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

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Good to Know

Average Price:
$433
(avg. price over the last 2 weeks)
Good Deal:
$312
or less (round trip)

When to Book Flights from Washington Dulles Intl to Ontario

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 $312 or less.
The cheapest flight from Washington Dulles Intl to Ontario was found 47 days before departure, on average.
Book at least 3 weeks before departure in order to get a below-average price.
Morning departure is around 112% more expensive 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 Washington Dulles Intl to Ontario Flights

How long does a flight from Washington Dulles Intl to Ontario take?
An average nonstop flight takes 7h 40m, covering a distance of 2238 miles.
Which airlines provide the cheapest flights from Washington Dulles Intl to Ontario?
In the past 3 days, the cheapest round-trip tickets were found on Frontier ($179) and Multiple Airlines ($265)
Do I need a passport to fly between Washington Dulles Intl and Ontario?
No.
What’s the cheapest day of the week to fly Washington Dulles Intl to Ontario?
For Washington Dulles Intl to Ontario, Wednesday is the cheapest day to fly on average and Friday is the most expensive. Flying from Ontario back to Washington Dulles Intl, the best deals are generally found on Saturday, with Friday being the most expensive.

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

Airports
Origin
Washington
$179
only
$179
Destination
Ontario
$179
only
$179
Wed, May 2
IAD
ONT
15h 43m
Tue, May 8
ONT
IAD
17h 03m
Trip: 7 days
5.6OkayShow reviews
Overall 5.6 Okay
Based on 33532 reviews
Overall
5.9
Boarding
6.4
Comfort
5.4
Crew
6.8
Entertainment
4.5
Food
4.7
LAX
MCO
Okay 4.6

Very uncomfortable plane

MCO
OKC
Okay 4.3

Long lines

IAD
AUS
Mediocre 2.0

Lots of miscommunication and no help with assisting passengers off plane to rebook Austin to San Diego flight

ORD
TPA
Good 6.6

No frills but really good airfare. If traveling on a budget and can live without the basic frills it’s a great deal.

No in flight entertainment, seats don’t recline.

AUS
ONT
Okay 5.0

The fair was low and boarding was efficient.

The booking process was terrible online. There’s a charge for refreshments, the tray table is tiny, the staff didn’t seem happy, the seats don’t recline at all, they charge for carry ons, no outlet to charge my device.

Thu, Mar 1
IAD
ONT
8h 19m
Mon, Mar 5
ONT
IAD
6h 50m
Trip: 5 days
Overall 0.0 Poor
Based on 0 reviews
Sun, Jan 14
IAD
ONT
8h 05m
Tue, Jan 16
ONT
IAD
6h 46m
Trip: 3 days
5.6OkayShow reviews
Overall 5.6 Okay
Based on 33532 reviews
Overall
5.9
Boarding
6.4
Comfort
5.4
Crew
6.8
Entertainment
4.5
Food
4.7
CVG
RSW
Okay 4.3

The seats don't move so very uncomfortable to try and relax. No free beverages. Bag fees are riduculous.

SAT
IAD
Excellent 8.3

Whole flight boarding process is quick.

SFO
MCO
Okay 4.6

On time

Told to get there 3 hours before,checkin opened 2 hours before. Plane was clean,and fairly new, seat most uncomfortable,limited leg room. Total fare plus $150 for luggage , NOT a budget price. First and last time user.

IAD
AUS
Mediocre 2.0

Lots of miscommunication and no help with assisting passengers off plane to rebook Austin to San Diego flight

MCO
OKC
Okay 4.3

Long lines

Thu, Jan 18
IAD
ONT
8h 05m
Sun, Jan 21
ONT
IAD
6h 46m
Trip: 4 days
5.6OkayShow reviews
Overall 5.6 Okay
Based on 33532 reviews
Overall
5.9
Boarding
6.4
Comfort
5.4
Crew
6.8
Entertainment
4.5
Food
4.7
AUS
ONT
Okay 5.0

The fair was low and boarding was efficient.

The booking process was terrible online. There’s a charge for refreshments, the tray table is tiny, the staff didn’t seem happy, the seats don’t recline at all, they charge for carry ons, no outlet to charge my device.

CVG
RSW
Okay 4.3

The seats don't move so very uncomfortable to try and relax. No free beverages. Bag fees are riduculous.

ORD
TPA
Good 6.6

No frills but really good airfare. If traveling on a budget and can live without the basic frills it’s a great deal.

No in flight entertainment, seats don’t recline.

MCO
OKC
Okay 4.3

Long lines

SFO
MCO
Okay 4.6

On time

Told to get there 3 hours before,checkin opened 2 hours before. Plane was clean,and fairly new, seat most uncomfortable,limited leg room. Total fare plus $150 for luggage , NOT a budget price. First and last time user.

Fri, Jan 19
IAD
ONT
8h 11m
Sun, Jan 21
ONT
IAD
6h 46m
Trip: 3 days
5.6OkayShow reviews
Overall 5.6 Okay
Based on 33532 reviews
Overall
5.9
Boarding
6.4
Comfort
5.4
Crew
6.8
Entertainment
4.5
Food
4.7
IAD
AUS
Mediocre 2.0

Lots of miscommunication and no help with assisting passengers off plane to rebook Austin to San Diego flight

MCO
SFO
Okay 5.6

Flight wasn’t bad for what I paid for. One MUST definitely do his/her homework before flying to be prepared for all of the extra costs, etc... I was glad I did and was prepared with my own food, neck pillow, etc. I didn’t expect much in terms of creature comforts and therefore wasn’t disappointed. There isn’t much space in the cabin, so I was glad to have my 6-year old in between us 2 adults. Crew was pleasant r and professional. Ticket agent was helpful if a bit “assertive”. I probably won’t try to book them for long flights, but for short flights their fine

The tiny space and small seats!

ORD
TPA
Good 6.6

No frills but really good airfare. If traveling on a budget and can live without the basic frills it’s a great deal.

No in flight entertainment, seats don’t recline.

CLT
MCO
Excellent 10.0

Friendliness of staff

No water passed out

SAT
IAD
Excellent 8.3

Whole flight boarding process is quick.

Tue, Jan 30
IAD
ONT
8h 05m
Wed, Jan 31
ONT
IAD
6h 50m
Trip: 2 days
5.6OkayShow reviews
Overall 5.6 Okay
Based on 33532 reviews
Overall
5.9
Boarding
6.4
Comfort
5.4
Crew
6.8
Entertainment
4.5
Food
4.7
AUS
PHX
Excellent 10.0

Everything

Nothing

AUS
ONT
Okay 5.0

The fair was low and boarding was efficient.

The booking process was terrible online. There’s a charge for refreshments, the tray table is tiny, the staff didn’t seem happy, the seats don’t recline at all, they charge for carry ons, no outlet to charge my device.

SFO
MCO
Okay 4.6

On time

Told to get there 3 hours before,checkin opened 2 hours before. Plane was clean,and fairly new, seat most uncomfortable,limited leg room. Total fare plus $150 for luggage , NOT a budget price. First and last time user.

SAT
IAD
Excellent 8.3

Whole flight boarding process is quick.

LAX
MCO
Okay 4.6

Very uncomfortable plane

Thu, Feb 1
IAD
ONT
8h 05m
Tue, Feb 6
ONT
IAD
6h 41m
Trip: 6 days
5.6OkayShow reviews
Overall 5.6 Okay
Based on 33532 reviews
Overall
5.9
Boarding
6.4
Comfort
5.4
Crew
6.8
Entertainment
4.5
Food
4.7
SFO
MCO
Okay 4.6

On time

Told to get there 3 hours before,checkin opened 2 hours before. Plane was clean,and fairly new, seat most uncomfortable,limited leg room. Total fare plus $150 for luggage , NOT a budget price. First and last time user.

AUS
ONT
Okay 5.0

The fair was low and boarding was efficient.

The booking process was terrible online. There’s a charge for refreshments, the tray table is tiny, the staff didn’t seem happy, the seats don’t recline at all, they charge for carry ons, no outlet to charge my device.

DEN
ATL
Mediocre 3.0

I FINALLY arrived at my destination.

Huge delay, no explanation. Cabin filthy.

MCO
SFO
Okay 5.6

Flight wasn’t bad for what I paid for. One MUST definitely do his/her homework before flying to be prepared for all of the extra costs, etc... I was glad I did and was prepared with my own food, neck pillow, etc. I didn’t expect much in terms of creature comforts and therefore wasn’t disappointed. There isn’t much space in the cabin, so I was glad to have my 6-year old in between us 2 adults. Crew was pleasant r and professional. Ticket agent was helpful if a bit “assertive”. I probably won’t try to book them for long flights, but for short flights their fine

The tiny space and small seats!

IAD
AUS
Mediocre 2.0

Lots of miscommunication and no help with assisting passengers off plane to rebook Austin to San Diego flight

Tue, Apr 10
IAD
ONT
9h 05m
Wed, Apr 11
ONT
IAD
7h 30m
Trip: 2 days
Overall 0.0 Poor
Based on 0 reviews
Fri, Feb 2
IAD
ONT
8h 11m
Mon, Feb 5
ONT
IAD
6h 50m
Trip: 4 days
5.6OkayShow reviews
Overall 5.6 Okay
Based on 33532 reviews
Overall
5.9
Boarding
6.4
Comfort
5.4
Crew
6.8
Entertainment
4.5
Food
4.7
LAX
MCO
Okay 4.6

Very uncomfortable plane

CLT
MCO
Excellent 10.0

Friendliness of staff

No water passed out

ORD
TPA
Good 6.6

No frills but really good airfare. If traveling on a budget and can live without the basic frills it’s a great deal.

No in flight entertainment, seats don’t recline.

SFO
MCO
Okay 4.6

On time

Told to get there 3 hours before,checkin opened 2 hours before. Plane was clean,and fairly new, seat most uncomfortable,limited leg room. Total fare plus $150 for luggage , NOT a budget price. First and last time user.

AUS
PHX
Excellent 10.0

Everything

Nothing

Mon, Jan 22
IAD
ONT
8h 11m
Thu, Jan 25
ONT
IAD
9h 26m
Trip: 4 days
Overall 0.0 Poor
Based on 0 reviews
Thu, Feb 22
IAD
ONT
7h 54m
Mon, Feb 26
ONT
IAD
6h 50m
Trip: 5 days
5.6OkayShow reviews
Overall 5.6 Okay
Based on 33532 reviews
Overall
5.9
Boarding
6.4
Comfort
5.4
Crew
6.8
Entertainment
4.5
Food
4.7
AUS
PHX
Excellent 10.0

Everything

Nothing

SAT
IAD
Excellent 8.3

Whole flight boarding process is quick.

AUS
ONT
Okay 5.0

The fair was low and boarding was efficient.

The booking process was terrible online. There’s a charge for refreshments, the tray table is tiny, the staff didn’t seem happy, the seats don’t recline at all, they charge for carry ons, no outlet to charge my device.

DEN
ATL
Mediocre 3.0

I FINALLY arrived at my destination.

Huge delay, no explanation. Cabin filthy.

SFO
MCO
Okay 4.6

On time

Told to get there 3 hours before,checkin opened 2 hours before. Plane was clean,and fairly new, seat most uncomfortable,limited leg room. Total fare plus $150 for luggage , NOT a budget price. First and last time user.

Fri, Mar 2
IAD
ONT
7h 40m
Sat, Mar 3
ONT
IAD
6h 50m
Trip: 2 days
5.6OkayShow reviews
Overall 5.6 Okay
Based on 33532 reviews
Overall
5.9
Boarding
6.4
Comfort
5.4
Crew
6.8
Entertainment
4.5
Food
4.7
MCO
OKC
Okay 4.3

Long lines

CVG
RSW
Okay 4.3

The seats don't move so very uncomfortable to try and relax. No free beverages. Bag fees are riduculous.

AUS
ONT
Okay 5.0

The fair was low and boarding was efficient.

The booking process was terrible online. There’s a charge for refreshments, the tray table is tiny, the staff didn’t seem happy, the seats don’t recline at all, they charge for carry ons, no outlet to charge my device.

SFO
MCO
Okay 4.6

On time

Told to get there 3 hours before,checkin opened 2 hours before. Plane was clean,and fairly new, seat most uncomfortable,limited leg room. Total fare plus $150 for luggage , NOT a budget price. First and last time user.

ORD
TPA
Good 6.6

No frills but really good airfare. If traveling on a budget and can live without the basic frills it’s a great deal.

No in flight entertainment, seats don’t recline.

Wed, Apr 4
IAD
ONT
7h 40m
Wed, Apr 11
ONT
IAD
7h 30m
Trip: 8 days
5.6OkayShow reviews
Overall 5.6 Okay
Based on 33532 reviews
Overall
5.9
Boarding
6.4
Comfort
5.4
Crew
6.8
Entertainment
4.5
Food
4.7
SAT
IAD
Excellent 8.3

Whole flight boarding process is quick.

MCO
SFO
Okay 5.6

Flight wasn’t bad for what I paid for. One MUST definitely do his/her homework before flying to be prepared for all of the extra costs, etc... I was glad I did and was prepared with my own food, neck pillow, etc. I didn’t expect much in terms of creature comforts and therefore wasn’t disappointed. There isn’t much space in the cabin, so I was glad to have my 6-year old in between us 2 adults. Crew was pleasant r and professional. Ticket agent was helpful if a bit “assertive”. I probably won’t try to book them for long flights, but for short flights their fine

The tiny space and small seats!

SFO
MCO
Okay 4.6

On time

Told to get there 3 hours before,checkin opened 2 hours before. Plane was clean,and fairly new, seat most uncomfortable,limited leg room. Total fare plus $150 for luggage , NOT a budget price. First and last time user.

CVG
RSW
Okay 4.3

The seats don't move so very uncomfortable to try and relax. No free beverages. Bag fees are riduculous.

AUS
PHX
Excellent 10.0

Everything

Nothing

Wed, Jun 6
IAD
ONT
15h 43m
Tue, Jun 12
ONT
IAD
17h 03m
Trip: 7 days
5.6OkayShow reviews
Overall 5.6 Okay
Based on 33532 reviews
Overall
5.9
Boarding
6.4
Comfort
5.4
Crew
6.8
Entertainment
4.5
Food
4.7
LAX
MCO
Okay 4.6

Very uncomfortable plane

MCO
SFO
Okay 5.6

Flight wasn’t bad for what I paid for. One MUST definitely do his/her homework before flying to be prepared for all of the extra costs, etc... I was glad I did and was prepared with my own food, neck pillow, etc. I didn’t expect much in terms of creature comforts and therefore wasn’t disappointed. There isn’t much space in the cabin, so I was glad to have my 6-year old in between us 2 adults. Crew was pleasant r and professional. Ticket agent was helpful if a bit “assertive”. I probably won’t try to book them for long flights, but for short flights their fine

The tiny space and small seats!

ORD
TPA
Good 6.6

No frills but really good airfare. If traveling on a budget and can live without the basic frills it’s a great deal.

No in flight entertainment, seats don’t recline.

AUS
ONT
Okay 5.0

The fair was low and boarding was efficient.

The booking process was terrible online. There’s a charge for refreshments, the tray table is tiny, the staff didn’t seem happy, the seats don’t recline at all, they charge for carry ons, no outlet to charge my device.

CLT
MCO
Excellent 10.0

Friendliness of staff

No water passed out

Wed, May 2
IAD
ONT
15h 43m
Sun, May 6
ONT
IAD
17h 03m
Trip: 5 days
5.6OkayShow reviews
Overall 5.6 Okay
Based on 33532 reviews
Overall
5.9
Boarding
6.4
Comfort
5.4
Crew
6.8
Entertainment
4.5
Food
4.7
MCO
SFO
Okay 5.6

Flight wasn’t bad for what I paid for. One MUST definitely do his/her homework before flying to be prepared for all of the extra costs, etc... I was glad I did and was prepared with my own food, neck pillow, etc. I didn’t expect much in terms of creature comforts and therefore wasn’t disappointed. There isn’t much space in the cabin, so I was glad to have my 6-year old in between us 2 adults. Crew was pleasant r and professional. Ticket agent was helpful if a bit “assertive”. I probably won’t try to book them for long flights, but for short flights their fine

The tiny space and small seats!

CLT
MCO
Excellent 10.0

Friendliness of staff

No water passed out

AUS
PHX
Excellent 10.0

Everything

Nothing

SAT
IAD
Excellent 8.3

Whole flight boarding process is quick.

MCO
OKC
Okay 4.3

Long lines

Tue, Mar 27
IAD
ONT
7h 48m
Wed, Apr 4
ONT
IAD
6h 50m
Trip: 9 days
5.6OkayShow reviews
Overall 5.6 Okay
Based on 33532 reviews
Overall
5.9
Boarding
6.4
Comfort
5.4
Crew
6.8
Entertainment
4.5
Food
4.7
SFO
MCO
Okay 4.6

On time

Told to get there 3 hours before,checkin opened 2 hours before. Plane was clean,and fairly new, seat most uncomfortable,limited leg room. Total fare plus $150 for luggage , NOT a budget price. First and last time user.

SAT
IAD
Excellent 8.3

Whole flight boarding process is quick.

MCO
OKC
Okay 4.3

Long lines

CLT
MCO
Excellent 10.0

Friendliness of staff

No water passed out

DEN
ATL
Mediocre 3.0

I FINALLY arrived at my destination.

Huge delay, no explanation. Cabin filthy.

Wed, Apr 4
IAD
ONT
7h 40m
Tue, Apr 10
ONT
IAD
17h 02m
Trip: 7 days
5.6OkayShow reviews
Overall 5.6 Okay
Based on 33532 reviews
Overall
5.9
Boarding
6.4
Comfort
5.4
Crew
6.8
Entertainment
4.5
Food
4.7
IAD
AUS
Mediocre 2.0

Lots of miscommunication and no help with assisting passengers off plane to rebook Austin to San Diego flight

CVG
RSW
Okay 4.3

The seats don't move so very uncomfortable to try and relax. No free beverages. Bag fees are riduculous.

LAX
MCO
Okay 4.6

Very uncomfortable plane

DEN
ATL
Mediocre 3.0

I FINALLY arrived at my destination.

Huge delay, no explanation. Cabin filthy.

AUS
ONT
Okay 5.0

The fair was low and boarding was efficient.

The booking process was terrible online. There’s a charge for refreshments, the tray table is tiny, the staff didn’t seem happy, the seats don’t recline at all, they charge for carry ons, no outlet to charge my device.

Sat, Feb 17
IAD
ONT
8h 11m
Wed, Feb 21
ONT
IAD
6h 50m
Trip: 5 days
5.6OkayShow reviews
Overall 5.6 Okay
Based on 33532 reviews
Overall
5.9
Boarding
6.4
Comfort
5.4
Crew
6.8
Entertainment
4.5
Food
4.7
MCO
SFO
Okay 5.6

Flight wasn’t bad for what I paid for. One MUST definitely do his/her homework before flying to be prepared for all of the extra costs, etc... I was glad I did and was prepared with my own food, neck pillow, etc. I didn’t expect much in terms of creature comforts and therefore wasn’t disappointed. There isn’t much space in the cabin, so I was glad to have my 6-year old in between us 2 adults. Crew was pleasant r and professional. Ticket agent was helpful if a bit “assertive”. I probably won’t try to book them for long flights, but for short flights their fine

The tiny space and small seats!

DEN
ATL
Mediocre 3.0

I FINALLY arrived at my destination.

Huge delay, no explanation. Cabin filthy.

IAD
AUS
Mediocre 2.0

Lots of miscommunication and no help with assisting passengers off plane to rebook Austin to San Diego flight

AUS
ONT
Okay 5.0

The fair was low and boarding was efficient.

The booking process was terrible online. There’s a charge for refreshments, the tray table is tiny, the staff didn’t seem happy, the seats don’t recline at all, they charge for carry ons, no outlet to charge my device.

ORD
TPA
Good 6.6

No frills but really good airfare. If traveling on a budget and can live without the basic frills it’s a great deal.

No in flight entertainment, seats don’t recline.

Tue, Apr 3
IAD
ONT
7h 48m
Fri, Apr 6
ONT
IAD
6h 50m
Trip: 4 days
5.6OkayShow reviews
Overall 5.6 Okay
Based on 33532 reviews
Overall
5.9
Boarding
6.4
Comfort
5.4
Crew
6.8
Entertainment
4.5
Food
4.7
SAT
IAD
Excellent 8.3

Whole flight boarding process is quick.

CVG
RSW
Okay 4.3

The seats don't move so very uncomfortable to try and relax. No free beverages. Bag fees are riduculous.

AUS
ONT
Okay 5.0

The fair was low and boarding was efficient.

The booking process was terrible online. There’s a charge for refreshments, the tray table is tiny, the staff didn’t seem happy, the seats don’t recline at all, they charge for carry ons, no outlet to charge my device.

DEN
ATL
Mediocre 3.0

I FINALLY arrived at my destination.

Huge delay, no explanation. Cabin filthy.

AUS
PHX
Excellent 10.0

Everything

Nothing

Fri, May 4
IAD
ONT
15h 43m
Tue, May 8
ONT
IAD
17h 03m
Trip: 5 days
5.6OkayShow reviews
Overall 5.6 Okay
Based on 33532 reviews
Overall
5.9
Boarding
6.4
Comfort
5.4
Crew
6.8
Entertainment
4.5
Food
4.7
SAT
IAD
Excellent 8.3

Whole flight boarding process is quick.

LAX
MCO
Okay 4.6

Very uncomfortable plane

MCO
OKC
Okay 4.3

Long lines

AUS
PHX
Excellent 10.0

Everything

Nothing

ORD
TPA
Good 6.6

No frills but really good airfare. If traveling on a budget and can live without the basic frills it’s a great deal.

No in flight entertainment, seats don’t recline.

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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.

Washington Dulles Intl to Ontario Flight Information

Flights Arrive in Ontario
Flights Depart from Washington Dulles Intl
Flight Price $179
Distance 2238 miles
Airlines Frontier