Flights Boston → Chicago
As of October 2026, economy flights from Boston to Chicago have a typical range USD 535–714, median USD 675. Full range across all 236 offers: USD 395–1446. We analyzed 236 offers from 4 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: Boston → Chicago
Based on 236 offers · October 2026. Prices and availability change — run a live search to confirm.
Bag & seat fees: Boston → Chicago
Add-on pricing from the cheapest available offer per airline · October 2026 · USD
| Airline | Carry-on | Checked bag | Seat selection |
|---|---|---|---|
| Southwest Airlines | Included | Included | — |
| Southwest | — | USD 90 | — |
| Delta Air Lines | 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 Boston to Chicago cost?
Based on 236 offers · October 2026
Boston to Chicago flights ranged from USD 395 to USD 1446 across 236 offers analyzed in October 2026. The chart below shows how prices distributed across all 236 offers.
These 236 offers (October 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 620 and USD 705
What hidden fees do Boston to Chicago flights charge?
Ancillary fees — bags, seat selection, and payment surcharges — can add 10–25% to the base fare on Boston to Chicago routes. The breakdown below is based on 236 offers analyzed in October 2026.
| Carrier | Avg fee (USD) | % of base fare |
|---|---|---|
| WN | 1 | 0% |
| Southwest | 90 | 14% |
| DL | 45 | 6% |
Delta Air Lines: base ~USD 596 + fees USD 45 = ~USD 641 total. Southwest Airlines: base ~USD 685 + fees USD 1 = ~USD 686 total.
Delta Air Lines's USD 45 ancillary fees narrow the gap with Southwest Airlines's lower-fee model — the USD 89 base difference shrinks to USD 45 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 Boston to Chicago?
4 airlines flew Boston to Chicago 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.
| Airline | Offers | Typical range (USD) | Median (USD) | Fees (USD) |
|---|---|---|---|---|
 Frontier | 1 | — | 395 | n/a |
 Delta Air Lines | 44 | 535–1105 | 641 | 45 (7%) |
 Southwest Airlines | 184 | 578–710 | 686 | 1 (0%) |
 Southwest | 7 | 516–715 | 715 | 90 (13%) |
Where do the best Boston → Chicago 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: Boston to Chicago flights
- Full-service carriers on Boston–Chicago cost 1.1x more than budget airlines (USD 641 vs USD 599 median; overall median USD 675).
- Southwest charges 92.0x more in ancillary fees than WN — USD 90 vs USD 1 avg per booking.
- The same route priced USD 181 apart depending on where it was booked — the lowest median was USD 535. 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 Boston to Chicago cost?
- Based on 236 offers analyzed, Boston to Chicago flights range from USD 395 to USD 1446, with a median price of USD 675. Search for your specific dates →
- What hidden fees should I expect on Boston to Chicago flights?
- On average, ancillary fees (bags, seat selection) add USD 12 to the base fare on Boston to Chicago flights. See itemized fees for your itinerary →
- Which airline is cheapest on Boston to Chicago including all fees?
- Frontier has the lowest median fare on Boston to Chicago at USD 395 (median across 1 offers in our snapshot). Check which airline wins on your dates →
- Which booking site has the cheapest Boston–Chicago 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 535. Run a live search and we'll find the cheapest for you →
- Why do prices vary so much on Boston to Chicago routes?
- Boston to Chicago has 4 airlines competing, creating a price range from USD 395 to USD 1446 across 236 offers. Prices on this route change with booking timing, advance purchase, and ancillary add-ons. Find where your trip lands in the distribution →
4 airlines compete on this route — we check every one
Find flights for my datesNew route — be among the first to track this itinerary
Building with flight data? Power your app or agent with LetsFG
The same multi-source search behind this page — every airline and the major booking sites, deduplicated and ranked — is available to your app or AI agent. Natural-language or structured queries, live prices, zero price bias.
Try the free sandbox — no card →Free sandbox, instant fake results · email for a key · Bearer-token auth · MCP, Python & JS SDKs · letsfg.co/developers