Washington to Ontario DCA, IAD → ONT
Ronald Reagan National Airport (DCA), Washington Dulles International Airport (IAD) → Ontario International Airport (ONT)
The cheapest return found recently is $289 with Frontier Airlines, 3 Nov – 10 Nov, found 3 days ago. The cheapest one-way found recently is $237 with American Airlines, 29 Dec, found 5 days ago.
Return
Not enough comparable prices yet for a usual return price.
Cheapest return found recently
$289
3 Nov – 10 Nov · Frontier Airlines
Ronald Reagan National Airport (DCA) → Ontario International Airport (ONT)
Leaves 6:00 p.m. · Return leaves 11:52 a.m. · 15 h 49 min of travel, both ways together
out 1 stop, back 1 stop
found 3 days ago
Cheapest nonstop return
None seen yet.
Found recently, and the cheapest we hold
$289 3 Nov – 10 Novfound 3 days agoSee prices for these dates
It is also the cheapest return we hold, of any age.
What have prices looked like?
Over 25 days, 24 Sept to 18 Oct, the cheapest return we saw each day was $190 to $491.
25 days is a short history, so treat this range as an early guide.
Those were the prices on those days, not today's.
Is this a good return price?
Not enough comparable prices yet: we hold return fares on 2 departure dates and need at least 3 to say what is usual.
Could nearby dates be cheaper?
We hold no other 7-night return fares leaving within 3 days of 3 Nov to compare.
Every date we hold
3 fares on 2 departure dates
See the chart as a table
| Dates | From | Airline | Airports | Stops | Found | |
|---|---|---|---|---|---|---|
| 31 Oct – 21 Nov | $394 | Frontier Airlines | Ronald Reagan National Airport (DCA) → Ontario International Airport (ONT) | out 1 stop, back 1 stop | found 3 days ago | See prices for these dates |
| 3 Nov – 10 Nov | $289 | Frontier Airlines | Ronald Reagan National Airport (DCA) → Ontario International Airport (ONT) | out 1 stop, back 1 stop | found 3 days ago | See prices for these dates |
Which month looks cheapest?
November 2026 is the cheapest month — from $289.
Airlines on the cheapest dates: Frontier Airlines.
One-way
The cheapest one-way fare on each of 3 departure dates is usually $179 to $266.
Cheapest one-way found recently
$237
29 Dec · American Airlines
Ronald Reagan National Airport (DCA) → Ontario International Airport (ONT)
Leaves 6:13 p.m. · 8 h 46 min trip
1 stop
found 5 days ago
Cheapest nonstop one-way
None seen yet.
Found recently, and the cheapest we hold
$237 29 Decfound 5 days agoOpen this trip
$120 7 Novfound 6 days agoOpen this trip
What have prices looked like?
Over 18 days, 1 Oct to 18 Oct, the cheapest one-way we saw each day was $86 to $294.
18 days is a short history, so treat this range as an early guide.
Those were the prices on those days, not today's.
Is this a good one-way price?
Compared with the cheapest one-way fare on each of 3 departure dates from 7 Nov to 29 Dec, found by travelers' searches in the last 7 days (economy, the price the seller showed on Aviasales). The usual range is the middle half of those prices.
Could nearby dates be cheaper?
No. We hold one-way fares on 1 other departure date within 3 days of 29 Dec, and it is not cheaper.
Every date we hold
3 fares on 3 departure dates
See the chart as a table
| Dates | From | Airline | Airports | Stops | Found | |
|---|---|---|---|---|---|---|
| 7 Nov | $120 | Frontier Airlines | Ronald Reagan National Airport (DCA) → Ontario International Airport (ONT) | 1 stop | found 6 days ago | Open this trip |
| 27 Dec | $294 | Frontier Airlines | Washington Dulles International Airport (IAD) → Ontario International Airport (ONT) | 1 stop | found 5 days ago | Open this trip |
| 29 Dec | $237 | American Airlines | Ronald Reagan National Airport (DCA) → Ontario International Airport (ONT) | 1 stop | found 5 days ago | Open this trip |
Which month looks cheapest?
November 2026 is the cheapest month — from $120.
Airlines on the cheapest dates: Frontier Airlines, American Airlines.
Premium cabin fares from Washington to Ontario
We hold no premium economy, business or first-class fares for this route: we collect them for the busiest routes, and this one is not among them yet.
Today's prices for 3 Nov – 10 Nov in another cabin: Premium economy · Business · First
Today's prices for 29 Dec in another cabin: Premium economy · Business · First
How far ahead were prices cheapest for Washington to Ontario?
Return
The cheapest fares were 14 to 29 days before departure.
From the cheapest return each day between 24 Sept and 18 Oct (25 days), grouped by how many days ahead the flight left; one adult in economy.
Each range covers different departure dates, so this compares typical fares, not the same trip priced twice.
Prices reflect recent searches — current fares may differ.
See these ranges as a table
| Booked ahead by | Typical fare | Cheapest day | Above the cheapest | Days of prices |
|---|---|---|---|---|
| 14–29 days | $247 | $243 | Cheapest seen | 8 |
| 30–59 days | $470 | $247 | +90% | 10 |
| 60–89 days | $491 | $491 | +99% | 8 |
One-way
The cheapest fares were 14 to 29 days before departure.
From the cheapest one-way each day between 1 Oct and 18 Oct (18 days), grouped by how many days ahead the flight left; one adult in economy.
Each range covers different departure dates, so this compares typical fares, not the same trip priced twice.
Prices reflect recent searches — current fares may differ.
See these ranges as a table
| Booked ahead by | Typical fare | Cheapest day | Above the cheapest | Days of prices |
|---|---|---|---|---|
| 14–29 days | $112 | $86 | Cheapest seen | 14 |
| 30–59 days | $126 | $86 | +13% | 9 |
| 60–89 days | $237 | $133 | +112% | 9 |
Could a nearby airport be cheaper?
A different airport at either end can change the fare — sometimes a lot.
Return
Washington → Los Angeles
56 km from Ontario
$294
$5 more than flying to Ontario
20 Nov – 25 Nov · DCA → LAX · out 1 stop, back 1 stop
found yesterday
Baltimore → Ontario
57 km from Washington
$452
$163 more than flying from Washington
21 Nov – 29 Nov · BWI → ONT · out 1 stop, back 1 stop
found 5 days ago
Cheapest recent price on each route — round trip, per traveler in Economy. Distances are in a straight line.
One-way
Washington → Los Angeles
56 km from Ontario
$189
$48 less than flying to Ontario
29 Mar 2027 · IAD → LAX · nonstop
found yesterday
Lancaster → Ontario
142 km from Washington
$463
$226 more than flying from Washington
28 Oct · LNS → ONT · 1 stop
found yesterday
Cheapest recent price on each route — one way, per traveler in Economy. Distances are in a straight line.
Live price for these dates
The cheapest return found recently is for 3 Nov – 10 Nov. A live search on this page shows what those dates cost now, for one adult in economy.
Prices are what travelers' searches on Aviasales found in the last 7 days, in US dollars: the price the seller showed on Aviasales; bags may cost extra. Fares change, so check today's price before you book. How our prices work