Flights Washington DC → Ontario
As of November 2026, economy flights from Washington DC to Ontario have a typical range USD 308–857, median USD 329. Full range across all 131 offers: USD 209–2537. We found 31% of 131 offers from budget carriers (around USD 314) and 69% from full-service carriers (around USD 329).
Preview snapshot — prices change. Search for live results.
Data collected by LetsFG's multi-source price checks — every airline and the major booking sites checked for this route. How we collect data →
Best offers by airline: Washington DC → Ontario
Based on 131 offers · November 2026. Prices and availability change — run a live search to confirm.
Bag & seat fees: Washington DC → Ontario
Add-on pricing from the cheapest available offer per airline · November 2026 · USD
| Airline | Carry-on | Checked bag | Seat selection |
|---|---|---|---|
| United | Included | USD 35 | — |
| Southwest Airlines | Included | Included | — |
| Delta | Included | USD 35 | — |
| Alaska | — | USD 45 | — |
| United | — | USD 50 | — |
| Southwest | — | USD 45 | — |
| American Airlines | Included | USD 35 | — |
| American | — | USD 55 | — |
| Alaska Airlines | Included | USD 35 | — |
Fees are estimates from the prices we checked and may not reflect your specific itinerary, booking class, or payment method. Run a live search for exact pricing.
How much do flights from Washington DC to Ontario cost?
Based on 131 offers · November 2026
Washington DC to Ontario flights ranged from USD 209 to USD 2537 across 131 offers analyzed in November 2026. Two fare clusters detected: budget fares around 325 and premium fares around 791 The chart below shows how prices distributed across all 131 offers.
These 131 offers (November 2026) span multiple departure dates and booking windows — your travel dates may fall anywhere in this distribution. Only a live search shows where your specific trip lands.
50% of offers priced between USD 314 and USD 688
What hidden fees do Washington DC to Ontario flights charge?
Ancillary fees — bags, seat selection, and payment surcharges — can add 10–25% to the base fare on Washington DC to Ontario routes. The breakdown below is based on 131 offers analyzed in November 2026.
| Carrier | Avg fee (USD) | % of base fare |
|---|---|---|
| UA | 45 | 14% |
| WN | 18 | 5% |
| DL | 45 | 6% |
| Alaska | 45 | 14% |
| United | 50 | 16% |
| Southwest | 45 | 14% |
| AA | 45 | 9% |
| American | 55 | 17% |
| AS | 45 | 6% |
American: base ~USD 274 + fees USD 55 = ~USD 329 total. Southwest Airlines: base ~USD 312 + fees USD 18 = ~USD 330 total.
American's USD 55 ancillary fees narrow the gap with Southwest Airlines's lower-fee model — the USD 38 base difference shrinks to USD 1 after fees. Always compare total cost, not just the advertised base fare.
Estimates based on median total minus average ancillary fee. Actual base fares vary by itinerary.American charges 3.1x more in ancillary fees than WN on this route. Compare total-cost options when booking.
Run your search to see itemized fees for your itineraryWhich airline is cheapest from Washington DC to Ontario?
10 airlines flew Washington DC to Ontario in this dataset. The route shows a clear split between low-cost and full-service carriers. Knowing the airline isn't enough — the typical fare range below shows how far prices swing on each one. Median and range include all fees we recorded.
Even on the cheapest airline (Frontier), fares ranged USD 211–253 in this snapshot. Your exact price depends on your dates and how far ahead you book — run a live search to see your number →
| Airline | Offers | Typical range (USD) | Median (USD) | Fees (USD) |
|---|---|---|---|---|
 Frontier | 5 | 211–253 | 215 | n/a |
 United Airlines | 20 | 308–328 | 308 | 45 (15%) |
 Alaska | 3 | 309–325 | 309 | 45 (15%) |
 United | 3 | 309–325 | 309 | 50 (16%) |
 Southwest | 10 | 314–329 | 314 | 45 (14%) |
 American | 1 | — | 329 | 55 (17%) |
 Southwest Airlines | 20 | 327–386 | 330 | 18 (5%) |
 American Airlines | 23 | 328–900 | 392 | 45 (11%) |
 Delta Air Lines | 39 | 308–1359 | 688 | 45 (7%) |
 Alaska Airlines | 7 | 501–907 | 857 | 45 (5%) |
Where do the best Washington DC → Ontario prices come from?
We checked direct airlines, travel agencies, and meta-search for this route. On this route the lowest median came from travel agency sources, but the cheapest channel shifts by route and date — which is exactly why a live search across all of them wins.
We compare every airline and the major booking sites but never disclose which — that's our edge. Prices are the ones we observed and aren't official data from any platform. Run a live search and we bring you the cheapest, wherever it is.
Key facts: Washington DC to Ontario flights
- Full-service carriers on Washington DC–Ontario cost 1.6x more than budget airlines (USD 456 vs USD 286 median; overall median USD 329).
- American charges 3.1x more in ancillary fees than WN — USD 55 vs USD 18 avg per booking.
- The same route priced USD 78 apart depending on where it was booked — the lowest median was USD 314. We search every airline and the major booking sites at once so you always see that lowest price.
Frequently asked questions
- How much does a flight from Washington DC to Ontario cost?
- Based on 131 offers analyzed, Washington DC to Ontario flights range from USD 209 to USD 2537, with a median price of USD 329. Search for your specific dates →
- What hidden fees should I expect on Washington DC to Ontario flights?
- On average, ancillary fees (bags, seat selection) add USD 41 to the base fare on Washington DC to Ontario flights. See itemized fees for your itinerary →
- Which airline is cheapest on Washington DC to Ontario including all fees?
- Frontier has the lowest median fare on Washington DC to Ontario at USD 215 (median across 5 offers in our snapshot). Check which airline wins on your dates →
- Which booking site has the cheapest Washington DC–Ontario flights?
- It depends on your dates — no single site is always cheapest. We search every airline and the major booking sites at once (travel agencies and meta-search included) and surface whichever is lowest; the best median in this snapshot was USD 314. Run a live search and we'll find the cheapest for you →
- Why do prices vary so much on Washington DC to Ontario routes?
- Washington DC to Ontario has 10 airlines competing, creating a price range from USD 209 to USD 2537 across 131 offers. There are two distinct fare clusters on this route: budget options and premium fares. Find where your trip lands in the distribution →
10 airlines, two price clusters — find which fits your budget
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