Flights Ontario → San Francisco
As of November 2026, economy flights from Ontario to San Francisco have a typical range USD 189–755, median USD 409. Full range across all 175 offers: USD 117–2223. We analyzed 175 offers from 10 airlines in a single price check.
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: Ontario → San Francisco
Based on 175 offers · November 2026. Prices and availability change — run a live search to confirm.
Bag & seat fees: Ontario → San Francisco
Add-on pricing from the cheapest available offer per airline · November 2026 · USD
| Airline | Carry-on | Checked bag | Seat selection |
|---|---|---|---|
| Frontier Airlines | — | — | — |
| United | Included | USD 35 | — |
| United | — | USD 100 | — |
| Southwest | — | USD 90 | — |
| American Airlines | Included | USD 35 | — |
| Southwest Airlines | Included | Included | — |
| Alaska Airlines | Included | USD 35 | — |
| Delta | 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 Ontario to San Francisco cost?
Based on 175 offers · November 2026
Ontario to San Francisco flights ranged from USD 117 to USD 2223 across 175 offers analyzed in November 2026. The chart below shows how prices distributed across all 175 offers.
These 175 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 248 and USD 517
What hidden fees do Ontario to San Francisco flights charge?
Ancillary fees — bags, seat selection, and payment surcharges — can add 10–25% to the base fare on Ontario to San Francisco routes. The breakdown below is based on 175 offers analyzed in November 2026.
| Carrier | Avg fee (USD) | % of base fare |
|---|---|---|
| F9 | 10 | 3% |
| UA | 45 | 18% |
| United | 100 | 35% |
| Southwest | 90 | 24% |
| AA | 45 | 8% |
| WN | 0 | 0% |
| AS | 45 | 5% |
| DL | 45 | 3% |
United: base ~USD 201 + fees USD 100 = ~USD 301 total. American Airlines: base ~USD 559 + fees USD 45 = ~USD 604 total.
United's USD 100 ancillary fees narrow the gap with American Airlines's lower-fee model — the USD 358 base difference shrinks to USD 303 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.Fee levels vary significantly across carriers on this route — some carriers charge 50%+ above the base fare in ancillary fees.
Run your search to see itemized fees for your itineraryWhich airline is cheapest from Ontario to San Francisco?
10 airlines flew Ontario to San Francisco in this dataset. 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 130–238 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 | 31 | 130–238 | 189 | n/a |
 UA|F9 | 1 | — | 202 | n/a |
 United Airlines | 6 | — | 248 | 45 (18%) |
 Frontier Airlines | 27 | 195–775 | 261 | 10 (4%) |
 United | 6 | 257–306 | 301 | 100 (33%) |
 Southwest | 24 | 298–449 | 367 | 90 (25%) |
 Southwest Airlines | 48 | 409–585 | 467 | 0 (0%) |
 American Airlines | 18 | 416–692 | 604 | 45 (7%) |
 Alaska Airlines | 6 | 752–1365 | 809 | 45 (6%) |
 Delta Air Lines | 8 | 1513–2146 | 1623 | 45 (3%) |
Where do the best Ontario → San Francisco prices come from?
We checked direct airlines, travel agencies, and meta-search for this route. On this route the lowest median came from meta-search 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: Ontario to San Francisco flights
- Full-service carriers on Ontario–San Francisco cost 2.0x more than budget airlines (USD 631 vs USD 321 median; overall median USD 409).
- United charges 10.0x more in ancillary fees than F9 — USD 100 vs USD 10 avg per booking.
- The same route priced USD 265 apart depending on where it was booked — the lowest median was USD 202. 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 Ontario to San Francisco cost?
- Based on 175 offers analyzed, Ontario to San Francisco flights range from USD 117 to USD 2223, with a median price of USD 409. Search for your specific dates →
- What hidden fees should I expect on Ontario to San Francisco flights?
- On average, ancillary fees (bags, seat selection) add USD 33 to the base fare on Ontario to San Francisco flights. See itemized fees for your itinerary →
- Which airline is cheapest on Ontario to San Francisco including all fees?
- Frontier has the lowest median fare on Ontario to San Francisco at USD 189 (median across 31 offers in our snapshot). Check which airline wins on your dates →
- Which booking site has the cheapest Ontario–San Francisco 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 202. Run a live search and we'll find the cheapest for you →
- Why do prices vary so much on Ontario to San Francisco routes?
- Ontario to San Francisco has 10 airlines competing, creating a price range from USD 117 to USD 2223 across 175 offers. Prices on this route change with booking timing, advance purchase, and ancillary add-ons. Find where your trip lands in the distribution →
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