entertainment
4.5
Food
4.7
PHX
CVG
Good 7.0

I liked that the staff was friendly and the tickets were affordable

I didn’t like that there was no complimentary food or beverage options.

TPA
MKE
Good 6.3

The toilet was broken. Hour delay

MKE
LAS
Okay 5.6

The crew was most friendly and accommodating. Pilots very informative made a could be turbulent flight very smooth.

Seats are very uncomfortable had a bar straight across bottom of my back. Lack of food and beverages. The plane should always be stocked.

MCO
ATL
Okay 5.3

The poor way they handle things when the system goes down

DEN
ATL
Mediocre 2.0

I did not make the flight due to unclear announcements.

Wed, Feb 21
ONT
IAD
6h 50m
Mon, Feb 26
IAD
ONT
8h 11m
Trip: 6 days
5.6OkayShow reviews
Overall 5.6 Okay
Based on 33009 reviews
Overall
5.9
Boarding
6.4
Comfort
5.4
Crew
6.8
Entertainment
4.5
Food
4.7
PHL
PBI
Good 6.3

The plane was clean and we left on time with no delays or issues. The flight crew were very nice and there was also enough overhead space for everyone’s bags.

The lines are excessively long to check a bag, there was only 1 of 4 check in kiosks working, which created it’s own line. Also the carry on bag fee at the airport was incredibly steep.

MCO
DEN
Good 6.0

It was cheap

DEN
ATL
Mediocre 2.0

I did not make the flight due to unclear announcements.

PVD
MCO
Mediocre 2.0

Seats are hard and uncomfortable. Very small drink tray and lights are not adjustable.

MKE
LAS
Okay 5.6

The crew was most friendly and accommodating. Pilots very informative made a could be turbulent flight very smooth.

Seats are very uncomfortable had a bar straight across bottom of my back. Lack of food and beverages. The plane should always be stocked.

Tue, Jan 16
ONT
IAD
6h 46m
Fri, Jan 26
IAD
ONT
8h 11m
Trip: 11 days
5.6OkayShow reviews
Overall 5.6 Okay
Based on 33009 reviews
Overall
5.9
Boarding
6.4
Comfort
5.4
Crew
6.8
Entertainment
4.5
Food
4.7
MCO
ATL
Okay 5.3

The poor way they handle things when the system goes down

DEN
ATL
Mediocre 2.0

I did not make the flight due to unclear announcements.

MSP
DEN
Mediocre 2.0

We didn't make it to Vegas and they barely compensated us.

PVD
MCO
Mediocre 2.0

Seats are hard and uncomfortable. Very small drink tray and lights are not adjustable.

MCO
DEN
Good 6.0

It was cheap

Thu, May 3
ONT
IAD
17h 03m
Wed, May 9
IAD
ONT
15h 43m
Trip: 7 days
5.6OkayShow reviews
Overall 5.6 Okay
Based on 33009 reviews
Overall
5.9
Boarding
6.4
Comfort
5.4
Crew
6.8
Entertainment
4.5
Food
4.7
MSY
DEN
Excellent 8.0

Flight was delayed

PSP
DEN
Mediocre 3.3

My flight crew. Received call concerning my bag in Atlanta, although I was still in Denver.

Long line to check in, anxiety about missing flight Had to pay for my carry on Missed my connecting flight, announcements were not clear Was told I to pay a rebooking fee for a flight two days later Frontier does not offer stand by Spent $285 with another airline to get to Atlanta on time

MKE
LAS
Okay 5.6

The crew was most friendly and accommodating. Pilots very informative made a could be turbulent flight very smooth.

Seats are very uncomfortable had a bar straight across bottom of my back. Lack of food and beverages. The plane should always be stocked.

PHX
CVG
Good 7.0

I liked that the staff was friendly and the tickets were affordable

I didn’t like that there was no complimentary food or beverage options.

PVD
MCO
Mediocre 2.0

Seats are hard and uncomfortable. Very small drink tray and lights are not adjustable.

Tue, May 22
ONT
IAD
17h 03m
Fri, Jun 1
IAD
ONT
15h 43m
Trip: 11 days
5.6OkayShow reviews
Overall 5.6 Okay
Based on 33009 reviews
Overall
5.9
Boarding
6.4
Comfort
5.4
Crew
6.8
Entertainment
4.5
Food
4.7
PSP
DEN
Mediocre 3.3

My flight crew. Received call concerning my bag in Atlanta, although I was still in Denver.

Long line to check in, anxiety about missing flight Had to pay for my carry on Missed my connecting flight, announcements were not clear Was told I to pay a rebooking fee for a flight two days later Frontier does not offer stand by Spent $285 with another airline to get to Atlanta on time

MCO
ATL
Okay 5.3

The poor way they handle things when the system goes down

MSP
DEN
Mediocre 2.0

We didn't make it to Vegas and they barely compensated us.

MKE
LAS
Okay 5.6

The crew was most friendly and accommodating. Pilots very informative made a could be turbulent flight very smooth.

Seats are very uncomfortable had a bar straight across bottom of my back. Lack of food and beverages. The plane should always be stocked.

DEN
ATL
Mediocre 2.0

I did not make the flight due to unclear announcements.

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The fares displayed include all taxes and fees for economy class travel and were found by the provider in the last 72 hours. Seats are limited and may not be available on all flights and days. Fares are subject to change and may not be available on all flights or dates of travel. Some carriers charge additional fees for extra checked bags. Please check the carriers' sites.